Rotary filtering pond for sewage treatment

Abstract

The invention relates to a rotary filtering pond for sewage treatment, which is applied in sewage depth filtration treatment, belonging to the technical field of sewage treatment, wherein the main body comprises: a water inflow distribution well, a water inflow distribution dam, a turnplate support, a turnplate and a filter cloth thereof, a central rotary drum, a speed reducer and a transmission device thereof, a back-washing water pump, a back-washing sprayer, a pulse pressure regulating device, a sludge suction pump, a water level regulating checkgate, a clean-water reservoir, a sludge bucket, a turnplate suction pump and so on. The pond employs the outer inflow type and is provided with the distribution dam for water inflow, and is also provided with the sludge suction device and the washing device for the filter cloth. The inflow water enters the filter pond from the water distribution dam on the two ends by rectifying the water flow through the water distribution well. Because of the differences between the inner and outer pressures of the turnplate, water passes through the micrometre-scale filter cloth while suspended matters are held back in the filtering pond and precipitated in the sludge bucket on the lower part, and sucked out of the filtering pond by the sludge suction pump, wherein the permeated water enters the clean-water reservoir through the hollow central rotary drum to finish the filtering on the sewage. The suspended matters held back on the surface of the filter cloth of the turnplate are washed away by a high pressure sprayer and a suction device.

Description

technical field [0001] The invention relates to a turntable filter tank for sewage treatment, which is applied to the deep filtration treatment of sewage and belongs to the technical field of sewage treatment. Background technique [0002] At present, in the field of advanced sewage treatment, tank pressure filtration and filler pressureless gravity filtration are mainly used for sewage filtration. Most of the filter materials are distributed horizontally. The flow area is reduced, the flow channel is blocked, and it must be shut down for backwashing. It is necessary to build a large blower room and a backwashing pump room, and the filter material needs to be replaced after a period of time. The area is large, the cost of civil engineering is high, and the cost per ton of water is higher than that of rotary disc filtration. [0003] In recent years, in the field of advanced sewage treatment, the rotary disc filter device has been widely used, and has the advantages of good ...

AI Technical Summary

Problems solved by technology

[0002] At present, in the field of advanced sewage treatment, tank pressure filtration and filler pressureless gravity filtration are mainly used for sewage filtration. Most of the filter materials are distributed horizontally. The flow area is reduced, the flow channel is blocked, and it must be shut down for backwashing. It is necessary to build a large blower room and a backwashing pump room, and the filter material needs to be replaced after a period of time. The area is large, the cost of civil construction is high, and the cost per ton of water is higher than that of rotary disc filtration

The main disadvantage of the internal water inlet method is that if large pieces of dirt in the sewage enter the filter plate with the water, it is extremely difficult to clean up, and it will cause blockage of the filter medium and reduce the effective filter area

The working liquid level of the inner water inlet turntable is limited by the height of the dirt receiving bucket located in the turntable, and the effective filtration area (that is, the submerged area) can only reach about half of the total area, so that under the same flow rate, the number of designed disks is larger than that of the outer water inlet form. The number of discs required is large, the area is larger, and the investment is more

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