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Method and device for supplying underground water with municipal sewage through biofilter and ultrafiltration technology

An urban sewage and biological filter technology, which is applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc. Effect

Inactive Publication Date: 2012-01-11
BEIJING DRAINAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, nitrogen and organic matter are the pollutants that need to be paid attention to in the process of groundwater recharge, while the total nitrogen in the secondary effluent of existing sewage treatment plants is generally 20-30mg / L, which has exceeded the total nitrogen concentration in the third-class groundwater quality standard value, and cannot be directly used as source water for groundwater recharge; there are also a wide variety of organic substances in the secondary effluent, such as pharmaceuticals and skin care products (PPCP) and their metabolites, endocrine disruptors (EDC) and genotoxic aromatic amines, etc.

Method used

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  • Method and device for supplying underground water with municipal sewage through biofilter and ultrafiltration technology
  • Method and device for supplying underground water with municipal sewage through biofilter and ultrafiltration technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] After secondary treatment in the sewage treatment plant, the urban domestic sewage enters from the bottom A of the denitrification biofilter 1, wherein the carbon source in the denitrification biofilter 1 has a C / N ratio of 4 and a pH of 8.5. Using microbial denitrification, remove 85% of nitrate and 52% of TP in water.

[0036] The effluent from the denitrification biofilter 1 enters the ultrafiltration device 3. The ultrafiltration device 3 adopts a hollow fiber with a molecular weight cut-off of 150,000 Daltons, and the membrane pressure difference is 0.04 MPa; it adopts a cross-flow design to remove 9% TOC and 85% turbidity. degrees and 97% total coliforms.

[0037] The ultrafiltered water enters the ozone reaction tank 5 through the water collecting tank and the water pump. The ozone generator 4 uses air as the oxygen source to disperse small bubbles and enters from the bottom of the reaction tank. The dosage of ozone in the water is 2 mg / L, and the hydraulic rete...

Embodiment 2

[0040] After the urban domestic sewage is treated by the sewage treatment plant for secondary treatment, it enters the water from the bottom A of the denitrification biological filter 1, in which the C / N ratio is 6 and the pH is 6.5 during the carbon source dosing process. Use the denitrification of microorganisms to remove 80% of nitrate and 50% of TP in water.

[0041]The effluent from the denitrification biofilter 1 enters the ultrafilter 3 with a molecular weight cut-off of 100,000 Daltons and a membrane pressure difference of 0.1 MPa; cross-flow design is adopted to remove 10% TOC, 82% turbidity and 98% total coliforms.

[0042] The ultrafilter 3 effluent enters the ozone reaction tank 5 through the water collecting tank and the water pump. The ozone generator 4 uses air as the source of oxygen to disperse small air bubbles and enters from the bottom of the reaction tank. The dosage of ozone in the water is 6mg / L, and the hydraulic retention time is 30min. Focus on the m...

Embodiment 3

[0045] After the urban domestic sewage has been treated by the sewage treatment plant for secondary treatment, it will flow in from the bottom A of the denitrification biological filter 1. The C / N ratio is 5 and the pH is 7 during the carbon source dosing process. Using microbial denitrification, remove 82% of nitrate and 55% of TP in water.

[0046] The effluent from the denitrification biofilter 1 enters the ultrafilter 3 with a molecular weight cut-off of 120,000 Daltons and a membrane pressure difference of 0.06 MPa. It adopts a cross-flow design to remove 9% TOC, 85% turbidity and 97% total coliforms.

[0047] The outlet water of the ultrafilter 3 enters the ozone reaction tank 5 through the water collecting tank and the water pump. The ozone generator 4 uses air as the oxygen source to disperse small bubbles and enters from the bottom of the reaction tank. The dosage of ozone in the water is 10 mg / L, and the hydraulic retention time is 20 minutes. In the ozone reaction t...

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Abstract

The invention relates to a method and a device for supplying underground water with municipal sewage through a biofilter and an ultrafiltration technology. The method adopts second-grade treated water as a raw material from a municipal sewage treatment plant and comprises the following processes that the second-grade treated water passes through a denitrification biofilter and an ultrafiltration device, undergoes an ozone reaction, seeps into the ground in a way of flooding on the surface of the ground, passes through a soil vadose zone and enters a phreatic aquifer. The method and device belonging a municipal sewage advanced treatment technology can remove effectively and economically multiple pollutants in municipal sewage, make product water satisfy three types of underground water quality standards and realize safe supplying of underground water.

Description

technical field [0001] The invention relates to the technical field of sewage treatment and reuse, in particular to a method for replenishing groundwater with urban sewage. Background technique [0002] my country is a country with severe drought and water shortage. The advanced treatment and reuse of urban sewage is also an important way to solve urban water shortage, improve water resource utilization and control water pollution. It has unparalleled advantages in other strategies and methods. The "new" water source provides the possibility to replace the existing water source and becomes a powerful measure to alleviate the current situation of water shortage. [0003] At present, the urban domestic sewage, after the secondary treatment of the sewage treatment plant, even if the effluent meets the discharge requirements of the first-level B standard of the urban sewage treatment plant pollutant discharge standard (GB18918-2002): COD, total nitrogen, chromaticity and fecal co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/28C02F1/44C02F1/78
Inventor 杨建念东孟春霖高金华
Owner BEIJING DRAINAGE GRP CO LTD
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