All correspondence must be made through the Vendor Portal. Specifications include, but are not limited to: Provide an odor control system for the removal of hydrogen sulfide from the biosolids dewatering process in the Dewatering Building located adjacent to the Compost Facility. The system could be turn-key or require the purchase of the chemical equipment. Biosolids are pumped from the WPCP main control building approximately 1,550 feet through an 8-inch diameter pipe to two belt filter presses in the Dewatering Building. One or both belt filter presses can be in operation, with each press operating in the range of 120 to 200 gallons per minute of sludge. Belt press operation normally occurs 8-10 hours per day five days per week. Atmospheric hydrogen sulfide levels have ranged from 0 to 30 ppm two feet above the biosolids discharge onto the gravity belt of the belt filter presses. The goal of the odor control system is to maintain a level under 2 ppm at this point, and never exceed 5 ppm at any location in the dewatering building. Failure to control hydrogen sulfide to these levels would be cause to terminate the services contract. Vendor would be responsible for removal of all of the vendor’s equipment at no additional charge to the City. The odor control system should include chemical storage tank(s), chemical feed pump(s), chemical dosage control system, preventative and corrective maintenance on the equipment, and safety training for WPCP staff. The chemical(s) used shall not be harmful to existing pipes, equipment, or beneficial use of biosolids through the composing process. The system should be operational within eight weeks of purchase order.
