不同材料电极电-生物耦合水解法处理偶氮染料废水试验

Influence of Different Anode Materials on the Treatment of Azo Dyed Wastewater by Bio-Electrochemical Hydrolysis Method

目的考查阳极材料对活性艳红X-3B降解效果的差异.方法分别以炭毡、铝皮、铁皮为阳极,石墨柱为阴极,施加直流电场,形成电-生物水解反应器.电流密度0.071 mA/cm2,水力停留时间12 h.结果铁阳极反应器对染料质量浓度和COD去除效果最好,去除率分别为95.65%和45.94%,炭毡阳极和铝阳极反应器对染料质量浓度去除率分别为66.89%和66.36%,对COD的去除率分别为26.75%39.17%.铝阳极和铁阳极电-生物水解反应器因其存在电絮凝作用,对色度有较好的去除效果,去除率分别为65.43%和65.14%,炭毡阳极反应器为51.06%.结论三种电极材料的电-生物水解工艺处理后出水的氨氮含量出现了增高的现象.这证明水解过程并不能使偶氮染料得到彻底降解.铁-石墨电-生物水解反应器对偶氮染料废水有较好的处理效果,可有效地降低染料质量浓度.

The paper aimed to compare removal effects in azo dyed wastewater by bio-electrochemical hydrolysis method with different anode materials. Carbon felt, aluminum, iron were served as the anodes, graphite columns were served as cathodes of three apparatus. CD field, fillers and activated sludge were applied. The hydraulic retention time was 12 hours,current density is 0. 071 mA/cm2 for the test. The results showed that the reactor with iron anode was the best on the removal efficiency of dye concentration and COD, the removal rates were 95.65% and 45.94% ,but the other two were only 66.89% and 39. 17% ,66. 36% and 26.75 %. Electro-biological hydrolysis reactors with aluminium and iron anode had better removal effect on color,due to the electric flocculation existing,removal rates were 65.43% and 65.14% ,but the carbon felt one was 51.06%. All of the ammonia nitrogen from three hydrolysis reactors had a raising phenomenon. This proves that azo dyes had not been degraded in the hydrolysis process. Thus, bio-electrochemical hydrolysis reactor with iron anode was the best in the treatment of azo dyed wastewater.