Gas stripping internal circulation type treatment process and system for treating acid mine wastewater by utilizing SRB

A technology for acid mine wastewater and treatment process, applied in sedimentation treatment, multi-stage water treatment, water/sewage treatment and other directions, can solve the problems of high effluent COD, inability to convert, complex process, etc., and achieve high sulfate reduction rate and effluent. The effect of low COD and high sulfide production

Inactive Publication Date: 2019-11-22
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0003] Chinese patent CN 101434916A discloses a sulfate-reducing bacterium and its treatment process for acidic mine wastewater. The sulfate-reducing bacterium uses sodium lactate as an electron donor to treat acidic mine wastewater and produce sulfide for precipitation of heavy metal ions in step-by-step precipitation tanks. ;This process has the problem of effluent COD, the process is relatively complicated, and it is not economical enough for resources (nitrogen is not recycled)
Chinese patent CN 106868302A discloses sulfate-reducing bacteria and its process for recovering valuable metals in mine wastewater, using sulfate-reducing bacteria with high-concentration organic wastewater as an electron donor to treat acid mine wastewater to produce sulfide for heavy metal ion precipitation , and combined with the aerobic process to utilize the remaining carbon source; the process is complex, there is the problem of reduced sulfate reduction efficiency (susceptible to inhibition by sulfide toxicity) and the additional cost of the aerobic process
[0004] Acid mine wastewater has the characteristics of low pH, high heavy metals and sulfates. Direct contact between sulfate reducing bacteria and acid mine wastewater will be inhibited by the toxicity of acid and heavy metals, resulting in low sulfate reduction efficiency; the electron donor content in acid mine wastewater The growth and metabolism of sulfate-reducing bacteria need to be completed with an additional electron donor. Commonly used organic electron donors (such as lactate, ethanol, etc.) sulfate-reducing bacteria cannot completely transform them in a short time, resulting in high COD in the effluent. question

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  • Gas stripping internal circulation type treatment process and system for treating acid mine wastewater by utilizing SRB

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Experimental program
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Effect test

Embodiment 1

[0050] Utilize SRB to deal with the circular treatment process of acid mine wastewater, comprising the following steps:

[0051] S1, feed N into all reaction zones 2 , blow off the reaction zone to a reducing atmosphere with an oxygen content of 3.9 mg L -1 ;

[0052] S2. Using gas as an electron donor, pass through the gas containing sulfate-reducing bacteria and SO 4 2- The biochemical reduction sulfur production reaction is carried out in the gas stripping reaction zone of the waste water, and the gas stripping reaction zone produces sulfur-containing 2- biochemical effluent and H 2 S;

[0053] S3, will contain S 2- The biochemical effluent is sent to the second reaction precipitation area; H 2 S with flowing N 2 together into the first reaction precipitation zone, H 2 S precipitates with heavy metals in the acid mine wastewater in the first reaction precipitation zone, recovers heavy metal sulfides and refined sulfide ores, and removes N in the first reaction prec...

Embodiment 2

[0056] Utilize SRB to deal with the circular treatment process of acid mine wastewater, comprising the following steps:

[0057] S1, feed N into all reaction zones 2 , blow off the reaction zone to a reducing atmosphere, and the oxygen content is 3.0mg·L -1 ;

[0058] S2, the H 2 As an electron donor, feed with sulfate-reducing bacteria and SO 4 2- The biochemical reduction sulfur production reaction is carried out in the gas stripping reaction zone of the waste water, and the gas stripping reaction zone produces sulfur-containing 2- biochemical effluent and H 2 S;

[0059] S3, will contain S 2- The biochemical effluent is sent to the second reaction precipitation area; H 2 S with flowing N 2 together into the first reaction precipitation zone, H 2 S precipitates with heavy metals in the acid mine wastewater in the first reaction precipitation zone, recovers heavy metal sulfides and refined sulfide ores, and removes N in the first reaction precipitation zone 2 sent ...

Embodiment 3

[0063] Utilize SRB to deal with the circular treatment process of acid mine wastewater, comprising the following steps:

[0064] S1, feed N into all reaction zones 2, blow off the reaction zone to a reducing atmosphere, and the oxygen content is 2.5 mg·L -1 ;

[0065] S2. Using CO as an electron donor, pass through the solution containing sulfate-reducing bacteria and SO 4 2- The biochemical reduction sulfur production reaction is carried out in the gas stripping reaction zone of the waste water, and the gas stripping reaction zone produces sulfur-containing 2- biochemical effluent and H 2 S;

[0066] S3, will contain S 2- The biochemical effluent is sent to the second reaction precipitation area; H 2 S with flowing N 2 together into the first reaction precipitation zone, H 2 S precipitates with heavy metals in the acid mine wastewater in the first reaction precipitation zone, recovers heavy metal sulfides and refined sulfide ores, and removes N in the first reaction ...

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Abstract

The invention discloses a gas stripping internal circulation type treatment process and a gas stripping internal circulation type treatment system for treating acid mine wastewater by utilizing SRB. The process comprises the steps of stripping a reaction zone to a reduction atmosphere, carrying out a biochemical reduction sulfur production reaction, carrying out a first precipitation reaction andcarrying out a second precipitation reaction; the system comprises a first precipitation reaction device, a second precipitation reaction device, a gas stripping reaction device and a nutrient solution storage device. According to the method, the influence of multiple (acid, heavy metal and sulfide) toxicity inhibition on the sulfate reduction efficiency can be avoided; in addition, sulfate reducing bacteria in the gas stripping reaction device are high in activity and quick in alkali production, the pH of the acid mine wastewater in the second precipitation reaction device can be directly neutralized to be neutral, pretreatment of the acid mine wastewater is not needed, and the cost is reduced; the sulfate reduction rate in the gas stripping reaction device is high, the sulfide yield is high, heavy metal ions in the acid mine wastewater in the precipitation reaction device can be rapidly removed, and meanwhile valuable metal is recycled.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to an air-lift internal circulation treatment process and system for treating acid mine waste water by using SRB. Background technique [0002] The use of sulfate-reducing bacteria (Sulfate-Reducing Bacteria, referred to as SRB) to treat acidic mine wastewater (Acidic Mine Drainage, referred to as AMD) is to reduce the sulfate in acidic mine wastewater to sulfide through the biological reduction reaction of dissimilatory sulfate. The substances can react with different heavy metals to form precipitates to remove heavy metal ions in wastewater and recover valuable metals. The alkalinity generated in the bioreduction reaction can neutralize acidic mine wastewater. The method has the characteristics of low cost, strong applicability, and the recovery of valuable metals. Therefore, it has become the main technology for acid mine wastewater treatment. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/34C02F1/20C02F101/20C02F103/10
CPCC02F1/20C02F1/5281C02F3/345C02F9/00C02F2001/007C02F2101/20C02F2103/10C02F2301/08
Inventor 胡学伟祝传静田森林黄建洪李英杰
Owner KUNMING UNIV OF SCI & TECH
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