摘要
为应对重金属废水日益严格的处理标准和对重金属资源回收的要求,采用新型陶瓷膜短流程工艺处理重金属废水即通过调节p H预处理使重金属离子形成氢氧化物微溶物后,直接进入陶瓷膜过滤,同时辅以曝气减缓膜污染。中试实验在优化p H、膜通量等运行参数后,研究此工艺去除重金属的效果和运行工况,以考察工艺实际应用的可行性。结果表明,p H=9.5时,短流程工艺对重金属的去除效果较好,可在80 L/(m2·h)的膜通量下稳定运行,新型工艺中陶瓷膜的污染主要为可逆污染,可通过水力反冲洗去除。在最佳运行参数条件下,陶瓷膜过滤出水中的Cr3+、Cu2+和Ni2+质量浓度上限值分别低于0.28 mg/L、0.13 mg/L和0.1 mg/L,浊度低于0.5 NTU,跨膜压差保持稳定。此外,膜池中Cr3+、Cu2+和Ni2+的浓缩倍数分别可达92、80和42倍,大大提高了对重金属回收的可能。
A novel short flow ceramic membrane process, aimed at meeting strict standards for heavy metal wastewater treatment and heavy metal muse, was adopted for the treatment of heavy metal wastewater. The process was divided into the following two stages. Firstly, adding alkali in wastewater to turn heavy metal ions into hydroxide precipitate. Secondly, wastewater was filtrated by ceramic membrane within aerating for mitigating membrane fouling. The system performance was studied at the optimum operating parameters including optimizing pH, membrane flux, etc. on the removal efficiency of heavy metals and operating condition to investigate the feasibility of practical application of the process. The results showed that when pH=9.5, the removal efficiency of heavy metals was high, and the process could operate stably at 80 L/（m2·h）. The membrane fouling of the process was reversible, which could be removed by hydraulic flushing. The concentration ofCr3＋,Cu2＋ and Ni2＋ was below 0.28 mg/L, 0.13 mg/L and 0.1 mg/L respectively, when the turbidity of effluent was less than 0.5 NTU, the trans-membrane pressure stayed stably. Furthermore, the concentration multiple of Cr3＋, Cu2＋ and Ni2＋ could reach 92, 80 and 42, respectively, which improved the possibility of recovery of heavy metals.
出处
《水处理技术》
CAS
CSCD
北大核心
2015年第8期92-95,共4页
Technology of Water Treatment
基金
深圳市科技创新项目(CXZZ20120618094712259)
关键词
重金属废水
陶瓷膜
超滤
heavy metal wastewater
ceramic membrane
ultraflltration
