共查询到17条相似文献,搜索用时 125 毫秒
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报告了采用膜生物反应器(MBR)-纳滤(NF)组合工艺处理高浓度垃圾渗滤液,该工艺充分发挥了MBR和NF单元的功能互补性,运行实践表明,对COD和氨氮的平均去除率均达99.5 %,出水满足《生活垃圾填埋污染控制标准》的一级标准,运行费用(含折旧)为19.55元/m3,具有较明显的技术经济优势。 相似文献
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垃圾电厂的渗滤液具有COD、BOD浓度高,NH3-N高等特点,传统的生化处理工艺出水水质难以得到保证。膜生物反应器工艺的应用,很好地解决这方面的问题,对污水变化地适应性很强,污染物去除率高,系统启动速度快,逐步成为国内外垃圾渗滤液处理的主流工艺。 相似文献
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以钨湿法冶金中的一种氨淋洗吸附钼钨树脂后淋洗液为料液,采用膜分离技术实现氨的分离.通过比较多种纳滤和反渗透膜对钼钨与氨的分离效果,从中选择了一种合适的低压反渗透膜,考察了膜分离过程中原料液浓度、操作压力、浓缩比、温度因素对透过液通量、钼钨截留率、氨回收率(或透过率)以及钼钨与氨分离系数的影响,在操作压力2.41MPa,温度在36℃,浓缩比为4∶1的条件下,透过液通量达27 L/(m2·h),Mo、WO3的截留率接近100%,Mo、WO3与NH3的分离系数分别达18和51,料液中76%的氨得到回收.以实验室的试验结果为依据,选用低压反渗透膜用于工业生产,取得了良好的效果. 相似文献
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Effect of landfill leachate on cell cycle, micronucleus, and sister chromatid exchange in Triticum aestivum 总被引:1,自引:0,他引:1
With increasing use of municipal solid waste landfills for waste disposal, the leachate generated has become a serious environmental concern. Therefore, it is important to set up simple and accurate methods for monitoring leachate toxicity. In the present study, the physiological and genetic toxicity of the leachate, generated from Xingou Municipal Landfill in China, were investigated with Triticum aestivum (wheat) bioassay. The results indicate that the lower leachate concentrations stimulated the germination, growth and cell division, and did not induce obvious increase in micronucleus (MN) frequency in root tips; while the higher concentrations inhibited the processes, and significantly augmented the MN frequency in a concentration- and time-dependent manner. In addition, pycnotic cells (PNC) and sister chromatid exchange (SCE) occurred in root tips at all leachate concentrations tested, and the frequencies had positive relation with the treatment concentration and time. The results imply that components of leachate from the landfill may be genotoxic in plant cells, and exposure to leachate in the aquatic environment may pose a potential genotoxic risk to organisms. The results also suggest that the wheat bioassay is efficient, simple and reproducible in monitoring genotoxicity of the leachate. 相似文献
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药厂制水工艺技术改造实例 总被引:1,自引:0,他引:1
介绍了清华紫光古汉集团衡阳制药厂采用反渗透 (RO) 混床技术改造原全离子交换 (IE)法制水工艺 .两年时间的运行表明 :新工艺的产水潜力增加 ,产品水质改善 ;年节约酸碱5 2 2t(计 4 1.76万元 ) ,年节约IE树脂 4t(计 7.32万元 ) ,不到一年时间即回收全部技改投入资金 ,且可供应部分饮用纯净水 相似文献
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通过亲核取代反应制备了酚酞型聚醚砜(PES),利用浓硫酸对其磺化后得到了磺化聚醚砜(SPES),并通过核磁光谱对其结构进行了表征.将SPES与一定量的PVA溶解混合后,以聚砜超滤膜为支撑层,采用刷涂法制备了复合反渗透膜(SPES-PVA).扫描电镜照片显示该方法制备的反渗透膜表面平整,而且无缺陷.PVA的加入提高了膜的截盐率以及耐氯性.采用该方法得到的复合反渗透膜具有良好的截盐率和水通量.其中,当PVA的加入量为0.1%时,SPES-PVA-0.1复合反渗透膜对氯化钠的截盐率达到了97.8%,水通量为12.3L/(m2·h). 相似文献