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Method for reinforcing sludge dewatering performance by means of micro-bubble/flocculating agent coupling

A sludge dewatering and micro-bubble technology, applied in the field of environmental engineering, can solve problems such as environmental pollution, secondary pollution, poor sludge dewatering performance, etc., and achieve the effects of low cost, cost saving, and short processing time

Inactive Publication Date: 2016-12-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a low operating cost, simple process, convenient operation, low energy consumption, and aiming at the problem that the remaining sludge produced by the urban sewage treatment plant is difficult to dehydrate and the follow-up treatment is likely to cause potential secondary pollution to the environment. A method that can better improve the dewatering performance of sludge, realize efficient and rapid separation of free water and bound water in sludge and mud, so as to solve the problem of poor sludge dewatering performance and potential secondary pollution to the environment caused by existing conditioning methods , improve the efficiency of subsequent sludge treatment and disposal, and provide necessary technical support

Method used

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  • Method for reinforcing sludge dewatering performance by means of micro-bubble/flocculating agent coupling

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Embodiment 1

[0027] This embodiment relates to a method for microbubble / PAM coupling to strengthen sludge dewatering performance, which includes the following steps:

[0028] Take liquid sludge with a concentration of 15g / L from a sewage treatment plant in Shanghai, and perform microbubble treatment. The diameter of microbubbles is 10μm, and the treatment time is 30 minutes. Then add 0.1% to the sludge after microbubble treatment. The PAM (sludge dry weight), using a magnetic stirrer to stir, first carry out rapid stirring (100r / min) for 3min, and then carry out slow stirring (35r / min) for 10min, after stirring evenly, the capillary water absorption time of the sludge ( CST) was reduced by 35% compared with untreated sludge, and the amount of PAM was reduced by 0.5 times compared with that of PAM conditioning alone.

Embodiment 2

[0030] This embodiment relates to a method for microbubble / PAM coupling to strengthen sludge dewatering performance, which includes the following steps:

[0031] Take the liquid sludge with a concentration of 30g / L from a sewage treatment plant in Shanghai for micro-bubble treatment. The diameter of the micro-bubbles is 50 μm, and the treatment time is 120 minutes. Then add 0.5% to the sludge after micro-bubble treatment. The PAM (sludge dry weight), using a magnetic stirrer to stir, first carry out rapid stirring (250r / min) for 5min, and then carry out slow stirring (55r / min) for 15min, after stirring evenly, the capillary water absorption time of the sludge ( CST) was reduced by 65% ​​compared with untreated sludge, and the amount of PAM was reduced by 1.0 times compared with PAM conditioning alone.

Embodiment 3

[0033] This embodiment relates to a method for microbubble / PAM coupling to strengthen sludge dewatering performance, which includes the following steps:

[0034] Take the liquid sludge with a concentration of 20g / L from a sewage treatment plant in Shanghai for micro-bubble treatment. The diameter of the micro-bubbles is 20μm, and the treatment time is 45 minutes. Then add 0.2% to the sludge after micro-bubble treatment. The PAM (sludge dry weight), using a magnetic stirrer to stir, first carry out rapid stirring (150r / min) for 4min, and then carry out slow stirring (45r / min) for 12min, after stirring evenly, the capillary water absorption time of the sludge ( CST) was reduced by 40% compared with untreated sludge, and the amount of PAM was reduced by 0.7 times compared with that of PAM conditioning alone.

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Abstract

The invention discloses a conditioning method for reinforcing the sludge dewatering performance by the aid of micro-bubble / flocculating agent coupling technologies. The conditioning method includes carrying out micro-bubble / flocculating agent coupling conditioning on residual sludge from sewage treatment plants, to be more specific, arranging sludge solution into a reaction device capable of generating micro-bubble and carrying out micro-bubble treatment on the residual sludge by the aid of the micro-bubble with the particle sizes of 10-50 micrometers for the treatment time of 0.5-2 h; adding flocculating agents such as PAM (polyacrylamide) into the sludge treated by the aid of the micro-bubble so as to further promote improvement of the sludge dewatering performance. Compared with conditioning methods only by the aid of flocculating agents, the conditioning method has the advantages that the usage of the flocculating agents for the sludge which is conditioned by the aid of the micro-bubble / flocculating agent coupling technologies and has the identical dewatering performance is reduced by 0.5-1.0 time, and the CST of the sludge is reduced by 30-50%; the conditioning method is easy to implement and low in cost and capital investment, and accordingly a technical option can be provided for solving the problem of difficulty in follow-up sludge treatment and disposal for large cities in land occupation shortage.

Description

technical field [0001] The invention relates to a method for enhancing the dewatering performance of sludge by microbubble / flocculant coupling, which uses the microbubble / flocculant coupling technology to condition excess sludge, and belongs to the technical field of environmental engineering. Background technique [0002] Sludge is an inevitable product of sewage biological treatment in urban sewage treatment plants. In 2015, the amount of municipal wet sludge produced in my country has reached 35 million tons, which is an astonishing amount, and the pressure of sludge treatment and disposal is very huge. Sludge dehydration is an important link in sludge treatment and disposal. It can effectively reduce the volume of sludge and reduce the cost of subsequent transportation and treatment of sludge. Usually, sludge is mechanically dewatered to reduce the moisture content. However, since there are a large amount of hydrophilic substances in the sludge and the water content is ...

Claims

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Application Information

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IPC IPC(8): C02F11/14C02F11/08
Inventor 袁海平朱南文楼紫阳沈棒王辉
Owner SHANGHAI JIAO TONG UNIV
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