Sludge reduction and desiccation combination method

Abstract

The invention relates to a sludge reduction and desiccation combination method. Sludge with a moisture content of 99% in a secondary sedimentation tank is inputted into a sludge hydrolysis digestion reactor internally provided with a filler layer, in the reaction conditions of full stirring, sludge floc cell wall is broken for sludge liquefaction to realize sludge and water separation, an acidizing fluid discharging from the top of the filler layer flows back to flooding water of a sewage plant for carbon source recycling, the sludge reduction rate can reach 20-60%; after first dehydration, the reduced sludge is modified for cell wall disruption, and then is dehydrated by secondary pressing, and finally the moisture content of the sludge is reduced to 20%-30% by continuous desiccation reaction. According to the method, the sludge output can be reduced from the source, the sludge desiccation treatment cost can be saved, the sludge after desiccation treatment is not easy to rot and is good in stabilizing effect, and the method can be widely used in the treatment and disposal of residual sludge in the sewage plant, and finally realizes the reduction and resource utilization of the residual sludge.

Description

technical field [0001] The invention relates to a sludge reduction and drying combined method, which can realize sludge reduction and resource utilization, and belongs to the technical field of sludge treatment and disposal. Background technique [0002] With the construction and operation of sewage treatment plants in various parts of my country, the sludge produced has also increased significantly. As of the end of 2012, the total annual sludge production in the country exceeded 30 million tons. According to forecasts, by 2020, the amount of sludge will exceed 60 million tons per year. Since harmful substances such as organic matter, heavy metals, and pathogenic microorganisms contained in wastewater may be concentrated in the sludge immediately after treatment, if the sludge is not properly disposed of, it will inevitably cause more serious pollution to the environment. In addition, in the process of sewage biological treatment, the microbiota contacts with the organic m...

AI Technical Summary

Problems solved by technology

, but this process has disadvantages such as large equipment area, complex system, long pressing time, inability to continuously discharge materials, high site requirements (need to set up a raised platform), ferric chloride corrosion, etc.

[0009] The above sludge treatment and disposal methods and devices all solve the problems of large sludge output and high sludge moisture content, but the reduction and drying of excess sludge still need to consider whether the environment is friendly, cost, energy consumption, land occupation and treatment effect etc. Therefore, choosing an economical and environmentally friendly sludge reduction and drying technology is the key to sludge treatment and disposal, so that the moisture content of sludge can be further reduced to below 60%, so as to realize resource utilization

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