Process for treating acid wastewater in mine and reclaiming valuable metals in wastewater

A technology for mine acidic wastewater and valuable metals, applied in the field of water treatment, can solve problems such as low sulfate reduction efficiency, achieve the effects of reducing inhibition, rapid separation, and reducing consumption

Inactive Publication Date: 2010-06-23
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the growth of sulfate-reducing bacteria requires additional carbon and nitrogen sources to complete. At the same time, in the reactor where sul...

Method used

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  • Process for treating acid wastewater in mine and reclaiming valuable metals in wastewater
  • Process for treating acid wastewater in mine and reclaiming valuable metals in wastewater
  • Process for treating acid wastewater in mine and reclaiming valuable metals in wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The volume of the UASB bioreactor is 3L, the volumes of the contact reactor 1 and the contact reactor 2 are 10L, and the volume of the aerobic reactor is 1L. Concentrate 5L of excess sludge from the urban sewage treatment plant to 2.5L (the sludge concentration is 5000mg / L) and pour it into the bioreactor. Take molasses wastewater (COD100000) and dilute it 100 times, pump it into the bioreactor at a flow rate of 200mL / h, and run it continuously for 10 days. Contact reactor 1, contact reactor 2 is filled with tap water, press figure 1 The connection shown is good, the pH2-3 mine acid wastewater (Cu 2+ 0.2g / L; Fe 2+ , 1.0-2.0g / L; Fe 3+ , 3g / L, SO 4 2- , 3g / L) into the contact reactor at a flow rate of 100mL / h, a reflux is set between the contact reactor I and the contact reactor II, and a reflux is set between the contact reactor II and the bioreactor, wherein the contact reaction The reflux flow rate between the reactor I and the contact reactor II was 200mL / h, an...

Embodiment 2

[0034] The volume of UASB bioreactor is 3L, the volume of contact reactor I and contact reactor II is 10L respectively, and the volume of aerobic reactor is 1L. Concentrate 5L of the remaining sludge from the urban sewage treatment plant to 2.5L and pour it into the bioreactor. Take alcohol wastewater (COD100000) and dilute it 100 times, pump it into the bioreactor at a flow rate of 200mL / h, and run it continuously for 10 days. Contact reactor I, contact reactor II is full of tap water, press figure 1After the connection is completed, the pH2-3 mine acid wastewater (Cu2+.2 / L; Fe2+, 1.0-2.0g / L; Fe3+, 3g / L, SO42-, 3g / L) is passed into the contact at a flow rate of 100mL / h Reactor, reflux is set between contact reactor I and contact reactor II, and reflux is set between contact reactor II and bioreactor, wherein the reflux flow rate between contact reactor I and contact reactor II is 200mL / h, the reflux flow rate between the contact reactor II and the bioreactor is 2L / h, afte...

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Abstract

The invention provides a process for treating acid wastewater in a mine and reclaiming valuable metals in the wastewater. The process comprises the following steps: (1) introducing the acid wastewater to a plurality of contact reactors in sequence and subsequently to a sulfate-reducing bioreactor; (2) through the control of return flow rate of a post-stage reactor, realizing the operation of each contact reactor in different pH, precipitating different metals; and (3) adopting food processing wastewater with the COD concentration of between 10,000mg/L and 100,000mg/L as a carbon source, and introducing the food processing wastewater to the sulfate-reducing bioreactor. In the process, the Cu2+removing rate in the acid wastewater of the mine reaches 99 percent, the Fe2+removing rate reaches 95 percent, the Fe3+removing rate reaches 90 percent, the pH of the processed wastewater is neutral, and the wastewater reaches the standard and can be discharged. The process has the advantages of utilizing the organic wastewater with the COD concentration of between 10,000mg/L and 100,000mg/L as the carbon source to reduce the cost of the carbon source, utilizing the design of phase splitting to reduce the inhibition of metallic ions to the wastewater, adopting return flow to reduce the inhibition of S2-ions to bacteria, and controlling the return flow rate to realize the selective precipitation of various valuable metals of the wastewater in each contact reactor on. The whole process can reduce the operating cost by 30 to 50 percent.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a process for treating acid mine acid wastewater and recovering valuable metals in the wastewater by using sulfate-reducing bacteria and organic wastewater with a COD concentration of 10,000 mg / L-100,000 mg / L. Background technique [0002] The use of sulfate-reducing bacteria to treat acid mine wastewater is to reduce the sulfate in acid mine wastewater to H through the biological reduction reaction of dissimilatory sulfate. 2 S, under different pH conditions, can use H 2 S selectively precipitates different heavy metals to form metal sulfides 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, no secondary pollution, and the ability to recover heavy metals in acidic mine wastewater. Therefor...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/58
Inventor 刘兴宇陈勃伟黄松涛刘文彦
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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