催化臭氧氧化—生物活性炭吸附组合工艺处理反渗透浓水

采用催化臭氧氧化—生物活性炭吸附组合工艺处理反渗透(RO)浓水,比较了4种催化剂催化臭氧氧化的性能,优化了初始RO浓水pH、臭氧氧化时间、生物活性炭柱空床停留时间(EBRT)等工艺条件。实验结果表明:以WP-01为催化剂催化臭氧氧化RO浓水时无需调节废水pH;臭氧氧化反应5 min时RO浓水的BOD5/COD达0.28,可生化性得到显著改善;WP-01催化剂重复使用30次其催化活性没有明显下降;生物活性炭吸附单元的EBRT控制在30 min左右,可确保出水COD稳定在50 mg/L以下,符合GB 18918—2002《城镇污水处理厂污染物排放标准》的一级A标准;催化臭氧单元处理每吨RO浓水的电费约为1.22元。

Treatment of reverse osmosis concentrated water by combination process of catalytic ozonation-biological activated carbon adsorption

The reverse osmosis （RO）concentrated water was treated by the combination process of catalytic ozonation-biological activated carbon （BAC）adsorption. The catalytic capabilities of 4 catalysts on ozonation were compared. The process conditions were optimized. The experimental results showed that：When WP-01was used as catalyst，the wastewater pH needn’t to adjust；After ozonation for 5 min，the biodegradability of the RO concentrated water was improved significantly with 0.28 of BOD5/COD value；The activity of WP-01 catalyst didn’t obviously decrease after 30 times of reuse；When the empty bed residence time（EBRT）of BAC adsorption unit was controlled at 30 min，the final effluent COD could be stabilized below 50 mg/L，which met the first grade（class A）of national discharge standard GB18918-2002；The electric charge of the catalytic ozonation unit was about RMB 1.22 yuan per ton.