Solid fuel prepared from sewage plant sludge and preparation method and application thereof

Abstract

The invention relates to a solid fuel prepared from sewage plant sludge. Raw materials of the solid fuel comprise the sewage plant sludge of which the water content is 50-90 wt% and brown coal powderof which the particle size is less than or equal to 3 mm, wherein water content of the brown coal powder is less than or equal to 25 wt%, and a weight ratio of the sewage plant sludge and the brown coal powder is 1: (1 to 10). The invention further relates to a preparation method and application of the solid fuel.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of solid waste resources, in particular to a solid fuel prepared from sewage plant sludge and its preparation method and application. Background technique [0002] With the modern expansion and development of cities, the social population is gradually concentrated in large and medium-sized cities, coupled with the significant improvement in sewage treatment efficiency, the output of urban sludge will increase rapidly, and the pressure on urban sludge treatment is increasing. [0003] After the country promulgated the "Water Ten Measures" in 2015 and sounded the clarion call for mud control, in February 2016, the Ministry of Environmental Protection and the Ministry of Housing and Urban-Rural Development jointly issued a document requiring that sludge treatment and disposal be included in the unified supervision of urban sewage treatment and emission reduction. The policy, which includes sl...

AI Technical Summary

Problems solved by technology

Chinese patent application CN101250456A mentions a process for making synthetic fuel by using sludge from urban sewage treatment plants, and sending the sludge with a moisture content of 75 to 80% obtained from urban sewage treatment plants into a stable stirring tank , add 8-12% of the amount of CaO in the sludge, stir for 10 minutes, and reduce the moisture content to 65%; send the sludge with a moisture content to 65% to the deodorizing mixing tank, and add Fe 2 (SO 4 ), FeSO 4 ·(NH 4 ) SO 4 ·6H 2 O, CuSO 4 and other chemicals to loosen and stabilize the sludge and mix it with other carbon-containing substances to make fuel. A variety of chemicals are added during the treatment process, and the process is complicated

However, its disadvantages are high energy consumption, cumbersome steps, and low sludge treatment volume.

Chinese patent application CN1282781A proposes a method for preparing sludge briquettes. Coal powder, sludge, wood chips or powder, and desulfurization and deodorant are mixed in a wet state according to a certain component ratio, and then pressed into briquettes. The added sludge component replaces clay as the briquette binder. This method still uses coal as the main raw material. The amount of sludge added is relatively small, and the effect of sludge recycling is not good.

In order to prevent the lignite powder from being blown away by the strong wind, some manufacturers use a large amount of water to wet it for a long time. As a result, the pollution is not reduced but water resources are wasted again

These shocking wastes have not only seriously caused a serious waste of resources, but also caused serious pollution of the regional environment.