Wastewater treatment system and method for improving coefficient of recovery

Abstract

The invention discloses a wastewater treatment system for improving the recovery rate and a treatment method thereof, which belongs to the field of wastewater treatment. The system comprises a sand filter feed water pump, a sand filter, an ultra-filtration feed water pump, an ultra-filtration / micro-filtration device and a coagulating sedimentation sub system, wherein the sand filter feed water pump is provided with a wastewater inlet pipe, and an outlet pipe of the sand filter feed water pump is orderly connected with the sand filter, the ultra-filtration feed water pump and the ultra-filtration / micro-filtration device so as to form a main treatment system; and a back wash wastewater discharge pipe of the sand filter and the concentrated solution and a back wash wastewater discharge pipe of the ultra-filtration / micro-filtration device are connected to the coagulating sedimentation sub system, and a supernatant return pipe of a sedimentation tank of the coagulating sedimentation sub system is connected to the wastewater inlet pipe of the sand filter feed water pump. By the coagulating sedimentation process, the supernatant which is obtained after the concentrated solution and the back wash wastewater of the ultra-filtration / micro-filtration device and the back wash wastewater of the sand filter during the pre-treatment are treated is returned back to the ultra-filtration / micro-filtration system for treatment and is then discharged as purified water, thereby improving the recover rate and the water utilization rate of the ultra-filtration / micro-filtration device.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a wastewater treatment system and a treatment method for improving the recovery rate. Background technique [0002] At present, ultrafiltration (UF) / microfiltration (MF) technology is widely used in wastewater treatment systems to improve the recovery rate of sewage treatment. figure 1 Provided is an existing wastewater treatment system utilizing ultrafiltration / microfiltration technology, which is mainly composed of a pretreated sand filter unit 21 and an ultrafiltration (UF) / microfiltration (MF) device 22. In this wastewater treatment system , the good water B1 treated by the ultrafiltration / microfiltration device is directly discharged, and generally the concentrate produced by the ultrafiltration / microfiltration device 22, the backwash wastewater D1 and the pretreated sand filter unit 21 before the ultrafiltration / microfiltration treatment The backwash wastewater C1 ...

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Problems solved by technology

[0003] Based on the problems existing in the above-mentioned prior art, the object of the present invention is to provide a water treatment system and treatment method for improving the recovery rate, which can effectively improve the recovery rate of sewage treatment with a relatively low investment, and solve the waste of resources and pollution problems

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