Novel method used for recycling urban industrial sludge

Abstract

The invention discloses a novel method used for recycling urban industrial sludge. The novel method comprises following steps: water content of urban industrial sludge obtained via sewage treatment plant mechanical dewatering is reduced to 50 to 65% using a drying device, wherein an independent heat source or gas waste heat is adopted by the drying device as a heat source; the dewatered sludge, an auxiliary material, and a certain amount of an additive are mixed at a certain ratio, wherein the above materials are delivered into corresponding feed hoppers, and automatic induction weighing machines arranged under the feed hoppers are used for realizing material automatic compounding measuring; an obtained mixture is delivered into a blender for stirring, is conveyed using a conveying belt, and is made into material balls via twisting; the material balls are delivered into a rotary kiln with a certain gradient for calcination, wherein with rotating of the rotary kiln, the material balls roll to a kiln head, 2mm bran is sprayed into the rotary kiln for combustion, and the material balls are transformed into ceramsite via calcination in the kiln; and at last the obtained ceramsite is subjected to drying, natural cooling, sieving and grading, and finished product pre-delivery inspection. The novel method possesses following advantages: waste sludge is changed into valuable things, sludge treatment mode is widened, and sludge is cheap, so that enterprise cost is reduced.

Description

Background technique [0001] Urban industrial sludge (hereinafter referred to as "industrial sludge") mostly comes from urban industrial sewage treatment plants. Sludge is an accessory after sewage treatment. It is a kind of bacteria, inorganic particles, organic debris, An extremely complex heterogeneous body composed of colloids and the like. Sludge not only contains rich organic matter, nutrients and various trace elements, but also contains many toxic and harmful substances such as heavy metals that are difficult to degrade. [0002] Regarding the development of my country's sludge treatment industry today, relevant analysis reports in the past few years have pointed out that in 2010, the treatment rate of urban sewage in my country has reached 72%, but the harmless treatment rate of sludge is lower than 25%. traditional landfill. In 2012, my country's urban domestic sewage discharge was 46.27 billion tons. According to the calculation of 0.05%-0.08% mud content, the sludg...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to effectively alleviate the current problems of urban industrial sludge treatment by proposing a new method for resource utilization of urban industrial sludge