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Municipal sewage treatment method with zero energy consumption low sludge yield

A technology for urban sewage and treatment methods, which is applied in water/sludge/sewage treatment, water/sewage multi-stage treatment, sustainable biological treatment, etc. problem, to achieve the effect of low sludge yield

Active Publication Date: 2011-01-05
深圳市君脉膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Municipal sewage treatment method with zero energy consumption low sludge yield
  • Municipal sewage treatment method with zero energy consumption low sludge yield
  • Municipal sewage treatment method with zero energy consumption low sludge yield

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Embodiment Construction

[0020] The invention provides a sewage treatment method with zero energy consumption and low sludge yield. Below in conjunction with Fig. 1, an example is given to illustrate the present invention.

[0021] The amount of sewage influent is 100,000 tons / day. The urban sewage pretreated by coarse and fine screens first enters the primary sedimentation tank to remove suspended particles with a large specific gravity, and then the effluent of the primary sedimentation tank, the returned activated sludge and the digested sludge returned by the sludge digestion tank enter together. The aeration tank forms a mixed solution. The aeration tank adopts the method of blast aeration, so that the mixed liquid is in a state of vigorous stirring and is in a suspended state. By controlling the dissolved oxygen content in the aeration tank, the dissolved oxygen content in the front section of the aeration tank is about 0.2mg / L, forming an anoxic section to facilitate the denitrification react...

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Abstract

The invention relates to a sewage treatment method, relating to a sewage treatment technology. The invention discloses a municipal sewage treatment method with zero energy consumption low sludge yield, which comprises the following steps of: leading pretreated municipal sewage into a primary sedimentation basin, and leading the outlet water of the primary sedimentation basin and active backflow sludge of a secondary sedimentation basin into an aeration basin together to form a mixed liquid; leading the mixed liquid of outlet water from the aeration basin into the secondary sedimentation basin, and leading the sedimented and clarified sewage to tertiary sewage treatment or discharging as treatment water; and concentrating the residual active sludge, and discharging the concentrated sludge to an anaerobic sludge digestion unit for digestion treatment. The anaerobic sludge digestion unit digests the sludge under anaerobic conditions, and one part of digested sludge flows back to the aeration basin or the primary sedimentation basin or flows back to the aeration basin and the primary sedimentation basin proportionally; the other part of digested sludge is treated after dehydration. The energy of methane gas is recycled so as to provide energy (electric energy and thermal energy) for sewage and sludge treatment.

Description

technical field [0001] The invention belongs to a sewage treatment technology, in particular to a sewage treatment method with zero energy consumption and low sludge yield 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 cert...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30
CPCY02W10/10
Inventor 余静
Owner 深圳市君脉膜科技有限公司
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