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Method for improving sludge dewatering performance through ozone/coagulant/hydrophobic polyurethane

A sludge dewatering and coagulant technology, applied in water/sludge/sewage treatment, dewatering/drying/concentrated sludge treatment, sludge treatment, etc., can solve the problem of insignificant sludge dewatering effect and sludge EPS structure Problems such as poor destruction effect, to achieve the effect of improving oxidation efficiency, wide application range and low cost

Inactive Publication Date: 2019-04-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems such as the poor effect of destroying the EPS structure of the sludge in the existing sludge conditioning, the release of bound water in the sludge flocs, and the insignificant dehydration effect of the sludge after conditioning. A method for improving the dewatering performance of sludge with permanent polyurethane, specifically a conditioning method of oxidation cracking-floc reconstruction-moisture channel construction, which reduces the moisture content of the sludge cake to 45%-65% after sludge dehydration, with low cost, It has the advantages of wide application range, clear conditioning steps, convenient operation, and reduced sludge subsequent disposal costs, etc.

Method used

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  • Method for improving sludge dewatering performance through ozone/coagulant/hydrophobic polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The sludge to be dewatered in this implementation example is collected from a domestic sewage treatment plant in Minhang District, Shanghai. The sewage treatment plant uses A 2 The O process treats municipal sewage, and the treatment process is as follows: figure 1 shown. The dewatered sludge is collected in the secondary sedimentation tank. After the sludge was retrieved, it was settled by gravity for 8 hours and passed through 10 mesh and 50 mesh screens. The moisture content of the sludge was 99.5%. Introduce ozone with a concentration of 30mg / g dry sludge into the sludge in the form of microbubbles, react for 30min, and decompose sludge flocs and cells; then add 0.25g / g dry sludge PAC to the sludge, Stir at a speed of 300r / min for 1min, then stir at a speed of 60r / min for 5min to promote the reconstruction of sludge flocs and the release of bound water; add hydrophobic polyurethane materials with a particle size of 2cm to the treated sludge In the solution, the v...

Embodiment 2

[0034] The sludge to be dewatered in this implementation example is collected from a domestic sewage treatment plant in Minhang District, Shanghai. The sewage treatment plant uses A 2The O process treats municipal sewage. The dewatered sludge is collected in the secondary sedimentation tank. After the sludge was retrieved, it was settled by gravity for 8 hours and passed through 10-mesh and 50-mesh sieves. The moisture content of the sludge was 98.5%. Introduce ozone with a concentration of 60mg / g dry sludge into the sludge in the form of microbubbles, react for 60min, and decompose sludge flocs and cells; then add 0.15g / g PAC of dry sludge to the sludge, Stir at a speed of 200r / min for 3 minutes, then stir at a speed of 20r / min for 8 minutes to promote the reconstruction of sludge flocs and the release of bound water; add hydrophobic polyurethane materials with a particle size of 1cm to the treated sludge In the solution, the volume ratio is 35%. After mixing evenly, transf...

Embodiment 3

[0036] The sludge to be dewatered in this implementation example is collected from a domestic sewage treatment plant in Minhang District, Shanghai. The sewage treatment plant uses A 2 The O process treats municipal sewage. The dewatered sludge is collected in the secondary sedimentation tank. After the sludge was taken back, it was settled by gravity for 8 hours, and passed through 10 mesh and 50 mesh screens. The moisture content of the sludge was 99.3%. Introduce ozone with a concentration of 40 mg / g dry sludge into the sludge in the form of microbubbles, react for 35 minutes, and decompose sludge flocs and cells; then add 0.2 g / g dry sludge PAC to the sludge, Stir at a speed of 250r / min for 2min, and then stir at a speed of 40r / min for 6min to promote the reconstruction of sludge flocs and the release of bound water; add hydrophobic polyurethane materials with a particle size of 0.5cm to the treated sewage In the mud solution, the volume ratio is 30%. After mixing evenly,...

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Abstract

The invention provides a method for improving sludge dewatering performance through ozone / coagulant / hydrophobic polyurethane. The method comprises S1, performing gravity settling and screening on original sludge; S2, inletting ozone microbubbles into the sludge processed in S1 for reaction; S3, uniformly mixing the coagulant with the sludge processed in S2 for mixed reaction; S4, uniformly mixingthe hydrophobic polyurethane into the sludge processed in S3, and then performing dewatering treatment to obtain a sludge cake. According to the method for improving the sludge dewatering performancethrough the ozone / coagulant / hydrophobic polyurethane, the ozone achieves moderate decomposition of sludge and flocculates through oxidation, then the coagulant is applied to achieving flocculate reconstruction and positive charge neutralization to further increase the size of sludge flocculates and further achieve conversion from bound water to free water, and the hydrophobic polyurethane is applied to structuring moisture releasing channels to improve the dewatering performance of the sludge. The method for improving the sludge dewatering performance through the ozone / coagulant / hydrophobic polyurethane is significant in synergistic effects, convenient to operate, low in price of conditioning agent, wide in applicability, significant in dewatering effects and the like.

Description

technical field [0001] The invention belongs to the technical field of treatment and disposal of excess sludge in urban sewage plants, and relates to a method for improving the dewatering performance of excess sludge in sewage treatment plants, specifically a method for improving sludge dewatering performance by using ozone / coagulant / hydrophobic polyurethane . Background technique [0002] With the acceleration of my country's urbanization process and the continuous improvement of people's living standards, the urban population is increasing day by day, the discharge of urban domestic sewage is increasing, and the pressure on sewage treatment in cities and towns is becoming increasingly serious. Sludge is a by-product of the biological treatment process of urban sewage treatment plants. If it cannot be treated effectively and properly, it will easily cause serious pollution to the environment. The drastic increase of surplus sludge puts great pressure on the environment. I...

Claims

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Application Information

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IPC IPC(8): C02F11/12C02F11/121C02F11/143C02F11/147C02F11/15
CPCC02F11/12C02F11/121C02F11/14
Inventor 袁海平朱南文俞璐边畅楼紫阳
Owner SHANGHAI JIAO TONG UNIV
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