Self-water-absorption and self-power-generation type water treatment device and method based on sandwich structure electrode

Abstract

The invention provides a self-water-absorption and self-power-generation type water treatment device and method based on a sandwich structure electrode. The device comprises the sandwich structure electrode, a water inlet tank and a water production tank, the sandwich structure electrode is of a double-anode-single-anode structure composed of an air anode, a separation material, a thin film cathode, a separation material and an air anode which are stacked in sequence; the separation material is in contact with the air positive electrode and the film negative electrode on the two sides, the two ends of the separation material are exposed out of the contact surface, the two-layer separation material with one exposed end is used for being placed in water of the water inlet tank, and the two-layer separation material with the other exposed end is communicated with the water production tank; the separation material is a porous film material which has water absorption and is non-conductive, and the thickness of the porous film material is less than or equal to 1mm; and the thin film cathode and the air anode are respectively connected with the electric equipment through wires and are used for supplying power to the electric equipment. The device has a complete self-powered technology with low internal resistance, high electricity yield and no need of external electric energy.

Description

technical field [0001] The invention relates to the technical field of metal-air batteries and water treatment, in particular to a self-absorbing water self-generating water treatment device and method based on a sandwich electrode. Background technique [0002] In recent years, self-powered sustainable water purification technology has become a research hotspot in the field of water pollution control. How to realize wastewater treatment while generating electricity and recovering valuable substances is the common goal of researchers. In the prior art, when the wastewater is treated, the inflow and outflow of the wastewater needs to be driven by a power supply device such as a peristaltic pump, which makes the advantages of a completely self-powered water treatment device more significant. Patent CN201911135030.2 studies the water treatment and recovery device and method based on metal-air batteries, and constructs a water treatment method based on metal-air batteries. Alth...

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Problems solved by technology

Patent CN201911135030.2 studies the water treatment and recovery device and method based on metal-air batteries, and constructs a water treatment method based on metal-air batteries. Although it can realize synchronous wastewater treatment and power generation, it cannot achieve the purpose of complete self-power supply; the patent CN201911287298.8 has developed water treatment devices and methods based on iron-air batteries, but most of them also require an external power source to achieve efficient circulation and replenishment of wastewater; and based on the water treatment device based on metal-air batteries proposed in existing patents The electrode spacing of the positive and negative electrodes is generally at least at the cm level or even higher. Usually, the power generation efficiency of metal-air batteries is restricted by the internal resistance of the battery. Therefore, a larger electrode spacing will inevitably increase the internal resistance of the battery and reduce the power and efficiency of power generation.

At the same time, the power production efficiency of the battery is also restricted by the negative electrode power per unit mass. How to increase the power production per unit negative electrode mass has also become a bottleneck in the existing technology.

For the anode material with a thickness of cm, although it can provide more theoretical power generation capacity, due to the passivation problem during its use, the material inside the anode cannot be further utilized

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