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Organic wastewater treatment method and treatment device

A treatment method and a technology of a treatment device, which are applied in the directions of biological water/sewage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems such as tea-brown turbidity of the treated water, and achieve improved settling, The effect of maintaining membrane flux and improving membrane flux

Inactive Publication Date: 2012-06-20
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, if iron salt is directly added to the biological treatment tank, depending on the situation, the treated water may become dark brown and cloudy

Method used

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  • Organic wastewater treatment method and treatment device
  • Organic wastewater treatment method and treatment device
  • Organic wastewater treatment method and treatment device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] Next, Examples and Comparative Examples will be described.

[0064] For convenience of description, comparative examples are given first.

Embodiment 1

[0084]The raw water is introduced into the ferric salt mixing tank (capacity: 10 L) at the front stage of the biological treatment tank instead of the biological treatment tank, and an aqueous solution of ferric chloride is added to the ferric salt mixing tank, and the organic drainage and ferric chloride are stirred for 5 minutes After mixing, the mixture was supplied to a biological treatment tank, and treated under the same conditions as in Comparative Example 2 except that. The pH of this iron salt mixing tank was 6.5.

[0085] As a result, the differential pressure of the impregnated separation membrane hardly increased, and stable operation was possible for 2 months. After 2 months, the differential pressure increased to 30kPa.

[0086] Next, the amount of iron added was automatically adjusted so that the pH of the iron salt mixing tank was 5.0. As a result, the differential pressure of the impregnated membrane did not increase at all during the subsequent two months. ...

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Abstract

Treated water having excellent water quality is effectively obtained, thereby improving the sedimentation property, concentration performance, and filterability of sludge in an activated sludge liquid mixture in a biotreatment tank by adding an iron salt. When an iron salt such as ferrous salt, ferric salt, or polyferric sulfate is added to organic wastewater in biotreatment, the iron salt is added to and mixed with the organic wastewater and the water mixture is mixed with an activated sludge and biologically treated. By mixing the organic wastewater and the iron salt in advance at close to the optimum pH of ferric hydroxide, turbidity of the treated water caused by the generation of iron oxide and iron carbonate is prevented.

Description

technical field [0001] The invention relates to a treatment method and a treatment device for organic drainage by biologically treating organic drainage through an activated sludge method, in particular to a method for improving the sludge generated during biological treatment of organic drainage by an activated sludge method Settling, concentrating, filtering, and a method and device for efficiently obtaining treated water with good water quality. Background technique [0002] Biological treatment is known as a treatment method for organic waste water. Among the biological treatment methods, the activated sludge method using a microbial community called activated sludge is widely used because it can be applied to water containing organic matter of various properties and can obtain treated water with good water quality. [0003] In the biological treatment tank treated by the activated sludge method, a mixed solution (activated sludge mixed solution) of organic waste water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F1/44
CPCC02F3/1215C02F2101/30Y02W10/10C02F1/44C02F1/66C02F3/12
Inventor 田中有深濑哲朗泽田繁树
Owner KURITA WATER INDUSTRIES LTD
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