Device and method for degrading excess sludge through pretreatment-EGSB-microorganism-electrochemistry integration

A microbial electrochemistry, -EGSB- technology, which is applied in electrochemical sludge treatment, chemical instruments and methods, electrochemical-biological combined treatment, etc., can solve problems such as secondary environmental pollution, achieve low treatment costs, and improve cracking efficiency. , good synergistic effect

Active Publication Date: 2016-05-04
NORTHEASTERN UNIV
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  • Abstract
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Problems solved by technology

[0002] With the continuous development of urban sewage treatment, the total amount of excess sludge has increased rapidly; since excess sludge contains a large a...

Method used

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  • Device and method for degrading excess sludge through pretreatment-EGSB-microorganism-electrochemistry integration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A pretreatment-EGSB-microbial electrochemical combined residual sludge degradation device, such as figure 1 As shown, it consists of crushing-anaerobic combined preprocessor, EGSB anaerobic processor 1, microbial electrochemical reactor 2 and gas collector 3;

[0039] Among them, the combined crushing-anaerobic preprocessor is composed of anaerobic reactor 4 and ultrasonic equipment 5, and ultrasonic equipment 5 can also be replaced by mechanical homogenizing equipment, high-pressure injection equipment and other crushing equipment; ultrasonic equipment 5 and other crushing equipment can be used as needed set inside or outside the anaerobic reactor 4;

[0040] The anaerobic reactor 4 is provided with a feed inlet 6, a discharge outlet 7 and a feed outlet 8; the EGSB anaerobic processor 1 is provided with a slurry inlet 9, a slurry outlet 10, a mud outlet 11, and a water outlet 12 , the water return port 13 and the exhaust port 15, in the present embodiment, the slurry ...

Embodiment 2

[0044] A pretreatment-EGSB-microbial electrochemical combined excess sludge degradation device, the structure is the same as that of Example 1, the difference is:

[0045] (1) The microbial electrochemical reactor 2 is an MFC reactor, and the reactor is externally connected to an electric energy collection device;

[0046] (2) The volume ratio of the anaerobic reactor 4 to the EGSB anaerobic processor 1 is 1:1.5; the cathode and anode poles of the MFC reactor are distributed at 1 / 2-3 / 4 of the height of the EGSB anaerobic processor 1.

Embodiment 3

[0048] Utilize the device of embodiment 1 to carry out the method for surplus sludge degradation, comprise the steps:

[0049] (1) Broken-anaerobic joint pretreatment

[0050] The excess sludge with a concentration of 20g / L is input into the crushing-anaerobic combined preprocessor from the feed port on the anaerobic tank, and the anaerobic sludge in the anaerobic reactor is used to anaerobically digest the excess sludge for a short time to kill A large number of aerobic microorganisms in the dead activated sludge change the properties of the sludge and reduce the difficulty of sludge cracking. The ratio of the mass of the remaining sludge to the anaerobic sludge is 2:1; at the same time, the ultrasonic wave of the crushing equipment is used to disperse the sludge Bacterial micelles break bacterial cells and decompose macromolecules. Ultrasound is a probe-type generating device with a frequency of 20KHZ. The time for each ultrasound is 0.5h, and the time interval between two u...

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Abstract

An objective of the invention is to process excess sludge to achieve reduction, harmlessness, and recycling of the sludge. The invention provides a device and method for degrading excess sludge through pretreatment-EGSB-microorganism-electrochemistry integration, and belongs to the technical filed of recycling and reduction of excess sludge. The device includes a crushing-anaerobic-digestion integrated pre-processor, an EGSB anaerobic processor, a microorganism electrochemical reactor, and a gas collector. The method comprises: performing anaerobic digestion and crushing on the sludge in anaerobic sludge to enable solid particles in a sludge suspending liquid to be crushed and partially dissolved in an aqueous phase and to form high-concentration organic waste water containing a certain amount of solid particles; degrading pre-treated sludge through anaerobic granular sludge in the EGSB anaerobic processor; and performing further degradation through microorganism electrochemistry. Through the device, the water content in sludge is made to satisfy an emission standard, and organic matters are released in a gas manner, such as CO2, CH4, and H2, thereby effectively improving the reduction and recycling efficiency of the excess sludge and achieving a harmlessness objective.

Description

technical field [0001] The invention belongs to the technical field of resource utilization and reduction of excess sludge, and in particular relates to an excess sludge degradation device and method combined with pretreatment-EGSB-microbial electrochemistry. Background technique [0002] With the continuous development of urban sewage treatment, the total amount of excess sludge has increased rapidly; since excess sludge contains a large number of organic matter such as microorganisms and suspended solids, if it is not properly treated and disposed of, it will cause secondary pollution to the environment. According to incomplete statistics, the annual sludge production in my country is more than 30 million tons, and it is increasing at an annual rate of 15%. The situation of sludge treatment is very severe. Therefore, the effective treatment of excess sludge has become a major problem that needs to be solved urgently, and it is of great significance to develop efficient slu...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/04C02F11/02C02F9/14
CPCC02F3/005C02F3/28C02F9/00C02F11/00C02F11/006C02F11/02C02F11/04C02F2301/08C02F2303/06Y02E50/30Y02W10/20
Inventor 朱彤李现瑾谢元华朱曜南
Owner NORTHEASTERN UNIV
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