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Filter back washing water recovery processing method and membrane filtration system thereof

A technology for backwashing water and recycling treatment, which is applied in the fields of water/sewage multi-stage treatment, light water/sewage treatment, water/sludge/sewage treatment, etc. The effect of reducing water purification load, stabilizing water quality, and improving water quality safety

Active Publication Date: 2010-10-20
SHENZHEN WATER GRP CO LTD
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  • Abstract
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Problems solved by technology

At present, domestic water plants with recycling processes usually recycle the backwash water directly to the front end of the water plant, and mix it with the raw water of the water plant for post-treatment. This practice will generate an impact load on the main process of the water plant. Still contains a lot of organic matter, microorganisms and heavy metals, so there is a risk of water quality safety

Method used

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  • Filter back washing water recovery processing method and membrane filtration system thereof
  • Filter back washing water recovery processing method and membrane filtration system thereof
  • Filter back washing water recovery processing method and membrane filtration system thereof

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Embodiment Construction

[0022] The present invention is described below in conjunction with embodiment:

[0023] The method for recovering and treating backwash water in a filter tank of the present invention includes A: a pretreatment process, B: a membrane filtration process, and C: a disinfection process.

[0024] The A: The purpose of the pretreatment process is to remove particulate matter and reduce the load of pollutants entering subsequent units. It can be used in both batch recovery and continuous recovery. The more commonly used methods are sedimentation, micro-sand assisted sedimentation or air flotation. The pretreatment process can be used alone, but when the sedimentation effect is not good when used alone, a coagulant can be added during the pretreatment, the purpose of which is to help improve the separation effect. It has been proved that the proper application of pretreatment can obtain satisfactory turbidity and particle removal rate, including two insects. The preferred coagulan...

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Abstract

The invention discloses a filter back washing water recovery processing method and a membrane filtration system thereof. The filter back washing water recovery processing method comprises: 1. pretreating; 2. filtering membranes; and 3. sterilizing. The membrane filtration system utilizes a submersible pump to pump back washing water into a water inlet tank, and water is fetched from the water inlet tank by a water inlet pump and is filtered after being fed to a membrane assembly; part of filtered clean water enter the back washing water tank to participate in the back washing process and is reversely pumped into the membrane assembly by a back washing water pump; and compressed air is blasted in by a pressure tank and an air compressor arranged on the inlet end of the feed liquid of the membrane assembly to clean the membrane assembly. The invention not only improves recycling water quality safety of back washing water in filters in waterwork but also reduces the influence of safety risk when being directly used on a main technology in the waterwork. The invention has the recovery rate of back washing water of 95%, improves the recycling water quality safety of back washing water in filters in the waterwork and lowers the pure water load of main technology.

Description

technical field [0001] The invention relates to the field of recovery and treatment of filter backwash water. In particular, the invention relates to a method for recovering and treating backwash water in a filter tank and a membrane filtration system thereof. Background technique [0002] With the continuous development of urban construction and environmental protection, the pollution of production wastewater discharged from water supply plants has attracted more and more attention. The increasing pressure on water resources has made the reuse of water plant production wastewater a mainstream. The treatment of sludge water from water supply plants started relatively late in China, so at present, less than 5% of my country's surface water plants have sludge water treatment and recycling facilities, and new water plants tend to add recycling facilities. Recycling and reuse of wastewater in water purification plants saves fresh water resources and has the significant advanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/44C02F1/32
Inventor 张金松陈益清范爱丽刘茜尤作亮杨海燕
Owner SHENZHEN WATER GRP CO LTD
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