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Device and method for processing C/N urban household wastewater by A2O-BAF (Biological Aerated Filter) process

A technology of urban domestic sewage and process, applied in aerobic and anaerobic process treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., to achieve the effect of saving carbon source and saving aeration

Inactive Publication Date: 2010-12-22
BEIJING UNIV OF TECH
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Problems solved by technology

However, due to the above reasons, it is difficult to make the denitrification and dephosphorization stable to a good state, which requires us to transform and optimize and upgrade the deficiencies in the process

Method used

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  • Device and method for processing C/N urban household wastewater by A2O-BAF (Biological Aerated Filter) process
  • Device and method for processing C/N urban household wastewater by A2O-BAF (Biological Aerated Filter) process

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Embodiment 1

[0026] A 2 The device for treating low C / N urban domestic sewage by the O-BAF process includes sequentially connected water inlet tanks (1), A 2 An O reactor (2), a secondary settling tank (3), an intermediate water tank (4), a BAF reactor (5) and an outlet water tank (6) are formed. A 2 The anaerobic zone and the anoxic zone of the O reactor are equipped with stirring devices respectively, and the sludge return pipeline at the bottom of the sludge hopper of the secondary settling tank (3) passes through the return pump and A 2 The water inlet end of the anaerobic section of O(2) is connected, and the outlet water tank (6) is connected to A through the nitrification liquid return pipeline and return pump. 2 The water inlet end of the anoxic zone of the O reactor (2) is connected.

[0027] The sewage treatment method has the following steps:

[0028] (1) Raw water is pumped into A from the water inlet tank (1) by a peristaltic pump 2 The anaerobic zone of O(2) also enters ...

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Abstract

The invention discloses a device and a method for processing C / N urban household wastewater by an A2O-BAF (Biological Aerated Filter) process. The device comprises a water inlet tank, an A2O reactor, a secondary sedimentation tank, an intermediate water tank, a BAF reactor and a water outlet tank connected in sequence. Raw water and return sludge are pumped from the water inlet tank to an anaerobic zone; mixed liquor in the anaerobic zone and nitration liquor enter in the anaerobic zone; the mixed liquor in the anaerobic zone then enters in an aerobic zone; mixed liquor from the A2O enters in the intermediate water tank; supernate is pumped from the intermediate water tank to the BAF; sludge in the secondary sedimentation tank reflows to the anaerobic zone; the separated supernate enters in the BAF in which effluents water enters in the water outlet tank; and part of water in the water outlet tank reflows to an anoxic zone and the other part is discharged. The invention reduces the aeration amount, saves carbon sources, effectively improves the nitration and prolongs the backwashing time of the BAF.

Description

technical field [0001] The invention relates to a device and method for treating urban domestic sewage, which can achieve deep denitrification and dephosphorization of low C / N domestic sewage, and belongs to the field of sewage treatment. Background technique [0002] Excessive discharge of nitrogen and phosphorus elements has become an important factor for water eutrophication. The most important way to control water eutrophication is to carry out deep denitrification and phosphorus removal of sewage, starting from the source of pollution. There are many factors that affect sewage treatment, among which the carbon source is more important. The most obvious feature of domestic sewage in my country is low C / N, which requires us to propose a process that can deeply remove nitrogen and phosphorus from low C / N domestic sewage. Almost all simultaneous denitrification and phosphorus removal processes are single-sludge systems, that is, microorganisms with different physiological ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30
Inventor 彭永臻王建华陈永志王淑莹
Owner BEIJING UNIV OF TECH
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