Method for treating tungsten-molybdenum organic mixed waste water cleanly and thoroughly and recycling metal and hydrogen gas byproduct synchronously

Abstract

The invention belongs to the technical field of waste water treatment, and discloses a method for treating tungsten-molybdenum organic mixed waste water cleanly and thoroughly and recycling metal anda hydrogen gas byproduct synchronously. A cylindrical microbial electrolytic cell composed of an anode and a cathode is adopted; the anode and the cathode are both made of carbon-based materials suchas carbon felts and carbon fibers; the anode and the cathode are isolated by a stainless steel mesh, and the stainless steel mesh serves as an electronic output/input part; a solution in a reactor isa metal organic mixed solution composed of tungsten, molybdenum and organic matters, the concentration is 1-2,500 mg/L, the pH is 3.0-8.0, and the electric conductivity is 0.3-3 mS/cm; and the anode and the cathode are connected with a data collecting system and an external power supply through external resistors, and the external resistance value is 10-1,000 ohm. According to the novel method forremoving the tungsten-molybdenum organic waste water cleanly and thoroughly and recycling the hydrogen gas byproduct synchronously, the whole process is clean and environmentally friendly.

Description

Technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for using a microbial electrolytic cell to thoroughly treat tungsten and molybdenum and organic mixed wastewater to synchronously recover valuable metals and by-produce hydrogen. Background technique [0002] Tungsten and molybdenum are rare metals that are widely used in chemical, metallurgy, materials and other fields. In the mining, smelting, product preparation and use of tungsten and molybdenum associated mines, mixed wastewater containing tungsten, molybdenum and organic matter will be produced, which not only brings risks and hidden dangers to the environment and ecology, but also causes waste of resources. On the other hand, mining tungsten and molybdenum from mines will not only lead to the exhaustion of tungsten and molybdenum resources, but also the energy consumed during the mining process is much greater than the energy consumed by recycl...

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Problems solved by technology

Although there are also a small number of reports of single-chamber MECs processing metal-organic mixtures (Abourached et al., WaterRes 2014, 51:228-233; Wu et al., Bioresour Technol 2018, 253:372-377; CN106757117, etc.), but the processing The metal concentration is relatively low (such as 12.5mg / L Cu(II), 22.4mg / L Cd(II) or 26mg / L Zn(II)); and limited to the mixture of organic matter and a single metal

The single-chamber MECs treatment technology combined with tungsten and molybdenum organic mixed wastewater, and the report of effluent quality discharge has not yet been seen.

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