A method of using other heavy metal wastewater to strengthen the treatment of chromium-containing wastewater

A technology for heavy metal and chromium wastewater, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve secondary pollution, unrealistic, unclear effect of reducing electrode passivation, etc. problem, to achieve the effect of strengthening the effect and reducing the impact.

Active Publication Date: 2019-11-19
NANJING TECH UNIV
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AI Technical Summary

Problems solved by technology

Although it has been proposed that increasing the specific surface area of ​​the cathode electrode can moderately slow down the passivation rate of the electrode, this method is not realistic and feasible due to the high chromium content in the actual wastewater and the long-term operation of the treatment device.
In 2013, Xafenias et al. proposed for the first time that sodium lactate can be used as a Cr(III) chelating agent to reduce the passivation of the electrode under the neutral condition of the biocathode, but since sodium lactate is also an electron donor, the effect of reducing the passivation of the electrode does not unclear
In addition, removing the effect of electrode passivation by adding organic matter not only increases the cost but also causes secondary pollution

Method used

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  • A method of using other heavy metal wastewater to strengthen the treatment of chromium-containing wastewater
  • A method of using other heavy metal wastewater to strengthen the treatment of chromium-containing wastewater
  • A method of using other heavy metal wastewater to strengthen the treatment of chromium-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example illustrates the effect of different concentration ratios of Cr(VI) and Cu(II) composite wastewater on the removal of chromium by chemical cathode MFC.

[0028] Such as figure 1 The chemical cathode MFC is constructed as shown, and the MFC anode uses anaerobic digested sludge (taken from Nanjing Jiangbei Sewage Treatment Plant) as the inoculation source, the inoculation ratio is 1:2 (sludge: anolyte), and the anolyte is COD=1000 mg / L artificial organic wastewater (pH=7), and 40mmol / L potassium ferricyanide (pH=7) was used as the catholyte to domesticate the anode electrogenic biofilm. Regularly replace the cathode and anode liquids, and after the MFC has stabilized the power generation for two consecutive cycles, it is regarded as the successful start-up of the MFC anode. Thereafter, the anode chamber was replaced with fresh artificial organic wastewater, and the catholyte was replaced with chromium-copper composite wastewater with a concentration ratio of ...

Embodiment 2

[0031] On the basis of Example 1, this example illustrates the influence of different external resistance conditions on the treatment of Cr(VI), Cu(II) composite wastewater by chemical cathode MFC.

[0032] Such as figure 1 The chemical cathode MFC is constructed as shown, and the domestication of the anode electrogenic bacteria group is the same as that described in Example 1. After the anode is started successfully, the cathode chamber is added with chromium-copper composite wastewater with a concentration ratio of 1:4 of Cr(VI) and Cu(II) (pH=3), at the same time, the chemical cathode MFC with Cr(VI) wastewater added alone was used as the control experiment group, and the cathode and anode chambers were strictly closed with plugs. The external resistance of the experimental group was set to 10 Ω, 510 Ω, 1000 Ω, 2000 Ω respectively, and the circuit was connected. All MFCs were run at 25 °C for 24 h. The cathode and anode materials of the MFC are graphite plates, and the di...

Embodiment 3

[0035] This example illustrates the effect of different aeration conditions on the MFC chemical cathode treatment of Cr(VI), Cu(II) composite wastewater.

[0036] Such as figure 1The chemical cathode MFC is constructed as shown, and the anode start-up is the same as that described in Example 1. The chromium-copper composite wastewater (pH=3) with a concentration ratio of Cr(VI) and Cu(II) of 1:4 is added to the cathode chamber, and at the same time, it is added separately The chemical cathode MFC of Cr(VI) wastewater was used as the control group. The anode chamber is strictly sealed with a stopper, and the cathode chamber is respectively set under anaerobic conditions (dissolved oxygen is about 0.2 mg / L) and aerobic conditions (dissolved oxygen is about 7.03 mg / L). The external resistance is 10 Ω, and the circuit is connected. All MFCs were run at 25 °C for 24 h. The cathode and anode material of the MFC is carbon paper, and the separator is a bipolar membrane.

[0037] T...

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Abstract

The invention provides a method for enhancing chromate wastewater treatment by means of other heavy metal wastewater. A dual-chamber microbial fuel cell (MFC) cathode is used for treatment of chromate wastewater, other heavy metal wastewater is compounded in the chromate wastewater for enhancing the dechromisation efficiency. An MFC cathode is added into compound wastewater formed by compounding the chromate wastewater and the other heavy metal wastewater, electrogenesis mixed bacteria are inoculated on an anode, and organic wastewater and other organic wastes are adopted as a substrate for providing electrons required by reduction of cathode heavy metal ions. According to the method, the Cr(VI) removal rate can be improved by 180.23%, various heavy metal ions can be effectively removed and electric energy can be obtained at the same time, the novel technical way is provided for heavy metal wastewater treatment, and the significant application value on the aspects of environmental protection and resource utilization is achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and recycling, and in particular relates to a method for strengthening the treatment of chromium-containing wastewater by using other heavy metal wastewater. Background technique [0002] Chromium is an important basic raw material widely used in chemical industry, light industry, alloy materials and other fields. According to statistics, my country's annual industrial production discharges about 4 billion cubic meters of chromium-containing wastewater, which seriously pollutes the ecological environment due to extremely difficult treatment. At present, the methods for treating chromium-containing wastewater mainly include physical methods, chemical methods, ion exchange resin methods, membrane separation methods, electrocoagulation methods, and biological methods. However, these methods have the disadvantages of large energy consumption, high processing costs, and easy to produce second...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F101/22
CPCC02F3/34C02F2101/22
Inventor 吴夏芫熊晓敏贾红华雍晓雨周俊韦萍
Owner NANJING TECH UNIV
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