Method for preparing marsh gas and producing sintered bricks by using municipal sludge

Abstract

The invention relates to a method for preparing marsh gas and producing sintered bricks by using municipal sludge. The method comprises the following steps: supplying steam to a dry anaerobic fermentation tank from a steam boiler, carrying out dry anaerobic fermentation on the municipal sludge, and producing marsh gas and anaerobic fermentation sludge after fermenting; conditioning, modifying and dewatering the anaerobic fermentation sludge, supplying the anaerobic fermentation sludge to a drying device for drying, then crushing the anaerobic fermentation sludge to obtain dry sludge powder; mixing the dry sludge powder with building waste soil and producing brick blanks by extrusion molding; and supplying the brick blanks into a system for producing bricks by using sludge, drying and roasting to produce sintered bricks. The smoke in the system for producing bricks by using sludge can be simultaneously used as the heat source of the steam boiler and the drying device; the marsh gas produced after fermenting the municipal sludge can be used as a heating fuel of the system for producing bricks by using sludge. The method has the technical effects that almost no secondary pollution is generated when the municipal sludge is treated, and the comprehensive utilization of energy can be implemented.

Description

technical field [0001] The invention relates to solid waste treatment, disposal and resource utilization, in particular to a method for producing biogas and sintered bricks by using municipal sludge. Background technique [0002] The main purpose of sludge treatment and disposal is to reduce, stabilize and recycle sludge. At present, sludge reduction and stabilization are mainly achieved through solidification landfill, anaerobic digestion, aerobic composting and incineration. In the case of increasing shortage of global resources, the resource utilization and energy utilization of sludge should be the leading direction of sludge disposal. [0003] The high water content of sludge is an important factor hindering the resource utilization of sludge. The remaining sludge in sewage treatment plants generally still contains about 80% water after being concentrated, digested and mechanically dehydrated. Because there is a layer of extracellular polymers outside the sludge cell...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to avoid the problems of thermal drying and incineration of the sludge after deep dehydration in the prior art and the problems of high cost and serious secondary sludge to the environment, and at the same time avoid the problems of the existing dried sludge In order to solve the problem of mixing other raw materials in the production of sintered bricks, the organic matter content in the sludge is high, and it is difficult to press high pressure into dense bricks. A method for preparing biogas from municipal sludge and producing sintered bricks is proposed. There is basically no secondary pollution in the treatment, and the comprehensive utilization of energy is realized

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