46 66 16 - Trojan Open Channel UV Disinfection System.pdf

46 66 16 – TROJAN OPEN CHANNEL UV DISINFECTION SYSTEM

Herbert, Rowland & Grubic, Inc. 46 66 16 - 1 005153.0436

SECTION 46 66 16 – TROJAN OPEN CHANNEL UV DISINFECTION SYSTEM

PART 1 - GENERAL

1.1 SUMMARY

A. Scope:

Furnish all labor, materials, equipment and appurtenances required to provide an open channel gravity flow ultraviolet (UV) disinfection system. To be complete and operational with all control equipment and accessories as shown and specified.

B. Related Work (Specified Elsewhere):

1. Cast-in-Place Concrete.

2. Anchor Bolts, Expansion Anchors and Concrete Inserts.

3. Electrical.

1.2 QUALITY ASSURANCE

A. Pre-qualification Requirements: Any alternate UV manufacturer that is not named or listed as approved equal must submit the following 15 days prior to bid to be considered for approval:

1. To be considered, the manufacturer will be regularly engaged in the manufacture of UV systems with a proven track record of at least one thousand (1,000) municipal installations in North America.

2. The manufacturer will provide documentation of previous experience with municipal UV disinfection systems in wastewater applications with electronic ballasts.

3. Pre-qualification submittals from manufacturers will include a complete and detailed proposal of equipment offered, including the number of lamps proposed and a detailed description of any exceptions taken to the specification.

4. To be considered, the manufacturer will submit a bioassay evaluation for the proposed reactor. This bioassay will have been validated by an independent third party and have followed protocols described in the US EPA Design Manual –

Municipal Wastewater Disinfection (EPA/625/1-86/021), without exception. The manufacturer’s bioassay report must demonstrate that the proposed UV system design and number of lamps will deliver the specified dose.

5. Documentation of UV manufacturer's service capabilities including location and experience.

6. Sample disinfection performance guarantee including scope and duration of guarantee- minimum of 5 years required.

7. All UV manufacturers will be required to pre-qualify, unless the manufacturer is the base bid manufacturer.

Herbert, Rowland & Grubic, Inc. 46 66 16 - 2 005153.0436

B. Design Criteria:

1. Provide equipment which will disinfect an effluent with the following characteristics:

a. Peak Flow: 0.20MGD(US).

b. Total Suspended Solids: 30 mg/L (30, grab sample).

c. Ultraviolet Transmittance @ 253.7 nm: 65%, minimum.

d. Annual Effluent Temperature Range: 33 to 85 ºF or 0 to 29 ºC.

e. Effluent standard to be guaranteed: 200 Fecal Coliform, 30 Day Geometric Mean.

2. The UV equipment will be installed in a stainless steel channel furnished as part of this system, and having dimensions as shown on the drawings.

3. The system supplied will be arranged in the following manner.

a. Number of Lamps in each UV Lamp Module: 2.

b. Number of UV Lamp Modules: 8.

c. Number of UV Banks: 2.

4. The lamp array configuration will be evenly spaced in both horizontal and vertical rows with all lamps parallel to each other and to the effluent flow.

C. Performance Requirements:

1. The UV system will be designed to deliver a minimum UV dose of 30 mJ/cm2, in effluent with a UV Transmission of 65% after reductions for quartz sleeve absorption, sleeve fouling, and lamp aging. The basis for evaluating the UV dose delivered by the UV system will be the manufacturer’s bioassay as carried out by an independent third party. Bioassay validation methodology to follow protocols described in US EPA Design Manual - Municipal Wastewater Disinfection (EPA/625/1-86/021), without exception.

2. The UV system will produce an effluent conforming to the following discharge permit: 200 Fecal Coliform, 30 Day Geometric Mean. Grab samples will be taken in accordance with the Microbiology Sampling Techniques found in Standard Methods for the Examination of Water and Wastewater, 19th Ed.

1.3 SUBMITTALS

A. Shop Drawings: Submit for review shop drawings showing the following:

1. Complete description in sufficient detail to permit an item comparison with the specification.

2. Dimensions and installation requirements.

3. Descriptive information including catalog cuts and manufacturers specifications for components.

4. Electrical schematics and layouts.

5. Independent bioassay report demonstrating dose delivered under design conditions.

6. Experience documentation.

Herbert, Rowland & Grubic, Inc. 46 66 16 - 3 005153.0436

1.4 GUARANTEE

A. Equipment:

The equipment furnished under this section will be free of defects in material and workmanship, including damages that may be incurred during shipping for a period of 12 months from date of substantial completion or 18 months after shipment, whichever comes first.

B. UV Lamps:

The UV lamps to be warranted for a minimum of 12,000 hours (non-prorated) or thirty-six

(36) calendar months from shipment, whichever comes first. Pro-rated lamp warranties will not be accepted. On / off cycles are limited to an average of four (4) per day without exception.

PART 2 - PRODUCTS

2.1 MANUFACTURER

A. Trojan Technologies, of London, Ontario, Canada. If other equipment is proposed, the Contractor must demonstrate to the Engineer and the Owner that all requirements of materials, validation, experience, performance, and workmanship have been met or exceeded by the equipment proposed. Contractors proposing alternate manufacturers will be responsible for all costs associated with system evaluation and redesign including all electrical, mechanical and civil aspects of the installation.

2.2 GENERAL REQUIREMENTS

A. Provide a UV disinfection system complete with UV lamp modules, effluent channel (if stainless steel), level control, and UV monitoring system as shown on the Contract Drawings and as herein specified.

B. UV system will be designed for complete outdoor installation, without shelter or supplemental cooling or heating required.

2.3 DESIGN, CONSTRUCTION AND MATERIALS

A. General:

1. All material in contact with effluent will be stainless steel or quartz.

2. All material exposed to UV light will be stainless steel, anodized aluminum, quartz 214, or Teflon™.

B. UV Module (UVM):

1. Each UV lamp module will consist of 2 lamps and their corresponding electronic ballast. Each lamp will be enclosed in its individual quartz sleeve, one end of which will be closed and the other end sealed by a lamp end seal and holder.

2. The electrical wires connecting the lamps to the electronic ballasts will be enclosed in the stainless steel frame. Systems where lamp wiring is submerged in the effluent and exposed to UV light will not be allowed.

Herbert, Rowland & Grubic, Inc. 46 66 16 - 4 005153.0436

3. Each UV module will be provided with a standard 120 Volt plug and weatherproof cable for connection to a receptacle. The cable will be 10 ft (3.0 m). A total of 8 UV modules will be supplied. Lamp status will be displayed on top of each UV module using watertight LED indicator lights.

4. Modules will be approximately 68.20 in long, 14.16 in high and 2.8 inches (7.1 cm) wide, weighing approximately 30 lbs. Materials of construction will be stainless steel type 316, anodized aluminum, quartz 214, and Teflon™, with UL rating of Type 6P

C. UV Lamps:

1. UV system will use low pressure mercury slimline lamps of the hot cathode, instant start design.

2. 90% of UV output will be within the wavelengths of 233.7 to 273.7 nm.

3. The operating life of the lamp will be guaranteed for 12,000 hours, non pro-rated.

4. Independent validation of lamps aging factor is required.

D. Lamp End Seal and Lamp Holder:

1. The open end of the lamp sleeve will be sealed by means of a sleeve nut which threads onto a sleeve cup and compresses the sleeve ‘O' ring.

2. The sleeve nut will have a knurled surface to allow a positive handgrip for tightening. The sleeve nut will not require any tools for removal.

E. UV Lamp Sleeves:

1. Quartz sleeves to be Type 214 clear fused quartz circular tubing as manufactured by General Electric or equal.

2. Quartz to be rated for UV transmission of 89% and not subject to solarization.

3. The nominal wall thickness will be 1.0 to 2.0 mm to maximize UV transmission.

F. Effluent Channel:

1. Each UV unit will be provided with one (1) effluent channel complete with drain (if concrete provided by other if stainless steel by UV manufacturer), UV module support rack and downstream level control weir.

2. The effluent channel will have the following dimensions: Length 8 ft, width 1 ft, and height 1 ft 5 in [if channel is stainless steel].

G. Level Control Weir:

1. Weir will be located downstream of the UV modules to maintain an average water depth of 5 inches/cm and ensure lamp submergence at all times.

2. Maximum effluent level variance from zero to peak flow will not exceed 1.5 inches (3.8 cm).

3. Weir will be welded water tight and include a drain.

H. Electrical:

1. The UV disinfection system will be divided into 8 UV modules.

2. Interconnecting Cables to be standard 120 Volt, weatherproof, 10 feet (3.0 m) long and will be suitable for outdoor installation.

3. Power Distribution Receptacles:

Herbert, Rowland & Grubic, Inc. 46 66 16 - 5 005153.0436

a. 120 Volt receptacles rated for continuous outdoor use will be provided.

Receptacles will be of the duplex type complete with ground fault interrupter circuitry.

b. Receptacles to be provided by the UV Manufacturer.

4. Power Consumption:

a. Maximum power draw to UV System will be 0.70 kilowatts.

b. All electrical supplies will be 120 Volt, 60 Hz.

c. A separate 120 volt, 5 amp supply to be provided for the Monitoring

System.

I. Cleaning Procedure:

The UV lamp modules will be cleaned by removing from the effluent channel and hand wiping the sleeves with an acid solution, using a non-abrasive cloth.

J. Monitoring System:

1. 2 submersible UV sensor(s) per bank will continuously monitor the UV intensity produced in the bank of UV lamp modules. The sensor will measure the germicidal portion of the light emitted by the UV lamps.

2. UV intensity will be indicated on a 3 character display in mW/cm2.

3. Elapsed time in hours (lamp age) will be indicated on a 5 character display.

4. Both displays will utilize LEDs and will be visible through the panel door.

5. A dry contact will be provided for remote indication of Low UV intensity alarm.

6. Monitoring System will be enclosed in a Fiberglass Type 4X wall mounted panel and is to be located less than twelve (12) feet (3.66 m) from the LED end of the UV Module.

K. Power Distribution Receptacle (PDR):

1. Duplex ground fault interrupter receptacle(s) will be provided by the UV Manufacturer.

2. Receptacles will be mounted in an individual, impact resistant thermoplastic junction box complete with a Type 3R rain shield for outdoor installation.

Contractor to supply appropriate 120 Volt, single phase, 60 Hz circuit to power the PDRs which have a total current draw of approximately 6.40 amps. Contractor to be responsible for distributing the power from the main 120 Volt feed to the individual PDRs. Responsibility to be all encompassing and in accordance with the local electrical codes.

L. Transition Connections:

1. 1 inlet and 1 outlet transition box(es) will be supplied per channel.

2. The material of construction for the transition boxes will be stainless steel type

304, 14 gauge.

3. Openings on the transition boxes (for flange connections) conform to ANSI standards and have dimensions as shown on the Contract Drawings.

M. Maintenance Rack:

Type 304 stainless steel maintenance rack(s) will be supplied. The rack is designed to hold UV modules during service or maintenance.

Herbert, Rowland & Grubic, Inc. 46 66 16 - 6 005153.0436

N. Spare Parts: The following additional parts will be furnished:

a. 8 UV Lamps.

b. 8 Lamp Sleeves.

c. 8 Lamp Holders.

d. 2 Operators Kit (including 1 face shield, gloves).

PART 3 - EXECUTION

3.1 INSTALLATION

A. In accordance with shop drawings, and Manufacturer's instructions.

3.2 MANUFACTURER'S REPRESENTATIVE'S SERVICES

A. As specified.

END OF SECTION