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Processing method of urban sewage sludge reduction

A technology for urban sewage and treatment methods, which is applied in centrifugal separation water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., and can solve the problems of high water content of mud cake, difficult post-treatment, and low dehydration rate.

Active Publication Date: 2008-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most commonly used flocculant is polyaluminum chloride (referred to as PAC). Although it has certain flocculation performance, the biggest disadvantage is that the mud cake has a high water content during the treatment process, and it is loose and easily broken, and the dehydration rate is low. Difficulty with post-processing

Method used

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  • Processing method of urban sewage sludge reduction
  • Processing method of urban sewage sludge reduction
  • Processing method of urban sewage sludge reduction

Examples

Experimental program
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preparation example Construction

[0022] The preparation process of flocculant A of the present invention is as follows:

[0023] Using acrylamide monomer and dimethylaminoethyl methacrylate monomer as the main raw materials, first quaternize the dimethylaminoethyl methacrylate monomer, and then quaternize the acrylamide and dimethylaminoethyl methacrylate After the ammonium monomer and deionized water are mixed in a certain proportion, nitrogen is blown to remove dissolved oxygen, and finally an initiator is added for polymerization.

[0024] Wherein the quaternization reaction of dimethylaminoethyl methacrylate monomer is to add hydrochloric acid to the dimethylaminoethyl methacrylate monomer to adjust the pH value to 2-9, preferably 4-8, and the reaction is a violent exotherm The reaction should be carried out in a water bath or ice water bath or take other temperature control measures. The reaction ratio (molar ratio) of acrylamide and dimethylaminoethyl methacrylate quaternized monomer is: acrylamide: di...

Embodiment 1

[0041] In a 500ml four-necked flask equipped with a stirrer, a thermometer, a feeding tube, and a nitrogen inlet and outlet, add 15.7g of dimethylaminoethyl methacrylate, add 15ml of 1N HCl, adjust the pH value to 5.5, and then add acrylamide 28.4g, 400ml of deionized water, after mixing evenly, pass nitrogen to remove oxygen, add initiator potassium persulfate 10 -4 mol / L, react in a water bath at 50°C for 6 hours to obtain flocculant A-1. Intrinsic viscosity: 1050cm 3 / g; cationic degree is 2.3mmol / g.

Embodiment 2

[0043] In a 500ml four-neck flask equipped with a stirrer, a thermometer, a feeding tube, and a nitrogen inlet and outlet, add 9.6g of dimethylaminoethyl methacrylate, add 5ml of 1N HCl, adjust the pH value to 8.0, and then add acrylamide 38.6g, 440ml deionized water, after mixing evenly, pass nitrogen gas to remove oxygen, add initiator potassium persulfate 2×10 -4 mol / L, initiator sodium sulfite 1×10 -5 mol / L, react in a water bath at 25°C for 3 hours, and then react in a water bath at 80°C for 1.5 hours to obtain flocculant A-2. Intrinsic viscosity: 1200cm 3 / g; cationic degree is 1.2mmol / g.

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Abstract

The invention relates to the processing method of the urban sewage and sludge reduction. The flocculating agent A is first added in the urban sewage and sludge and added with flocculating agent B to further react after emulsion breaking reaction. The flocculating agent A is a quaternary ammonium type cationic polymer and the flocculating agent B is a cationic polymer with aminomethyl polyacrylamide as the basis. The urban sludge processed by the method of the invention has volume greatly reduced, hard mud cake, low water ratio, which can meet the requirement of the subsequent landfill, composting and burning treatment and realize the comprehensive utilization of the sludge.

Description

technical field [0001] The invention relates to a treatment method for urban sewage sludge reduction. The volume of urban sewage sludge treated by the method of the present invention is greatly reduced, the mud cake is firm, and the water content is low, which can meet the requirements of subsequent landfill, composting, and incineration treatment, and realize comprehensive utilization of sludge. Background technique [0002] With the development of social economy and urbanization in our country, the amount of urban sewage is constantly increasing, which directly leads to a large increase in the amount of sludge. Municipal sludge refers to solid, semi-solid and liquid waste produced by sewage treatment plants, containing a large amount of organic matter, rich in nitrogen, phosphorus and other nutrients, heavy metals, pathogenic bacteria and pathogenic bacteria, etc., and often accompanied by malodorous gases . If it is discharged arbitrarily without treatment, it will caus...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/38
Inventor 杨丽王有华
Owner CHINA PETROLEUM & CHEM CORP
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