Method of using wastewater flow equalization basins for multiple biological treatments

摘要

One or more flow equalization basins or lagoons are utilized for performing hydrolysis of ATP as the first stage of biological phosphorus reduction, selective reduction of biological oxygen demand (BOD), deamination, and denitrification of nitrate and nitrite compounds, in addition to simultaneous flow equalization of wastewater produced by food processing operations on a 2-to-6-day schedule. The inflow half of a single basin or an entire first basin is. operated on an anaerobic/anoxic basis. The outflow half of the single basin or an entire second basin, if present, is operated on an anoxic/aerobic basis. A downstream nitrification reactor is operated on an aerobic/anoxic basis or is operated exclusively on an aerobic basis if followed by an anoxic reactor. The treatment controllably utilizes the high BOD/TKN and BOD/TP ratios in the inflow to the initial basin and controllable and selectively usable mixed liquor recycles to achieve the first stage of biological phosphorus reduction and denitrification of nitrate and nitrite compounds. The result is that nitrification of only ammonia, produced by deamination, and the luxury uptake stage of phosphate ions by polyP bacteria must be done downstream of the basin or basins, termed FEB reactors herein.