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Multi-section plate membrane sludge concentration process method

A technology of sludge concentration and process method, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc. It can solve the problems of anaerobic phosphorus release, high pollutants that need to be reprocessed, easy sludge floating, etc., and achieve the reduction of floor space , delayed membrane fouling, easy operation and maintenance

Active Publication Date: 2012-08-22
TONGJI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separate gravity concentration is completed in an independent gravity concentration tank. The process is simple and effective, but there are also a series of problems, such as easy sludge floating, high pollutants in the supernatant that need to be reprocessed, anaerobic phosphorus release, etc.

Method used

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  • Multi-section plate membrane sludge concentration process method
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Embodiment 1

[0022] Example 1: figure 1 It is a schematic diagram of an embodiment of the present invention, and only takes four sections in series as an example, and does not limit the present invention.

[0023] The process of the present invention is set by the first reactor 1, the second reactor 2, the third reactor 3, and the fourth reactor 4 according to the push-flow operation mode of the liquid level difference, and the membrane water outlet system 5 and the flat plate are arranged in the above reactors. Membrane module 6 and aeration device 7, and a vent pipe 8 is set at the bottom of the reactor.

[0024] First of all, after the sludge enters the first reactor 1, the water in the sludge is separated by the membrane module 6, and is extracted out of the reactor by the membrane water outlet system 5, and the sludge is concentrated. At this time, due to the relatively high sludge concentration Low, the membrane effluent system 5 adopts a relatively large operating flux, and the aer...

Embodiment 2

[0029] The flat-panel membrane modules use PVDF and PAN, with a pore size of 0.2 μm. They are used to treat low-concentration residual activated sludge and are divided into four sections. The first reactor uses PAN flat-panel membrane modules, and the last three reactors use PVDF flat-panel membrane modules. 58 flat-plate membrane modules with a total membrane area of ​​42.34 m 2 . The membrane area of ​​the first reactor is 11.68 m 2 , the membrane areas of the second, third and fourth reactors are all 10.22 m 2 . The amount of mud entering is 7.8 m 3 / d, the hydraulic retention time is 6.8 h, the sludge concentration is about 3.4 g / L, and the operating flux of the first reactor is 16 L / (m 2 h), the operating flux of the second reactor is 9 L / (m 2 h), the operating flux of the third reactor is 5 L / (m 2 h), the operating flux of the fourth reactor is 2.5 L / (m 2 h), all adopt the operation mode of pumping for 10 minutes and stopping for 2 minutes. The sludge concent...

Embodiment 3

[0031] The flat membrane module adopts PVDF with a pore size of 0.2 μm to treat high-concentration excess activated sludge. It is divided into four sections. The total area of ​​the flat membrane module is 700 m 2 . The membrane area of ​​the first reactor 1 and the second reactor 2 are both 218.8 m 2 , the membrane area of ​​the third reactor 3 is 175 m 2 , the membrane area of ​​the fourth reactor 4 is 87.6 m 2 . The amount of mud entering is 200 m 3 / d, the hydraulic retention time is 6.8 h, the sludge concentration is about 10 g / L, and the operating flux of the first reactor 1 is 18.3 L / (m 2 h), the operating flux of the second reactor 2 is 10.5 L / (m 2 h), the operating flux of the third reactor 3 is 8 L / (m 2 h), the operating flux of the fourth reactor 4 is 4 L / (m 2 h), all adopt the operation mode of pumping for 10 minutes and stopping for 2 minutes. The sludge concentration in the first reactor is maintained at 18 g / L, the sludge concentration in the second ...

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Abstract

The invention relates to a multi-section plate membrane sludge concentration process method. A plurality of reactors are arranged according to a liquid level difference flow propelling operation way, large-particle-size sludge flocs are retained in the reactors by means of ultrafiltration (microfiltration) membranes, and clean water are pumped out of the reactors, so that sludge is separated fromwater. By means of the multiple reactors, plate membranes are in different operation fluxes under different sludge concentrations to protect the membranes from being polluted too fast. Further, an aerating device is used for flushing surfaces of the plate membranes, membrane pollution can be controlled, dissolved oxygen is provided for the reactors, nitrification in the reactors is promoted, anaerobic phosphorus release of the sludge can be prevented, and better membrane discharged water can be provided. Compared with a single-section plate membrane sludge synchronous concentration and nitrification process, the multi-section plate membrane sludge concentration process method has the advantages that the membrane utilization rate is higher, membrane pollution and energy consumption are lower, water outlet quality is better, and high economic and social benefits can be obtained.

Description

technical field [0001] The invention relates to a method for concentrating sludge, and relates to a technology for concentrating sludge in sewage treatment, in particular to a multi-stage flat membrane sludge concentrating process. Background technique [0002] With the progress of urbanization and the improvement of environmental quality standards, the sewage treatment rate and degree of sewage treatment are also increasing and deepening, and the output of sludge is also greatly increased. However, in our country, due to financial and technical reasons, the current level of sludge treatment lags seriously behind that of sewage treatment, that is, the phenomenon of "heavy water and light mud". The commonly used sludge treatment and disposal technology routes in China are concentration + dehydration + final disposal or concentration + digestion + dehydration + final disposal, and the way out for final disposal needs further research and planning. Sludge concentration is one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 吴志超王志伟麦穗海毛金炼朱学峰王盼蔵莉莉
Owner TONGJI UNIV
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