Device and method for strengthening resource utilization of excess sludge by sidestream biological nitrogen and phosphorus removal process

Abstract

The invention discloses a device and a method for strengthening resource utilization of excess sludge by a sidestream biological nitrogen and phosphorus removal process, and belongs to the technical field of biological sewage treatment. One part of returned sludge in a secondary sedimentation tank enters a side flow reaction zone, and activated sludge which has a harmful effect on the environmentdue to the fermentation capacity of phosphorus-accumulating bacteria Tetrasphaera is used as a substrate for fermentation, so that sludge reduction and resource utilization are realized; and the otherpart of the returned sludge and the returned sludge in a side flow fermentation zone enter an anoxic zone of a main flow reaction zone together for denitrification nitrogen and phosphorus removal, and then enter an aerobic zone for aerobic phosphorus absorption and nitrification, so that the biological nitrogen and phosphorus removal process is completed. According to the invention, sludge reduction and resource utilization are realized by utilizing the sludge fermentation effect in the side flow reaction zone, and as volatile fatty acid VFA in inlet water and VFA generated by side flow sludge fermentation directly enter the anoxic zone, the available carbon source in the anoxic zone is increased, the nutrient removal effect is greatly enhanced, and the sewage treatment process is simplified.

Description

technical field [0001] The invention relates to a device and a method for strengthening resource utilization of excess sludge by a side-flow biological denitrification and dephosphorization process, and belongs to the technical field of sewage biological treatment. Background technique [0002] The traditional biological nitrogen and phosphorus removal theory holds that in the mainstream anaerobic zone, phosphorus accumulating bacteria and denitrifying bacteria absorb the volatile fatty acid VFA in the influent and store internal carbon sources, and the phosphorus accumulating bacteria release phosphate into the water, which accumulates in the anoxic zone. The phosphorus bacteria use the internal carbon source stored in the anaerobic section to denitrify and remove phosphorus. The denitrifying bacteria use the carbon source in the sewage and the body to denitrify and denitrify. Turn it into nitrate, the phosphorus accumulating bacteria complete the aerobic phosphorus uptake,...

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Problems solved by technology

With the increase of urban sewage discharge, the output of excess sludge has also increased sharply. Many sewage treatment plants cannot properly treat excess sludge. Because excess sludge contains a large number of toxic and harmful substances such as pathogenic microorganisms and heavy metal ions, Random dumping and landfilling of excess sludge will cause secondary pollution to the environment

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