Zero-energy consumption and low sludge yield method for denitrifying urban sewage
A technology of urban sewage and treatment methods, applied in the direction of water/sludge/sewage treatment, water/sewage multi-stage treatment, sustainable biological treatment, etc., can solve the problem of large volume, high water content of urban sludge, unstable properties, etc. problem, to achieve the effect of simple denitrification effect, low sludge yield and simple process
Active Publication Date: 2012-07-04
深圳市君脉膜科技有限公司
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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
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[0021] The invention provides a sewage denitrification treatment method with zero energy consumption and low sludge yield. 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 anoxic tank together with the returned activated sludge and the digested sludge returned from the sludge digestion tank; the internal circulation (mixing The reflux rate of liquid b) is maintained at about 150% to provide the nitrate nitrogen required for the denitrification reaction; the sewage and sludge in the anoxic tank are fully stirred and mixed by means of blast aeration and mechanical stirring to facilitate The denitrification reaction proceeds. Maintain the dissolved oxygen in the aerobic aeration tank at about 2mg / L to ensure the biodegradation of organic...
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Abstract
The invention discloses a method for denitrifying urban sewage, relates to sewage treatment technology and discloses a zero-energy consumption and low sludge yield method for denitrifying urban sewage. The method comprises the following steps of: allowing pretreated urban sewage, refluent mixed liquid from an aerobic aeration tank and refluent digested sludge to enter an anoxic tank at the same time for undergoing biochemical reactions such as denitrification and the like; allowing water discharged from the anoxic tank to enter the aerobic aeration tank for undergoing degradation and nitration reactions of organisms; allowing the mixed liquid discharged from the aerobic aeration tank to enter a secondary sedimentation tank for separating sludge from water; concentrating remaining active sludge and discharging the concentrated sludge into an anaerobic sludge digestion unit for digesting; and digesting the sludge under an anaerobic condition by using the anaerobic sludge digestion unit,wherein a part of digested sludge flows back to the anoxic tank or the aerobic aeration tank or flows back to the anoxic tank and the aerobic aeration tank according to proportion respectively while the other part of digested sludge is dehydrated and undergoes sludge treatment.
Description
technical field [0001] The invention belongs to a sewage treatment technology, in particular to a denitrification sewage treatment method of urban sewage with zero energy consumption and low sludge yield. 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 c...
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IPC IPC(8): C02F9/14C02F3/30
CPCY02E50/343Y02E50/30Y02W10/10
Inventor 余静
Owner 深圳市君脉膜科技有限公司