Sludge source reduction treatment method and device

Abstract

The invention discloses a sludge source reduction treatment method and a device. The method includes: subjecting a sludge and sewage mixed solution to complete aeration and mixing in an aerobic biochemical pool, introducing the effluent solution into a precipitation pool to undergo precipitation, bringing out the supernatant, and periodically extracting quantitative precipitated sludge from the precipitation pool, making the quantitative precipitated sludge enter a pre-anoxic reaction pool and then enter an anaerobic reactor through the pre-anoxic reaction pool to undergo reaction, then extracting equivalent sludge and leading it into a pre-aeration reaction pool to undergo aeration mixing for 2-8h, then extracting an equivalent sludge mixed solution from the pre-aeration reaction pool to supplement the aerobic biochemical pool, thus finishing cyclic exchange flow of the sludge among precipitation-pre-anoxic-anaerobic-pre-aeration-aerobic-precipitation equipment. The method and the device provided by the invention have the advantages that: the sludge reduction effect is good and stable, the nitrogen removal ability of the technological system is enhanced, and the newly added pre-aeration reaction pool strengthens the nitrification function of the system, so that more nitrogen pollutants are converted to nitrate nitrogen and then can be removed in the anaerobic reactor, construction and transformation are easy, and the building cost is low, thus having long-term economic benefits.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a residual sludge reduction treatment process. Background technique [0002] In recent years, my country's sewage treatment industry has achieved rapid development. The biological treatment process based on activated sludge method has been widely used in various scales of urban sewage treatment process because of its high organic pollutant removal effect. middle. At the same time, since urban sewage treatment plants almost all use various forms of activated sludge as the treatment process, a large amount of excess sludge will inevitably be produced. At present, the total amount of excess sludge produced by urban sewage plants in my country is huge and growing rapidly. There is no proper treatment method and the cost of treatment and disposal is high. In addition, sludge contains toxic and harmful substances such as heavy metals, various organic matter and bacteria, which will cause ...

AI Technical Summary

Problems solved by technology

The landfill method will occupy a large number of sites. At the same time, due to the high moisture content of the sludge itself, landslide landslide accidents will occur in simple landfills, and at the same time, more leachate will be produced after landfills, which will cause serious environmental damage secondary pollution, which also affects the normal service life of the landfill to a certain extent

In February 2009, the No. 3 sludge pit of Xiaping solid waste landfill in Qingshuihe, Shenzhen was caused by a piping accident due to too much sludge.

[0005] In addition, sludge disposal methods mainly include resource utilization (brick making, composting, etc.), land utilization, and incineration. limited by further development

If the sludge is directly applied to the farmland, it will cause toxicity to crops due to a large number of pathogenic bacteria and unstable organic matter; (aerobic or anaerobic) composting and use as fertilizer in agriculture will still have potential hazards due to the presence of heavy metals; incineration is also Low incineration efficiency due to high moisture content and low calorific value, and serious secondary pollution

[0006] Due to the existence of various key links that cannot be solved for the time being in domestic sludge recycling, the large-scale promotion of resource recycling technology is limited to a certain extent. The existence of such things makes the sludge unable to become a "useful resource" in the true sense and produce "real economic benefits".

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