Nitrogen and phosphorus removal combined up-to-standard technology for riverway sewage treatment

Abstract

The invention provides a nitrogen and phosphorus removal combined up-to-standard technology for riverway sewage treatment. Nitrogen and phosphorus pollutants in riverway water are removed in an ex-situ treatment mode combining efficient air flotation with a BIOSTYR type BAF (biological aerated filter). The BAF adopts the BIOSTYR type and is divided into an aerobic treatment unit and an anaerobic treatment unit for upper and lower section type treatment, a volume ratio of an anaerobic packing area and an aerobic packing area can be adjusted according to change of an aeration position, and nitration and denitrification can be realized synchronously through reflux; packing in the anaerobic packing area is solid denitrification slow-release carbon source packing, and can slowly and stably supply a carbon source in the operating process. According to the treatment technology, nitrogen and phosphorus can be removed synchronously and efficiently, and content of COD, nitrogen and phosphorus intreated effluent can meet the class III quality standard of environmental quality standards for surface water (GB 3838-2002).

Description

technical field [0001] The invention belongs to the field of river sewage treatment for denitrification and phosphorus removal, and specifically relates to a combined system of nitrogen and phosphorus removal for river sewage treatment and a standard-reaching process. Background technique [0002] With the rapid development of urbanization and the improvement of living standards, a large amount of industrial wastewater, domestic sewage, and plant nutrients in farmland runoff are discharged into urban rivers, causing the nitrogen and phosphorus content of the river to far exceed the normal level, thereby deteriorating the water quality and ecological environment. The system and water functions are destroyed, especially in the spring and summer when the temperature gradually rises, some river sections even have a large increase in the biomass of aquatic plants and phytoplankton for a certain period of time, and serious algal blooms, duckweed floods, Eutrophication secondary di...

AI Technical Summary

Problems solved by technology

Biological denitrification is the main way to remove nitrogen, but microorganisms need organic matter as carbon source and energy to realize it. The content of organic matter available in river water is low, and the water volume is too large. The cost of adding carbon source is too high and it is difficult to apply. Low carbon-to-nitrogen ratio is the bottleneck of denitrification and denitrification of river water, and the removal effect of biological denitrification on phosphorus is poor, so it is difficult to achieve simultaneous denitrification and phosphorus removal

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