System and method for treating excess sludge in urban domestic sewage

Abstract

The invention provides a sludge treatment system. The sludge treatment system comprises an electrolytic mixing tank, an anaerobic fermentation tank and an aerobic composting tank which are sequentially communicated through pipelines, wherein an anode plate, a cathode plate, a stirring device and a first feeding hopper are arranged in the electrolytic mixing tank, the anode plate and the cathode plate are electrically connected with a direct-current power supply, and the first feeding hopper is used for adding solid organic wastes into the electrolytic mixing tank; aerobic microorganisms and earthworms are distributed at the bottom of the aerobic composting pool, and an oxygen aeration head is further arranged at the bottom of the aerobic composting pool. According to the sludge treatment system disclosed by the invention, direct-current electrolysis, anaerobic fermentation and aerobic composting are combined, so that sludge treatment is effectively realized; according to the sludge treatment system, landfill treatment is not needed, land resources are prevented from being occupied, the environment is prevented from being polluted, the sludge treatment system is high in comprehensive treatment capacity, small in occupied area, simple in structure, high in treatment efficiency and free of secondary pollution risks, and sludge is completely converted into organic fertilizer.

Description

technical field [0001] The invention relates to the field of environmental pollutant treatment equipment, in particular to a treatment system and method for residual sludge of urban domestic sewage. Background technique [0002] In recent years, with the continuous strengthening of environmental protection by the Chinese government, domestic sewage treatment capacity and sewage treatment rate have been continuously improved. At the same time, the surplus sludge output of sewage treatment plants has also increased. Excess sludge is an extremely complex heterogeneous body, including organic pollutants, inorganic particles, water, etc. Due to its large output, high moisture content, complex composition, and extreme instability, how to properly dispose of sludge has always been a problem for cities and towns. The problem of normal operation of sewage treatment plants has attracted more and more attention in recent years on the research and development of excess sludge treatment ...

AI Technical Summary

Problems solved by technology

For many years, the treatment and disposal of sludge in most sewage treatment plants is generally directly transported to landfill after concentration and dehydration. Since the sludge contains toxic and harmful substances such as heavy metals, pathogens and persistent pollutants, the dewatered sludge directly After landfilling, it may still cause secondary pollution to the environment, directly threatening public health and environmental safety

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