Single-sludge inverse-nitrification dephosphorization denitrification apparatus and method

Abstract

The invention relates to a single sludge denitrification dephosphorization denitriding device and a method thereof, which belong to the sewage treatment engineering technology in the environment engineering. The invention is particularly suitable for the dephosphorization and denitriding treatment of urban sewage and domestic sewage. An internal source denitrification unit (1), a phosphorus releasing unit (2), a denitrification dephosphorization unit (3), a denitrification unit (4), an aerobic unit (5) and a sludge settling unit (6) are connected in series sequentially to form the device. Themethod comprises the following steps: lifting the return sludge from the sludge settling unit (6) through a sludge reflux pump (7) and sending the sludge into the internal source denitrification unit(1) through a sludge return pipe (8), lifting the inputted water through a water intake pump (9) and sending the inputted water into the phosphorus releasing unit (2) and the denitrification unit (4)respectively through a phosphorus releasing water inlet pipe (10) and a denitrification water inlet pipe (11), and lifting the sludge mixed liquid at the tail end of the aerobic unit (5) through a mixed liquid reflux pump (12) and sending the sludge mixed liquid into the denitrification dephosphorization unit (3) and the denitrification unit (4) respectively through a denitrification dephosphorization reflux pipe (13) and a denitrification reflux pipe (14).

Description

technical field [0001] The invention relates to sewage treatment engineering technology in environmental engineering, and is especially suitable for phosphorus and nitrogen removal treatment of urban sewage and domestic sewage, and belongs to the technical field of environmental protection. technical background [0002] Because the existing sewage treatment technology in our country is difficult to effectively remove phosphorus and nitrogen, the nitrogen and phosphorus pollution discharged from point source pollution has not been fundamentally controlled, the problem of eutrophication in lakes (reservoirs) is becoming more and more serious, and nitrogen pollutants in seven major water systems also exceed the standard The problem. Nitrogen and phosphorus pollution in water mainly comes from domestic sewage and agricultural non-point source pollution, among which domestic sewage is the main source of pollution in many water bodies. my country's "Pollutant Discharge Standards ...

AI Technical Summary

Problems solved by technology

However, due to the low C / N problem in most of the urban sewage treatment in our country, the currently used A 2 / O, SBR, oxidation ditch and other processes are difficult to effectively coordinate the contradiction between phosphorus removal and nitrogen removal. At present, most urban sewage treatment plants have the problem that the total nitrogen and total phosphorus are difficult to reach the standard stably.

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