排序方式: 共有12条查询结果,搜索用时 15 毫秒
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CMFC连续微滤装置处理城市污水处理厂出水的应用 总被引:2,自引:0,他引:2
以管式膜连续微滤装置对城市污水处理厂二沉池出水处理回用的可行性进行了应用试验,在试验中分别研究了运行压力和反冲间隔时间与膜通量关系,不同的混凝剂对处理后的出水COD、NH3-N以及浊度的影响。结果表明该装置在运行压力为0.12~0.15MPa,反冲洗间隔为18min的条件下连续运行,吨水能耗仅为0.45kW·h/m3。此时对COD、氨氮和浊度的去除率,分别为75.71%、40.26%和94.49%,处理后出水COD、氨氮、浊度均明显优于《生活杂用水水质标准》中的相关规定。该装置成本低、操作简单,用于污水回用具有较高技术经济可行性。 相似文献
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在塔式生物滤池生产性处理规模上考察了造气含氰废水在挂膜前后的处理效果。比较结果表明,未挂过氰化物的平均处理率仅为79.29%,挂膜后的处理率平均为95.26%,处理后的废水全部回用于生产,减少了氰化物的排放量,防止了造气废水对环境的污染。 相似文献
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通过中试试验考察了高锰酸盐复合药剂(PPC)预氧化强化混凝/沉淀/超滤的组合工艺的除藻效能以及PPC预氧化对藻类引起的膜污染的缓解作用,并对其机理进行了探讨.试验结果表明,投加0.6mg·L-1PPC能使预处理阶段对藻类的平均去除率提高约28%.组合工艺处理高藻水时,PPC预氧化通过强化预处理,降低膜表面的污染负荷,对藻源污染物引起可逆和不可逆污染均具有一定的缓解作用.化学清洗试验结果表明,碱洗对超滤膜TMP恢复效果远远强于酸洗,因而有机物是超滤膜处理高藻水时的主要污染物质. 相似文献
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Qian Xu Xiuhua Zhu Bernhard Henkelmann Karl-Werner Schramm Jiping Chen Yuwen Ni Wei Wang Gerd Pfister Jun Mu Songtao Qin Yan Li 《环境科学学报(英文版)》2013,25(1):133-143
The concentration of polychlorinated biphenyls (PCBs) in the urban air of Dalian, China was monitored from November 2009 to October 2010 with active high-volume sampler and semipermeable membrane device (SPMD) passive sampler. The concentration of PCBs (particle + gas) ( ∑ PCBs) ranged from 18.6 to 91.0 pg/m 3 , with an average of 50.9 pg/m 3 , and the most abundant dioxin-like PCB (DL-PCBs) was PCB118. The WHO-TEQ values of DL-PCBs were 3.6-22.1 fg/m3 , with an average of 8.5 fg/m 3 , and PCB126 was the maximum contributor to ∑ TEQ. There was a much larger amount of PCBs in the gas phase than in the particulate phase. The dominant PCB components were lower and middle molecular weight PCBs. With increasing chlorination level, the concentration of the PCB congeners in the air decreased. The gas-particulate partitioning of PCBs was different for the four seasons. The gas- particulate partitioning coefficients (logK p ) vs. subcooled liquid vapor pressures (logP L 0 ) of PCBs had reasonable correlations for different sampling sites and seasons. The absorption mechanism contributed more to the gas-particulate partitioning process than adsorption. Correlation analysis of meteorological parameters with the concentration of PCBs was conducted using SPSS packages. The ambient temperature and atmospheric pressure were important factors influencing the concentration of PCBs in the air. The distribution pattern of the congeners of PCBs and the dominant contributors to DL-PCBs and TEQ in active samples and SPMDs passive samples were similar. SPMD mainly sequestrated gas phase PCBs. 相似文献
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以钛酸四正丁酯为原料,利用溶胶-凝胶法制备出能光催化降解甲基橙的铝片负载TiO2薄膜.催化活性评价结果表明,在500℃焙烧2小时得到的铝片负载TiO2薄膜具有最好的光催化降解甲基橙活性,同时该薄膜在反应介质中有很好的稳定性.XRD和SEM结果表明,TiO2薄膜由锐钛矿相组成,在焙烧后有均匀的龟裂,裂片大致为4 m×3 m. 相似文献
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中空纤维膜吸收甲苯气体 总被引:1,自引:1,他引:0
采用疏水性聚偏氟乙烯(PDVF)中空纤维膜为气液接触膜,n-甲酰吗啉(NFM)水溶液为吸收剂,研究了膜吸收技术分离甲苯/空气混合气的性能。考察了进气气体浓度、气体停留时间、吸收液体积分数和吸收液流量等诸因素对分离性能的影响。研究结果表明,膜吸收技术可以有效地分离甲苯/空气混合气,甲苯去除率可达90%;提高NFM吸收液的浓度和流量可同时增加甲苯的去除效率η和总传质系数K;气体停留时间的减小导致η降低,K反而增大;进气甲苯浓度的增加导致η下降,同时降低总传质系数K。 相似文献