Study On The Treatment Of Wastewater By Photoelectrochemical Oxidation

The demand on improving environmental quality has been increased by present people, but the pollutant released to environment has been more and more along with the development and advancement of society. As well as the other environmental problems, people have paid more attention to the water body pollution contaminated by organic materials. Meanwhile, the controlling and monitoring technique for aquatic pollution has been improved despite some still existed technical problems.Based on the principle of photoelectrochemical oxidation and the characteristic of printworks wastewater, the study on the treatment of printworks wastewater as well as refinery wastewater and natatorium water by photoelectrochemical oxidation has been carried out. The results indicated that the COD value of the printworks wastewater was decreased from 750-850 mg/L to 130-110 mg/L after the treatment of photoelectrochemical oxidation, and the color of the wastewater changed from black to achromatous. Meanwhile the pungent smell of wastewater was completely disappeared suggesting that the wastewater after the treatment reached the secondary standard of China.When investigating the effect of reaction time on the treatment efficiency, the author found that in the short time after reaction starting the color of wastewater changed rapidly as well as the value of COD. But when the reaction went through some given time, the trend of changing was slowly. When investigating the effect of catalyzer on the treatment efficiency, the author found that the addition of catalyzer composed mainly by metal ion facilitated the degradation of wastewater, and the catalyzer quantity would affect the degradation efficiency. Those results suggested that the photoelectrochemical oxidation was applicable for treatment of printworks wastewater. The application of photoelectrochemical oxidation for treatment of refinery wastewater and natatorium water was also proved effectively. After treatment of natatorium water, the total bacteria count and coliform count of water reached the health standards for drinking water of China.In order to resolve some problems on the preparation of nanomaterials by electrochemical method such as the instability of grain size and thickness of titanium dioxide membrane, the infirmness of binding capacity between membrane and ground substance, which would thus affect the fidelity of mensuration results and the life-span of transducer, the advanced preparation of titanium dioxide nanomaterials by electrochemical method was studied in the present paper.The optimal condition for preparation of titanium dioxide nanomaterials by electrochemical method was obtained via investigating the effect of annealing condition, block copolymer, aging time, number of spreading layers and ground substance on the electrode morphologies, as well as the effect of aging time, number of spreading layers, ground substance, the kinds of water, the concentration of organic matter and electric potential of electrolysis on the photoelectricity response. The optimal condition for preparation of titanium dioxide nanomaterials was as follows: Firstly, the presoma was prepared by mixture of polymer, acidity regulator, anhydrous ethanol and surfactant according to some ratio; secondly, the surface of ground substance was daubed by the former presoma and then laid for given time at some condition; finally, the titanium dioxide nanomaterials was completed by calcinations. The titanium dioxide nanomaterials prepared by this method have better morphologies. The correlative studies proved that the transducer of titanium dioxide nanomaterials had better catalytic activity and fidelity, lower cost and longer life-span.