A pilot study on the dual membrane process of ultrafiltration and nanofiltration

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A pilot study on the dual membrane process of ultrafiltration and nanofiltration

A pilot study on the dual membrane process of ultrafiltration and nanofiltration to treat algae-laden raw water compared to O3-BAC

Xingqi Dinga, Zhenxun Yua,*, Huaqiang Chub, Dong Wangc, Kunqiao Liud, Buyun Wanga, Caihuan Tonge and Bingzhi Dongb a School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China b State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China c Ningbo Tianhe Aquatic Ecosystems Engineering Co. Ltd, Ningbo 315012, China d CCDI (Suzhou) Exploration & Design Consultant Co. Ltd, Suzhou 215127, China e Centre Testing International (Ningbo) Co. Ltd, Ningbo 315048, China *Corresponding author. E-mail: yuzhenxun@nbu.edu.cn

ABSTRACT In this study, a dual membrane process that combines seven-hole ultrafiltration and nanofiltration was designed and compared to O3-biological activated carbon (O3-BAC) for high-quality drinking water production. The pollutant removal, membrane fouling, long-term operational characteristics, and technical economy were systematically investigated using raw water from Tai Lake, which has a high algae content.

The results elucidate that the dual membrane process has superb decontamination. This method has much better removal of turbidity, CODMn, UV254, and algae than O3-BAC. Its removal of ammonia nitrogen and fluorescent substances is slightly lower than that of O3-BAC, but the effluent still satisfies the drinking water standard. The dual membrane process is also much more capable of dealing with high algae-laden raw water. Compared to O3-BAC, the cost of the dual membrane process is 46.4% higher per ton without consuming chemicals, so it is more environmentally friendly.

In summary, the dual membrane process offers a promising and effective technology to treat high algae-laden water with the advantages of high stability, reliable effluent, and zero emissions.

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