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Method for improving dewatering performance of concentrated sludge

A technology of dewatering performance and thickening sludge, applied in water/sludge/sewage treatment, sludge treatment, biological sludge treatment, etc., can solve the problems of unsatisfactory effect, high moisture content of mud cake, slow dehydration rate, etc. , to achieve good sludge dewatering effect, low cost, and the effect of reducing odor

Inactive Publication Date: 2019-07-26
NANJING JIANGDAO INST OF ENVIRONMENT RES CO LTD
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  • Abstract
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Problems solved by technology

[0002] The dehydration of concentrated sludge has always been a worldwide problem, especially the concentrated sludge produced by industrial wastewater treatment contains a large amount of organic matter, which has strong hydrophilicity and high bound water content. Plate and frame filter press, belt dehydrator, vacuum dehydration The dehydration rate is slow when the machine is used for mechanical dehydration, the water content of the mud cake is high, the effect is generally not ideal, the specific resistance of the sludge is high, and the dehydration rate is slow

Method used

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Embodiment

[0021] Embodiment: a method for improving the dewatering performance of concentrated sludge, comprising the following steps:

[0022] a. Add sulfuric acid to the sludge to adjust the pH of the sludge to 3-3.5. In this embodiment, the pH value is preferably equal to 3.2. Then add flocculant to the sludge and stir quickly to make the sludge and flocculant Fully mix to flocculate the sludge particles;

[0023] b. Add surfactant, stir at low speed for 7-9 minutes, then add hydrogen peroxide mixed solution, after oxidizing for 34-36 minutes, use vacuum filter to complete the first-level dehydration of sludge;

[0024] c. Under the condition of 33-35°C, add hydrolytic acidifying bacteria to the sludge that has completed the first-stage dehydration in step b, heat up to 53-55°C, add acetogenic bacteria and methanogenic bacteria to degrade the sludge organic matter in the sludge, and then add quicklime and walnut shells to adjust the pH value to greater than 11, wherein the content r...

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Abstract

The invention discloses a method for improving the dewatering performance of concentrated sludge, and relates to the technical field of sludge dewatering. The method includes the steps: a, feeding sulfuric acid into the sludge, adjusting the PH (potential of hydrogen) of the sludge to be 3-3.5, feeding flocculating agents into the sludge and flocculating sludge particulates; b, adding surfactants,performing low-speed stirring for 7-9 minutes, adding hydrogen peroxide mixed solution, performing oxidization for 34-36 minutes and finishing primary dewatering of the sludge by a vacuum filter; c,adding hydrolytic acidification bacteria into the sludge subjected to primary dewatering in the step b under the condition of 33-35 DEG C, increasing temperature to 53-55 DEG C, adding acetogenic bacteria and methanogenic bacteria, degrading organic substances in the sludge and then feeding calcined lime and walnut shells; d, treating the sludge in the step c by ultrasonic waves with the power of11.5-12W / L. Ultrasonic time is 125-130 seconds, sound energy density is 0.14-0.15W / mL, the regulated sludge to be dewatered is conveyed to a centrifugal dehydrator, secondary dewatering treatment is finished, and the sludge can be dewatered.

Description

technical field [0001] The invention relates to the technical field of sludge dewatering, in particular to a method for improving the dewatering performance of concentrated sludge. Background technique [0002] The dehydration of concentrated sludge has always been a worldwide problem, especially the concentrated sludge produced by industrial wastewater treatment contains a large amount of organic matter, which has strong hydrophilicity and high bound water content. Plate and frame filter press, belt dehydrator, vacuum dehydration The dehydration rate is slow when the machine is used for mechanical dehydration, the water content of the mud cake is high, the effect is generally not ideal, the specific resistance of the sludge is high, and the dehydration rate is slow. Contents of the invention [0003] The technical problem to be solved by the invention is how to reduce the sludge specific resistance and improve the dewatering performance. [0004] In order to solve the ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148C02F11/06C02F11/121C02F11/02C02F11/127C02F11/10
CPCC02F11/02C02F11/06C02F11/10C02F11/121C02F11/127C02F2303/02C02F2303/04C02F2303/06C02F2305/02C02F11/148
Inventor 柴春燕任仁张徐祥邱天
Owner NANJING JIANGDAO INST OF ENVIRONMENT RES CO LTD
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