TiO_2/UV与O_3联用工艺对溴胺酸废水的预处理

Pretreatment of bromamine acid by combined TiO_2/UV and ozone

采用TiO2/UV与O3联用工艺对中低浓度溴胺酸废水进行预处理。实验结果表明,TiO2/UV与O3联用对溴胺酸的降解具有一定协同效应,本质原因是TiO2/UV与O3协同产生了更多羟基自由基。初始pH值对溴胺酸的降解效果影响不大,COD去除率基本稳定在90%～95%之间。溴胺酸废水经过2h催化降解,脱色率能达到70%以上,COD也能得到一定的去除,同时废水的B/C值能从0.030～0.043上升至0.320～0.368,可生化性得到大幅度提高,为后续生物处理创造了有利条件。

The pretreatment of bromamine acid of middle or lower level COD value is conducted by combined TiO2/UV and ozone. The experimental results indicate that a synergic effect of combined TiO2/UV and ozone on the decomposition of bromamine acid exists, inherently due to more hydroxyl radicals produced synergetically by TiO2/UV and ozone. The initial pH value has little influence on the degradation by combined TiO2/UV and ozone. The removal rate of COD levels off to the range of 90% ～ 95%. After a short time of catalytic degradation of bromamine acid, the decolorization efficiency reaches over 70% and the value of COD is decreased at certain degree. At the same time, the value of BOD5/COD increases from 0.030 ~ 0.043 to 0.320 ~ 0.368, which means that biodegradability of the wastewater is largely raised. All the above factors will benefit the subsequent biological treatment.