Method and apparatus for source sludge reduction based on microwave sludge pretreatment

A pretreatment and microwave source technology, applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of increasing the difficulty of reactor design and production, unfavorable treatment technology and economicalization, and achieve easy Operation, reduced energy consumption, and less equipment investment

Inactive Publication Date: 2013-07-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the treatment condition of this microwave treatment method is a high-temperature airtight and pressurized environment. Generally, a good treatment effect can be achieved at a temperature of 120°C-170°C or even higher, which increases the difficulty of design and production of the reactor, and is not conducive to the economy of this treatment technology. change

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  • Method and apparatus for source sludge reduction based on microwave sludge pretreatment
  • Method and apparatus for source sludge reduction based on microwave sludge pretreatment
  • Method and apparatus for source sludge reduction based on microwave sludge pretreatment

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Experimental program
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Effect test

Embodiment 1

[0060] See figure 2 , the microwave sludge pretreatment device mainly includes a heat exchanger, a microwave reactor and a PLC automatic control system;

[0061] A reaction vessel 7 is built in the furnace cavity 6 of the microwave reactor with PLC control system 5 and microwave source 13 (configuration 2450MHz or 915MHz microwave source), on the furnace cavity wall of the microwave reactor There is an inlet 1 for inorganic lye or inorganic acid and a dosing port 2 for hydrogen peroxide, and the inlet 1 for the inorganic lye or inorganic acid and the dosing port 2 for hydrogen peroxide are respectively Connect with the inlet of the inorganic lye or the inorganic acid solution that has on the wall of described reaction vessel 7 and the dosing port of hydrogen peroxide through pipeline; Also have sludge on the wall of described reaction vessel 7 feed inlet 3 and sludge outlet 4, and the sludge inlet is higher than the sludge outlet;

[0062] The heat exchanger is arranged out...

Embodiment 2

[0070] (1) Concentrating the residual activated sludge of 10g / L-20g / L obtained by utilizing the oxidation ditch method to treat sewage in urban sewage treatment plants to a mud-water mixture with a concentration of 25g / L-30g / L;

[0071] (2) The mud-water mixture obtained in step (1) is preheated through a heat exchanger and then transported to a microwave reactor (the microwave reactor is configured with a microwave source of 2450MHz or 915MHz), and the mud-water is mixed with HCl aqueous solution After the pH of the liquid is adjusted to 3, it is preheated by a heat exchanger and then transported to a microwave reactor;

[0072]Turn on the microwave source of the microwave reactor, stir the mud-water mixture in the microwave reactor while heating it with microwave radiation, and heat the mud-water mixture to a temperature of 60-70°C at a heating rate of 5-20°C / min , turn off the microwave source of the microwave reactor, temporarily stop microwave radiation heating, add hydro...

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Abstract

The invention belongs to the field of solid waste treatment and resource recycle and reuse, relates to a technology for excess sludge reduction, and particularly relates to a method and an apparatus for source sludge reduction based on microwave sludge pretreatment. The method provided by the invention comprises the steps of adjusting a pH value of a water-sludge mixed solution obtained by concentrating the excess active sludge to 2.5-12; efficiently cracking the excess active sludge through microwaves under normal pressure opening conditions to increase bio-availability of the excess active sludge; and then reflowing the sludge obtained by the microwave sludge pretreatment to an active sludge tank to realize source reduction of the sludge. The apparatus provided by the invention mainly comprises a heat exchanger, a microwave and a PLC control system. The method is simple, short in process flow and high in efficiency, can realize the source sludge reduction. The apparatus is low in investment and is suitable for the pretreatment of the excess sludge of sewage treatment works in small and medium-sized cities.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and resource recovery and reuse, and relates to a technique for reducing excess sludge, in particular to a method and device for reducing sludge at source based on microwave sludge pretreatment. Background technique [0002] With the development of social economy, the increase of the total amount of sewage treatment and the improvement of treatment standards, a large amount of surplus activated sludge (abbreviated as surplus sludge or sludge) has been produced in urban sewage plants. The high cost and other problems caused by its treatment and disposal have become a serious burden on the normal operation of sewage treatment plants. Therefore, the cost-effective treatment and disposal of excess activated sludge has become an urgent and severe challenge. [0003] In the process of sludge reduction, recycling and harmlessness, the researchers found that the surplus sludge, which is the burden of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 魏源送肖庆聪王亚炜阎鸿
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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