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Treatment method and device for sulfate and chromate compound polluted wastewater

A technology of sulfate chromate and compound pollution, which is applied in the fields of special compound water treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. Thorough, trivalent chromium is difficult to fix and other problems, to achieve the effect of good removal effect, cheap raw materials, and simple installation

Inactive Publication Date: 2018-08-21
DALIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, whether it is through microbial degradation of sulfate or Cr(VI) bioreduction, organic carbon is required to act as an electron donor. The traditional method is to add dissolved carbon sources, but due to the fluctuation of influent load, the dosage of carbon sources Difficult to control, resulting in incomplete degradation of pollutants or high effluent COD
In addition, there is also the problem that the reduced trivalent chromium is difficult to fix. When it migrates in the environment and re-enters the water body, it may cause secondary pollution

Method used

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  • Treatment method and device for sulfate and chromate compound polluted wastewater
  • Treatment method and device for sulfate and chromate compound polluted wastewater
  • Treatment method and device for sulfate and chromate compound polluted wastewater

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Experimental program
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Effect test

Embodiment 1

[0021] In the sludge domestication stage, the sludge from the secondary settling tank and 180mL of simulated wastewater containing Cr(VI) (20mg / L) were added to a 200mL stoppered Erlenmeyer flask, and 5g of degradable biological lunch boxes were added to expose to N 2 For 20 minutes, the anaerobic environment was maintained, and the acclimatization of the sludge and the filming of the biodegradable lunch box were carried out at 35°C and 150 rpm. Change the water every 5-6 days and detect the sulfate and chromium content in the supernatant. After 40 days of domestication, the sludge is black and has a strong smell of rotten eggs, and a layer of biofilm hangs on the surface of the biodegradable lunch box And sulfate and chromium achieve stable removal. At this time, it is considered that the domestication of the sludge is completed, and the film-forming of the bio-reduced lunch box is successful.

[0022] Simulated wastewater (g / L): NaSO 4 (2.5±0.5), K 2 HPO 4 0.5, NH 4 C...

Embodiment 2

[0025] In an 80mm inner diameter, 900mm high, 50g biodegradable lunch box was added to the anaerobic packed bed device, the filling height of the biodegradable lunch box was 300mm, and the simulated wastewater containing Cr(VI) (2 After 20 minutes, it enters the reactor through the control of the peristaltic pump. The stable operating conditions are: the reaction temperature is 35°C, the pH of the reaction is adjusted to 7.0, the reflux ratio is 2:1, and the hydraulic retention time is 24h.

[0026] The effluent quality is as follows (unit: mg / L): SO 4 2- : 110±10.254, S 2- : not detected, COD: not detected, Cr(VI): 1.345±0.012, Cr(III): not detected.

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Abstract

The invention provides a treatment method and device for sulfate and chromate compound polluted wastewater, and belongs to the technical field of treatment of industrial wastewater such as mine wastewater, electroplating wastewater and the like. Biodegradable meal boxes as an electronic donor, a solid carbon source and a biofilm carrier are added. According to the method, sulfate in the wastewateris effectively reduced into elemental sulfur and sulfide precipitate, hexavalent chromium is converted into trivalent chromium without secondary pollution, trivalent chromium is effectively fixed, and higher impact load resistance is achieved. The wastewater treatment method has the advantages of cheap raw materials, simple device, high impact load resistance and good removal effect. By controlling process conditions, the compound polluted wastewater with high content of sulfate and chromate is effectively treated.

Description

technical field [0001] The invention relates to a treatment method and device for sulfate and chromate composite polluted wastewater, in which a degradable biological lunch box is added as a solid carbon source and a biofilm carrier, and belongs to the technical field of treating industrial wastewater such as mine wastewater and electroplating wastewater. Background technique [0002] According to the survey, the waste water from industries such as mining, non-ferrous metal smelting and processing, electroplating, electrolysis, tanning, paint, chemical fiber and solid waste detoxification has low COD value, high concentration of sulfate and soluble heavy metal ions. Cr(VI) and other characteristics. How to realize Cr(VI) and SO 4 2- Effective treatment of compound polluted wastewater is an urgent problem to be solved in industrial wastewater treatment. [0003] Many studies have shown that the co-removal of the two can be achieved through the degradation of microorganisms...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/22
CPCC02F3/2806C02F2101/101C02F2101/22C02F2209/08C02F2209/19C02F2305/06
Inventor 金若菲张月柳广飞周集体乔森
Owner DALIAN UNIV OF TECH
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