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Method for improving settling property of activated sludge

A technology of activated sludge and settling performance, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc. Expansion and other problems, to achieve the effect of improving flocculation and sedimentation performance, preventing anaerobic fermentation, and improving sedimentation performance

Active Publication Date: 2017-02-15
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The poor settling performance of activated sludge may be due to the following reasons, 1. The sludge load is too low, 2. Sludge swelling, 3. Sludge poisoning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for improving the settling performance of activated sludge, comprising the steps of:

[0022] (1) The wastewater containing activated sludge is pretreated to remove gravel, stones, and fragments, and then add a degreasing agent to remove the grease dispersed in the wastewater together with other organic dirty substances. The degreasing agent is determined by weight percentage It is composed of 0.003% polyoxyalkylene isohexadecyl decyl ether, 0.005% by weight sodium lauryl sulfate, and 0.005% by weight fatty alcohol ether sodium sulfate to obtain a solid-liquid mixture;

[0023] (2) The solid-liquid mixture is transported to a conical settling tank or clarifier at the bottom, and by gravity settling, the activated sludge solids with good settling properties are separated and exported from the bottom;

[0024] (3) Transport the remaining mixture on the upper part of the conical sedimentation tank or clarification tank to the aeration tank, feed oxygen into the ae...

Embodiment 2

[0031] A method for improving the settling performance of activated sludge, comprising the steps of:

[0032] (1) The wastewater containing activated sludge is pretreated to remove gravel, stones, and fragments, and then add a degreasing agent to remove the grease dispersed in the wastewater together with other organic dirty substances. The degreasing agent is determined by weight percentage 0.5015% polyoxyalkylene isohexadecyl decyl ether, 0.1025% by weight sodium lauryl sulfate, and 0.5025% by weight fatty alcohol ether sodium sulfate to obtain a solid-liquid mixture;

[0033] (2) The solid-liquid mixture is transported to a conical settling tank or clarifier at the bottom, and by gravity settling, the activated sludge solids with good settling properties are separated and exported from the bottom;

[0034] (3) Transport the remaining mixture on the upper part of the conical sedimentation tank or clarification tank to the aeration tank, feed oxygen into the aeration tank, ma...

Embodiment 3

[0041] A method for improving the settling performance of activated sludge, comprising the steps of:

[0042] (1) The wastewater containing activated sludge is pretreated to remove gravel, stones, and fragments, and then add a degreasing agent to remove the grease dispersed in the wastewater together with other organic dirty substances. The degreasing agent is determined by weight percentage It is composed of 1% polyoxyalkylene isohexadecyl decyl ether, 0.2% by weight sodium lauryl sulfate, and 1% by weight fatty alcohol ether sodium sulfate to obtain a solid-liquid mixture;

[0043] (2) The solid-liquid mixture is transported to a conical settling tank or clarifier at the bottom, and by gravity settling, the activated sludge solids with good settling properties are separated and exported from the bottom;

[0044] (3) Transport the remaining mixture on the upper part of the conical sedimentation tank or clarification tank to the aeration tank, feed oxygen into the aeration tan...

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Abstract

The invention discloses a method for improving settling property of activated sludge. The method comprises steps as follows: wastewater containing the activated sludge is pretreated; activated sludge solids with good settling property are separated through gravity settling; the activated sludge with poor settling property is conveyed to an aeration tank for aeration treatment, and an oxygen bearing solid-liquid mixture is obtained; the oxygen bearing solid-liquid mixture is subjected to gravitational separation by a hydraulic cyclone, and coarse particle substances, a concentrated liquid and liquid-solid suspended matter are obtained; activated sludge with the improved settling property is obtained through gravity settling of the coarse particle substances and the concentrated liquid; the activated sludge with the improved settling property and the activated sludge solids with the good settling property are combined. According to the method, BOD (biochemical oxygen demand) load of the separated activated sludge with the poor settling property is improved by the aid of the aeration tank, meanwhile, excessive organic matter and nitrogen are consumed through aerobic bacteria, and the sludge is prevented from anaerobic fermentation; finally, colloidal components and tiny particles capable of causing membrane pollution and inducing scaling of a membrane air diffuser are removed through gravitational separation, and the settling property of the activated sludge is effectively improved; the process is simple, and the method has quite broad industrial application value.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for improving the settling performance of activated sludge. Background technique [0002] Activated sludge is a flocculent substance formed by the coagulation and interweaving of microorganisms, suspended matter, and colloidal substances. The center of its structure and function is the bacterial gel group. On the bacterial gel group, bacteria, fungi, protozoa and Some metazoans, these microorganisms can secrete colloidal substances with adhesiveness, have strong adsorption capacity for tiny particles and soluble organic matter, collide and stick with suspended particles under the action of water flow, and form activated sludge flocs. The separation of mud and water by gravity is an important link in the activated sludge treatment system, and the sedimentation performance of the sludge determines the overall efficiency of the treatment process. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/38C02F1/40C02F1/52C02F3/1205C02F9/00C02F2301/08
Inventor 魏翔魏东洋贺涛方晓航陈禧李浩李宇伍高燕
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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