Sludge storage tank and sludge concentration process

Abstract

The invention discloses a sludge storage tank and a sludge concentration process. The sludge storage tank comprises a sludge storage tank body, a sludge inlet pipe and a water outlet pipe, wherein a sludge outlet is formed in the sludge storage tank body; the sludge inlet pipe and the water outlet pipe extend from the bottom part to upper part of the sludge storage tank body; the upper end of the sludge inlet pipe is connected with a division-point sludge inlet perforated pipe arranged along the inner wall of the sludge storage tank body; the upper end of the water outlet pipe is connected with a fixed decanter pipe; the fixed decanter pipe is higher than the division-point sludge inlet perforated pipe. The sludge concentration process comprises the following steps: 1) feeding sludge; 2) precipitating; 3) discharging the concentrated sludge, and repeatedly circulating the step 1) and step 2), wherein in the step 2) of a certain stage, if the distance from a sludge layer to a liquid surface is less than 400mm, the next stage is the last stage of the circulation; finishing the step 2) before executing the step 3) in the last stage of the circulation; in the step 1), inputting sludge along the periphery of the sludge storage tank body by use of the division-point sludge inlet perforated pipe; collecting the generated supernate and discharging by the water outlet pipe. The sludge storage tank and the sludge concentration process have the advantages of good sludge concentration effect and high dehydration efficiency.

Description

technical field [0001] The invention relates to sewage treatment facilities and processes, in particular to a sludge storage tank and a sludge concentration process. Background technique [0002] In recent years, my country's population growth and urbanization level have been continuously improved, and urban sewage treatment facilities have also been popularized. With the improvement of sewage treatment rate and the deepening of treatment degree, the output of by-product sludge will have a greater increase. It is expected that in 2020 it will Reached 53.6 billion m 3 / d, and it is also growing at a rate of 10% per year. [0003] The composition of sludge is very complex. It contains solid particles such as sediment, fiber, animal and plant residues and coagulated flocs mixed in domestic sewage and industrial wastewater. It is a variety of colloids, organic matter and adsorbed metal elements. The complex of toxic and harmful substances such as insect eggs and insect eggs can...

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Problems solved by technology

On the one hand, the integrated thickening and dehydrating machine directly concentrates and dehydrates the remaining sludge through the sludge storage tank, which simplifies the treatment process section of sludge pre-concentration and reduces the initial project investment. However, due to the high moisture content of the treated sludge, the The operating efficiency of the equipment is low, and the running time required to discharge the same sludge is longer, which virtually increases the energy consumption of the system operation; After reaching 95-97%, mechanical dehydration is carried out, which effectively improves the operating efficiency of the equipment and reduces the energy consumption cost of the system operation to a certain extent. However, due to the increase of the sludge concentration process section, the initial project investment is relatively high, and the sludge storage tank The conventional process operation mode is to continuously enter and discharge mud, and control the start and stop of the remaining sludge pump and the sludge screw pump through the liquid level gauge in the tank. The mud dewatering machine has low desliming efficiency, high power consumption, and high flocculant dosage. If the sludge concentration time is not properly controlled, it will also affect the total phosphorus concentration index and dehydration effect of the sewage plant.

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