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System and method for taking and reusing water from riverway supplemented with recycling water

A technology of reclaimed water and water reuse, applied in the field of water pollution treatment, can solve the problems of short hydraulic retention time and limited removal of dissolved organic matter, and achieve the effect of strong complementarity and energy consumption reduction

Inactive Publication Date: 2011-05-04
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary shore filtration has a short hydraulic retention time, which is mainly used to remove suspended solids in water, and has limited effect on the removal of dissolved organic matter.

Method used

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  • System and method for taking and reusing water from riverway supplemented with recycling water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After the advanced treatment of the secondary effluent from the urban sewage plant, it meets the requirements of Class IV water in the surface water environmental quality standard (GB3838-2002) (TN2 ) is 40-60%, and the recovery rate is controlled at 15%. Through the first-stage nanofiltration system, 80% of DOC, 40% of total dissolved solids and 10% of nitrate can be removed. The effluent from the first-stage nanofiltration system enters the second-stage nanofiltration system. The second-stage nanofiltration system adopts a nanofiltration membrane with a high desalination rate, which is negatively charged. The molecular weight cut-off is 150, and the desalination rate reaches (CaCl 2 ) is 85%, the second-stage nanofiltration system removes 80% of nitrate and 90% of sulfate, and the effluent can meet the requirements of the third type of groundwater quality standards, and can be used for urban landscape, irrigation, greening, urban miscellaneous purposes, and process wat...

Embodiment 2

[0028] After the advanced treatment of the secondary effluent from the urban sewage plant, it meets the requirements of Class IV water in the surface water environmental quality standard (GB3838-2002) (TN2 ) is 40-60%, and the recovery rate is controlled at 10%. The second-stage nanofiltration system uses a nanofiltration membrane with a desalination rate, which is negatively charged, has a molecular weight cut-off of 300, and has a desalination rate of (CaCl 2 ) is 90%. The two-stage nanofiltration has a removal efficiency of more than 90% for trihalomethane precursors, 80% for TDS, and more than 80% for nitrate, chloride, and sulfate, which can meet the requirements of three types of groundwater Water quality standard requirements, can be used for urban landscape, irrigation, greening, urban miscellaneous, process water, etc.

Embodiment 3

[0030] After the advanced treatment of the secondary effluent from the urban sewage plant, it meets the requirements of Class IV water in the surface water environmental quality standard (GB3838-2002) (TN2 ) is 40-60%, and the recovery rate is controlled at 10%. Through the first-stage nanofiltration system, 80% of DOC, 85% of UV254, 45% of total dissolved solids and 10% of nitrate can be removed. The effluent from the first-stage nanofiltration system enters the second-stage nanofiltration system. The second-stage nanofiltration system uses a nanofiltration membrane with a desalination rate, which is negatively charged, has a molecular weight cut-off of 150, and has a desalination rate of (CaCl 2 ) is 95%, and the second-stage nanofiltration system removes 85% of TDS, 85% of nitrate, 90% of sulfate, Cr, Ni, etc. are not detected, and the effluent can meet the requirements of the three types of groundwater quality standards and can be used for Urban landscape, irrigation, gree...

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Abstract

The invention discloses a system and method for taking and reusing water from a riverway supplemented with recycling water, belonging to the technical field of water pollution treatment. The system adopts a method of combining a reoxygenation-type shore filter with a nanofiltration membrane, and takes water from the riverway supplemented with recycling water; and after being purified, the water can be reused as various types of non-direct drinking water. Recycling water entering the riverway satisfies the IV class water requirement (TN<10mg / L) of environmental quality standard for surface water (GB3838-2002). The method comprises the following steps: arranging the reoxygenation-type shore filter along the shore of the riverway; removing parts of soluble organic matters, ammonia nitrogen and the like in river water by the degradation action of microorganisms; and causing shore filtered water to enter a two-level nanofiltration system to remove most organic matters, nitrate nitrogen, inorganic salt and the like remained in the water. Nanofiltration effluent can satisfy the water quality standard requirement of thee-class ground water and can be used for urban landscapes, irrigation, virescence, various purposes in city, process water and the like.

Description

technical field [0001] The invention relates to a system and a method for reusing water from a river channel replenished with regenerated water, and belongs to the technical field of water pollution treatment. Background technique [0002] In nature, surface runoff (such as rivers, lakes, etc.) formed by atmospheric precipitation is an important part of surface water. However, it cannot be ignored that with the in-depth development of sewage resources in our country, a large amount of urban reclaimed water enters surface water bodies and becomes an important part of recharging river and lake water bodies. For example, in the urban area of ​​Beijing, according to the plan for the utilization of recycled water, nine sewage treatment plants in the urban area will implement recycled water utilization projects, so that the recycled sewage can reach the Class IV standard of surface water (TN<10mg / L), forming the city’s second water source. Most of the recycled water will be us...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 赵璇杨建吴琳琳常江
Owner TSINGHUA UNIV
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