共查询到20条相似文献,搜索用时 526 毫秒
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采用中试规模(10m^3/d)的膜——生物膜工艺处理毛纺印染废水,系统对COD、BOD5、色度、浊度的平均去除率分别为85.7%、92.3%、64.3%,和98.9%,出水水质达到《生活杂用水水质标准》(CJ/T48—1999)。长期的运行结果表明,与膜——活性污泥系统相比,膜——生物膜系统的膜通量没有得到明显的提高;膜通量是影响运行能耗的关键因素,在一定的操作压力下,膜通量越低则运行能耗就越高。 相似文献
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纳滤膜去除饮用水中Cr(Ⅵ)的应用研究 总被引:1,自引:0,他引:1
分别采用自制的芳香聚酰胺平板纳滤膜和某芳香聚酰胺平板纳滤膜商品处理模拟含铬饮用水,考察其处理效果及影响因素。结果表明:在Cr(Ⅵ)浓度为50~250μg/L、pH值为7左右、操作压力为0.5 MPa、温度为25℃的条件下,两种纳滤膜对Cr(Ⅵ)的截留效果均较好,出水Cr(Ⅵ)浓度均低于0.05 mg/L(GB 5749—2006的限值),且截留率均随Cr(Ⅵ)浓度的升高而下降,膜通量则基本不变;随着操作压力的增加,两种纳滤膜对Cr(Ⅵ)的截留率均呈上升趋势,膜通量也大幅增加;进水pH值越高,则纳滤膜对Cr(Ⅵ)的截留效果越好,但膜通量无明显变化。 相似文献
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《中国给水排水》2018,(19)
以抗生素制药废水的二级生化出水为研究对象,采用DK纳滤膜对其进行深度处理。优化了操作压力、pH值、进水流量、温度等操作参数,并考察了增加活性炭预处理对产水水质及膜污染的影响。结果表明,操作压力为1 000 kPa、pH值为6. 0、进水流量为8. 0 L/min是纳滤的最佳操作条件,在此操作条件下,采用纳滤膜深度处理经活性炭预处理后的抗生素制药废水的二级生化出水,TOC基本降至零左右,色度降至零,脱盐率达到31. 51%,产水可回用于原厂生产过程。活性炭预处理可提高膜通量,改善产水水质,有效降低膜污染,运行216 h后,膜通量衰减率可由14. 87%降至10. 30%。 相似文献
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与微滤工艺的出水水质相近的动态膜技术,具有投资小、膜污染容易控制、能耗低等优点.以不锈钢丝网为基网、硅藻土为预涂材料制备动态膜,并采用错流操作方式进行过滤.试验结果表明:动态膜错流工艺的预涂时间短、通量大、出水浊度低,且对有机物的去除率可达30%左右.采用恒定压力运行,当动态膜的跨膜压差由0.01 MPa增大到0.02 MPa时,出水通量变大,但运行周期缩短;由0.02 MPa增大到0.03 MPa时,出水通量变小,且运行周期缩短.初始通量越小则跨膜压差的上升速度越慢,运行周期越长.此外,随着预涂混合液浓度的增大,运行周期变长,出水通量变小.对颗粒在膜表面的受力分析表明,跨膜压差和错流速度对动态膜的性能具有重要的影响. 相似文献
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Ultrafiltration of wastewater: effects of particles, mode of operation, and backwash effectiveness 总被引:3,自引:0,他引:3
The effects that wastewater quality and mode of operation have on the performance of an asymmetric, hollow fiber, polysulfone, ultrafiltration (UF) membrane with a molecular weight cutoff of 100,000 Daltons were investigated. Performance was assessed through monitoring membrane flux, transmembrane pressure, effluent biochemical oxygen demand, and operational cost of the experimental system while treating filtered secondary, secondary, and filtered primary effluents. Fluxes achieved for filtered secondary (129-173 l/m2 h), secondary (101-158 l/m2 h), and filtered primary (20-41 l/m2 h) effluents were compared to those obtained at three other locations where similar UF systems were operated. A conceptual model of the impact of an insufficient backwash and of operating the UF system at constant flux on membrane performance is presented to explain the differences in fluxes. Employing pre-membrane granular filtration to remove a portion of the problematic particles in secondary effluent prior to UF led to optimal operational conditions. The costs associated with the operation of pre-membrane granular filtration were offset by the increase in production achieved. Although the use of recirculation could increase maintainable flux when treating a concentrated feed (e.g., filtered primary effluent), the associated costs were high. Improved UF performance was found to result from allowing flux to decline naturally, rather than using a constant flux mode of operation. The effluents produced when filtered secondary and secondary effluents were the feeds would be equivalent to an oxidized, coagulated, clarified, and filtered wastewater as per Title 22 California Wastewater Reclamation Criteria. 相似文献
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针对南楼水厂送水泵站水泵运行工况偏离高效区的问题,通过技术分析和科学论证,采用更换高效率水泵、切削水泵叶轮等方法对泵站实施节能改造。运行结果表明,该送水泵站节能改造投入资金少、风险小,实施后水泵机组效率明显提高,节能效果和经济效益显著。 相似文献
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电液比例负载敏感径向柱塞泵恒流特性的研究 总被引:1,自引:0,他引:1
针对新型高压低器材怕柱塞变量泵的功率分配和控制问题,设计制造了负载敏感元件及控制系统,对这种泵的恒流特性进行了理论分析和试验研究。探讨了工况参数和结构参数对恒流精度、恒流调节范围、流量稳定性以及阶跃响应特性的,并取得了理论分析和试验结果较满意的一致性。 相似文献
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为了探求地下水渗流对地埋管换热器间歇运行性能所产生的影响,基于移动的有限长线热源理论模型解析解,利用MATLAB软件编程计算,分析渗流对单钻孔地埋管换热器的影响。同时对比分析了连续和间歇运行情况下其周围土壤的温度响应特征和过余温度场分布特点。研究表明:埋管周围土壤的温度变化是由热流密度、土壤本身的热物性和实际渗流速度耦合作用影响的,而在间歇运行下其因素影响更加明显。 相似文献
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Understanding the foulant deposition mechanism during crossflow filtration is critical in developing indices to predict fouling propensity of feed water for reverse osmosis (RO). Factors affecting the performance on different fouling indices such as MFI-UF constant pressure, MFI-UF constant flux and newly proposed fouling index, CFS-MFIUF were investigated. Crossflow Sampler-Modified Fouling Index Ultrafiltration (CFS-MFIUF) utilises a typical crossflow unit to simulate the hydrodynamic conditions in the actual RO units followed by a dead-end unit to measure the fouling propensity of foulants. CFS-MFIUF was found sensitive to crossflow velocity. The crossflow velocity in the crossflow sampler unit influences the particle concentration and the particle size distribution in its permeate. CFS-MFIUF was also found sensitive to the permeate flux of both CFS and the dead-end cell. To closely simulate the hydrodynamic conditions of a crossflow RO unit, the flux used for CFS-MFIUF measurement was critical. The best option is to operate both the CFS and dead-end permeate flux at flux which is normally operated at industry RO units (∼20 L/m2 h), but this would prolong the test duration excessively. In this study, the dead-end flux was accelerated by reducing the dead-end membrane area while maintaining the CFS permeate flux at 20 L/m2 h. By doing so, a flux correction factor was investigated and applied to correlate the CFS-MFIUF measured at dead-end flux of 120 L/m2 h to CFS-MFIUF measured at dead-end flux of 20 L/m2 h for RO fouling rate prediction. Using this flux correction factor, the test duration of CFS-MFIUF can be shortened from 15 h to 2 h. 相似文献