Abstract
The membrane separation process is being widely used in water treatment. It is very important to control membrane fouling in the process of water treatment. This study was conducted to evaluate the efficiency of a pre-oxidation-coagulation flat ceramic membrane filtration process using different oxidant types and dosages in water treatment and membrane fouling control. The results showed that under suitable concentration conditions, the effect on membrane fouling control of a NaClO pre-oxidation combined with a coagulation/ceramic membrane system was better than that of an O3 system. The oxidation process changed the structure of pollutants, reduced the pollution load and enhanced the coagulation process in a pre-oxidation-coagulation system as well. The influence of the oxidant on the filtration system was related to its oxidizability and other characteristics. NaClO and O3 performed more efficiently than KMnO4. NaClO was more conducive to the removal of DOC, and O3 was more conducive to the removal of UV254.
Highlights
Nowadays, water sources all over the world have been, and are being, seriously polluted
The ceramic membrane flux was constant at 120 L/(m2·h) during this experiment
Three different oxidants, including KMnO4, NaClO and O3, were used as pre-oxidants to study the effects of a pre-oxidation process on the specific transmembrane pressure rate of ceramic membrane filtration of the Yangtze River’s raw water
Summary
Water sources all over the world have been, and are being, seriously polluted. Advanced technologies are developed and applied gradually in water treatment plants to effectively remove the pollutants in water sources and meet the strict potable water regulations. Among these technologies, membrane filtration is one of the most promising, owing to its small footprint, reduced use of chemicals, selective separation, high efficiency, low operation cost and stable performance [1,2,3]. Ceramic membranes are increasingly being considered as a cost-competitive and technically superior alternative to organic membranes for drinking water treatment [4,5]. Inorganic membranes possess characteristics of high chemical, thermal and structural stability; inorganic membranes can be superior in resisting corrosive chemicals, microbial deterioration and the surface abrasion caused by coarse particle circulation [6,7]
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