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Advanced treatment method of nitrate-containing water

An advanced treatment and nitrate technology, applied in the field of water treatment, can solve the problems of large investment in the combined process of activated sludge and membrane bioreactor, affecting the sedimentation effect of the secondary sedimentation tank, and complicated operation, and achieves good sedimentation performance and investment. Less and more efficient processing

Active Publication Date: 2014-02-12
上海心缘环境工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome that for large-scale nitrate-containing water treatment, the SBR method of the prior art is not suitable for processing low-concentration nitrate-containing water, and the continuous flow activated sludge method is used for denitrification sludge. The sedimentation effect of the settling tank, or the defect of large investment and cumbersome operation of the combined process of activated sludge and membrane bioreactor, provides a method with simple process, low investment, high treatment efficiency, and suitable for large-scale advanced treatment of nitrate water

Method used

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Embodiment 1

[0026] The schematic diagram of the technological process of the advanced treatment of nitrate-containing wastewater in this embodiment is as follows figure 2 shown.

[0027] The concentration of nitrate in groundwater in a certain area is 20mg·L -1 About, the COD value is 10mg·L -1 ~50mg·L -1 , pH 6.0-9.0, seriously exceeding the standard, and the present invention is applied to treat it. The treated water volume is 10000m 3 d -1 , the main structures are: (1) anoxic pool (denitrification pool), pool size: 10×10×5.5m, effective volume: 500m 3 , equipped with an underwater propeller (stirring effect), the energy consumption is 1KW / 1000m 3 (2) Aeration tank (aerobic tank), tank size: 20×10×5.5m, effective volume: 1000m 3 , (3) The surface load of the secondary settling tank is 0.5m 3 / m 2 / h design, the size is Φ10×5.5m, and the effective volume is 3533m 3 . The system is inoculated with sludge 10g·L at one time -1 .

[0028] The waste methanol produced by the loc...

Embodiment 2

[0030] The concentration of nitrate in groundwater in a certain area is as high as 100mg·L -1 About, the COD value is 10mg·L -1 ~50mg·L -1 , pH 6.0-9.0, and there are many small sugar or starch factories in this area, and the production wastewater is mostly biodegradable, which is suitable as a carbon source for nitrate denitrification. Similarly, ethanol, phthalic acid, acetic acid or Glucose can all achieve the same purpose. Applying the present invention to enter nitrate groundwater for treatment also solves the problem of discharge of production waste water up to standard in many enterprises.

[0031] The average COD of wastewater discharged from a sugar production plant is 4000mg·L -1 , water volume is 500m 3 d -1 . An anoxic pool / aeration pool system is established in the factory area, and the main structure has an anoxic pool 500m 3 , aeration tank 1200m 3 , the secondary settling tank is 0.75m according to the surface load 3 / m 2 / h design, the volume is 3500...

Embodiment 3

[0034] Establish a laboratory simulation test device, anoxic tank 25L, aerobic tank 50L, secondary sedimentation tank 500L. Influent nitrate concentration is 100mg·L -1 , COD value is 10mg·L -1 ~50mg·L -1 , pH 6.0~9.0, water volume from 0.25m 3 d -1 Gradually increase to 1.5m 3 d -1 , the nitrate load in the anoxic pool was changed from 0.5gNO 3 -N·L -1 d -1 Increased to 3.0gNO 3 -N·L -1 d -1 , the sludge reflux ratio is 1.0.

[0035] When the nitrate load in the anoxic pool is less than or equal to 1.0gNO 3 -N·L -1 d -1 , when the aeration rate is 15m 3 / min / 1000m 3 When the aeration tank sludge sinks to the bottom, it obviously cannot meet the needs of the present invention; the aeration air volume is at 20m 3 / min / 1000m 3 , the effluent COD is maintained at 6mg·L -1 Around; continue to increase the air volume to 25m 3 / min / 1000m 3 , the effluent COD did not change significantly. That is, when the nitrate load in the anoxic pond is less than 1.0gNO 3 -...

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Abstract

The invention discloses an advanced treatment method of nitrate-containing water, which comprises the following steps: sending nitrate-containing water and a carbon source into an anoxic tank for treatment, sending into an aeration tank for treatment, passing through a secondary sedimentation tank to separate mud from water, and discharging the water, wherein the nitrate load of the anoxic tank is 0.5-3.0gNO[3]-N.L<-1>.d<-1>, and the load of the aeration tank is 0.5-1.0gCOD.L<-1>.d<-1>. The method has the advantages of simple process, low investment and treatment efficiency, and is suitable for treating large-scale nitrate water; the removal rates of nitrates and COD (chemical oxygen demand) are respectively higher than 99% and 95%, the SS (suspended sediment) in the effluent water is very low, no nitrate is detected, and the COD is only 6mg.L<-1> or so; and the effluent water is clear and transparent.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for advanced treatment of nitrate-containing water. Background technique [0002] At present, whether in industrially developed countries or developing countries, nitrate pollution has rapidly developed into an important environmental problem. The 2009 "China Environmental Status Bulletin" shows that in the water quality monitoring of 641 wells in 8 provinces (autonomous regions and municipalities) in Beijing, Liaoning, Jilin, Shanghai, Jiangsu, Hainan, Ningxia and Guangdong, the NO 3 -N concentration greater than 20mg·L -1 , which is the drinking water standard set by the US Environmental Protection Agency (10mgNO 3 -N) more than 2 times. The "National Groundwater Pollution Prevention and Control Plan (2011-2020)" issued by the Ministry of Environmental Protection, the Ministry of Land and Resources and the Ministry of Water Resources clearly stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F101/16
Inventor 金锡标王锋周思辰仇鑫耀洪大林罗威威陈宏虎
Owner 上海心缘环境工程有限公司
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