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Method for treating acidic mine wastewater by micro-electrolysis enhanced sulfate reducing bacteria and micro-electrolysis bioreactor

A technology of acid mine wastewater and bioreactor, which is applied in the direction of electrochemical biocombination treatment, chemical instruments and methods, special compound water treatment, etc. It can solve the problems of poor tolerance of heavy metals, insufficient electron donors, low sulfate reduction rate, etc. problems, achieve low cost, improve electronic utilization, reduce cost input and energy consumption

Active Publication Date: 2020-07-03
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding biochar and iron powder to the reactor, micro-electrolysis is produced, thereby improving the ability of sulfate-reducing bacteria to treat acid mine wastewater, and solving the problem of low sulfate reduction rate and electron donor when sulfate-reducing bacteria treat acid mine wastewater. Insufficient and low pH, poor tolerance to heavy metals

Method used

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  • Method for treating acidic mine wastewater by micro-electrolysis enhanced sulfate reducing bacteria and micro-electrolysis bioreactor
  • Method for treating acidic mine wastewater by micro-electrolysis enhanced sulfate reducing bacteria and micro-electrolysis bioreactor
  • Method for treating acidic mine wastewater by micro-electrolysis enhanced sulfate reducing bacteria and micro-electrolysis bioreactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Fill the reactor with a mixed filler of iron filings and activated carbon with a mass ratio of 7:3 (volume ratio is about 1:1), add 100mL of bacterial liquid and 350mL of culture medium, and control the operating temperature of the reactor at 32±1°C ;

[0043] (2) After 2 days of stability, waste water is introduced, and the initial water intake is SO 4 2- Concentration 500mg / L, COD / SO 4 2- =2, HRT=48h, from the third day onwards, the influent flow rate is increased at a constant speed, and the hydraulic retention time is shortened to 24h after three days. After the indicators of the effluent of the reactor are stable, the reactor is considered to be started;

[0044] (3) Reduce the hydraulic retention time by 6 hours each time until the HRT reaches 12 hours. Raise influent SO 4 2- Concentration, increase about 700mg / L each time, until the concentration increases to 2500mg / L. After each influent water change, wait for the COD concentration in the effluent to...

Embodiment 2

[0054] With embodiment 1, the difference is that the reactor COD / SO 4 2- Controlled at 1.4, final influent SO 4 2- The concentration was controlled at 2000mg / L. When the indicators of the effluent were stable for 5 days, the sulfate removal rate reached 96%. The filler in the reactor was taken for biodiversity analysis. Control influent SO 4 2- Concentration is 2000mg / L, COD / SO 4 2- The ratio drops to 0.7, and the sulfate removal rate reaches 53% during stable operation. The relative abundance of SRB in the tested samples was 62.18%, including three genera of Desulfovibrio, Desulfocurvus and Desulfotomaculum.

Embodiment 3

[0065] The iron-carbon mass ratio of the filler is 4:1, and the others are the same as in Example 1.

[0066] (1) Inoculate 100mL of bacterial liquid and 350mL of medium, and control the operating temperature of the reactor at 32±1°C.

[0067] (2) After 2 days of stabilization, the initial influent SO 4 2- The concentration is 500mg / L, COD=1000mg / L, and the control HRT is 48h; from the third day, the HRT of the reactor is increased at a constant speed, and the hydraulic retention time is increased to 20h after three days;

[0068] (3) When the water outlet index of the reactor is stable, low-concentration water intake is started, and the SO 4 2- , Zn 2+ , Mn 2+ 、Cu 2+ , Fe 2+ The concentration of influent water is increased to 1200mg / L, 40mg / L, 20mg / L, 10mg / L and 5mg / L respectively, COD=2400mg / L, and HRT is increased to 18h;

[0069] (4) When the indicators of the effluent of the reactor are stable, start to increase the concentration of the influent, and the SO 4 2-...

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Abstract

The invention discloses a method for treating acidic mine wastewater by micro-electrolysis enhanced sulfate reducing bacteria and a micro-electrolysis bioreactor. By filling a reactor with an iron-carbon micro-electrolysis filler and inoculating sulfate reducing bacteria, part of metal ions in the acidic mine wastewater is rapidly reduced through a micro-electrolysis reaction between iron and carbon, the pH of wastewater is increased, and the problem that sulfate reducing bacteria are inhibited and harmed by low pH and heavy metals is solved; the sulfur reduction rate of sulfate reducing bacteria is increased through electrical stimulation generated by micro-electrolysis, and part of metals is removed in a sulfide precipitation form; Fe<3+> and alkalinity are generated, part of metals is removed in a Fe(OH)3 coagulation and hydroxide precipitate mode. Compared with other bioreactors, the micro-electrolysis bioreactor has the advantages of high sulfate and heavy metal removal efficiencyand high system stability.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for micro-electrolysis strengthening sulfate-reducing bacteria to treat acid mine wastewater and a micro-electrolysis bioreactor. Background technique [0002] At present, in the process of coal production in my country, the annual discharge of acid mine drainage (AMD) reaches 3.6 billion tons, accounting for nearly one tenth of the total discharge of industrial wastewater in the country. If it is not handled properly, it will cause environmental pollution. The damage is serious and often irreversible. The main methods to deal with it are neutralization method, wetland method and biological method. Among them, the neutralization method is likely to generate a large amount of solid waste that is difficult to handle and cause secondary pollution. The wetland method has high treatment efficiency, but it occupies a large area and is complex in management and maintenance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/00C02F103/10C02F101/10
CPCC02F3/005C02F3/345C02F2305/06C02F2103/10C02F2101/101Y02W10/10
Inventor 狄军贞徐赫王显军杨逾孟凡康贾宝新董艳荣
Owner LIAONING TECHNICAL UNIVERSITY
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