Novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity

A ferrate, oxidation treatment technology, applied in water/sludge/sewage treatment, oxidation treatment of sludge, biological water/sewage treatment, etc. Sewage treatment efficiency and other issues, to avoid sludge bulking problems, simple equipment, and low prices
CN102583937AInactive Publication Date: 2012-07-18NINGBO UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NINGBO UNIVERSITY OF TECHNOLOGY
Publication Date
2012-07-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

A novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity comprises the steps that a emical treatment unit effectively removes and converts organic pollutants into inorganic small molecular substance through microorganism in a biochemical treatment system, and the certain sludge concentration in the biochemical treatment unit is maintained; in a sediment unit, sewage produced after the treatment of the biochemical treatment unit enters a secondary sedimentation tank to perform sludge-water separation, a part of subsided sludge is excess sludge, the rest is returned sludge, and two third of returned sludge directly enters the biochemical treatment unit; in a ferrate oxidization treatment unit, one third of returned sludge enters a sludge reaction tank to react with input ferrate for 10-30 minutes, wherein the mass ratio of the ferrate to the excess sludge is 0.2:1; and a sludge dewatering unit performs filter pressing or centrifugal dewatering of the excess sludge. The novel sewage treatment process can reduce 35-45% of excess sludge quantity, has the advantages of being simple in devices, few in investment, free of pollution, convenient to operate and manage, low in operation cost and the like, and is suitable for application of industrial municipal sewage treatment plants.
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Description

technical field

[0001] The invention relates to a sewage treatment process for reducing sludge by utilizing ferrate oxidation. The process can effectively reduce the output of excess sludge while purifying sewage, and reduce the subsequent treatment and disposal costs of excess sludge, and can be used in industrial and urban domestic sewage treatment plants (stations). Background technique

[0002] The biological sewage treatment method based on activated sludge is currently the most widely used sewage biological treatment technology in the world, but it has always had one of the biggest drawbacks, that is, it will produce a large amount of excess sludge. With the increasing amount of sewage and the continuous improvement of sewage treatment rate, my country's sludge production will increase significantly in the next few years. Although the sludge volume only accounts for 1-2% of the sewage volume, the investment in sludge treatment facilities accounts for about 40-50% of t...

Claims

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