DIVISION 11 - EQUIPMENT
Section 11___ - Integrated Fixed Film/Activated Sludge

1.01 SCOPE OF WORK

A. Installation of Integrated Fixed Film / Activated Sludge System, comprised of looped polyester active fabric media providing growth sites for biomass, installed on modular frames, as shown on drawings and as specified herein.

A. ASTM - American Society for Testing and Materials

B. AISC Code of Standard Practice

 

A. Definitions:

1. Active Fabric Media – The Active Fabric Media shall be loop knitted polyester fabric in either a web mesh geometry of 1, 2, or 3 inch mesh sizes, or alternatively, in linear runs of looped cord-type media to be installed side by side to approximate the mesh pattern.

2. Media Support Frames – Media Support Frames are to be constructed of stainless steel and shall serve to hold the Active Fabric Media in an arrangement maximizing the effective biological surface while minimizing contact between adjacent sheets of Active Fabric Media.

B. Description of Integrated Fixed Film / Activated Sludge System:

1. System shall provide for the following requirements:

a. Number of aeration basins: ____

b. Basin Length: ____ ft.

c. Basin Width: ____ ft.

d.Basin Depth: ____ ft.

e. Area of Active Fabric Media required: ____ sq. ft.

f. Active Fabric Media Mesh size: ____ in.

g. Total number of Media Support Frames ____

2. System includes Active Fabric Media factory installed on Media Support Frames, ready for placement in aeration basins.

C. Interface with Adjacent System(s):

1. Install Integrated Fixed Film / Activated Sludge System within the aeration basins as recommended by Integrated Fixed Film / Activated Sludge System manufacturer, or as directed on project drawings.

D. Tolerances:

1. Media Support Frames shall be installed true level, plus or minus __ in. (13 mm) in height.

2. Adjacent support cross members on the Media Support Frames that support and separate the Active Fabric Media shall be no less than 3-in. (75 mm) centerline to centerline.

3. At no point shall the Media Support Frames be in physical contact with the sides or bottom of the aeration basin, except in support locations as specifically shown on Integrated Fixed Film / Activated Sludge System’s manufacturer’s drawings.

4. The lowest point of the bottom row of support rods on the Media Support Frames shall be no closer than 6 in. (150 mm) from the top of any diffusers in the aeration basin.

5. The highest point of the top row of support rods on the Media Support Frames shall be at least 2 in. (50 mm) below the un-aerated liquid level in the aeration basin.

E. Performance Requirements:

1. The Active Fabric Media mesh shall be affixed to the support rods of the Media Support Frames sufficiently such as to prevent significant in-service contact and adhesion of adjacent sheets of mesh, while permitting a continuous flexing action and oscillation of individual panels of mesh as the aeration basins are being aerated.

2. The installed Integrated Fixed Film / Activated Sludge System shall offer no substantive cause for variation in, or interference with, the operating hydraulic profile of the aeration basin.

3. The Active Fabric Media shall be capable of fixing and accumulating biomass.

4. Within each sq. ft. of Active Fabric Media mesh, there shall be a minimum of ____ linear ft. of Media material to ensure sufficient area as biomass growth sites.

5. The material shall have a minimum tensile strength of 1,000 lbs. per sq. ft.

6. The Integrated Fixed Film / Activated Sludge System shall be suitable for normal wastewater temperatures and normal domestic pH levels between 6.0 and 8.5.

7. Media Support Frames shall be designed with sufficient structural capability to carry the accumulated weight of the Active Fabric Media and biomass growth. Further, the design shall be such that the installed frames may be removed by following the Integrated Fixed Film / Activated Sludge System manufacturer’s recommendations from time to time as may be required without excessive stress or structural failure.

 

A. Qualifications of Manufacturer:

1. Integrated Fixed Film / Activated Sludge System manufacturer shall certify that they have a similar installation of the Integrated Fixed Film / Activated Sludge System in a wastewater treatment application, and at least 10 years continuous experience in manufacture and supply of Fixed Film Systems in wastewater treatment applications.

2. The Integrated Fixed Film / Activated Sludge System shall be a standard product of the Manufacturer specifically designed for wastewater applications.

3. Pre-qualification is required for bidding, except for acceptable manufacturers named herein.

B. Installation Requirements:

1. Install System in the aeration basin in accordance with Manufacturer’s written instructions.

2. Integrated Fixed Film / Activated Sludge System manufacturer provides services of qualified factory employee onsite to provide instructions on storage, handling, installation, etc in accordance with the requirements of Section 3.03 A.

 

A. Shop drawings required for following:

1. Integrated Fixed Film / Activated Sludge System layout.

2. Media Support Frames.

B. Product Data required as follows:

1. Active Fabric Media

a. Materials of construction

2. Media Support Frames

a. Materials of construction

b. Design calculations sealed by a registered Professional Engineer showing forces, stresses and safety factors.

C. Integrated Fixed Film / Activated Sludge System Installation instructions.

D. Samples

1. At least 10 days prior to bid, submit to Engineer samples of Active Fabric Media (minimum 2 ft. wide x 2 ft. long (0.600 m x 0.600 m)) for any manufacturers to be considered for pre-qualification to bid. Include with submittal sample 3 copies of complete product specifications, and written instructions for installing Integrated Fixed Film / Activated Sludge System. Sample to be retained by Owner. Manufacturers named as acceptable herein are not required to submit samples.

E. Operating and Maintenance (O&M) Instructions:

1. O & M Instructions shall include:

a. Storage and installation procedures

b. Operating instructions

c. Maintenance instructions

F. Certificates:

1. Provide certificate of compliance with Quality Assurance requirements of Section 1.04 A.

2. Provide required installation references, along with notarized certification of ten years of continuous experience in the manufacture and supply of wastewater fixed film systems.

 

A. Delivery

1. The Integrated Fixed Film / Activated Sludge System shall be shipped and delivered to job site with a minimal amount of on-site assembly.

B. Storage

1. Equipment shall be stored in a manner that does not degrade quality or serviceability.

2. All modules to be stored in the open beyond 2 months shall use a light colored cover. Ideally these covers should be double sided, such as a white on black. The white outward facing side should reflect light. Clear or black covers are prohibited. Black will absorb heat and if the cover comes in direct contact with the Media, this heat can be quickly transferred to the Media.

3. Covers can not be wrapped tightly around the Media Support Frames. There should be at least a 6-in. (150 mm) air gap between the cover and top of modules. The ends of the cover should be securely anchored on all sides with at least a 12-in. (300 mm) air gap at the bottom. These covers must provide shade while allowing airflow to prevent build up of heat.

4. Modules should be checked at least once a week to identify minor repairs that the cover may need. Covers can become loose over time due to wind or rain and must be re-secured.

5. Modules exposed to extended non-operational periods in the aeration basin shall be adequately protected to prevent damage by temperature and weather conditions.

C. Handling

1. Abusive handling of the material shall not be permitted.

 

A. Brentwood Industries, Inc. of Reading, Pennsylvania.

1. AccuWeb® Active Fabric Media System

B. Approved equal. (Pre-qualification required per Section 1.05 C).

A. Active Fabric Media:

1. The Active Fabric Media shall be constructed of a knitted loop fabric fashioned into a web-like mesh. The Media shall be comprised of a combination of high tenacity 1000 denier filament polyester (>98%) and 150 denier filament polyester (<2%). The media shall have loops of approximately 0.5 in. (12 mm) or greater circumference extending from the fabric.

2. The component fibers shall have a specific gravity of 1.38, excellent chemical, acid resistance, essentially zero water absorption, and a short duration exposure melting point of not less than 240º C.

3. In no event shall rigid, structured media be allowed, as they fail to allow sufficient flow and aeration, and they fail to flex, thereby shedding excess biomass.

B. Media Support Frames:

1. The material of construction shall be 304 stainless steel. The individual members shall be either welded or bolted into a rigid frame, providing a structure for supporting the Media.

 

2.03 FABRICATION

A. The Media shall be installed on the Media Support Frames in a pattern such that the Media mesh sheets follows an alternating up/down pattern. The Media web shall be stretched to create the mesh openings and allow the Media to generally cover the entire width of the Frames.

B. The stretching of the webbed mesh to the sides of the Media Support Frames shall create a self-tensioning system. If individual strands are substituted for the webbed mesh system, the manufacturer shall incorporate an adjustable tensioning device to ensure that the individual strands can be maintained in tension. Additionally, manufacturer’s supplying a system utilizing individual strands shall incorporate a tension measurement device to ensure that the strands are not subsequently tensioned in excess of the strand tensile strength, leading to broken strands, loss of media surface and contamination of the aeration basin with loose strands.

 

A. Field measurements:

1. Field verify all dimensions affecting installation with special attention paid to the dimensions and clearances of the aeration basin. If any discrepancies are found between actual field measurements and the enclosed drawings, Contractor must notify Engineer and Integrated Fixed Film / Activated Sludge System supplier immediately

2. Layout all work prior to installation.

B. Protection:

1. Protect adjacent surfaces, piping and other items as may be required.

2. Protect Integrated Fixed Film / Activated Sludge System as outlined in Section 1.06 B.

 

A. Approval for installation or incorporation in this project will be made only after submittal of shop drawings, or other data as specified herein.

B. The Integrated Fixed Film / Activated Sludge System shall be installed in accordance with Manufacturer’s recommendations.

C. After completion of installation, the Contractor shall submit a written Certificate of Proper Installation (CPI).

 

A.Integrated Fixed Film / Activated Sludge System manufacturer shall provide the services of a qualified factory field installation supervisor. Such supervision shall be provided for ___ working days (max.) (not to exceed 8 hrs per day), and ____ trips (max.) with a maximum stay of 30 days per trip.

 

A. The Integrated Fixed Film / Activated Sludge System, including Active Fabric Media and Media Support Frames shall be guaranteed to be free from defects in material and workmanship for a period of 1 year from date of Substantial Completion by Owner, or 14 months from date of shipment, whichever is earlier.

 

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