摘要
催化臭氧氧化是处理含酚废水的有效手段,为研究α-Fe_(2)O_(3)催化氧化含酚废水的降解效能同时有效回收催化剂,采用微米级α-Fe_(2)O_(3)催化臭氧氧化苯酚模拟废水,并耦合陶瓷膜对分散在反应体系的催化剂进行截留、回收,实现工艺的连续运行。结果表明:在间歇运行条件下,催化氧化反应30 min时废水COD去除率达到97%以上,高COD去除率的主要原因是α-Fe_(2)O_(3)对臭氧具有较强的催化活性,在催化氧化过程中产生了强氧化性产物·OH;在恒压条件下,通过膜污染模型拟合和串联阻力模型进行验证,Rr占总阻力的50%以上,但当操作压力超过30 kPa,一部分可逆污染向不可逆污染逐渐转化,Rir显著增加;通过动力学拟合探究膜污染形成机制,运行过程中陶瓷膜污染模型为中间堵塞或滤饼堵塞,膜污染主要发生在膜表面,膜可以对α-Fe_(2)O_(3)进行有效拦截并通过反冲洗恢复通量;连续进水6个周期运行过程中,模拟废水COD去除率保持在85%以上,陶瓷膜不可逆阻力控制在总阻力的13%以下,反应体系保持了稳定运行。
Catalytic ozonation is an effective method for the treatment of phenolic wastewater.In order to study the degradation efficiency of phenolic wastewater byα-Fe_(2)O_(3)catalytic oxidation and effectively recover the catalyst,micron-sizedα-Fe_(2)O_(3)catalytic ozonation was applied to the simulated phenol wastewater,and the catalyst dispersed in the reaction system was intercepted and recovered by the ceramic membrane to realize the continuous operation of the process.The results showed that:Under the condition of intermittent operation,COD removal rate of wastewater reached more than 97%after catalytic oxidation reaction for 30 min.The main reason for the high COD removal rate was thatα-Fe_(2)O_(3)had strong catalytic activity for ozone and strong oxidizing product·OH was produced during catalytic oxidation.Under the condition of constant pressure,Rraccounted for more than 50%of the total resistance,which was verified by membrane fouling model fitting and series resistance model.However,when the operating pressure exceeded 30 kPa,some reversible fouling gradually transformed into irreversible fouling,and Rir increased significantly.The formation mechanism of membrane fouling was explored by kinetic fitting.The ceramic membrane fouling model during operation was intermediate blockage or filter cake blockage.Membrane fouling mainly occurred on the membrane surface.The membrane could effectively interceptα-Fe_(2)O_(3)and recover the flux through backwashing.During the six-cycle operation of continuous influent,COD removal rate of simulated wastewater remained above 85%,the irreversible resistance of ceramic membrane was controlled below 13%of the total resistance,and the reaction system maintained stable operation.
作者
王勇
张耀宗
毕莹莹
杜明辉
孙晓明
WANG Yong;ZHANG Yaozong;BI Yingying;DU Minghui;SUN Xiaoming(State Environmental Protection Key Laboratory of Ecological Industry,Chinese Research Academy of Environmental Sciences;School of Architecture and Civil Engineering,North China University of Science and Technology)
出处
《环境工程技术学报》
CAS
CSCD
北大核心
2023年第1期232-239,共8页
Journal of Environmental Engineering Technology
基金
国家水体污染控制与治理科技重大专项(2017ZX07402-002),国家环境保护生态工业重点实验室开放基金(2022KFF-15),中央级公益性科研院所基本科研业务费专项(2022YSKY-09)。
