陶瓷膜处理含镍电镀废水的研究

发布时间：2018-01-07 05:07

  本文关键词：陶瓷膜处理含镍电镀废水的研究　出处：《湖南科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 陶瓷膜 含镍电镀废水 膜污染 膜清洗 堵塞模型 工业化设计

【摘要】：采用陶瓷膜微滤技术处理含镍电镀废水,通过研究微滤过程操作参数影响、浓缩行为、膜污染机理、膜通量恢复及工业化设计等,拓展了陶瓷膜微滤技术在含镍电镀废水中的应用。研究了平均孔径分别为0.8?m和0.5?m陶瓷膜对含镍电镀废水在pH=9时的微滤过程,考察了操作时间、跨膜压差、错流速度、温度和浓缩因子对膜通量和镍截留率的影响,探究了陶瓷膜的清洗行为及该微滤过程的数学模型。结果表明:随操作时间延长,膜通量先迅速下降,然后基本不变;随跨膜压差增大或错流速度增大,膜通量上升至趋于稳定;温度升高使得膜通量增大。0.8?m膜适宜操作参数为跨膜压差0.12 MPa、错流速度3.0 m/s和温度30℃;0.5?m膜适宜操作参数为跨膜压差0.14 MPa、错流速度3.4 m/s和温度30℃.在浓缩过程中,膜通量快速下降至平缓阶段,再较快降低,镍截留率约为99%。反冲能有效提高膜通量,且通量可恢复到初始通量的94%以上;采用质量浓度0.15%盐酸清洗污染陶瓷膜能使其通量恢复到新膜通量的97%左右;该微滤过程符合修正后的完全堵塞数学模型。对陶瓷膜微滤技术处理含镍电镀废水进行了工业化设计,年处理500吨含镍电镀废水,采用膜孔径为0.8?m陶瓷膜,可满足工业要求;设计了两串四并工艺流程,具有良好的经济性。
[Abstract]:The nickel electroplating wastewater was treated by ceramic membrane microfiltration. The effects of operation parameters, concentration behavior, membrane fouling mechanism, membrane flux recovery and industrial design were studied. The application of ceramic membrane microfiltration technology in Ni-containing electroplating wastewater was expanded. M and 0.5? The effects of operation time, transmembrane pressure difference, cross-flow velocity, temperature and concentration factor on membrane flux and nickel retention were investigated. The cleaning behavior of ceramic membrane and the mathematical model of the microfiltration process were studied. With the increase of transmembrane pressure difference or cross-flow velocity, the membrane flux tends to be stable. The increase of temperature increases the flux of membrane. 0.8? The optimum operating parameters of m membrane are as follows: transmembrane pressure difference 0.12 MPa, cross-flow velocity 3.0 m / s and temperature 30 鈩，

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