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Method for synchronously recycling heavy metal in garbage leachate and acid mine drainage waste

A technology for landfill leachate and acid mines, applied in chemical instruments and methods, improvement of process efficiency, multi-stage water/sewage treatment, etc., can solve problems such as no simultaneous removal of heavy metal ions, and achieve good removal effect

Active Publication Date: 2015-07-22
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no public report on the simultaneous removal and recovery of heavy metal ions in acid mine drainage and landfill leachate

Method used

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  • Method for synchronously recycling heavy metal in garbage leachate and acid mine drainage waste
  • Method for synchronously recycling heavy metal in garbage leachate and acid mine drainage waste
  • Method for synchronously recycling heavy metal in garbage leachate and acid mine drainage waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present embodiment tests the optimum selection of landfill leachate and acid mine drainage mixing ratio according to the following steps:

[0023] Take an appropriate amount of landfill leachate and a pyrite acid mine drainage, respectively according to m(COD) / m(SO 4 2- ) ≈ 0.5, 1, 3, and 4 to form a mixed solution. The total amount of the mixed solution is 500mL. At the same time, the pure landfill leachate Leachate is used as a comparison. Suitable m(COD) / m(SO 4 2- ) ratio, the experimental results are as figure 1 shown. Due to the low sulfate concentration contained in the landfill leachate, the S produced 2- Also less, less than 3mmol / L; in the mixed solution of the 4 groups, m(COD) / m(SO 4 2- ) in response groups with higher values ​​of S 2- More and produce S in the early stage of reaction 2- The rate is faster. m(COD) / m(SO 4 2- ) is 3 in the experimental group S 2- The concentration is slightly higher than m(COD) / m(SO 4 2- ) is the experimental ...

Embodiment 2

[0025] a. According to m(COD) / m(SO 4 2- ) ≈ 3 mix the landfill leachate on a tailings pond and the drainage of a pyrite acid mine nearby, adjust the pH to 7.5 with 1mol / L NaOH solution to obtain a mixed solution, and then place it in 4L for anaerobic reaction device. The main components and contents of the mixture are shown in Table 1.

[0026] Table 1m(COD) / m(SO 4 2- ) ≈ 3, the main components and contents of landfill leachate and a pyrite acid mine drainage mixture

[0027]

[0028] b. Charge argon into the anaerobic reactor operated in step a to replace the air in the reactor, so that the reaction environment remains anaerobic.

[0029] c. Control the temperature of the anaerobic reactor in step b at 30-35°C, add the mixed solution as influent into the anaerobic reactor, control the hydraulic retention time of the reactor at the initial stage of 30 days, and continue to run until COD The removal rate reaches 90%, and the sulfate removal rate is not less than 80%, m...

Embodiment 3

[0038] The benefit description of the inventive method applied in actual sewage treatment plant:

[0039] A landfill site in Ma'anshan, Anhui Province is located on a tailings pond, with a daily output of 150 tons of landfill leachate, and a nearby pyrite mine produces about 80 tons of acidic mine drainage on a daily basis. An anaerobic sewage treatment pool with a working volume of 30,000 cubic meters is built in the landfill.

[0040] Water quality characteristics of landfill leachate and acid mine drainage: COD of landfill leachate is about 50000mg / L, NH 4 + -N 2000mg / L; in acidic mine drainage, sulfate radical 29975mg / L, pH 2.75, COD 429.6mg / L, total iron 133mg / L. According to m(COD) / m(SO 4 2- ) ≈ 3 Mix landfill leachate and acid mine drainage, and then process a total of 230 tons of mixed solution per day. Based on the calculation that the hydraulic retention time of the anaerobic sewage tank is 20 days, 90 tons of anaerobic sludge will be discharged every 30 days. ...

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Abstract

The invention discloses a method for synchronously recycling heavy metal in garbage leachate and acid mine drainage waste. The method is characterized by comprising the following steps: mixing the garbage leachate and the acid mine drainage waste according to a certain proportion, adding the mixture into a stably running anaerobic reactor, reducing sulfate in the waste water to generate S<2-> by utilizing sulfate reducing bacteria predominant in anaerobic microorganisms, further bonding S<2-> and heavy metal ions to form heavy metal sulfate, and further recycling heavy metal in generated solids containing the heavy metal sulfate by virtue of aerobic and anaerobic calcination methods. According to the method, difficult-to-biodegrade wastewater garbage leachate and acid mine drainage waste are treated, and in addition, the heavy metal in the wastewater garbage leachate and the acid mine drainage waste is effectively recycled, so that the method is economical and environment-friendly, and resourceful transformation in a waste treatment process is realized.

Description

1. Technical field [0001] The invention belongs to the field of heavy metal recovery and resource utilization of waste water. 2. Background technology [0002] The rapid economic development has increased the utilization of resources, and my country is a country with a relative shortage of metal resources. On the other hand, the over-exploitation of metal mine resources in various places has seriously damaged the surrounding environment and produced a large amount of acid mine waste water. Acid mine drainage refers to the acidity produced by sulfide minerals (such as coal mines, polymetallic sulfide ores) through oxidation, decomposition, and hydration to form sulfuric acid during the production process of mining, transportation, ore dressing, waste rock discharge, and tailings storage. Water: the main performance is low pH value, low chemical oxygen demand (COD) concentration, high sulfate concentration, and water contains a lot of copper, iron, zinc, aluminum, manganese, ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C22B7/00
CPCY02P10/20
Inventor 王进李玉龙岳正波罗筱枭徐诚
Owner HEFEI UNIV OF TECH
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