Study on Advanced Treatment of Secondary Effluent from WWTP by the Ozone-Nanofiltration Hybrid Process
To further decrease the organic matter in the secondary effluent of the wastewater treatment plant(WWTP),improve the effluent quality,and increase the reuse path,an experimental study on the advanced treatment of secondary effluent by ozone-nanofiltration combined process was carried out.The test proved that the process had high efficiency removal rate for fluorescent organic matter and dissolved organic matter in the secondary effluent water,and the maximum removal rate for UV254 and total organic carbon reached 93.1%and 88.1%.In addition,ozone dosing concentration was closely related to membrane pollution.The field emission scanning electron microscopy and specific flux change curve results proved that compared with the blank group without ozone treatment,the membrane pollution of the nanofiltration membrane in the ozone-nanofiltration had been greatly alleviated,and the degree of membrane fouling decreased as the ozone concentration increased.When the ozone mass concentration was 4 mg/L,the membrane pollution control situation reached the optimal level.Due to the advantages of excellent quality of effluent water,no secondary pollution,high treatment efficiency,etc.,the ozone-nanofiltration hybrid process showed a wide range of application prospects in the field of high-efficiency treatment of secondary effluent compared with the traditional water treatment process.
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