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Study on the treatment of reverse osmosis concentrated water of
pulping wastewater by membrane distillation

Authors： YAO Shuang, XU Xianli, WANG Zhaohui, WANG Xiaozu, CUI Chaoliang

Units： 1. College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211816, China； 2. National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 211816, China

KeyWords： membrane distillation; pulping wastewater; membrane cleaning; pretreatment

ClassificationCode：TQ330.9

year,volume(issue):pagination： 2025,45(5):162-171

Abstract：

This paper adopted membrane distillation (MD) technology to treat the reverse osmosis (RO) concentrated wastewater from pulping wastewater. The effects of MD operating parameters on the treatment efficiency of RO wastewater were systematically investigated. Two methods, membrane cleaning and pretreatment, were used to effectively alleviate the membrane fouling caused by inorganic salt crystallization and organic matter pollution during long-term vacuum membrane distillation (VMD) operation. The research showed that increasing the feed flow rate and temperature and reducing the salt concentration could significantly improve the MD permeation flux. Moreover, hydraulic cleaning could extend the operation time from 25 hours to 40 hours within a certain period; using activated carbon for adsorption pretreatment of the feed solution, the chemical oxygen demand (COD) of the raw solution could be reduced from 1 000 mg/L to about 300 mg/L, and the membrane distillation operation time could be extended from 24 hours to 36 hours. The MD flux attenuation was significantly slowed down, and the COD of the permeate was stably below 50 mg/L, meeting the industrial wastewater discharge standards. This study provides a feasible solution for the treatment of pulping wastewater by membrane distillation technology.

Funds：

国家自然科学基金（22078146）

AuthorIntro：

姚爽（2000-），女，山东潍坊人，硕士研究生，主要研究方向为材料与化工

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