多孔板水力空化对降解化工废水的影响

Effect of hydrodynamic cavitation due to triangular orifices plate on degradation of chemical wastewater

水力空化是一种新型的高级水处理技术。利用自主设计研发的水力空化装置,采用三角形孔口多孔板作为水力空化反应器对化工废水进行处理。结果表明:(1)随着运行时间延长,COD降解率增大,当运行到一定时间后,COD降解率总体趋于稳定。(2)孔口数量相同,孔口越大则COD降解率越大。(3)孔口尺寸相同,孔口数量越多则COD降解率越大。(4)COD降解率受COD初始浓度的影响呈现先增后减的趋势,每块多孔板都存在一个最优COD降解率的最佳COD初始浓度。(5)酸性和碱性环境下均不利于水力空化作用对化工污染物的降解,中性环境下COD降解率最大。

Hydrodynamic cavitation is a new advanced wastewater treatment technology.The triangular orifices plates was used as the hydrodynamic cavitation reactor to degradate chemical wastewater in the self-developed cavitation device.Experimental results showed that：（1）the degradation rates of COD increased with increasing the treatment time,however,upon reaching a certain time,the extent of degradation tended to be stable.（2）The degradation extent increased with an increase in the size of orifice based on the same number of orifices.（3）The degradation rate increased with an increase in the number of orifice based on the same size of orifice.（4）With an increase in the initial concentration,the degradation rates increased first,and then tended to decrease,there existed an optimal initial concentration for degradation of each orifices plate.（5）Both acidic and alkaline medium went against the degradation of chemical wastewater by hydrodynamic cavitation,the greatest degradation rates obtained in the neutral medium.