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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 process links, increased pulping costs, unsuitable for large-scale and commercial promotion and application, and saves coal and water Significant effect on resource and environmental benefits

Inactive Publication Date: 2008-09-24
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Effect test

Embodiment 1

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

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

Embodiment 2

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

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

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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 the resource treatment and utilization of solid waste, in particular to prepare the sludge coal-water slurry by using a wet ball milling process under the coordination of a dispersant with urban sludge and coal powder, and use coal-water slurry combustion to generate resources The method of chemical treatment and utilization of municipal sludge. Background technique [0002] At present, my country’s sewage treatment plants discharge about 550×10 dry sludge every year 4 ~600×10 4 Tons, of which the annual dry sludge discharged by the municipal sewage treatment plant is about 50×10 4 Tons, and is growing at a rate of more than 10% every year. For example, Hangzhou has two urban sewage treatment plants (Sibao and Qige) (a total of 1.1 million m2 of sewage treatment capacity per day) 3 , Of which the scale of secondary biochemical treatment is 900,000 m 3 ), the daily output of sludge (with a moisture content of 75-85%) is ...

Claims

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Application Information

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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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