Biosolids Management Sample Clauses

Biosolids Management. ‌ Wastewater treatment plants generate biosolids as part of their operation. Wastewater biosolids consist of stabilized organic material, plus some inorganic material, and can also include a large quantity of water. In Tracy, biosolids are currently dewatered in drying beds, and the water content of the dried solids is, therefore, very low (generally greater than 90 percent solids, as compared to some other dewatering operations that might result in a solids concentration of less than 20 percent); given the urbanization that has occurred in and around the plant site over the past 20-plus years, it is uncertain if solar drying (which requires more space and has a greater potential for odor release than mechanical dewatering processes) is feasible in the future. Solids disposal almost always involves the transport of the solid waste stream, and the less water that is hauled, the less energy (and total number of trips) are required. Further, solar drying on drying beds is less energy-intensive than other dewatering operations, and the use of chemicals to assist in the dewatering operation is eliminated or reduced substantially. The stabilization of the biosolids is generally accomplished by either aerobic (in the presence of oxygen) or anaerobic (in the absence of oxygen) means. Anaerobic treatment is currently used in Tracy. Aerobic systems require the input of large quantities of energy to supply the required oxygen; anaerobic systems require significantly less energy inputs (and they also produce methane as a by-product). The capital cost of anaerobic systems is higher than that for aerobic systems, but for treatment plants greater than about 5-mgd capacity, it is almost always the case that it is economical to employ anaerobic treatment, because the energy input to aerate the biosolids is not required for that operation; the use of satellite treatment plants (expected to be less than 5-mgd capacity) will add significant biosolids management costs that the community will need to fund. Finally, some biosolids reuse plans can beneficially use the nitrogen and other organic constituents that are present in the solids stream. Some wastewater plants actively market their biosolids as a soil supplement; others dispose of their sludge in landfills (either as waste, or, if the solids content is high enough, as alternative daily cover for the landfill), and others use the sludge as a soil amendment for agricultural operations. Some years ago, the City of ▇▇▇▇▇ had ...

Biosolids Management. (a) The Client will be responsible for tendering and setting up accounts directly with the vendors with OCWA listed as an approved purchaser on the Client’s accounts;