Polluted underground water deep purification combined denitrification system and process method

A deep purification, groundwater technology, applied in chemical instruments and methods, aerobic process treatment, water/sewage multi-stage treatment, etc.

Inactive Publication Date: 2012-11-14
BEIJING INST OF WATER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the existing single biological method / physicochemical method in the treatment of heavily polluted groundwater purification technology, aiming at the water quality characteristics of the groundwater polluted by landfill leachate with high content of organic matter and ammonia nitrogen, to provide a method that includes aeration Contaminated groundwater deep purification combined denitrification system and process method of logistics pond-constructed wetland combination system, so as to ensure efficient removal of ammonia nitrogen and nitrate

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  • Polluted underground water deep purification combined denitrification system and process method
  • Polluted underground water deep purification combined denitrification system and process method

Examples

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Embodiment 1

[0026] Example 1 Contaminated groundwater deep purification combined denitrification system

[0027] Such as figure 1 with figure 2 As shown, in a preferred embodiment of the present invention, the combined system for advanced purification of polluted groundwater mainly includes aerated biological fluidization tank 1 , primary subsurface flow wetland 2 and secondary subsurface flow wetland 3 connected in sequence.

[0028] The aerated biological fluidization tank 1 is a brick-concrete structure with a specification of 12m×1.0m×1.5m (length×width×depth). A microporous aeration system is installed at the bottom of the aerated biological fluidization tank. The filling specific gravity in the pool is 0.8g / cm 3 ~0.95g / cm 3 porous polymer fillers as microbial carriers. This system can use the microbial carrier materials commonly used in aerated biological fluidized tanks, as long as it is a polymer material with a spatial network structure, and has active groups such as amino,...

Embodiment 2

[0031] Embodiment 2 polluted groundwater purification test

[0032] The polluted water source is the groundwater near a waste landfill in Beijing area. The ammonia nitrogen concentration in the raw water is 21.5mg / L~30.5mg / L. The system described in Example 1 is used to treat the sewage, and the polluted groundwater is lifted by the lifting pump and sent to the aeration plant. Materialization tank, the hydraulic retention time is 2.4h, the volume load is 0.5kgTN / (m 3 d) The gas-water ratio is 5:1, and the ammonia nitrogen concentration is reduced to 4.2mg / L-5.5mg / L after treatment.

[0033] Afterwards, the sewage enters the first-level subsurface flow wetland from the outlet of the aerated biological fluidization tank, the hydraulic retention time is 25h, and the surface load is 0.45m 3 / (m 3 d) After treatment, the concentration of ammonia nitrogen is reduced to 0.5mg / L-1.2mg / L.

[0034] The sewage treated by the primary subsurface wetland enters the secondary subsurface w...

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Abstract

The invention relates to a polluted underground water deep purification combined denitrification system, which comprises an aeration biological fluidized tank, primary subsurface flow wetland and secondary primary subsurface flow wetland in sequential connection. The invention also provides a method adopting the system for purifying the water quality. According to the method, a lifting pump is used for lifting polluted underground water to the aeration biological fluidized tank, most ammonia nitrogen in the polluted water is directly oxidized into nitrate nitrogen under the effect of nitrifiers, sewage enters the primary subsurface flow wetland, the rest ammonia nitrogen is further oxidized into nitrate nitrogen under the aerobic condition, then, the sewage enters the secondary subsurface flow wetland to complete the denitrification effect under the anaerobic conditions, and the nitrate nitrogen is reduced into nitrogen gas. The system aims at the water quality characteristic of high organic matter and ammonia nitrogen content in underground water polluted by landfill leachate, an aeration biological fluidized tank is combined with the constructed wetland technology, the ammonia nitrogen removal rate reaches higher than 99 percent after the purification, the water outlet concentration of nitrate is smaller than 5mg/L, and the ammonia nitrogen and nitrate concentration of the polluted underground water after the treatment completely meets the water quality standard of drinking water.

Description

technical field [0001] The invention relates to a technology for deep purification treatment of polluted groundwater, in particular to treating groundwater polluted by landfill leachate by adopting an aerated biological fluidization tank-artificial wetland combined process. Background technique [0002] With the rapid development of cities, the problem of landfill leachate groundwater pollution continues to intensify. For example, there are 1,005 garbage dumps in the 14 districts and counties of Beijing, which store 46.74 million tons of garbage. Among them, 32.33 million tons of informal garbage without strict anti-seepage measures accounted for 69.2%. Garbage leachate has become one of the main pollution sources of shallow groundwater in Beijing. For polluted groundwater, developed countries such as Europe and the United States have developed many pollution control technologies since the 1970s, such as osmotic reaction grid technology, in-situ bioremediation technology, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/08C02F3/32
CPCY02W10/10
Inventor 沈来新刘培斌王国青魏文侠夏广卿许志刚张琦伟
Owner BEIJING INST OF WATER
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