Technique for producing synthetic fuel by sludge of municipal sewage plant

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...

AI Technical Summary

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

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