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Method for treating benzene series compounds in underground water

A technology of groundwater and benzene series, applied in the field of water treatment, can solve the problems of high primary investment cost, high operation and maintenance cost, and many secondary problems of membrane treatment, so as to avoid the increase of SS of effluent, reduce energy consumption, and reduce operating cost Effect

Inactive Publication Date: 2018-03-09
NANJING POLYTECHNIC INSITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All indicators of the effluent of this process are better than the requirements of GB / T19923-2005 (Industrial Water Quality for Urban Sewage Reuse and Utilization), but the primary investment cost of membrane treatment is high, and the membrane is easy to block, and the operation and maintenance costs are very high. There are more secondary problems

Method used

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  • Method for treating benzene series compounds in underground water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 , a groundwater polluted by benzene series was treated by grit settling→regulation→oil separation→primary and secondary flotation→activated sludge process→secondary sedimentation tank. The effluent was secondary biochemical effluent, and the water quality index was COD120mg / L, BOD 5 20mg / L, suspended matter SS150mg / L.

[0026] Use sand filter to filter the above-mentioned secondary biochemical effluent, the effective volume of the sand filter is 204m 3 ,Add Φ0.5~1.0mm, Φ1.0~2.0mm and Φ2.0~4.0mm quartz sand filter materials (commercially available) in the filter from top to bottom, the hydraulic retention time is 40min, and the average filtration rate is 7.5 m / h. More than 80% of SS in the secondary biochemical effluent can be removed by quartz sand filtration to ensure that the SS in the ozone oxidation tank does not exceed 30mg / L, so as to avoid the consumption of SS prior to the aromatic compounds dissolved in water due to the non-selectivity of o...

Embodiment 2

[0031] A waste water polluted by benzene series was treated by adjustment-oil separation-vortex air flotation-dissolved air flotation-activated sludge method, and the treated effluent COD was 106mg / L, BOD 5 It is 19mg / L, and SS is 120mg / L. Adopt the various steps and methods mentioned in the content of this recipe in turn, and carry out filtration pretreatment with a sand filter. The hydraulic retention time of the sand filter is 30 minutes, the backwash time period is 48 hours, and the SS after treatment is 22mg / L. The effluent from the sand filter enters the ozone contact oxidation tank. Under the catalytic action of the catalyst, the hydroxyl radicals generated by the decomposition of the ozone will produce intermediate products such as acetic acid and propionic acid from the refractory pollutants. The dosage of the catalyst ferrous sulfate is 3mg / L, Suspended filler is added to the ozone contact oxidation tank to increase the gas-liquid contact surface area; the dosage of...

Embodiment 3

[0034] A groundwater polluted by chemical industry is treated by grit settling→regulation→oil separation→primary and secondary flotation→oxidation ditch→secondary settling tank. The COD of the treated secondary effluent is 98mg / L, BOD 5 It is 14mg / L, and SS is 137mg / L. Adopt the steps and methods mentioned in the content part of this recipe successively, and carry out filtration pretreatment with a sand filter, the hydraulic retention time of the sand filter is 45min, and the SS after treatment is 30mg / L. The effluent from the sand filter enters the ozone contact oxidation tank. Under the catalytic action of the catalyst, the hydroxyl radicals generated by the decomposition of the ozone will produce intermediate products such as acetic acid and propionic acid from the refractory pollutants. The dosage of the catalyst ferrous sulfate is 2mg / L, Suspended filler is added to the ozone contact oxidation tank to increase the gas-liquid contact surface area; the dosage of ozone is 4...

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Abstract

The invention provides a method for treating benzene series in groundwater. In the method, the groundwater polluted by benzene series is firstly subjected to sand filtration pretreatment, and the SS of the effluent from the sand filter does not exceed 30mg through the filtering action of the quartz sand filter material. / L, then the water from the sand filter enters the ozone contact oxidation tank, under the catalysis of the catalyst, the ozone decomposes the aromatic compounds in the wastewater into small molecule aliphatic hydrocarbons, and finally reduces the COD content in the wastewater through the biodegradation of BAF, and at the same time The unique adsorption and filtration of BAF can effectively reduce SS and form a stable effluent quality. Beneficial results of the present invention: the method has high COD removal efficiency, ensures that the effluent COD index is stable below 80 mg / L, and meanwhile has low investment and operation costs.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a method for treating benzene series in groundwater. Background technique [0002] The components of pollutants in groundwater polluted by chemical sewage are complex. In addition to general pollutants, there are ammonia, ammonia nitrogen, sulfide, thiocyanate, cyanide, phenol, benzopyrene, etc. The chemical oxygen demand (COD ) content is relatively high, there are many aromatic compounds that are difficult to biodegrade, and the treatment is more complicated. [0003] At present, the treatment of groundwater polluted by benzene series mainly adopts the old process of flotation and biochemistry, among which the biochemical unit mostly adopts the traditional activated sludge process or A / O, oxidation ditch and SBR process. The wastewater treated by this process is generally called secondary biochemical effluent, and its COD content is basically around 120-150mg / L, and it is...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/32
CPCC02F9/00C02F1/001C02F1/725C02F1/78C02F3/02C02F2101/32C02F2101/322C02F2301/08C02F2305/02
Inventor 梁晶刘志成杨锦波
Owner NANJING POLYTECHNIC INSITUTE
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