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Sludge drying and resource disposal process

A sludge drying and sludge technology, applied in sludge treatment, biological sludge treatment, sewage/sludge fertilizer, etc., can solve the problems of small land occupation, high product volume treatment cycle, high unit investment, high operating cost, etc. Achieve the effects of improving land utilization, improving fermentation efficiency, and reducing dehydration costs

Inactive Publication Date: 2006-04-26
吴为中 +1
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AI Technical Summary

Problems solved by technology

[0006] The above-mentioned thermal drying treatment technology has the advantages of small footprint, small product volume, short treatment cycle, not affected by weather, full automatic control and stable operation, but at the same time there are high unit investment (100,000-150,000 yuan / T) and High energy consumption (3100~3500kj / kgH 2 O) and other shortcomings
Its operating cost is relatively high. On average, 6T of water can be removed by heat for every fuel equivalent to 1T of oil consumed, that is, 0.667T of oil / T of dry sludge is consumed for thermal drying of dewatered sludge with a moisture content of 80%. On average, every 1kw of electricity consumed can remove 2kg of water through heat, that is, thermal drying of dewatered sludge with a moisture content of 80% requires 2000kw of electricity / T dry sludge

Method used

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  • Sludge drying and resource disposal process

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Effect test

Embodiment 1

[0034] Processing technology of the present invention carries out according to the following steps:

[0035] (1) put the sludge of urban sewage treatment plant with a moisture content of 80% into a belt-type industrial microwave processor for pretreatment of wall breaking, disinfection and sterilization, and the treatment time is 3-5 minutes;

[0036] (2) put the pretreated sludge into a belt filter press for dehydration treatment, and the moisture content of the sludge can be reduced to 65%;

[0037] (3) Add special strains (0.1%), reflux sludge (10%) and conditioner (accounting for 30%) to the dehydrated sludge in a certain proportion to form a fermentation material, and use a large Stir with a mixer;

[0038] (4) Put the fermentation material into a closed sludge fermentation tower capable of continuous production for high-temperature aerobic fermentation. 5-7d fermented sludge is matured, the moisture content of the sludge is 40%, and the texture is loose and easy to bre...

Embodiment 2

[0044] Processing technology of the present invention carries out according to the following steps:

[0045] (1) put the sludge of urban sewage treatment plant with a moisture content of 80% into a belt-type industrial microwave processor for pretreatment of wall breaking, disinfection and sterilization, and the treatment time is 3-5 minutes;

[0046] (2) put the pretreated sludge into a belt filter press for dehydration treatment, and the moisture content of the sludge can be reduced to 60%;

[0047] (3) Add special strains (0.1%), reflux sludge (10%) and conditioner (accounting for 10%, particle size 20mm to 30mm) to the dehydrated sludge in a certain proportion to form a fermentation material, and stir it with a large mixer Uniform;

[0048](4) Put the fermentation material into a closed rotary fermenter that can be continuously produced for high-temperature aerobic fermentation. The diameter of the fermenter is 3m, the length is 30m, the speed is 0.2r / min, and the sludge ...

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Abstract

The present invention relates to environment protecting technology, and is especially one kind of sludge drying treatment process. The present invention is one low-cost combined sludge drying and utilizing process integrating microwave technology, aerobic fermentation technology and heat pump drying technology. The present invention is suitable for treatment of different kinds of sludge, and the sludge product has wide applications, including use as organic fertilizer, use as the material for composite organic fertilizer and building material, use as fuel for incinerating garbage and heating boiler, etc.

Description

technical field [0001] The invention relates to the technical field of environmental protection, and to sludge treatment technology, in particular to a sludge drying process. Background technique [0002] Sludge here refers to sludge from urban sewage treatment plants or sludge from eutrophic rivers and lakes. Its common characteristics are high content of organic matter, fine particles, flocculent colloidal structure, high hydrophilicity, but dehydration Poor performance. [0003] The output of sludge is huge. Although it has the value of resource utilization, it also contains harmful substances, which poses a high risk of stacking or landfill, and high treatment and disposal costs. Therefore, how to use sludge safely, economically and scientifically has become a research topic of great concern to all countries in the world today. [0004] At present, the sludge treatment and disposal methods mainly include sanitary landfill reduction, incineration, fertilizer manufacturi...

Claims

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Application Information

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IPC IPC(8): C02F11/12B09B3/00C02F11/02C05F7/00
CPCY02A40/20Y02P20/129Y02W10/20
Inventor 吴为中李旭海
Owner 吴为中
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