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City sewage sludge reclamation processing and utilization method

A municipal sludge recycling technology, applied in the field of recycling municipal sludge, can solve the problems of increased pulping cost, increased process links, unsuitable for large-scale and commercial promotion and application, and achieves significant environmental benefits, The effect of saving coal and water resources

Inactive Publication Date: 2010-01-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: 1. The finished product coal-water slurry needs to be used, which leads to an increase in process links, thereby increasing the cost of pulping; 2. The sludge coal-water slurry prepared according to the method is difficult to fully meet GB in terms of performance indicators. / T18855-2002 "Technical Conditions for Coal Water Slurry", not suitable for large-scale and commercial promotion and application

Method used

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  • City sewage sludge reclamation processing and utilization method

Examples

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Effect test

Embodiment 1

[0016] Example 1: Coal with a calorific value of 26.82MJ / kg, volatile matter of 33.61%, fixed carbon of 54.19%, and ash content of 10.49% and a city with a moisture content of 78.50%, volatile matter of 37.25%, fixed carbon content of 5.44%, and ash content of 57.31% sludge.

[0017] Mix 5 parts of urban sludge and 62 parts of coal for ball milling, add 0.5 parts of lignosulfonate dispersant and 32.5 parts of water during the ball milling process to obtain 0.07% of the particle size greater than 300 microns and less than 75 microns It is 81.86% of the crude coal water slurry of sludge; after the slurry is discharged, it is left to stand for 10 minutes, and a carboxymethyl cellulose stabilizer of 0.6% to 0.7% of the total weight of the crude coal water slurry of the sludge is added to obtain a concentration of 61.95%, and the ash content 7.16%, sulfur 0.40%, volatile matter 37.02%, calorific value of 17.44MJ / kg finished coal water slurry. It is transported to the coal-water sl...

Embodiment 2

[0018] Example 2: Coal with a calorific value of 26.72MJ / kg, 34.08% volatile matter, 53.93% fixed carbon, and 11.14% ash content and a city with a moisture content of 78.13%, 39.43% volatile matter, 11.18% fixed carbon, and 49.36% ash content sludge.

[0019] Mix 10 parts of municipal sludge and 60 parts of coal for ball milling, add 0.75 parts of polycarboxylate dispersant and 29.3 parts of water during the ball milling process to obtain 0.09% of the particle size greater than 300 microns and less than 75 microns It is 81.67% of the crude coal water slurry; after the slurry is discharged, it is allowed to stand for 15 minutes, and 0.6% to 0.7% of the total weight of the crude coal water slurry is added to obtain a concentration of 60.57%, and the ash content is 7.49%. The finished coal water slurry has a sulfur content of 0.43%, a volatile content of 37.32%, and a calorific value of 17.02MJ / kg. It is transported to the coal-water slurry boiler for combustion, and its burnout...

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Abstract

The invention discloses a method for the resourceful treatment and utilization of the municipal sludge. The invention is that the municipal sludge with 75 percent to 85 percent water content with the coal powder is grinded by a wet ball mill to obtain the mixing granules which accord with the gradation requirements; and the coarse product of the sludge coal water slurry is produced through the addition of the water and dispersant agent according to the technical proportion; the stabilizer is added after 10 minutes standing of the slurry; and the finished product of the sludge coal water slurry is produced, which is in accordance with the GB / T18855-2002 Coal Water Slurry Technical Condition; the finished product of the sludge coal water slurry is transported to the coal water slurry boiler, which is burned as the fuel for the treatment and utilization of the municipal sludge. The slurry production technique is simple, which suits for the industrialized mass production; the product is suitable for the common coal water slurry boiler, which replaces part of the using coal and using water of the coal water slurry while effectively utilizing the heat value of the sludge. The invention can save the coal resource and the water resource, which is an economical and mature on the technology method for the resourceful treatment and utilization of the municipal sludge.

Description

technical field [0001] The invention relates to a method for resource utilization of solid waste. Specifically, municipal sludge and coal powder are combined with a dispersant to produce sludge coal-water slurry by wet ball milling, and the coal-water slurry is burned to obtain resources. A method of chemically treating and utilizing municipal sludge. Background technique [0002] At present, the annual discharge of dry sludge from sewage treatment plants in my country is about 550×10 4 ~600×10 4 tons, of which the annual discharge of dry sludge from urban sewage treatment plants is about 50×10 4 tons, and is growing at a rate of more than 10% every year. For example, there are two urban sewage treatment plants in Hangzhou, Sibao and Qige (with a total daily sewage treatment capacity of 1.1 million m3) 3 , of which the secondary biochemical treatment scale is 900,000 m 3 ), the daily output of sludge (moisture content 75-85%) is about 600 tons. Due to the huge amount, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G7/14F23K1/02
Inventor 胡勤海朱妙军余伟周海能王丹
Owner ZHEJIANG UNIV
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