摘要
随着国家对工业废水污染物“零排放”要求的提出,高盐工业废水热蒸发成为高盐废水减量化处理的最后工序。其中,作为蒸发工艺中核心设备一一废水加热器,其表面结垢问题成为限制蒸发结晶工艺快速发展的主要障碍。基于环氧树脂涂层具有良好的耐腐、防垢效果,研究使用两步法(刻蚀+浸渍)在金属基材表面制备涂层得到具有良好阻垢效果的疏水金属基材,环氧树脂涂层厚度仅为微米级别,且水接触角可达到(137±1.5)。经过3种盐溶液的测试发现,结垢量下降了50%以上,平均结垢速率稳定在0.02mg/(cm^(2)·h)以下,并且在结垢168h后阻垢效果依旧可保持45%以上。研究制备得到的聚合物铝基具备优良的疏水、阻垢性能,可以有效对抗高盐溶液的结垢侵蚀,是一种具有优良耐垢性能的金属基材。
With the introduction of China's national requirement of"Zero Liquid Discharge",thermal evaporation has emerged as a pivotal technology for minimizing industrial high-salinity wastewater.This process relies on the efficiency and durability of the wastewater heat exchanger,which unfortunately faces significant challenges in surface scaling.The existence of scaling deposits increases the scaling thermal resistance(R,)of the heat exchanger and reduces its operational efficiency.The scaling problem has become the main obstacle to the rapid development of evaporation crystallization process.In this study,based on the characteristics of the modified epoxy resin coating materials with good corrosion resistance and anti-scaling efficiency,a two-step method(etching and dipping)was used to prepare a coating on the metal substrate surface to obtain a hydrophobic metal substrate with superior anti-scaling efficiency.The modified epoxy coating,with a thickness measured in microns,achieved a water contact angle of approximately(137±1.5)°,indicating a high hydrophobicity.Extensive testing in three different saline solutions revealed a substantial reduction in scaling deposits,with all samples exhibiting a decrease rate of over 50%.Notably,the average scaling rate remained consistently below 0.02 mg/(cm^(2)·h),and an obvious scale induction period was observed.After 168 hours of continuous exposure to scaling condition,the coated substrates maintained over 45%of their initial anti-scaling efficiency.The polymer aluminum substrate developed in this study stands out for its exceptional hydrophobic and anti-scaling characteristics.It effectively withstands the corrosive effects of industrial high-salinity wastewater,thereby enhancing the reliability and longevity of the evaporation process.This breakthrough in coating technology not only addresses a critical challenge in thermal evaporation but also paves the way for sustainable and efficient high-salinity wastewater treatment practices in compliance with the"Zero Liquid Discharge"requirement.
作者
姚景
颜子涵
郝成名
王树立
李卓
吴志根
YAO Jing;YAN Zihan;HAO Chengming;WANG Shuli;LI Zhuo;WU Zhigen(Quanzhou Vocational and Technical University,Quanzhou 362000,China;College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)
出处
《环境工程》
2025年第6期138-146,共9页
Environmental Engineering
基金
福建省高校省级科研平台开放课题“工业废水换热器表面防结垢涂层工作机理研究”(QJNY22-03)
国家自然科学金面上项目(52370149)
晋江市科学技术协会2023年委托课题(JJKX23-01)。
关键词
聚合物涂层
环氧树脂
高盐废水
结垢
阻垢
换热器
polymer coating
epoxy resin
high-salinity wastewater
scaling
anti-scaling
heat exchanger
