Device and method for treating difficultly degraded organic waste water by plasma technology

Abstract

The invention discloses a device and a method for treating difficultly degraded organic waste water by a plasma technology. The device is characterized in that the device comprises a low-temperature plasma tank; a side of the low-temperature plasma tank is provided with a water distribution tank; the water distribution tank is communicated with the low-temperature plasma tank by water distribution pipes; the water distribution pipes comprises a main water distribution pipe and multiple perforated water distribution branch pipes; the perforated water distribution branch pipes penetrate transversely the low-temperature plasma tank and are hung with a metal wire mesh; a water collecting tank is arranged in the low-temperature plasma tank and is located below the metal wire mesh; a high voltage pole is arranged in the low-temperature plasma tank; the high voltage pole and the metal wire mesh are arranged at an interval; and the high voltage pole is connected with an external power supply.The method comprises the following steps of assembling all the parts of the device, enabling organic waste water to form a uniform liquid film on the metal wire mesh and to flow down, and carrying out destroy and decomposition of pollutants by active substances produced by high voltage pole discharging. The device has a small floor space, is suitable for large-scale treatment, has a high active free radical yield and can improve treatment effects of difficultly degraded organic waste water.

Description

technical field [0001] The invention relates to an organic wastewater treatment device and method, in particular to a device and method for treating refractory organic wastewater by utilizing plasma technology. Background technique [0002] With the rapid development of petrochemical, plastic, synthetic fiber, coking, printing and dyeing and other industries, various wastewater containing a large amount of refractory organic pollutants has increased correspondingly, and their entry into water bodies has caused serious pollution to the environment. Contains toxic and refractory organic pollutants including polycyclic aromatic hydrocarbons, halogenated hydrocarbons, heterocyclic compounds, organic compounds, organophosphorus pesticides, surfactants, and organic dyes. The common characteristics of these substances are high toxicity, complex components, high chemical oxygen consumption, and it is difficult or impossible to meet the technical and economic requirements of purifica...

AI Technical Summary

Problems solved by technology

At present, the methods of using high-voltage pulse discharge to treat organic wastewater mainly include submerged and horizontal (or inclined) liquid surface high-voltage pulse discharge forms, in which submerged discharge needs to blow in air, and there are many supporting facilities; horizontal (or inclined) liquid surface discharge can only Single-sided discharge, the two methods occupy a large area and cannot be applied to large-scale treatment, and the gases such as ozone generated by the liquid surface discharge method cannot be used, there is uneven mixing, dead angles are generated, and the yield of active free radicals is not high (active free radicals Radicals refer to active free radicals such as ??OH, ??HO2, ??O, and highly oxidizing O 3 ), low diffusion and migration rate of free radicals into the liquid, etc., resulting in poor organic wastewater treatment effect

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