Device and method for degrading chlorohydrocarbon in polluted underground water

Abstract

The invention relates to a device and a method for degrading chlorinated hydrocarbon in polluted underground water. The device comprises a plurality of Bi2O3-B2O3-SrCO3 system glass tubes which are connected in series and in parallel, ultraviolet lamps arranged in the tubes and a control power supply arranged outside the tubes. The preparation method of the glass tube and the chlorohydrocarbon degradation method comprise the following steps: taking 55-85wt% of Bi2O3, 5-15wt% of B2O3 and 10-30wt% of SrCO3 components, uniformly mixing, putting into a corrosion-resistant crucible, keeping the temperature at 1050-1300 DEG C for 15-45min, molding into the glass tube, keeping the temperature at 200-400 DEG C for 13h, and carrying out annealing treatment; soaking the inner wall of the glass tubein an HCl solution with the concentration of 0.02-0.2 mol / L for 10-30 minutes, cleaning with water, and mounting an ultraviolet lamp to obtain the self-cleaning glass tube; introducing underground water containing chlorinated hydrocarbon into a self-cleaning glass tube, turning on an ultraviolet lamp, and carrying out ultraviolet irradiation treatment for 1-8h to highly remove chlorinated hydrocarbon; when the catalytic performance of the self-cleaning glass tube is reduced, recovering the catalytic performance of the self-cleaning glass tube by the HCl etching solution with the same concentration to etch again for 1-10 minutes.

Description

technical field [0001] The invention belongs to the technical field of chlorinated hydrocarbon degradation, and in particular relates to a device and method for degrading chlorinated hydrocarbons in polluted groundwater. Background technique [0002] Chlorinated hydrocarbons refer to compounds in which the hydrogen in hydrocarbon molecules is partially or completely replaced by chlorine. As important organic solvents and product intermediates, chlorinated hydrocarbons are widely used in chemical, pharmaceutical, pesticide and other fields. Due to improper use and storage, chlorinated hydrocarbons are discharged into the natural environment through volatilization, leakage, waste water discharge, etc., which have adverse effects on the environment and human health. The density of chlorinated hydrocarbons is usually higher than that of water, and they are easy to deposit at the bottom of water bodies and diffuse into groundwater, causing large-scale, long-term and continuous po...

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Problems solved by technology

[0003] In order to solve the above-mentioned technical problems, many beneficial explorations have been carried out in the prior art, and a series of chlorinated hydrocarbon pollution control technologies have been formed, such as adsorption method, stripping method, biological method and chemical method, etc., but these treatment technologies have their own defects: adsorption Although the method can efficiently adsorb chlorinated hydrocarbons, it only transfers the pollutants and cannot eliminate them; the stripping method strips the chlorinated hydrocarbons in the water to the gas phase and produces new pollution, which needs to be collected and further processed; the biological method only It is suitable for the control of low-concentration chlorinated hydrocarbon pollutants, and the biodegradation rate is slow, and the treatment cycle is long; the chemical method requires additional chemical agents to cause secondary pollution

However, the conventional photocatalytic method requires the addition of catalyst nanoparticles, and nanomaterials may still cause secondary pollution, and face the failure of catalysts and the difficulty of recycling and separation.

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