Low consumption highly effective sludge drying method

A sludge drying and high-efficiency technology, which is applied in chemical instruments and methods, sludge treatment, sludge treatment, etc., can solve the problems of low thermal efficiency, high odor concentration, sludge cementation and wall sticking, etc., and achieve high thermal efficiency, Reduce energy consumption and avoid explosion effects

Inactive Publication Date: 2007-08-08
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct drying usually uses hot air or waste flue gas, which not only has low thermal efficiency (about 30%), but also produces a large amount of tail gas. The concentration of odor in the tail gas is high, and deodorization treatment is necessary
Indirect drying is prone to sludge cementation and sticking to the wall

Method used

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  • Low consumption highly effective sludge drying method

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Effect test

Embodiment 1

[0026] A sewage treatment plant with a scale of 100,000t / d, using this technology, the proportion of concentrated sludge entering the anaerobic digester is 100%, and the daily production of biogas is 5000m 3 , All used to generate superheated steam (combustion tail gas is used to generate steam, and combustion is used to superheat the steam), the thermal efficiency can reach 80%; the moisture content of digested sludge after dehydration is about 75%, and it enters the superheated steam drying system. The superheated steam drying heat efficiency is 90%, the outlet sludge moisture content is 60%, and the energy balance is calculated as follows. The entire system can realize energy self-balance without additional heating, only power consumption, low energy consumption, and high efficiency. The dried export sludge can be used for composting or making synthetic fuel, making full use of the organic matter in it.

[0027]

Embodiment 2

[0029] A sewage treatment plant with a scale of 30,000t / d, all the concentrated sludge enters the medium temperature anaerobic digestion tank, with a daily production of 1,050m methane 3 , All used to generate superheated steam, the thermal efficiency can reach 80%; the moisture content of the digested sludge after dehydration is about 75%, and it enters the superheated steam drying system, the superheated steam drying thermal efficiency is 90%, and the outlet sludge moisture content is 10%. The energy balance is as follows. In addition to biogas combustion for heating, the entire system needs to burn about 8t of coal (coal combustion efficiency is calculated at 30%). If the unit price of coal is 200 yuan, the treatment cost per ton of wet mud is about 50 yuan. The dried export sludge becomes granular and can be directly used for incineration to generate electricity. The calorific value of the dried sludge is calculated at 10MJ / kg, and the daily power generation capacity is 4000 d...

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Abstract

The invention discloses a low-consumption high-effective sludge drying method in the solid waste disposing technical domain, which is characterized by the following: introducing condensed sludge at certain proportion into anaerobic digestion tank; adopting partial methane from digestion tank to generate overheat steam and other methane to burn or generate power; making digestive sludge into mechanic hydrolytic chamber; introducing hydrolytic sludge into overheat steam drying device; evaporating water in the sludge; dehydrating; sterilizing; refluxing overheat steam into anaerobic digestion tank; circulating overheat steam after condensing and deodorizing.

Description

Technical field [0001] The invention relates to a low-consumption and high-efficiency sludge drying method, which belongs to the technical field of solid waste disposal, and particularly relates to a method for reducing and reusing the surplus sludge produced by a municipal sewage treatment plant. Background technique [0002] With the development of the economy and the improvement of people's living standards, the amount of domestic sewage produced in our country is increasing year by year. At the same time, as the urban sewage treatment system becomes more and more perfect, the sewage collection rate and treatment rate are also rapidly increasing. Activated sludge method is still a commonly used sewage treatment method in urban sewage treatment plants, and this method will produce a large amount of excess sludge. According to statistics, at present, my country's urban sewage plants discharge about 1.3 million tons of dry mud each year, and the annual growth rate is 10%. Accordi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04C02F11/12
CPCY02E50/343Y02E50/30Y02W10/20
Inventor 蒋建国杜雪娟张群芳
Owner TSINGHUA UNIV
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