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膜蒸馏处理制浆造纸反渗透浓水的研究

作者：姚爽，徐先丽，汪朝晖，汪效祖，崔朝亮

单位： 1. 南京工业大学化工学院，材料化学工程国家重点实验室，南京 211816； 2. 南京工业大学国家特种分离膜工程技术研究中心，南京 211816

关键词：膜蒸馏；制浆造纸废水；膜清洗；预处理

DOI号： 10.16159/j.cnki.issn1007-8924.2025.05.016

分类号： TQ330.9

出版年,卷(期):页码： 2025,45(5):162-171

摘要：

本研究采用膜蒸馏（MD）技术处理制浆造纸反渗透（RO）浓缩废水，系统考察了MD操作参数对RO废水处理效能的影响，并采用膜清洗和预处理两种方法很好地缓解了长期真空膜蒸馏（VMD）运行中无机盐结晶与有机物污染导致的膜污染现象。研究表明：提高进料液流速、温度及降低盐浓度可显著提升MD渗透通量。且在一定时间内通过水力清洗可以将运行时间由25 h延长至40 h；采用活性炭对进料液进行吸附预处理，将原液的化学需氧量（COD）由1 000 mg/L降至300 mg/L左右，将膜蒸馏运行时间由24 h延长至36 h，MD通量衰减明显减缓，且渗透液COD稳定低于50 mg/L，满足工业废水排放标准。本研究为膜蒸馏技术处理制浆造纸废水提供了可行方案.

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.

基金项目：

国家自然科学基金（22078146）

作者简介：

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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