Technique for producing synthetic fuel by sludge of municipal sewage plant

A technology for urban sewage and synthetic fuels, which is applied in the direction of fuel, solid fuel, biofuel, etc., can solve the problems of technical complexity, groundwater pollution, land occupation, etc., and achieve reduced investment and operating costs, large processing scale, and high haulage costs Effect

Inactive Publication Date: 2008-08-27
刘志刚 +1
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Problems solved by technology

According to experts, there are currently three methods of sludge disposal in the world: one is sanitary landfill, but it needs to occupy land. Practice has shown that a 50,000 m 2 The landfill pit is only enough for about 20 months, and it is easy to infiltrate various poisons into the ground, causing pollution to groundwater resources; the second is comprehensive utilization, but it can only be carried out after non-toxic and harmless treatment; the third is dry incineration , in Europe, the United States and Japan, most of the sludge disposal adopts incineration technology
In the sludge incineration treatment, the construction of the incineration boiler is the key technology, but the technology is complicated, and the investment and operation costs are expensive

Method used

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  • Technique for producing synthetic fuel by sludge of municipal sewage plant

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Embodiment Construction

[0024] The remaining sludge with a moisture content of more than 78% after dehydration in the urban sewage treatment plant is transported to the plant and transported to the sludge silo by a screw conveyor (Gongyi City, Henan Province Great Wall Machinery Factory) for storage. The sludge silo is a cylindrical silo (Putzmeister, Germany), with a hydraulically driven sludge carriage and a shaftless screw conveyor at the bottom to prevent sludge from agglomerating.

[0025] The sludge in the silo is sent to a stable mixing tank (Henan Hongxing Mining Machinery Co., Ltd., Zhengzhou) through a screw conveyor, and 10% of the sludge is added with CaO, and stirred for 10 minutes, which can separate and dehydrate 10% of the sludge. , can also play the role of sulfur fixation. Reduce the moisture content to 65% sludge; send the stabilized sludge to the deodorizing mixing tank through a screw conveyor (Henan Hongxing Mining Machinery Co., Ltd., Zhengzhou), and add 1.24% Fe of the sludge ...

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Abstract

The invention relates to a technological method which utilizes sludge from wastewater treatment plant to prepare synthetic fuel, which comprises the following steps: firstly, feeding sludge whose water content is 80% after being dewatered by a municipal wastewater treatment plant into a stable stirring tank, adding CaO which is 8-12% of the amount of sludge, stirring for 10 minutes, lowering water content to 65%, feeding sludge whose water content is lowered to 65% into a deodorant stirring tank, adding Fe2(SO4), FeSO4(NH4)SO4.6H2O, CuSO4, CO(NH2)2 and water to prepare mixed solution which is 5%, stirring and mixing for 5 minutes, leading sludge to be totally loosed and stable to be end product sludge, feeding 30-40% end product sludge, 40-50% coke foam and 20% coal gangue into an automatic batch hopper, simultaneously adding 0.05-0.1g Fe2O3, stirring, mixing for 5 minutes, and preparing synthetic fuel. The invention achieves innocent treatment and resource treatment of sludge, and achieves comprehensive utilization of coal making industry.

Description

technical field [0001] The invention belongs to solid waste reutilization technology, in particular to a method for producing fuel by using sludge from urban sewage treatment plants. Background technique [0002] Sludge from urban sewage treatment plants contains a large number of bacteria, viruses and heavy metal pollutants. How to dispose of them has always been a national environmental problem. According to experts, there are currently three methods of sludge disposal in the world: one is sanitary landfill, but it needs to occupy land. Practice has shown that a 50,000 m 2 The landfill pit is only enough for about 20 months, and it is easy to infiltrate various poisons into the ground, causing pollution to groundwater resources; the second is comprehensive utilization, but it can only be carried out after non-toxic and harmless treatment; the third is dry incineration , In Europe, the United States and Japan, most of the sludge disposal adopts incineration technology. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/46
CPCY02E50/10Y02E50/30
Inventor 刘志刚王安
Owner 刘志刚
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