硝化菌载体低温处理生活污水中试

为了考察硝化菌包埋载体低温条件下处理城镇生活污水的技术可行性和可靠性并获得工程应用的参数,以A/O工艺中试系统为试验平台,重点研究了硝化菌包埋载体A/O生化系统低温条件下的启动条件和处理效果。结果表明:在低温条件下(13~15℃),接种普通好氧活性污泥,以已活化的硝化菌载体为核心的处理系统活化启动时间约10 d,不超过15 d;包埋硝化菌载体系统在适宜污泥浓度条件(3 000~3 500 mg/L)、投加率12%的情况下处理城镇生活污水,稳定运行阶段和负荷提高阶段(提高至设计负荷1.44倍)可使出水氨氮平均达1mg/L左右,去除率达99%以上,处理效果远远超出同条件下A/O系统。     

PM-support interfacial effect and oxygen mobility in Pt,Pd or Rh-loaded (Ce,Zr,La)O2 catalysts

• Pt/CZL exhibits the optimum catalytic performance for HC and NO_x elimination. • The strong PM-Ce interaction favors the oxygen mobility and DOSC. • Pd/CZL shows higher catalytic activity for CO conversion due to more O_latt species. • Great oxygen mobility at high temperature broadens the dynamic operation window. • The relationship between DOSC and catalytic performance is revealed. The physicochemical properties of Pt-, Pd- and Rh- loaded (Ce,Zr,La)O₂ (shorted for CZL) catalysts before/after aging treatment were systematically characterized by various techniques to illustrate the relationship of the dynamic oxygen storage/release capacity and redox ability with their catalytic performances for HC, NO_x and CO conversions. Pt/CZL catalyst exhibits the optimum catalytic performance for HC and NO_x elimination, which mainly contribute to its excellent redox ability and dynamic oxygen storage/release capacity (DOSC) at lower temperature due to the stronger PM (precious metals)-support interaction. However, the worse stability of Pt-O-Ce species and volatile Pt oxides easily result in the dramatical decline in catalytic activity after aging. Pd/CZL shows higher catalytic activity for CO conversion by reason of more O_latt species as the active oxygen for CO oxidation reaction. Rh/CZL catalyst displays the widest dynamic operation window for NO_x elimination as a result of greater oxygen mobility at high temperature, and the ability to retain more Rh-O-Ce species after calcined at 1100°C effectively restrains sintering of active RhO_x species, improving the thermal stability of Rh/CZL catalyst.     

THE STATE OF LOUISIANA SUPERPORT AUTHORITY ENVIRONMENTAL PROTECTION PLAN – OIL AND OYSTERS1

ABSTRACT: The State of Louisiana created in 1972 the Deep Draft Harbor and Terminal Authority (commonly called Superport Authority) to plan, promote, and develop a deepwater (crude oil) terminal off the coast of Louisiana, and empowered it to establish an Authority development program to promote the economic and social welfare of its citizens. Simultaneously, the Authority was also charged with developing an environmental protection plan to preserve the environmental values of Louisiana's unique coastal marshland while permitting beneficial industrial and economic development. Consequently, in January 1974, an Environmental Protection Plan was promulgated, consisting of a series of regulations, design standards, and operating procedures aimed specifically at protecting the fragile estuarine environment of coastal Louisiana during the construction and ultimate operation of the superport. The paper describes the development of the Superport Authority's Environmental Protection Plan and the current status of the superport project.     

上海市南汇大治河水质CODcr的监测评价

南汇大治河化学需氧量(CODcr)含量的调查结果表明,大治河的CODcr含量逐年上升,水质从Ⅲ级水体下降到Ⅳ级水体,个别断面有恶化到Ⅴ级水源的趋势,通过分析认为CODcr含量的上升与工业废水大量不达标排放以及生活污水的乱排放有关。     

座舱减压时间对应急供氧参数的影响

通过实验和理论计算的方法对座舱爆炸减压过程中压力变化进行了研究 ,推导了座舱减压时间的计算公式 ;并就座舱减压时间的变化对应急供氧参数进行了分析。结果表明 :减压时间与座舱的容积成正比 ,与爆炸孔的有效面积成反比 ;减压时间的不同 ,对爆炸减压峰值有影响 ,而对剩余压力、稳定值影响不大。研究结果为今后进行供氧系统的爆炸减压实验提供了依据     

战斗机飞行员加压供氧面罩高空供氧防护性能评定

详细介绍了战斗机飞行员新型YM9915加压供氧面罩和TK - 11飞行保护头盔配套的高空供氧防护性能生理评价实验结果。分析讨论了新型加压供氧面罩与飞行保护头盔配套的供氧防护性能特点 ,并针对其不足提出改进建议     

常温厌氧流化床处理高浓度有机废水实验研究

本文对常温(25℃±3℃)条件下低密度载体厌氧流化床(AFB)反应器处理高浓度有机废水进行了研究。实验结果表明:采用好氧预挂膜快速排泥法可加快反应器的启动,低密度载体可有效降低反应器运行能耗,有机物去除效果良好。     

竹丝填充床对高有机负荷及低C/N水质的脱氮特性

利用竹丝填料作为生物载体而组建的接触氧化工艺对高浓度难降解水质和低C/N水质的脱氮特性进行了研究.结果表明,当进水COD为804～5100mg/L,BOD为45.0～1100mg/L,BOD/COD为0.01～0.46的情况下,TN去除率为26.6%～96.95%,出水BOD/COD为0.07～0.75;当COD为98～251mg/L,TN为28.0～105.1mg/L,COD/TN为1.6～4.6时,TN去除率为4.94%～48.8%,说明竹丝填料接触氧化工艺在高浓度难降解水质和低C/N比水质条件下具有很好的脱氮效果,但竹子囊腔内的竹汁会使系统脱氮效果波动;对反应器内的主要菌群的分布特征研究发现,在处理高浓度难降解水质过程中,进、出口处细菌浓度相当;而在处理低C/N水质过程中,细菌、硝化细菌主要分布在反应器的进口处,反硝化细菌沿程均匀分布.     

回流比对投料A~2/O工艺脱氮除磷影响的中试研究

试验采用了投料A2/O脱氮除磷工艺在广州市某污水处理厂进行中试,考察了不同混合液回流比及污泥回流比对投料A2/O工艺脱氮除磷的影响。结果表明,混合液回流比对COD、TP和NH3-N影响较小,对TN的去除率影响较大,系统混合液回流比为200%时,系统处理效果最佳;污泥回流比对系统整体功能的影响较大,随污泥回流比的增大,各指标的去去除率随之增大,结合处理效果和能耗情况,污泥回流比为75%时系统效果最佳。     

曝气生物流化床反应器技术研究

介绍了曝气生物流化床反应器（ABFT）的机理、结构、核心技术及应用。