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Dewatering sludge alkaline type semi-desiccation processing method of sewage treatment plants

A sewage treatment plant, dewatered sludge technology, applied in the direction of dewatering/drying/concentrated sludge treatment, etc., can solve the limitation of the popularization and application of sludge thermal drying technology, the difficulty in controlling leachate and odor, and the volume of drying device. huge problems, so as to achieve social and economic benefits, reduce the total number of coliform bacteria and bacteria, and achieve good economic results

Inactive Publication Date: 2010-06-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After decades of development, thermal drying has formed a mature process and equipment, which has the advantages of small footprint, short processing cycle, fully automatic operation, stable operation, etc., but it also has the advantages of large unit investment, operating cost and energy efficiency. The shortcomings of high energy consumption, and there are safety hazards such as dust explosions, which limit the promotion and application of sludge thermal drying technology in my country
[0014] Sludge biological drying technology has low cost and simple equipment, but it generally has disadvantages such as long reaction time, bulky drying device, low drying efficiency, and difficulty in controlling leachate and odor.

Method used

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Embodiment 1

[0029] A method for alkaline semi-dry treatment of dewatered sludge in a sewage treatment plant. The steps of the method are as follows. Lime is selected as the alkaline material, and the dewatered sludge is treated by the activated sludge method. The water content is 84.38%. Mud = 0.02:1 ratio Put lime and dewatered sludge into a spiral propulsion mixer, stir for 30 minutes, stir evenly, and stack naturally for 7 days to obtain treated sludge.

[0030] The moisture content of the treated sludge is reduced to 40.01% on the 7th day, which can meet the water demand for the sludge to be filled in domestic waste landfill or composted. Compared with other heating and drying methods, it can save 5 to 10 times the cost to achieve the same effect.

Embodiment 2

[0032] A method for alkaline semi-dry treatment of dewatered sludge in a sewage treatment plant. The steps of the method are as follows. Lime is selected as the alkaline material, and the dewatered sludge is treated by the activated sludge method. The water content is 84.72%. Mud = 0.1:1 ratio Put lime and dewatered sludge into a spiral propulsion mixer, stir for 25 minutes, stir evenly, and stack naturally for 7 days to obtain treated sludge.

[0033] The moisture content of the treated sludge is reduced to 32.25% on the 7th day, which can meet the water demand of the sludge entering the domestic waste landfill for landfill, incineration, composting and other disposal. Compared with other heating and drying methods, it can save 4 to 9 times the cost to achieve the same effect.

Embodiment 3

[0035] A method for alkaline semi-drying treatment of dewatered sludge in a sewage treatment plant. The steps of the method are as follows. The alkaline material is selected from fly ash, and the dewatered sludge is treated by activated sludge method. The water content is 81.91%. According to the weight ratio of fly ash: Dewatered sludge = 0.05:1 ratio Put fly ash and dewatered sludge into a spiral propulsion mixer, stir for 30 minutes, stir evenly, stack naturally for 7 days, and obtain treated sludge.

[0036] The moisture content of the treated sludge was reduced to 40.34% on the 7th day, which can meet the water demand of the sludge to be landfilled or incinerated, composted, etc. in the domestic waste landfill. Because fly ash is waste from incineration plants, compared with other heating and drying methods, it can save 10 to 13 times the cost to achieve the same effect.

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Abstract

The invention discloses a dewatering sludge alkaline type semi-desiccation processing method of sewage treatment plants, which belongs to the technical field of solid waste disposal. Alkali materials and dewatering sludge are added into a mixer according to the weight ratio that the alkali materials: dewatering sludge equals to 0.02 to 0.1: 1, wherein the alkali materials comprise lime and pulverized fuel ash or fly ash, the mixer is a screw type propulsion mixer, and after mixing and natural placing, the processed sludge can be obtained. The method has the characteristics of low price, low consumption, simplicity, high efficiency and the like, and realizes the mutual benefits of social benefit and economic benefit.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal, in particular to an alkaline semi-drying treatment method for dewatered sludge in a sewage treatment plant. Background technique [0002] According to statistics, as of the end of March 2008, 1,320 urban sewage plants have been put into operation across the country, with a treatment capacity of 97.25 million tons per day, and 890 urban sewage plants are under construction, with a treatment capacity of 36.39 million tons per day. According to the calculation of 1.5 tons of dewatered sludge produced by 10,000 tons of sewage, the current annual output of dry sludge in my country is 5.32 million tons, and the wet sludge with a moisture content of 80% is 26.62 million tons. [0003] According to the Eleventh Five-Year Plan, by 2010, the national dry sludge output will reach 5.7 million tons per year, and wet sludge with a moisture content of 80% will be 28.5 million tons per year. While t...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 蒋建国李春萍杨世辉杜雪娟
Owner TSINGHUA UNIV
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