Abstract:

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 BODS/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 biologi-cal treatment.

Key words: bromamine acid, photocatalysis, ozone, biodegradability

摘要：

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。

关键词: 溴胺酸, 光催化, 臭氧, 可生化性

CLC Number: 

• X703.1