Short-range denitrification/dephosphorization device and method based on sludge side pretreatment

Abstract

The invention relates to a short-range denitrification / dephosphorization device and method based on sludge side pretreatment, belonging to the field of sewage treatment. The device comprises a municipal sewage raw water tank, a denitrification / dephosphorization reactor, an intermediate water tank, a short-range nitration reactor, a first sludge pretreatment reactor and a second sludge pretreatment reactor. The method comprises the following steps: municipal sewage enters the denitrification / dephosphorization reactor, sludge subjected to FNA pretreatment is added, and microbes convert organic matters in raw water and pretreated sludge into PHAs; the sewage enters the short-range nitration reactor to perform short-range nitration; and on the basis of sludge side pretreatment, part of surplus sludge is subjected to FNA treatment and flows back into the reactor to inhibit the propagation of nitrite oxidizing bacteria, thereby implementing and maintaining the short-range nitration of the system stable. The sewage subjected to short-range nitration is synchronously denitrified and dephosphorized. The method quickly and stably implements the short-range denitrification / dephosphorization, saves the carbon sources, reduces the sludge amount, and lowers the sewage treatment energy consumption.

Description

Technical field: [0001] The invention relates to a short-range denitrification and phosphorus removal device and method based on sludge side pretreatment, belonging to the technical field of low C / N ratio urban sewage treatment and residual sludge biochemical treatment reduction. Background technique: [0002] With the increasing eutrophication of water bodies, biological nitrogen and phosphorus removal processes have been widely studied and applied. my country's urban sewage has the problems of low carbon to nitrogen ratio (C / N) and insufficient carbon source, which makes it particularly difficult for traditional processes to treat nitrogen and phosphorus in sewage at the same time. Denitrification and phosphorus removal technology has become a current research hotspot due to its advantages of simultaneous nitrogen and phosphorus removal, reduction of carbon source and energy requirements, and low sludge output. The principle of this technology is to combine the two processes o...

AI Technical Summary

Problems solved by technology

Excess sludge not only contains recyclable resources, but also contains harmful substances such as pathogens and heavy metals, which is easy to cause secondary pollution, and relevant research shows that its treatment and disposal costs are high, accounting for 60% of the total operating costs of sewage treatment plants

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