Integrated energy view of wastewater treatment: A potential of electrochemical biodegradation

• Energy is needed to accelerate the biological wastewater treatment. • Electrical energy input in traditional technology is indirect and inefficient. • Direct injection of electricity can be a game changer to maximize energy efficiency. • Microbial electrochemical unit for decentralized wastewater treatment is proposed. It has been more than one century since the activated sludge process was invented. Despite its proven stability and reliability, the energy (especially the electrical energy) use in wastewater treatment should evolve to meet the increasingly urgent demand of energy efficiency. This paper discusses how the energy utilized in conventional biological wastewater treatment can be altered by switching the indirect energy input to a direct electricity injection, which is achieved by the electrode integration providing extra thermodynamic driving force to biodegradation. By using electrodes instead of oxygen as terminal electron acceptors, the electrical energy can be utilized more efficiently, and the key of direct use of electrical energy in biodegradation is the development of highly active electroactive biofilm and the increase of electron transfer between microbes and the electrode. Furthermore, the synergy of different microbial electrochemical units has additional benefit in energy and resource recovery, making wastewater treatment more sustainable.     

生物滤塔除臭技术在污水处理厂的应用

生物滤塔除臭技术在污水处理厂中应用广泛。文章通过对实际案例运行情况的分析,研究了几个主要因素变化对除臭效率的影响。在温度为22℃,温度〉95％,pH值为6．6左右且进气流量及浓度稳定的情况下,生物滤塔的除臭效率可达96％以上,平均净化效率达85％以上,净化后的气体达到《恶臭污染物排放标准》二级标准。     

海洋气溶胶对沿海地区降水组成的贡献

以青岛地区为对象，对沿海地区大气气溶海洋因子对降水组成的贡献，进行了研究分析。结果表明，１）夏季受海洋影响要比冬季明显得多；（２）降水中主要的碱性物质，不论是夏季或冬季，９９％来自大陆气溶胶，海洋的影响可忽略；（３）海洋影响的程度和离海边的距离有关，离海愈远，受海洋影响就愈小，离海愈近，受其影响就愈大。     

关于费马大定理

本文通过对费马提出的费马大定理的证明过程的叙述,拟向人们展示数学的一种魅力,这种魅力告诉人们一个命题的偶然发现会吸引很多人为之奋斗,在奋斗的过程中会产生许许多多的令人惊奇的成就。     

城市污水生物脱氮除磷机理研究进展

介绍了生物脱氮、除磷的基本原理，综述了国内上关于城市污水脱氮除磷机理方面的研究现状和进展，并对今后开展这方面的研究提出展望 。     

Landfill leachate treatment methods: A review

Landfilling of municipal waste is still a major issue of the waste management system in Europe. The generated leachate must be appropriately treated before being discharged into the environment. Technologies meant for leachate treatment can be classified as follows (i) biological methods, (ii) chemical and physical methods. Here we review briefly the main processes currently used for the landfill leachates treatments.     

生物降解与吸附作用协同去除卤乙酸生成势

评价了生物强化活性炭(BAC)的生物降解与吸附作用协同对消毒副产物前体物质(DBPFP)的控制效果.控制 BAC 的空床接触时间(EBCT)为 20min 时,BAC 对卤乙酸生成势(HAAFP)的去除率达到 59%,而相同条件下,普通颗粒炭(GAC)对其去除率只有 27%.BAC 工艺中微生物数量和微生物活性均明显高于 GAC 工艺.通过微生物降解作用和活性炭吸附作用的协同,BAC 对 HAAFP 的去除率与 EBCT 具有明显的线性相关性(R²=0.9069).BAC 出水中指标 UV254与 HAAFP 也表现出一定的线性相关性(R²=0.7702).     

论效应空间与有偿减灾投入心理对策

本文提出了减灾效应空间问题,并分析了其在有偿减灾中的作用机制,以及与其有关的减灾投入心理与费用支付合理化问题。进而探讨了宣传、强制、分割、别类、约束、归并等促进有偿减灾良性发展的部分机理。     

膜生物反应器生物降解与膜分离共作用特性研究

膜生物反应器实质是生物降解与膜分离相互影响,共同作用的过程,污泥浓度与通量之间存在一定的相关关系,膜分离对生和性能尤其是细菌活性有着重要的影响,而生物反应器内细菌胞外聚合物,溶解性有机物及微细胶体可能成为形成凝胶层导致通量下降的主要因素。     

四种净水工艺对水源水微量有机物去除的研究

以UV254和CODMn代表饮用水源水中有机物替代指标.对常规处理、生物陶粒预处理、生物滤池、生物活性炭(BAC)、颗粒活性炭(GAC)、纳滤和光催化氧化进行组合,形成不同的处理流程,研究各流程对UV254和CODMn的去除效果.结果表明,各工艺流程都有一定的处理效率,其中以生物滤池和纳滤为主的组合流程处理效果最佳.此流程对UV254的去除率接近100%,CODMn的去除率达到78.6%,大大提高了饮用水的安全性.