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Method for preparing lightweight materials from municipal dewatered sludge through water glass and microwave dual curing

A technology of dewatering sludge and dual solidification, applied in water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, chemical instruments and methods, etc., can solve the problems of poor microwave oven equipment and achieve sludge volume reduction Large amount, low cost, and efficient effect of reducing organic matter

Active Publication Date: 2016-10-26
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of sludge used in these testing experiments is generally about 30ml. The microwave ovens used are simple and simple, and some even use household microwave ovens. Industrial sludge microwave extraction has not been reported yet.

Method used

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Embodiment Construction

[0030] The principles and features of the present invention are described below, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0031] Microwave energy is a new type of green energy. Under the action of alternating microwave electric field, the polar material molecules change with the change of electromagnetic field. Microwave radiation and high-frequency electromagnetic waves penetrate the extraction medium and reach the internal vascular bundles and glandular system. The characteristics of microwave heating are as follows:

[0032] a. Penetrating heating, fast heating speed. The distance it penetrates is theoretically on the same order of magnitude as the wavelength of electromagnetic waves. Microwave heating is to make the heated object itself a heating object, which is called the overall heating method, and does not require the process of heat conduction, so it can be heated in a ...

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Abstract

The invention relates to a method for preparing lightweight materials from municipal dewatered sludge through water glass and microwave dual curing and belongs to the field of environmental geotechnics. The method comprises the following steps: (1) adding 0.01-1 part (by weight) of photocatalyst, 0.1-2 parts (by weight) of extractant, 1-10 parts (by weight) of wave absorbing agent, 0.1-10 parts (by weight) of excitant, 0.1-20 parts (by weight) of alkaline curing agent and 0.001-2 parts (by weight) of heavy-metal curing agent into 100 parts (by weight) of the municipal dewatered sludge; (2) mixing the municipal dewatered sludge with the added photocatalyst, extractant, wave absorbing agent, excitant, alkaline curing agent and heavy-metal curing agent; (3) treating the mixed municipal dewatered sludge into granular municipal dewatered sludge; and (4) subjecting the sludge to microwave-photocatalysis integrated treatment in a microwave oven. The method has the advantages that organic matters are efficiently reduced, heavy metals are cured, the decrement of volume of the sludge is large, and the like; and the waste is changed into the valuable, and the situation that municipal sludge treatment is severe in situation at present can be greatly relieved.

Description

technical field [0001] The invention belongs to the field of environmental geotechnical engineering, and in particular relates to a method for preparing light-weight materials through microwave double solidification of municipal dewatered sludge and water glass. Background technique [0002] Municipal dewatered sludge is the main by-product of sewage treatment, and its production volume has increased sharply. Many cities have formed a trend of "sludge siege". Municipal dewatered sludge has the characteristics of large capacity and instability. The solid organic matter in it is due to the content of It is as high as 38%, and has a large molecular weight, high boiling point, and is difficult to degrade. It is particularly prone to corruption and becomes foul-smelling. pollution accident. [0003] The development of municipal dewatered sludge treatment technology, process and equipment is still restricted by the development of economic level, and the idea of ​​"heavy water and...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/10C02F11/12
CPCC02F11/004C02F11/008C02F11/06C02F11/10C02F11/12C02F2305/10
Inventor 薛强汪华方韩俭陈亿军曾刚肖凯
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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