微电解-电解预处理硝基苯废水的研究

采用微电解-电解工艺处理硝基苯废水,考察初始pH值、曝气、电流密度、电极间距等因素对硝基苯和CODCr去除率的影响.结果表明:在曝气条件下,初始pH 3.0、铁屑用量200 g/L、铁炭微电解反应1 h后,硝基苯和CODCr去除率分别为63.2%和22.1%;然后采用电解法处理,在电流密度为5 mA/cm2、电极间距为2 cm、电解1 h后,硝基苯和CODCr去除率分别提高至92.3%和45.2%;废水B/C由原来的0.19上升到0.36.因此,微电解-电解工艺是一种有效的硝基苯废水预处理手段.

Study on pretreatment of nitrobenzene wastewater by internal microelectrolysis-electrolysis

An internal microelectrolysis-electrolysis process has been used to pre-treat nitrobenzene wastewater.The influences of initial wastewater pH,aeration condition,current density,and electrode distances on nitrobenzene and CODCr removal efficiencies were investigated.The results showed that internal microelectrolysis using granular activated carbon achieved 63.2% nitrobenzene and 22.1% CODCr removal efficiencies respectively,at iron chips dosage of 200 g/L,initial pH of 3.0,aeration condition and reaction time of 1 h.Then the followed electrolysis showed that up to 92.3% nitrobenzene and 45.2% CODCr could be removed under the conditions of current density of 5 mA/cm2,electrode distance of 2 cm and reaction time of 1 h.B/C ratio increased from 0.19 to 0.36.It was concluded that the internal microelectrolysis-electrolysis process is a very efficient way to pre-treat nitrobenzene wastewater.