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Zero-energy consumption urban sewage dephosphorization treatment method

A technology for urban sewage and phosphorus treatment, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, sludge treatment, etc. It can solve the problems of large volume, high moisture content of urban sludge, and unstable properties. , to achieve the effect of simple process, low sludge yield and simple phosphorus removal effect

Inactive Publication Date: 2011-02-16
余静
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Problems solved by technology

Municipal sludge has high water content, bulky volume, organic matter content as high as 50% to 70%, and unstable properties

Method used

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  • Zero-energy consumption urban sewage dephosphorization treatment method
  • Zero-energy consumption urban sewage dephosphorization treatment method

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Embodiment Construction

[0021] The invention provides a zero-energy urban sewage phosphorus removal treatment method. The following combination figure 1 Examples are given to illustrate the present invention.

[0022] The amount of sewage influent is 100,000 tons / day. The urban sewage is first pretreated by coarse and fine screens to remove suspended solids with a large specific gravity, and then enters the anaerobic tank together with the returned activated sludge and the digested sludge returned from the sludge digestion tank; Gas and mechanical stirring are used to fully stir and mix the sewage and sludge in the anaerobic tank, while controlling the dissolved oxygen concentration below 0.2mg / L to facilitate the biochemical reaction of phosphorus-accumulating bacteria releasing phosphorus. Maintain the dissolved oxygen in the aerobic aeration tank at about 2 mg / L to ensure the smooth progress of the biodegradation of organic matter in sewage and the uptake of phosphorus by phosphorus-accumulating...

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Abstract

The invention relates to an urban sewage dephosphorization treatment method, in particular to a sewage treatment technology. The invention discloses a zero-energy consumption urban sewage dephosphorization treatment method, which comprises the following steps: leading urban sewage after pretreatment and returned digested sludge to enter into an anaerobic tank together for carrying out biochemical reaction; leading effluent from the anaerobic tank to enter into an aerobic aeration tank to carry out degradation of organic matters and reaction of phosphorus uptake of phosphorus-accumulating bacteria; leading mixed liquor of the effluent from the aerobic aeration tank to enter into a secondary sedimentation tank for carrying out sludge-water separation; carrying out sludge concentration on the remaining activated sludge, and then discharging the concentrated sludge to an anaerobic sludge digestion unit for carrying out digestion treatment; and leading the anaerobic sludge digestion unit to digest the sludge under anaerobic conditions, leading one part of the digested sludge to return to the anaerobic tank or the aerobic aeration tank, or leading one part of the digester sludge to return to an anoxic tank and the aerobic aeration tank respectively according to proportion, and leading the other part of the digested sludge to carry out sludge disposal after dehydration.

Description

technical field [0001] The invention belongs to a sewage treatment technology, in particular to a zero-energy phosphorus removal treatment method for urban sewage. Background technique [0002] With the rapid development of my country's national economy and the continuous acceleration of urbanization, the amount of urban domestic sewage has also increased significantly, and exceeded the discharge of industrial wastewater for the first time in 1999, accounting for 52.9% of the total sewage discharge in the country. In recent years, the amount of domestic sewage in cities and towns has been increasing at an average annual rate of 5%, and has become the main pollution source of my country's water environment. Urban sewage treatment is one of the industries with high energy consumption. On the one hand, high energy consumption leads to higher sewage treatment costs, and on the other hand, it also exacerbates my country's current energy crisis to a certain extent. Therefore, re...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F9/14C02F11/04
CPCY02E50/343Y02E50/30Y02W10/10Y02W10/20
Inventor 余静
Owner 余静
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