Sludge phase-splitting slaking method of water treatment plant

Abstract

The invention disclose a sludge phase-splitting slaking method of waste water disposing plant involving to a sludge disposing and resource utilization technology, which comprises the following steps: proceeding aerate hydrolytic slaking reaction 6d with dissolved oxygen at 1.5-2 mg / L, pH value at 5.5-6.0 and temperature at 30-35 deg.c; getting hydrolytic slaking product; entering into centrifugal machine; proceeding solid-liquid separation; getting hydrolysate and mud cake; entering hydrolysate into filling-type methanation reacting bed with temperature at 32-38 deg.c and cycling speed at 0.005-0.02m / s; proceeding methanation slaking with waterpower residence time at 3d; getting marsh gas and slaking yielding water; leading marsh gas to gas-fired boiler; producing vapor; refluxing slaking yielding water to distribution well of sewage disposal plant; mixing mud cake with dry sludge till moisture percentage at 50-60%; heating and drying with vapor producing by boiler in dehumidifier; getting dry sludge with moisture percentage at 32-38%; using to land.

Description

technical field [0001] The invention discloses a phase-separation digestion method for sewage treatment plant sludge, relates to a sewage treatment plant sludge treatment and resource utilization technology, and belongs to the technical field of sewage treatment plant sludge waste pollution control. Background technique [0002] Sludge is an inevitable secondary pollutant in sewage treatment plants using aerobic biological treatment processes. The results of the material balance test of urban sewage treatment plants show that more than 70% of the organic matter removed in the water treatment process of sewage plants is enriched in sludge. Therefore, "reduction, harmlessness, and recycling" are the principles of sludge management in sewage treatment plants, and also the basic guidelines for the development and selection of treatment technologies. At present, the sludge anaerobic digestion technology that conforms to the sludge management principles ...

AI Technical Summary

Problems solved by technology

Therefore, within the framework of sludge anaerobic digestion, there is still a lack of solutions. In order to avoid the problem of phosphorus release in sludge digestion, only aerobic digestion or no digestion technology can be used, but sludge aerobic digestion is very important for treatment Capacity greater than 50,000 m 3 / d sewage plant, its economy is obviously inferior to that of anaerobic digestion

Instead of using digestion technology, under the same dehydration technology conditions, the dehydration effect of sludge is significantly reduced, which is not conducive to the reduction of sludge

In summary, there is currently no solution to these technical problems prevalent in anaerobic digestion of sludge

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