Characterization of effluent water qualities from satellite membrane bioreactor facilities

Membrane bioreactors (MBRs) are often a preferred treatment technology for satellite water recycling facilities since they produce consistent effluent water quality with a small footprint and require little or no supervision. While the water quality produced from centralized MBRs has been widely reported, there is no study in the literature addressing the effluent quality from a broad range of satellite facilities. Thus, a study was conducted to characterize effluent water qualities produced by satellite MBRs with respect to organic, inorganic, physical and microbial parameters. Results from sampling 38 satellite MBR facilities across the U.S. demonstrated that 90% of these facilities produced nitrified (NH₄-N <0.4 mg/L-N) effluents that have low organic carbon (TOC <8.1 mg/L), turbidities of <0.7 NTU, total coliform bacterial concentrations <100 CFU/100 mL and indigenous MS-2 bacteriophage concentrations <21 PFU/100 mL. Multiple sampling events from selected satellite facilities demonstrated process capability to consistently produce effluent with low concentrations of ammonia, TOC and turbidity. UV-254 transmittance values varied substantially during multiple sampling events indicating a need for attention in designing downstream UV disinfection systems. Although enteroviruses, rotaviruses and hepatitis A viruses (HAV) were absent in all samples, adenoviruses were detected in effluents of all nine MBR facilities sampled. The presence of Giardia cysts in filtrate samples of two of nine MBR facilities sampled demonstrated the need for an appropriate disinfection process at these facilities.     

金港地下污水处理厂工程建设及设计特点

金港污水处理厂采用A2/O+MBR工艺处理金港镇污水,出水水质达到了《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。该污水处理厂是一座规模较大的全地下式污水处理厂,工艺先进、构筑物及设备选型合理、自动化程度高。     

MBR/DTRO工艺用于中老龄垃圾填埋场渗滤液处理

介绍了南通市垃圾填埋场渗滤液提标改造工程的设计及试运行情况,总结了MBR/DTRO工艺处理中老龄垃圾填埋场渗滤液的工程设计经验,并分析了蒸发工艺处理浓缩液的利弊。结果表明,MBR/DTRO系统处理中老龄填埋场渗滤液能保证出水水质稳定且优于《生活垃圾填埋场污染控制标准》(GB 16889—2008)表3标准,对水质水量的抗冲击负荷能力较强。采用DTRO膜处理MBR出水和蒸发工艺处理浓缩液使最终清液产率达到95.4%,但该法运行成本较高,经济不发达地区不宜采用。     

MBR微滤膜在污水处理厂的清洗维护实践

针对MBR工艺常出现的膜污染问题,在实际运行过程中通过不断摸索、分析总结,探讨了MBR工艺微滤膜清洗维护的有效方法,为MBR工艺的进一步应用、发展提供参考.     

UASB-外置式MBR-NF组合工艺处理垃圾渗滤液工程实例

采用UASB-外置式MBR-NF组合工艺对生活垃圾渗滤液进行处理,处理规模为50 m~3/d。介绍了该工程的设计和运行情况,运行结果表明,该工艺耐冲击负荷,生物降解效率高,出水稳定,处理效果良好,出水水质满足GB 16889—2008《生活垃圾填埋场污染控制标准》一般污染物排放要求。     

MBR工艺在石化污水处理中的应用

随着国家对石化企业节水减排、污水回用的要求不断提高,MBR工艺在石化污水处理中的研究和工程应用越来越广泛。介绍了MBR工艺在已建石化污水处理装置提标改造和新建污水处理装置中的应用现状,对在应用中存在的问题进行了归纳梳理,提出了改进措施与建议,并结合MBR技术改进和材质升级,进一步展望了MBR技术在石化污水回用方面的发展趋势。     

MBR处理制药废水中动力学参数测定

根据膜生物反应器的特点,利用Lawrence-McCarty模式建立了膜生物反应器处理废水时的污泥增殖动力学模型和底物降解动力学模型,并根据MBR处理诺氟沙星制药废水的试验运行数据计算出了动力学常数Y、Kd、Vmax、和Ks,分别为0.31、0.01、0.32、270.22。     

Atom transfer radical polymerization (ATRP): A versatile and forceful tool for functional membranes

The progress in atom transfer radical polymerization (ATRP) provides an effective means for the design and preparation of functional membranes. Polymeric membranes with different macromolecular architectures applied in fuel cells, including block and graft copolymers are conveniently prepared via ATRP. Moreover, ATRP has also been widely used to introduce functionality onto the membrane surface to enhance its use in specific applications, such as antifouling, stimuli-responsive, adsorption function and pervaporation. In this review, the recent design and synthesis of advanced functional membranes via the ATRP technique are discussed in detail and their especial advantages are highlighted by selected examples extract the principles for preparation or modification of membranes using the ATRP methodology.     

污泥浓度对MBR净化效果影响试验研究

在不排泥条件下,膜生物反应器(MBR)内的污泥浓度MLSS和MLVSS都随时间不断累积,而反映污泥活性的MLVSS/MLSS则不断减少。研究中发现,MLSS对MBR运行效果影响显著:TN的去除率随污泥浓度增加而增加,而COD的去除率随MLSS的增加先降后升,TP的去除率则先升后降,且二者均在污泥浓度6500 mg/L时达到极值,NH3-N的去除效果则随着污泥负荷的增加呈降低趋势。     

印制电路板废水处理工程实例

文章介绍了"分流预处理+MBR+Fenton"工艺在印制电路板废水处理上的应用,该工艺自2013年10月投产至今处理效果稳定。出水各项指标均达到相关标准。