Bio-drying and dehumidifying coupled heat-pump flap tower type sludge drying process and system thereof

Abstract

The invention discloses a bio-drying and dehumidifying coupled heat-pump flap tower type sludge drying process and a system thereof. On one hand, the process comprises a sludge pretreatment step, so as to obtain sludge with the moisture content of 62-70%, wherein the sludge pretreatment step comprises the steps: (1) adding inoculation strains and a conditioner into the sludge with the moisture content of 62-70%, and feeding into a fermentation chamber; (2) carrying out biological aerobic fermentation treatment on the inoculation strain added sludge in the fermentation chamber for 3-10 days, and controlling the temperature of the fermentation chamber to 40-62 DEG C and the humidity of the fermentation chamber to 45-55%; (3) shipping out the sludge subjected to the biological aerobic fermentation treatment from the interior of a vertical fermentation tower, wherein the moisture content of the sludge subjected to the biological aerobic fermentation treatment is 30-50%. On the other hand, the invention further provides the system for realizing the process. The process and system disclosed by the invention have the advantages that the sludge drying effect is good, the energy consumption is low, the process and the system are suitable for continuous operation, and the like.

Description

technical field [0001] The invention relates to a dehydration and drying method for an organic water-containing urban sewage treatment plant, belonging to the field of solid waste treatment, in particular to a biological drying coupling dehumidification heat pump turnover tower sludge drying process, and a biological drying coupling dehumidification heat pump turnover process Plate tower sludge drying system. Background technique [0002] With the rapid increase of sewage treatment volume, sludge production has increased rapidly. Sludge is highly viscous and water is difficult to remove. After gravity concentration and mechanical dehydration, the water content is still as high as 85%. The cost of its treatment and disposal accounts for the operating cost of the entire sewage plant and increases year by year. The treatment and disposal of sludge has become a difficult point in the environmental field. . [0003] Sludge has a high content of organic matter and has high econo...

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Problems solved by technology

[0004] At present, sludge drying mainly adopts the method of physical thermal drying, which needs to consume fossil fuels. For direct thermal drying, the drying residence time is long, the energy consumption is large, and the thermal efficiency is not high. At the same time, a large amount of tail gas is generated, which causes a burden for subsequent treatment. In addition The binding force of various water and sludge particles is quite different, and its drying characteristics are different from those of crystals, resulting in thermal drying of the partition wall, sludge is easy to agglomerate and stick to the wall, resulting in a sharp drop in heat transfer efficiency, and the energy consumption of thermal drying is too high , high operating cost in actual engineering

[0005] In addition, in recent years, sludge drying by biological aerobic drying process has also emerged. This biological aerobic drying process is a relatively economical sludge drying method, but the operating conditions of the biological process will vary with the nature of the sludge and climatic conditions. If the biological aerobic drying process changes, if the operating conditions of the biological aerobic drying process cannot adapt to the properties of the sludge and the local climatic conditions, a good drying effect cannot be obtained. Select the appropriate drying process to obtain the best process combination. For It is necessary to realize the optimization of the sludge treatment system

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