Biological two-stage contaminated water treatment system and process

摘要

The systems and methods may be used for treatment of water that contains contaminants. Water containing at least one of a nitrate, percholate, chromate, selenite, and a volatile organic chemical is combined with nutrients and then is processed in an anoxic-anaerobic bioreactor. The combined effluent may also be oxygenated by dosing with hydrogen peroxide or liquid oxygen. The combined effluent of the bioreactor is dosed with a particle conditioning agent. The combined effluent treated water of the bioreactor is then filtered in a biofilter to produce a treated effluent stream. The influent water and combined effluent of the anoxic-anaerobic bioreactor may also be dosed with hydrogen peroxide to control biomass content in the system.

主权项

1. A method for treatment of water that contains contaminants comprising:
dosing an influent water stream containing at least one of a nitrate, perchlorate, chromate, selenate, and a volatile organic chemical with a dosing amount of one or more nutrients; after dosing the influent water stream with the one or more nutrients, processing the influent water stream in an anoxic-anaerobic bioreactor; dosing an effluent treated water stream of the anoxic-anaerobic bioreactor with a dosing amount of a particle conditioning agent; oxygenating the effluent treated water stream of the anoxic-anaerobic bioreactor; and after dosing the effluent treated water stream with the particle conditioning agent and oxygenating the effluent treated water stream, filtering the effluent treated water stream in an aerobic biofilter to produce a treated effluent stream, monitoring, using one or more sensors, at least a measured dissolved oxygen content in the influent water stream, a measured dissolved oxygen content in the treated effluent stream, a measured nitrate content in the influent water stream, and a measured turbidity value in the effluent treated water stream, wherein the dosing amount of the of one or more nutrients, the dosing amount of the particle conditioning agent, and the oxygenating of the effluent treated water stream are periodically adjusted by a program logic controller based upon data received from the one or more sensors, wherein the dosing amount of the one or more nutrients is adjusted by the program logic controller based at least in part upon the measured dissolved oxygen content in the influent water stream and the measured nitrate content in the influent water stream, wherein the dosing amount of the particle conditioning agent is adjusted by the program logic controller based at least in part upon the measured turbidity value in the effluent treated water stream, and wherein the oxygenating of the effluent treated water stream is adjusted by the program logic controller based at least in part on the measured dissolved oxygen concentration in the treated effluent stream.