Sewage treatment device for enhanced deep nitrogen and phosphorus removal process

Abstract

The invention discloses a sewage treatment device for an enhanced deep nitrogen and phosphorus removal process. According to the device, on the basis of two-stage AO, an anaerobic tank is additionallyarranged at the front section to form a five-section AO process with independent functions, an anoxic tank I adopts an annular gallery type design, and baffling water inlet and outlet modes are beneficial to water flowing without dead angles; the amount of returned sludge can be adjusted by a returned sludge diversion trench and an adjusting valve; the sewage flows back into the anaerobic tank and the anoxic tank I in proportion respectively, so that microorganisms utilize organic matters and endogenous denitrification in inlet water to remove returned nitrate nitrogen and adjust the reflux quantity of the anaerobic tank, phosphorus release of phosphorus-accumulating bacteria is facilitated, greater potential is provided for phosphorus absorption of an aerobic zone, and the removal rate of total nitrogen in the inlet water is increased; the oxidation pond enables organic substances in the water to be subjected to bond breaking and ring opening, so that the biodegradability of a secondary effluent is improved, and the advanced sewage treatment efficiency is improved by utilizing the special performance of a nitrogen removal filter material and a phosphorus removal filter material;the device is reasonable in structural design, compact in layout and small in occupied area, nitrogen and phosphorus in water are effectively removed, the effluent quality is guaranteed, and energy consumption is reduced.

Description

technical field [0001] The invention provides an enhanced deep denitrification and dephosphorization process sewage treatment device, which belongs to the technical field of sewage treatment and environmental protection equipment. Background technique [0002] Sewage denitrification and phosphorus removal has always been a hot spot in the field of water treatment. With the excessive nitrogen and phosphorus content in water, the water quality has deteriorated sharply, water environmental pollution and water eutrophication have become increasingly serious. Higher requirements are put forward for the degree of sewage treatment and discharge standards in rural villages and towns, especially for the removal of total nitrogen and total phosphorus. [0003] At present, the anaerobic-anoxic-aerobic (AAO) process has been widely used in sewage treatment. However, the sewage treatment mechanism of AAO has the following problems: ①Because the anaerobic zone is in the front, the nitrat...

AI Technical Summary

Problems solved by technology

However, the sewage treatment mechanism of AAO has the following problems: ①Because the anaerobic zone is in front, the nitrate in the return sludge will have an adverse effect on the anaerobic zone; ②The anoxic zone is located in the middle of the system, and denitrification is in the distribution of carbon sources It is in a disadvantageous position, thus affecting the denitrification effect of the system; ③The phosphorus uptake power accumulated by phosphorus accumulating bacteria in the anaerobic zone is consumed inefficiently in the anoxic zone; ④Most of the microorganisms only experience the alternating anoxic / aerobic environment, In order to achieve higher nitrogen and phosphorus removal efficiency, a larger reflux ratio is generally required, resulting in problems such as higher investment and energy consumption.

[0004] At present, the existing technologies of AO, A2O, and improved processes all have problems such as poor nitrogen and phosphorus removal effects, high energy consumption, long process, unreasonable layout, and poor effluent quality; The competition between denitrifying bacteria and denitrifying bacteria for carbon source; the contradiction of sludge age between denitrifying bacteria, phosphorus accumulating bacteria and nitrifying bacteria; the influence of nitrate in returning sludge on phosphorus release, etc. The pure phosphorus removal technology is subject to certain restrictions in application, and it is difficult to achieve the treatment effect

Images