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This study explored the removal of five veterinary pharmaceuticals (VPs) (sulfamethoxazole (SMETOX), trimethoprim (TMP),
ciprofloxacin (CIPRO), dexamethasone (DEXA) and febantel (FEBA)) from different water matrices (Milli-Q water, model water, tap
water and real pharmaceutical wastewater using four types of nanofiltration (NF) membranes (NF90, NF270, NF and HL) and two
reverse osmosis (RO) membranes (LFC-1 and XLE). All VPs were added to different water matrices at a concentration of 10 mg/L.
Rejections of VPs and water flux were measured. The rejection increased with increase of molecular weight. The highest rejections
were obtained with RO membranes (LFC-1, XLE) and tight NF (NF90) membrane. In general, the rejection of VPs was higher in
model water and tap water than in Milli-Q water, but the water flux was lower. This was mainly explained by ion adsorption inside the
membranes pores. Narrower pore size counteracted the effect of presence of low concentration of natural organic matter (NOM) in tap
water. The NOM was assumed to enhance the adsorption of VPs onto membrane surface, increased the size exclusion and electrostatic
repulsion also appeared during the transport. Investigated water matrices had influence on water flux decline due to their complexity. 相似文献
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电镀废水膜法回用后浓水达标处理研究 总被引:2,自引:0,他引:2
本文对电镀废水经物化预处理--反渗透回收处理后的膜浓废水作为对象,将微电解--芬顿破反应处理方法作为破络合反应,对重金属、COD的去除方法进行了研究,确定了pH4,双氧水加药量3‰,反应时间60 min,是比较好的破络合反应条件;经破络处理后的废水中,进行pH调节后,投加硫化钠浓度50 mg/L,重金属捕捉剂10 mg/L可以将反渗透膜浓水中较低浓度的重金属及COD处理至国家排放标准。 相似文献
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耐高温反渗透膜在化工废水处理中的应用 总被引:1,自引:0,他引:1
以某化工工艺废水的超滤出水为原水,采用耐高温反渗透膜进行处理,考察了操作压力、废水pH、膜面流速及废水总铁质量浓度对耐高温反渗透膜产水通量及脱盐率(以电导率减小率计,下同)和TOC去除率的影响。实验结果表明,在操作压力为0.24 MPa、废水pH为7.60、膜面流速为2.0 m/s的最佳条件下运行4 200 min后,产水通量衰减约73%,反渗透系统的脱盐率为95%~97%,TOC去除率为83%~95%,出水电导率在50μs/cm左右,出水TOC为21~23 mg/L。 相似文献
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高峰 《辽宁城乡环境科技》2014,(12)
正水是生命之源,一切生命活动都离不开水。从经济角度看,水是一种有限而又不可替代的宝贵自然资源,它是农业的命脉、工业的载体、人类文明的摇篮,与人们的日常生活及经济社会发展前景息息相关。人们从来没有像现在这样从战略高度重视水资源,除了水本身的重要性之外,更主要的是由于淡水相对缺乏越来越严重。水资源是有限的,全球总贮量约为13.9亿立方千米,但其中淡水仅有0.36亿立方千米,而且99%蕴藏在南北极的冰 相似文献
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对己内酰胺生产过程废水的回用处理工艺进行了研究。以某己内酰胺化工厂的LUCAS出水作为研究对象,采用膜生物反应器和反渗透膜处理工艺,研究此系统对己内酰胺废水的处理效果。试验结果表明,膜生物反应器工艺适用于该化工厂的生产废水,出水COD平均值为31.33mg/L,平均浊度为0.2NTU,氨氮平均值为2.81mg/L,可以满足反渗透膜的进水要求。在浓缩倍数为3时,反渗透膜系统运行稳定,且产水可以满足化工部循环冷却水用再生水水质标准。 相似文献