Resourceful treatment of artificial wastewater containing low concentration copper by complexation-ceramic membrane coupling process
Chenmu ZHANG1,2,, Jingyang LIU1, Jingfu DAI3, Xiaoming SUN1,, 1.Key Laboratory of Eco-Industry of the Ministry of Environmental Protection, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 2.China Communications Construction Water Transportation Consultants Co. Ltd., Beijing 100007, China 3.Jilin Petrochemical Branch of PetroChina Co. Ltd., Jilin 132022, China
Abstract:In this study, polyacrylic acid (PAA) and chitosan (CTS) were taken as the complexing agents to couple the ceramic membrane with a pore size of 200 nm for treating a type of wastewater containing low-concentration copper. The treatment effect and membrane fouling were characterized by ICP-MS, TOC, SEM and Darcy membrane fouling model. And the effects of different complexing agents on Cu2+ rejection and recycling were investigated in detail, as well as the membrane fouling mechanism. Results indicated that solution pH played a decisive role in the Cu2+ rejection by affecting the complexing active sites of the polymers. Under the optimum conditions of pH=6, P/M≥5 or C/M=10, the Cu2+ rejection rate could approach 100%. Compared with CTS, PAA presented a higher complexing efficiency for Cu2+, while CTS showed a better anti-interference ability against impurity ions. The recycled PAA/CTS through acid hydrolysis still maintained above 99% Cu2+ rejection. Combined the membrane pollution resistance distribution calculation with SEM and EDX, the cake layer clogging was identified as the primary membrane fouling, and CTS was more likely to cause the irreversible blockage of membrane pores. Key words:ceramic membrane/ wastewater containing copper/ ionic strength/ membrane pollution.
图1实验装置示意图 Figure1.Scheme of the experimental apparatus
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1.Key Laboratory of Eco-Industry of the Ministry of Environmental Protection, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 2.China Communications Construction Water Transportation Consultants Co. Ltd., Beijing 100007, China 3.Jilin Petrochemical Branch of PetroChina Co. Ltd., Jilin 132022, China Received Date: 2018-10-19 Accepted Date: 2019-03-04 Available Online: 2019-09-30 Keywords:ceramic membrane/ wastewater containing copper/ ionic strength/ membrane pollution Abstract:In this study, polyacrylic acid (PAA) and chitosan (CTS) were taken as the complexing agents to couple the ceramic membrane with a pore size of 200 nm for treating a type of wastewater containing low-concentration copper. The treatment effect and membrane fouling were characterized by ICP-MS, TOC, SEM and Darcy membrane fouling model. And the effects of different complexing agents on Cu2+ rejection and recycling were investigated in detail, as well as the membrane fouling mechanism. Results indicated that solution pH played a decisive role in the Cu2+ rejection by affecting the complexing active sites of the polymers. Under the optimum conditions of pH=6, P/M≥5 or C/M=10, the Cu2+ rejection rate could approach 100%. Compared with CTS, PAA presented a higher complexing efficiency for Cu2+, while CTS showed a better anti-interference ability against impurity ions. The recycled PAA/CTS through acid hydrolysis still maintained above 99% Cu2+ rejection. Combined the membrane pollution resistance distribution calculation with SEM and EDX, the cake layer clogging was identified as the primary membrane fouling, and CTS was more likely to cause the irreversible blockage of membrane pores.