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Method of removing sulfate radical and hexavalent chromium from industrial waste water through sulfate reducting bacteria activated sludge-[alpha]-Fe2O3 coupling process

A technology of industrial wastewater and activated sludge, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of low microbial tolerance and limited application, and achieve saving The effect of reducing energy consumption and reducing investment costs

Inactive Publication Date: 2015-11-11
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the simple activated sludge technology also has some problems. The low tolerance of microorganisms to toxic pollutants is one of the important aspects, which limits its practical application to a large extent.

Method used

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  • Method of removing sulfate radical and hexavalent chromium from industrial waste water through sulfate reducting bacteria activated sludge-[alpha]-Fe2O3 coupling process
  • Method of removing sulfate radical and hexavalent chromium from industrial waste water through sulfate reducting bacteria activated sludge-[alpha]-Fe2O3 coupling process
  • Method of removing sulfate radical and hexavalent chromium from industrial waste water through sulfate reducting bacteria activated sludge-[alpha]-Fe2O3 coupling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Pass the self-prepared improved Postgate'sB medium into 10L reactor 1 (figure 1 ). The composition of the medium is: 1.479gL -1 Na 2 SO 4 ;0.665gL -1 K 2 HPO 4 ·3H 2 O; 1.0gL -1 NH 4 Cl; 0.816gL -1 CaCl 2 ;3.383gL -1 MgCl 2 ·6H 2 O; 0.685gL -1 KCl; 1gL -1 Yeast extract; 0.1gL -1 Ascorbic acid; 2gL -1 COD. Then 7-20 wt% of SRB activated sludge was inoculated into the medium. Under the condition of temperature 25°C, batch operation mode was adopted for culturing. When SO in the culture medium 4 2- Concentration below 0.15gL -1 When the sludge culture device is still, the supernatant is discharged, and the same volume of fresh medium is added to continue the culture. When the SO of SRB activated sludge 4 2- When the reduction rate is fast and stable, the cultivation of SRB activated sludge is successful. The sludge cultivation device is left to stand, and the supernatant is discharged to obtain a concentrated SRB activated sludge suspension. The pr...

Embodiment 2

[0024] will contain SO 4 2- The waste water of Cr(VI) and the concentrated SRB activated sludge obtained in Example 1 are mixed in reactor 1 and ZVI is added to remove SO 4 2- and Cr(VI)( figure 1 ), while adding sodium lactate to provide enough COD to maintain the biological activity of SRB activated sludge, and finally form 7gL -1 of the suspension. SO 4 2- , Cr(VI), COD and α-Fe 2 o 3 (scale 30nm) initial concentrations were 2000, 60, 4000 and 500mgL -1 . The operating conditions are as follows: the initial pH is 2.0-9.0, the stirring speed is 50-100 rpm, the reaction temperature is 15-35° C., and the total reaction time is 5-15 days. After the reaction, the reactor was left standing for solid-liquid separation. The preferred operating conditions are: the initial pH is 6.0, the stirring speed is 75 rpm, the reaction temperature is 25° C., and the total reaction time is 10 days. Under optimal conditions, within 2 hours of reaction, the removal rate of Cr(VI) in w...

Embodiment 3

[0026] Treat SO in Example 2 4 2- The supernatant obtained after and Cr(VI) was mixed with H 2 o 2 The solution was mixed in 10L reactor 2 ( figure 1 ), and adding catalyst Cu to it 2 O (the scale is 50nm), the reaction time is 1-6h, and the S(-II) in the supernatant is removed. The preferred operating conditions are: H 2 o 2 The molar ratio with S(-II) is 1:1, Cu 2 O dosage is 1gL -1 , The reaction time is 3h. After the reaction finishes, the removal rate of S(-II) in the supernatant reaches 100%, and the oxidation product does not contain sulfate radicals, which are all referred to as S(-II). 8 The elemental form of sulfur exists. and due to Cu 2 The adsorption of O can also enrich and recover elemental sulfur to a certain extent.

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Abstract

The invention discloses a method of removing sulfate radical (SO4<2->) and hexavalent chromium (Cr(VI)) from industrial waste water through sulfate reducting bacteria (SRB) activated sludge-[alpha]-Fe2O3 coupling process and belongs to the technical field of salt-containing heavy metal waste water treatment. The method includes the following steps: a) cultivating SRB activated sludge with a modified Postgate's B culture medium in a batch reactor in a batch operation manner; b) after precipitation, discharging supernatants to obtain concentrated SRB activated sludge; c) mixing the waste water containing SO4<2-> and Cr(VI) with the concentrated SRB activated sludge, adding [alpha]-Fe2O3 (in the size of 30 nm) into the mixture to remove the SO4<2-> and Cr(VI) at the removal rate of 96.5% and 99.9% respectively; and d) mixing the supernatants with H2O2 and adding a catalyst Cu2O (in the size of 50 nm) to remove the S(-II) in the supernatants, wherein the removal rate of the S(-II) is 100%. The invention provides the high-efficient and low-cost method of removing SO4<2-> and Cr(VI) from the industrial waste water, and meanwhile because of the adsorption effect of Cu2O, elemental sulfur in discharged water can be enriched and recycled.

Description

technical field [0001] The invention relates to a synchronous removal of SO 4 2- and Cr(VI), especially involving a method utilizing sulfate-reducing bacteria activated sludge-α-Fe 2 o 3 Synchronous removal of SO from industrial wastewater by coupled processes 4 2- and Cr(VI) methods. Background technique [0002] Mine wastewater contains high concentrations of SO 4 2- and Cr(VI). The discharge of high concentrations of sulfate into the environment will lead to acidification of water bodies and affect the growth of aquatic organisms; pollute the soil and form insoluble sulfate precipitation, which is soil compaction. Cr(VI) has high mobility, and Cr(VI) has high mutagenicity, carcinogenicity and teratogenicity to all living organisms, and its strong oxidative property can also destroy the cells of organisms. Therefore, as wrong on SO 4 2- Effective removal of Cr(VI) and Cr(VI) will have extremely adverse effects on the aquatic environment and human health. Tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/22
Inventor 刘莹周天旭韩煦
Owner TIANJIN POLYTECHNIC UNIV
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