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Joint-conditioning dehydration method for sludge

An ideal technology for sludge, which is applied in the field of combined sludge conditioning and dehydration, can solve the problems of large amount of pretreatment sludge and difficult operation control, etc., and achieve the goal of increasing solid content, improving sludge dewatering performance, and facilitating comprehensive utilization Effect

Inactive Publication Date: 2013-02-06
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

However, the amount of pretreatment sludge before sludge conditioning in this method is too large, and the sludge needs to be biologically acidified in advance. After acidification, the pH drops to 2-3, and the operation is difficult to control.

Method used

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  • Joint-conditioning dehydration method for sludge

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Embodiment 1

[0026] Its operation process is as figure 1 As shown, the sludge in the concentration tank is acidified with inorganic acid (pH=5), and then transported to the Fenton reagent oxidation tank (H 2 o 2 The dosage is 2g / L, FeSO 4 The dosage is 2.4g / L, and the reaction time is 60 minutes), the sludge reacts with the Fenton reagent under continuous stirring in the oxidation tank, the organic matter in the sludge is degraded, and the cell wall and extracellular polymer (EPS) in the sludge After being dissolved and broken, a large amount of water inside the cells and EPS bound water are released; when the Fenton reaction is complete, 8g / L of CTMAB is added for conditioning; then the sludge is flocculated and conditioned with CPAM (CPAM is added at 75mg / L L, the stirring method is 400rpm for 30s and then 60rpm for 5min), the dispersed fine particles in the sludge are adsorbed and flocculated to achieve good mud-water separation; then the sludge is transported to the mechanical dehydr...

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Abstract

The invention is named as 'a joint-conditioning dehydration method for sludge', belonging to the technical field of environmental engineering and sludge treatment. The joint-conditioning dehydration method comprises the following steps of: adding H202 and FeSO4 into the sludge (with pH being equal to 5) acidified by mineral acid, degrading organic matter by virtue of strong oxidation of a Fenton reagent, and dissolving and cracking microbial cells and extracellular polymeric substances in the sludge; adding a surfactant CTMAB (Cetyl Trimethyl Ammonium Bromide) into the sludge to reduce the surface tension of the sludge and change the surface characteristics of the sludge, and transforming a part of interstitial water into free water; and flocculating sludge particulates with disperse structure, small particle diameter and large specific surface area by virtue of flocculation action of polyacrylamide (CPAM) to the sludge particulates. After the sludge is subjected to joint conditioning of the Fenton reagent, the surfactant and the CPAM, the moisture content of the sludge after being centrifugally dewatered is reduced to 78.2% from 87.7%, and the output of mud cakes is reduced to 0.115t / m<3> from 0.218t / m<3>, therefore, the dehydration property of the sludge can be improved remarkably, the investment and operation costs are reduced effectively, and an ideal sludge reduction goal is reached.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and sludge treatment, and focuses on a combined conditioning and dehydration method for sludge, so as to improve the sludge dehydration performance and realize the purpose of sludge reduction. Background technique [0002] With the increase of my country's sludge production year by year, the follow-up treatment of excess sludge has become a major problem faced by many cities. The excess sludge has a high moisture content and poor dehydration performance, and usually cannot meet the requirements for subsequent treatment and disposal, resulting in the difficulty and high cost of subsequent sludge disposal, which has become a constraint for sludge reduction, harmless, and resourceful treatment and disposal. main factor. Therefore, improving sludge dewatering performance to reduce sludge moisture content and effectively realize sludge reduction has become a research topic with impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06C02F11/14
Inventor 马俊伟曹芮王洪涛刘杰伟岳东北
Owner BEIJING NORMAL UNIVERSITY
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