DUAL STAGE SYNTHETIC MEDIA BIOLOGICAL ODOR CONTROL (BIOFILTER) SYSTEM

PART 1 GENERAL

1.01 GENERAL

A. This document covers the furnishing and delivery of materials, equipment, and appurtenances for a biological odor control system.

B. Like items of equipment specified hereunder shall be the end product of one manufacturer in order to achieve standardization for operation, maintenance, spare parts, and manufacturer’s services.

C. The supplier shall provide a complete two-stage biotower/biofiltration odor control system consisting of biotower and biofilter media to be housed in a concrete vessel, irrigation systems, recirculation systems, nutrient feed systems, instrumentation, fluid control (water panels), motor starters and control panel, as specified herein to properly operate and monitor the biofilter system. Application software, programmable logic controller (PLC) and operator interface unit (OI) programming, will be provided under Section , Instrumentation and Control for Process Systems.

1.02 DEFINITIONS A. H2S: Hydrogen sulfide.

B. FRP: Fiberglass reinforced plastic. C. HDPE: High density polyethylene. D. OU: Odor Units. E. EBRT: Empty Bed Residence Time. F. D/T: Dilutions to threshold.

G. AFD: Adjustable frequency drive.

A. A single biofilter system manufacturer shall have sole-source responsibility for the design, testing, performance and installation of the system and shall provide all components of the biofilter odor control system as indicated. Such supplier shall henceforth be referred to as the Biofilter System Supplier or Manufacturer.

B. The Biofilter System Supplier must be able to provide the Owner with training and monitoring support service during the first year of operation.

C. The Biofilter System Supplier shall provide project management, support, integration, and startup personnel.

D. Approved Biofilter System Suppliers:

1. BIOREM Technologies, Inc. 2. Enduro, Environmental Products (formerly Bay Products). 3. No or equal allowed.

1.04 WORK INCLUDED

A. Manufacturer shall supply the essential biofilter system components, submittals and services listed below.

1. Biotower recirculation pumps, valves, and internal humidification spray system with piping and nozzles as indicated on Drawings.

2. Nutrient feed systems including tanks, mixers, and metering pumps as indicated on Drawings.

3. 1-year supply of nutrient dry blend. 

4. First stage biotower and second stage biofilter media. 

5. Biofilter media surface irrigation systems and piping as indicated on

Drawings. 

6. FRP grating and mesh screen media support system for the biotower

media. 

7. HDPE media support system (BacTee or approved equal) and mesh

screen for the biofilter media. 

8. Equipment, instrumentation, controls, and panels as specified to

properly operate and monitor the biotower and biofiltration systems. 

9. A 1-year media monitoring and service support package. 

10. A 10-year media life and performance guarantee.

B. The items listed below are to be supplied by the Subcontractor and are not in the manufacturer’s Scope of Supply.

1.05

1. FRP odorous air fans per Section 23 34 00, HVAC Fans. 2. Adjustable frequency drive for each fan provided in accordance with

Section 26 29 23, Low-Voltage Variable Frequency Drive System. Control, monitoring and communication for each fan and VFD integrated under this Section.

3. All odorous air ductwork including dampers, transition pieces, fittings, flanges, through-holes and necessary supports.

4. Onsite temporary storage of biotower and biofilter media. 5. Installation and assembly of all equipment and instrumentation

components required for a complete system including labor, equipment and materials. Equipment installation to include fans, recirculation pumps, water panel, control panel, ductwork and all associated instrumentation.

6. Concrete biotower/biofilter basins including rebar, foundation, sloped concrete flooring, odorous air plenums, corrosion protection coatings, sump and all details as per Contract Drawings.

7. Install biotower media support system and media supplied by biofilter manufacturer.

8. Install biofilter media support system and media as supplied by biofilter manufacturer.

9. Install biotower internal humidification spray system per manufacturer’s instructions.

10. Install biofilter media surface irrigation system per manufacturer’s instructions.

11. Site preparation and clearing of materials. 

12. Supply and install all external water piping and drain piping to and from

the biotower/biofilter equipment including heat tracing as indicted on Drawings, insulation, piping supports, drainage traps and sump pumps. This includes all piping up to the water panel and all drains from the biotower, biofilter, and all piping between the water panel and the biotower/biofilter system.

13. Supply and install all piping and duct supports. 

14. Utility requirements including main electrical service and all system

field wiring outside the main biotower/biofilter control panel.

STANDARD PERFORMANCE GUARANTEE

A. Biofilter System Supplier shall guarantee that the biofilter system provides consistent odor and H2S in accordance with the specified removal efficiencies on a continuous basis for a period of 10 years from the date of substantial completion. This performance guarantee is valid only if the biofilter is operated and maintained in accordance with the design criteria and service conditions detailed in this Section, Part 2, and the manufacturer’s operation and maintenance manuals. If the biofilter does not meet performance standards at any time within the guarantee period, the biofilter system shall be modified by the Biofilter System Supplier to meet the specified removal efficiencies.

B. It is the responsibility of the Owner to maintain records of these parameters in accordance with the instructions provided in the manufacturer's operation and maintenance manuals, Manufacturers’ Services.

1.06 SUBMITT ALS

A. Furnish complete fabrication, assembly, and installation drawings, together with electrical and instrumentation details and drawings shall be submitted for review.

B. General: Provide Shop Drawings, samples, administrative, quality control, and contract closeout submittals in accordance with the requirements of Section 01 33 00, Submittal Procedures; Section 01 78 23, Operation and Maintenance Data; Section 01 91 14, Equipment Testing and Facility Startup; Section 01 43 33, Manufacturers’ Field Services, and as listed below.

C. Provide Shop Drawings and Samples as follows:

1. Detailed structural and mechanical layout drawings showing system fabrication, dimensions, size and locations of connections to other work, concrete penetrations, equipment mounting details, and fully describing the media humidification and surface irrigation system.

2. Manufacturer’s catalog information, descriptive literature, specifications, and identification of materials of construction.

3. Provide process calculations showing that the media(s) as provided will meet the required performance criteria.

4. Manufacturer’s Information on the Biotower and Biofilter Media: a. Pressure drop data through media(s). b. Biofiltration Media Physical Characteristics, Including:

1) 2) 3)

Media Volume. Media Depth. Required Empty Bed Residence Time to meet specified Odor Removal performance.

c. Information on expected settling rates of the media per year. d. Operating data from previous installations to substantiate media

performance claims. 5. Submittal package shall comply with Specification and include

appropriate literature, illustrations, process and instrumentation diagrams, layout drawings, wiring diagrams, and engineering data.

D. Provide Action and Informational Submittals as defined in Section 40 99 90, Package Control Systems.

E. Performance Test Submittals:

1. Submit a Detailed Performance Testing Plan a minimum of 30 days prior to testing which Includes:

a. b. c. d.

Test equipment and apparatus. Calibration and setup procedures. The specific testing methodology to be used. The sampling and analysis procedures.

2. Submit a final report that provides a narrative of the sampling activities, a copy of the original sampling log, photographs showing locations of velocity and pressure measurements, tabular summary of velocity, pressure, H2S and Odor removal data, calculated results, and conclusions of these results.

3. Revise the report according to CH2M HILL’s written comments, and resubmit.

F. Provide Quality Control Submittals as follows:

1. Operations and Maintenance Manual. 2. Manufacturer’s Certification of Compliance that the factory finish

system is identical to the requirements specified herein. 3. Manufacturer’ s Certificate of Proper Installation. 4. Manufacturer’s Training Program. 5. Equipment Testing and Field Startup Report.

1.07 PRODUCT DELIVERY, STORAGE, AND HANDLING

A. Product delivery, storage, and handling shall comply with Section 01 61 00, Common Product Requirements, manufacturer’s instructions, and as follows:

1. Long-term media storage is not allowed. Long-term storage is defined as storage of media for a period greater than 2 months.

2. Store media on clean, level surface. Avoid cross-contamination of foreign materials during handling and placement. Cover media with a tarp if stored longer than 1 week.

3. Store electrical and ancillary equipment in climate controlled building greater than 50 degrees F.

1.08 COORDINATION

A. The biofilter manufacturer shall conduct site visits during construction as required for proper coordination of manufacturer-supplied equipment and accessories with the concrete biofilter structure.

B. Participate in Coordination Meetings and Workshops in support of coordination, scheduling, implementation startup and testing of application software (PLC and OI programming).

PART 2 PRODUCTS

2.01 MANUFACTURER

A. Where a manufacturer's standard equipment name and/or model number is listed, the equipment system shall be provided as modified to conform to the performance, functions, features, and materials of construction as specified herein.

2.02 DESIGN CRITERIA

A. The Biofilter System Supplier shall be responsible for incorporating any design modifications and upgrades as may be necessary to meet the performance criteria specified. These modifications and upgrades to the basic design arrangement depicted in the contract documents shall be made at no additional cost.

B. Two biofilter systems shall be provided, which includes the North Odor Control Facility (26,500 cfm) divided into two cells and the South Odor Control Facility (90,500 cfm) divided into three cells per Drawings.

C. Biofilter system shall be:

1. Two-stage with a first stage biotower section followed by a second stage biofilter.

2. Located outdoors. 

3. Designed to eliminate odorous compounds from an air stream typical of

a municipal wastewater treatment plant. The primary odorous compound is hydrogen sulfide, with smaller amounts of mercaptans, reduced sulfur compounds, ammonia and volatile organic compounds typical of this type of application.

4. Designed to treat odorous air continuously ventilated from the following sources as indicated on Drawings: a. North Odor Control Facility:

1) Gravity thickening splitter structure, tanks, and supernatant wet wells.

2) Rotary drum thickeners and feed box. 

3) Pre-digestion mixing tank. 

4) Post-digestion storage tank. 

5) Centrifuges and dewatered sludge conveyors, storage

hopper, and truck bay. 

6) Centrate storage tanks.

2.03

b. South Odor Control Facility: 1) Headworks facility including:

a) Influent splitter structure. b) Fine screens and channels. c) Grit concentrators and channels. d) Fine screens and grit unloading room.

2) Primary clarifier influent splitter structure. 3) Primary clarifiers. 4) Primary clarifier scum wet wells.

SERVICE CONDITIONS

A. Environmental Conditions: The biofilter system shall be designed and incorporate provisions to meet the following service conditions:

1. Environment: Generally dry conditions with periods of intense rainfall during summer storms.

2. Temperature Range: Minus 7 to 95 degrees F.

B. The biofilter shall be designed to remove odorous constituents from process air stream under the following operating conditions:

Process Parameter

Duty Inlet Air Temperature Total Air Volume

Inlet RH (upstream of humidification system)

H2S inlet

Value

North Odor Control Facility (26,500 cfm) divided into two cells per Drawings.

South Odor Control Facility (90,500 cfm) divided into three cells per Drawings.

<30 to 70%

Average Annual: 10 ppm Peak Day: 100 ppm

Continuous 35 to 95 degrees F

C.

The biofilter design shall conform to the following parameters:

Process Parameter

Removal Required

Value

Hydrogen Sulfide: 99 percent removal for concentrations greater than or equal to 10 ppmv. 100 ppbv maximum discharge concentration at inlet concentrations less than 10 ppmv.

Total Odor: Odor removal for inlet detection threshold (DT) concentrations greater than or equal to 6,000 odor units (OU), 90 percent removal; for inlet odor DT concentrations less than 6,000 OU, outlet DT concentration less than 300 OU. (Odor DT concentrations to be determined using ASTM E679 with a 20 liter/minute odor panel presentation rate).

Design Parameter

Manufacturer of Biofilter System

Minimum Empty Bed Residence Time

Media Volume

Minimum Biotower Media Depth

Minimum Biofilter Media Depth

Value

BIOREM Technologies, Inc. or Enduro.

North Odor Control Facility: 5 seconds in the Biotower media section followed by 45 seconds in the biofilter media.

South Odor Control Facility: 5 seconds in the Biotower media section followed by 35 seconds in the biofilter media.

As required to meet the minimum Empty Bed Residence Time or minimum Biotower and Biofilter Media Depth, whichever is greatest, and provide required H2S and odor removal.

5 feet. 6 feet.

1. 2.

3. 4.

The biofilter media shall consist of inorganic, inert hydrophilic cores uniform in shape. Typical media size shall be approximately 1/4-inch by 3/4 inch. The media shall be resistant to degradation and compaction. Media shall not settle by more than 1.5 percent of its original depth within 6 months after installation.

The biofilter media shall not shrink or swell with varying moisture contents. The biofilter media shall be formulated with nutrients, buffering agents and adsorbents for intended operation.

Design Parameter

Maximum Water Consumption Per Cell

Value

North Odor Control Facility:

For Biofilter Irrigation: 30 gpm. For Biotower Blowdown Water: 3 gpm.

South Odor Control Facility:

For Biofilter Irrigation: 60 gpm. For Biotower Blowdown Water: 3 gpm.

D. Allowable pressure drop through the entire two-stage biotower/biofilter system shall be a maximum of 3.25-inch water column (WC) at startup and shall not exceed 6.5-inch WC over time.

E. Media Life: The engineered media shall have a minimum useful life of 10 years. “Useful life” shall be defined to mean operation under the following conditions:

1. No detectable degradation in the odor removal performance of the biofilter when operated and maintained in accordance with the System Supplier’s written operations and maintenance requirements.

2. An increase in air pressure drop that does not exceed the maximum allowable pressure drop specified above.

2.04 SYSTEM COMPONENTS

A. Biotower Media: The biotower (first stage) media shall be inorganic and shall have the following characteristics:

1. Random packed. 2. Consist of inorganic inert hydrophilic media, uniform in shape. 3. Shall not shrink and swell under varying moisture conditions. 4. Shall be BIOREM’s LWE biotower media or Enduro’s equal.

B. Biofilter Media:

C.

5. Biofilter media shall be BIOSORBENSTM as provided by BIOREM or Enduro’s equal, BioOdorSorb, for biofilter applications.

Media Support Systems:

1. The Biotower media support shall be a corrosion resistant FRP grating reinforced with FRP angle beams running perpendicular to the direction of airflow. Angle beams to be supported on both sides of the treatment cell. Grating/beam system to support a minimum loading of 80 pounds per square foot. Grating to be covered with a polypropylene screen to prevent media from falling through the grating openings.

2. The biofilter media support shall be BacTee (or approved equal). The media shall be supported on air distribution baseplates that consist of slotted aeration deck and a support leg structure molded as one piece. The interconnected base plates shall form an integral aeration deck and support leg structure forming an air distribution plenum under the bulk biofilter media.

a. The baseplates shall be manufactured of polyethylene/ polypropylene composite suitable for the temperature limits within the biofilter reactor and for exposure to potential H2S related corrosion attack and the sulfuric acid formation typical in biofilters that creates low pH leachate.

b. The baseplates shall be capable of supporting material handling equipment such as loaders with vertical wheel loads of up to 28,500 pounds per square foot at 60 degrees F and 16,300 pounds per square foot at 120 degrees F with residual surface deflection not to exceed 0.12 inch.

c. Baseplates shall be serviceable and maintainable in all weather conditions ranging from -20 degrees F to 120 degrees F.

d. Baseplates are to be removable for cleaning with the capacity to water flush debris from the air passageway or plenum.

e. Static pressure drop across the air plenum shall not exceed 1/8-inch WC under design flow conditions.

f. Base plate slots shall be no more than 0.25-inch wide and uniformly distributed.

g. Baseplates shall be constructed and installed in a manner that allows the expansion and contraction of each individual plate to occur without creating a gross expansion or contraction of the entire aeration floor over the temperature range of the biofilter operation.

h. A mesh polypropylene screen shall be placed over the baseplate to prevent biofilter media from falling through the air distribution slots.

D. Biotower Recirculation Systems:

1. The biotower recirculation system for each cell shall consist of a spray nozzle assembly above the biotower media stage and a thermoplastic vertical centrifugal recirculation pump with piping. All piping to be Schedule 80 PVC. Spray nozzles to be PVC.

2. Thermosplastic vertical centrifugal recirculation pumps shall be Vanton Sump Gard SG series pumps or equal and include a basket strainer.

3. Pump motors shall be three-phase, 60-Hz, 480 volts, TEFC suitable for Class 1, Division 2.

4. The recirculation pumps shall be constant speed operated continuously for the life of the odor control system.

E. Nutrient Feed Systems: A nutrient feed system for each cell shall be provided to maintain optimal conditions for microbial growth in the biotower section. Polypropylene tank(s), mixer(s), and metering pumps shall be provided per Drawings to deliver adequate nutrients to meet performance requirements. 1-year supply of nutrient dry blend shall be provided.

F. Biofilter Media Irrigation Systems:

1. The biofilter media irrigation system for each cell shall consist of Schedule 80 PVC piping.

2. All piping shall be self-draining for shutdown during winter operation. 

3. The media irrigation systems shall provide full and even coverage of each biofilter cell. 4. The Biofilter System Supplier shall provide valves, Y-strainer, and

required control components. 

2.05 ACCESSORIES

A. B. C.

Lifting Lugs: Equipment weighing over 70 pounds. Provide anchor bolts in accordance with Section 05 50 00, Metal Fabrications. Provide equipment tags in accordance with Section , Signage.

2.06 INSTRUMENTATION AND CONTROLS

A.

General:

1. 2.

Control of the Biofilter System shall be provided by the plant control system, provided by others. The minimum functional requirements of the control system are specified herein. Provide additional instrumentation as required to provide a safe and operable system.

PART 3

B. All instrumentation shall meet the requirements of Section XXXXXX, Package Control Systems.

C. Where possible, all instrumentation shall be provided with Profibus fieldbus communication technology.

D. Water Panel [270ICP11, 270ICP12, 280ICP11, 280ICP12, and 280ICP13]:

1. Provide one water panel for each cell incorporating the following: a. Mechanical and electrical equipment for irrigation water and

humidification water. b. Nutrient feed pump. c. Biofilter irrigation water solenoid valve and Biotower makeup

water solenoid valve. d. Biotower pH element and transmitter e. Irrigation water electromagnetic flow element and transmitters

and Biotower recirculation water electromagnetic flow element

and transmitter. f. Irrigation water pressure transmitter and Biotower recirculation

pressure transmitter. g. Biotower wasting flow indicator (rotameter).

2. Enclosure Rating: Freestanding NEMA 250, Type 12, 316 stainless steel.

3. Power: 120V ac single-phase. 4. Provide mechanical connections for external water supply and

connection with biotower prehumidification and biofilter irrigation

piping. 5. Provide electrical connections for interface with control panel. 6. Panel location as indicated on Drawings.

E. Miscellaneous Field Instrumentation:

1. Biofilter media temperature indicator, one per cell. 2. Biofilter media differential pressure gauge, one per cell. 3. Biotower packing differential pressure gauge, one per cell. 4. Nutrient feed tank low level switch, one per tank.

EXECUTION

3.01 GENERAL

A. Install manufacturer provided items in accordance with manufacturer’s written instructions.

B. The Subcontractor shall give the manufacturer 5 full working days notice prior to media placement. A manufacturer’s representative shall be present during the media installation period.

3.02 INSTALLATION 

A. Placement of the media support system:

1. Subcontractor shall place biotower and biofilter support systems according to the manufacturer’s instructions under supervision of the manufacturer’s representative.

2. The media retention screen shall be placed on top of the media support systems. The screen shall be shipped on a roll and shall be cut onsite by the Subcontractor.

B. Media Placement:

1. Subcontractor shall broom-clean any debris from the biotower and biofilter structure and plenum before placing the media supports and media.

2. Subcontractor shall broom-clean any debris from the media support. 

3. Subcontractor shall broom-clean any debris from the media retention

screen. 

4. Subcontractor shall not permit workers to walk or stand directly on

media. The Subcontractor shall use boards that will sustain worker’s

weight without displacing the media. 

5. Subcontractor shall not compact the media during placement. 

6. Subcontractor shall use an appropriately sized crane or conveyor as

needed to place the media. 

7. Subcontractor shall limit the free fall drop to less than 5 feet to prevent

segregation of media fines and compaction. 

8. Subcontractor shall provide water spray to keep media moist using a

small garden-style hose. 

9. Subcontractor shall level media surface with rakes to ensure a level

surface plus or minus 1 inch. 

10. Subcontractor shall use a graduated stick or pipe to establish media

depth and provide survey elevations in a 10-foot grid over the entire biofilter surface.

C. Media Irrigation and Humidification Spray Systems:

1. Subcontractor shall assemble and solvent weld prefabricated media irrigation manifolds.

2. Subcontractor shall flush the irrigation piping after all piping has been completed.

3. Subcontractor shall install media sprinkler heads. 

D. Control Panel Installation:

1. Subcontractor shall install the control panel. The control panel requires main power supply. The control panel shall be anchored to a concrete pad using four 3/8-inch Type 316 stainless steel bolts, supplied by the

Subcontractor.

 2. Subcontractor shall supply and install all wiring external to the biofilter

control panel. 

3.03 CORROSION PROTECTION

A. Subcontractor shall cover all internal air plenums (top, side and bottom) and reactor walls and floors with a corrosion-resistant coating system CRC-4 per Section XXXXXX, Chemical-Resistant Coatings for Concrete.

B. After equipment and piping installations, Subcontractor shall touchup coating as necessary to ensure coating has not been impaired.

3.04 FIELD QUALITY CONTROL

A. Provide Field Quality Control Tests in Accordance with Section 01 91 14, Equipment Testing and Facility Startup, and as follows:

1. Alignment: Test complete assemblies for correct rotation, proper alignment and connection, and quiet operation.

2. Performance Tests: Conduct performance test on biofilter system under actual or approved simulated operating conditions as described in this Section, Part 3, Article Biofilter Testing: a. Test only after supplier approved acclimation period for biofilter.

Acclimation is not to exceed 3 weeks. b. Collect inlet and outlet Tedlar bag samples.

3.05 STARTING OF SYSTEM/COMMISSIONING 

A. System Supplier shall:

1. Field test and calibrate equipment and demonstrate to the Subcontractor that all equipment will satisfactorily perform the functions intended.

2. Provide all test apparatus required. 

3. The field tests shall be performed under the supervision of the System

Supplier’s representative. 

B. Operator Training:

1. The System Supplier shall provide proper training regarding recommended operation and maintenance procedures. The training shall cover all components of the biofilter system. The training session shall include both classroom and field training. A minimum of 1 man-day shall be assumed for training.

2. The training session(s) shall be held after successful completion of the all field tests and is typically done during the commissioning process.

3.06

1. For a period of 1 year following the date of commissioning of the biofilter system, the System Supplier shall provide a system monitoring package. This package shall be listed as a separate line item with appropriate cost.

2. Owner will provide samples shipped to Biofilter System Supplier following sampling instructions in the O&M manual. The monitoring package shall consist of, but not limited to, the following: a. Bacterial Enumeration.

b. Media pH. c. Media Moisture Content. d. Particle Size Analysis. e. Nutrient Characterization. f. Mineral Deposit Quantification. g. Other parameters as required (application dependant).

3. As a part of this service, data to be collected by the Owner on a minimum of a weekly basis shall include: a. Inlet Air Temperature. b. Media Temperature.

c. Air Flow Rates.

d. H2S inlet concentration. 

4. The package shall include this service at a frequency of every three

months. A quarterly report will summarize the collected and analytical

data and will list deficiencies, recommendations and corrective actions. 

5. The System Supplier shall be intimately familiar with the intricacies of

providing long term service and monitoring contracts. 

BIOFILTER TESTING

A. Factory Testing: Coordinate Factory Testing of control panels for proper operation and application software in both manual and automatic operating modes. Factory Testing shall be complete and approved prior to shipment of control panels to project site.

B. Functional Testing:

C. Monitoring and Service:

1. 2.

3.

Test all system components for proper adjustment and operation in both the manual and automatic operating modes and interface with Plant SCADA. Irrigation System: Allow the biofilter to operate for a 48-hour period with the moisture control system in the AUTO mode and monitor system water use for proper irrigation system operation. Make adjustments as necessary for proper moisture system operation

Provide certification of functional acceptance prior to commencing performance testing.

C.

Performance Testing:

1. General: 

a. To demonstrate that the biofilter system furnished hereunder is

installed and performs in accordance with the provisions of these specifications, the System Supplier shall conduct a performance test in accordance with an approved testing protocol. The performance test shall not commence until a test plan has been submitted and approved, and the functional testing has been completed.

b. The System Supplier shall provide, install, and maintain, if required, all temporary metering or analytical equipment necessary to measure the various performance parameters.

c. The System Supplier shall provide for all sampling and laboratory analysis. Laboratory analysis shall be done by an independent testing laboratory in the United States and paid for by the System Supplier.

d. Before the performance test begins, the System Supplier shall agree upon the procedures and guarantee points to be used.

e. The System Supplier shall inform someone at least 14 days prior to the start of any performance testing. ENGINEER shall have the right to observe, sample, and make any parallel determinations during the performance test.

f. Within 30 days after the conclusion of the test period, the System Supplier shall submit a Performance Test Report, including all laboratory and field test data, stating the conclusions of the test with regard to the performance criteria.

2. Test Conditions: a. The performance test shall be conducted while the sources being

controlled are fully operational. The biofilters shall have been fully functional and receiving odorous air from these facilities for a minimum of 14 consecutive days prior to commencing the testing.

b. All testing, adjusting, and balancing of the fans shall have been completed and approved.

c. Two test samples shall be taken with 2 hours between samples. 

d. The actual sample day shall be chosen for low wind speeds and no

rain or snow. 

e. A portable air flux chamber hood (portable stack) shall be utilized

for biofilter outlet sampling. 

3. Sampling and Data Measurement: During the test period, as a minimum,

the following data and measurements shall be taken at the frequency indicated: 

a. Overall System Airflow Rate: Every hour. 

b. Biofilter Inlet Pressure in Inches of WC: Continuously.

c. Hydrogen Sulfide Concentrations (ppm) At the Inlet to the Biofilter: One sample each hour.

d. Hydrogen Sulfide Concentrations (ppb) At Bed Outlet Every Hour:

1) Take Samples From Three Locations Within Each Cell: One sample from the middle of the cell, two from opposite corners of the cell. The results will then be calculated by: 

a) Percent Removal = (Average Inlet - Average Outlet)/Average Inlet. 

e. Odor Concentrations At the Inlet and Outlet of the Biofilter: One

sample from the inlet, one from the outlet of each cell. Odor concentration sampling locations shall be the same as the hydrogen sulfide sampling locations.

f. Removal calculated as described for hydrogen sulfide. 

g. Sampling Log: A sampling log shall be maintained that will include: 1) Date, time, location, sampler, and results of each sample. 2) Weather conditions for the sampling day. 3) A qualitative description of the operation of the wastewater

and wastewater treatment processes. 4) A description of any exceptions from the sampling plan.

h. System Pressure Drop: Pressure drop measurements shall demonstrate that pressure drops across the biotower and biofilter bed do not exceed pressure limits specified.

i. Hydrogen Sulfide Sampling and Analysis: Field hydrogen sulfide sampling for the biofilter discharge shall be completed using a Jerome Model 631 X Analyzer or approved equal with a detection limit of 1 ppbv. Inlet sampling may use systems such as Odalog H2S data loggers or equal. The analyzers shall be operated in compliance with the manufacturer’s instructions. The results of the hydrogen sulfide sampling shall be recorded in the sampling log.

j. Odor Panel Odor Sampling and Analysis: Biofilter inlet and exhaust outlet shall be sampled and analyzed for odor concentrations as defined by Odor Panel Analysis following ASTM E679. Odor Descriptors and Hedonic tone shall also be reported. Odor panelist presentation rates of 20 liters per minute are to be used. Odor removal performance shall be calculated using average inlet and outlet values for each biofilter complex. Samples shall be collected in Tedlar bags, using the sampling procedure described in EPA Method 18 with either a vacuum chamber or vacuum pump.

k. GC Odor Sampling and Analysis: During the field sampling, gas samples shall also be taken in one liter Tedlar bags at both the biotower inlet ductwork and at the biofilter discharge. These samples shall be sent to an appropriate testing laboratory in the

United States for sulfur analysis according to ASTM D5504. One inlet and one outlet sample are required. GC analysis is being completed primarily for informational purposes and does not constitute the basis for performance testing. The concentrations in ppbv of the following sulfur compounds shall be provided in the analysis report:

1) Hydrogen Sulfide. 2) Carbonyl Sulfide. 3) Methyl Mercaptan. 4) Ethyl Mercaptan. 5) Dimethyl Sulfide. 6) Carbon Disulfide. 7) Isopropyl Mercaptan. 8) tert-Butyl Mercaptan. 9) n-Propyl Mercaptan. 10) Ethyl Methyl Sulfide. 11) Thiophene.

12) Isobutyl Mercaptan. 13) Diethyl Sulfide. 14) Butyl Mercaptan. 15) Dimethyl Disulfide. 16) 3-Methylthiophene. 17) Tetrahydothiophene. 18) 2-Ethylthiophene. 19) 2, 5-Dimethylthiophene. 20) Diethyl Disulfide.

4. Air Distribution Sampling: Using air flux chamber, measure outlet air flow from three locations on each biofilter cell to demonstrate even air distribution (plus or minus 15 percent variation between different sampling locations).

5. Retesting: In the event the biofilter fails to meet the performance requirements, as outlined in Service Conditions, the System Supplier shall immediately make the necessary modifications, adjustments, and/or facility expansions to meet these requirements. The steps taken by the System Supplier shall include, as necessary, design and construction of additional biofilter capacity, upgrades to the air distribution system, and replacement of the media, all at no additional cost to the Owner.

a. Additional performance tests will be conducted by System Supplier until the performance requirements are met.

b. If after three retests the performance requirements are still not met, the Owner will have the option, at the Owner’s sole discretion, to accept the system as is or obtain a replacement media at the expense of the System Supplier.

3.07

6. Demonstration of Performance: Promptly after the performance test is satisfactorily completed, the Owner will give written notice of the final acceptance of the biofilter to the System Supplier.

7. During the guarantee period following an acceptable system performance test, the Owner may, at Owner’s cost, inspect or retest the system for conformance to these Specifications. The System Supplier will be notified of these tests and may witness the test and inspections. If the system fails to meet the performance requirements, the guarantee provisions of these Specifications shall apply.

MANUFACTURERS’ SERVICES

A. A representative for the System Supplier specified herein shall be present at the jobsite for the minimum person days listed for the services hereunder, travel time excluded. Times listed below are per system.

1. 3 person days for installation assistance (including media placement), inspection, and certification of the installation. Provide certificate.

2. 1 person day for training of Owner’s personnel. 3. 1 person day for factory testing. 4. 1 person day for functional and performance testing. 5. 1 person day for post-construction consultation to the Owner in order to

assure the effective operation of the biofilter. 6. Minimum 2 person-days for construction coordination activities.

B. Training of Owner’s personnel shall be at such times and at such locations as requested by the Owner.

END OF SECTION