含盐水的电化学消毒试验研究

Experimental study of the electrochemical disinfection of the saliferous water

采用自行研制的电化学消毒器对不同含盐量的配水进行了系统的消毒试验,从而得到了用电化学法消毒的杀菌率与操作条件之间的关系,确定了电化学消毒反应器的最佳运行条件。结果表明,电化学消毒器的杀菌率随电流、停留时间和盐度的增加而提高。在盐度为3%(NaCl质量分数),停留时间为5.0 s时,杀菌率可达到99.464%,此时处理每立方米水用电量仅为0.003 kW·h;在盐度为0、停留时间为10.0 s时,杀菌率可达到90%,此时处理每立方米水用电量为0.010 7 kW·h。研究表明,电化学消毒器的消毒效果良好,耗电量很低。

The paper is engaged in an experimental study of the electrochemical disinfection of the saliferous water. Disinfection is an important technology for impure water or sewage treatment, aiming to prevent the disease transfer through water systems. In this research, an electrochemical disinfection device was designed to kill the bacteria in synthetic water with different salinities. The principle of electrochemical disinfection lies in that the electric field between the two electrodes can produce substances with the disinfection characteristics. Our experiments help to reveal the relationship between the disinfection efficiency and operating conditions, with the optimal operating conditions established. The disinfection efficiency can reach 99.464% when the salinity keeps 3% and the retention time is 5.0 s. Under this condition, the power is needed at only 0.003 kW· h/m^3 water; while the disinfection efficiency can reach 90% on the condition that the salinity is 0% and the retention time is 10 s, and the power is 0.0107 kW· h/m^3 water. Thus our research demonstrates that the electrochemical disinfection device is high in efficiency and low in electriurban consumption. In addition, it is possible to improve the efficiency of disinfection on the condition of increasing current and retaining time. The results also indicate that the methods enjoys some special advantages in potential applications in disinfection of sea water or fresh water mixed with sanitary contents, recycling of farm irrigation water, sea water for fish and shrimp farming as well as the effluent of municipal sewage treatment plants.