Device for coprocessing heavy metal waste water and organic waste water and generating electric power

Abstract

The invention provides a device for coprocessing heavy metal waste water and organic waste water and generating electric power. The device comprises an electrolytic cell which is separated into an anode chamber and a cathode chamber by a bipolar membrane, wherein an anode and a cathode are respectively arranged in the anode chamber and the cathode chamber, the anode and the cathode are connected with a resistor through a lead, the anode is composed of electric power generating microbes and an anode substrate, the cathode is made from metallic titanium with electrochemical inertia or carbon materials, the anode chamber contains the waste water containing organic pollutants, and the cathode chamber contains the heavy metal waste water. According to the invention, the organic pollutants are oxidized into carbon dioxide by the electric power generating microbes attached to the anode in the same electrochemical cell, and electrons and protons can be simultaneously released, the protons can combine with hydroxyls dissociated from the bipolar membrane to generate water, while the electrons can be transmitted to the cathode by an external circuit, the electrons can reduce the heavy metal in the heavy metal waste water to metal elementary substances and the metal elementary substances deposit on the surface of the cathode, and the protons dissociated from the bipolar membrane can combine with negative ions to generate acid or can be neutralized to water in the cathode chamber.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment and applied chemistry, and in particular relates to a device for synergistically treating heavy metal wastewater and organic wastewater and generating electricity. Background technique [0002] Wastewater polluted by organic matter exists widely. Organic matter in waste water can often be oxidized by microorganisms or oxidants into carbon dioxide and release energy. The traditional aerobic treatment process is to decompose organic matter through aerobic microorganisms to purify the water quality, while aerobic treatment The energy generated by the oxidation of organic matter in the process is released directly into the environment. At present, microbial fuel cell technology has been used to convert energy into electrical energy while oxidizing organic wastewater. However, in this technology, the cathode often reduces oxygen to water, and the overall reaction is that organic ...

AI Technical Summary

Problems solved by technology

Wastewater polluted by heavy metals also widely exists in printed circuit boards, mining, metal smelting and other industries. Medium energy exists stably, direct discharge not only causes serious environmental pollution, but also causes waste of precious metals

Traditional techniques can only separate heavy metal ions by chemical precipitation. In order to recover simple metals, the precipitation still needs to be further reduced at high temperature, which consumes a lot of chemicals and energy.

Although there have been studies using microbial fuel cell technology to reduce and recover heavy metal ions at the cathode, the components of the heavy metal wastewater involved are often too single, and the simulated wastewater prepared with simple heavy metal salts is generally used, without considering the influence of complex ions and pH value

Moreover, the use of proton exchange membrane as the diaphragm cannot effectively prevent the influence of pH gradient on the performance of anode microorganisms, so that the system cannot run stably for a long time

Images