Lithium Iron Phosphate Three-dimensional Electrode Preparation And Research Of Coking Wastewater Treatment

Water pollution in our country has faced a serious situation. Among them, the source of industrial emissions accounted for a large part of it. With the development of coking industry, the coking wastewater emissions are also increasing. As a common industrial waste water, coking wastewater composition is complicated, in the COD content and phenol content is very high, and difficult to be degraded, but the biochemical ability is poor, high toxicity, the source is widespread, so how to efficiently handle has become a important and difficult in the research of environmental protection workers in recent years.Generally speaking, the coking wastewater treatment methods including chemical and biological method, chemical method and three types of advanced oxidation process. Due to the physical and chemical method and biological material for there are many limitations of coking wastewater treatment, and with high relative molecular mass, but with poor biochemical contaminant to handle more difficult, efficiency is not high, so, not as a regular method of treatment of coking wastewater. And advanced oxidation process for the difficult degradable organic pollutants in the treatment of the biological aspects show the high efficiency, quick response, completely organic matter degradation and other advantages, can be directly mineralization through the oxidation of organic pollutants, the difficult degradation of macromolecular substances oxidation of low toxicity or non-toxic small molecular substances, after processing of poisonous and harmful contaminants or significantly lower toxicity, even disappear completely, thus become the first selection of treatment of coking wastewater.Experiments to simulate wastewater and coking wastewater as the research subject, the preparation of a new type of LiFePO₄ three-dimensional electrode, and Ti/SnO2 as anode, graphite as the cathode, the specifications of the plate is 40 mm x 60 mm x 20 mm.Using LiFePO₄ three-dimensional electrode for homemade has carried on the electrochemical reaction of phenol waste water; The coking wastewater dilution, followed by a electrochemical reaction. Initial pH value is controlled by a single variable method, current intensity, electrode spacing, electrolysis time, concentration of electrolyte and LiFePO₄ dosing quantity six reaction conditions.Using potassium dichromate method before and after electrolytic COD value, with 4- amino anti than direct spectrophotometric determination of phenol density before and after electrolytic Lin.Comparison of two-dimensional electrode method for phenol and COD removal efficiency in coking wastewater.Results show that using Li FePO₄ three-dimensional electrode treatment of coking wastewater, the removal rate of COD and phenol are under simulated wastewater, among them, the pH value, plate spacing, reaction time, current intensity, LiFePO₄ dosing quantity has a big influence on system, concentration of electrolyte system and the effect of the processing efficiency is not obvious, the same as general simulated wastewater treatment.I = 1 A in current intensity, p H = 5, D = 1 cm, t = 2 h, LiFePO₄ threedimensional electrode method for COD in coking wastewater removal efficiency reached 78.2%, the phenol removal efficiency reached 81.4%, the effect is obvious.Compared with the two-dimensional electrode method of coking wastewater treatment efficiency, under the same conditions, LiFePO₄ three-dimensional electrode method for phenol and COD removal efficiency than the two-dimensional electrode method.