中空柱状生物膜载体在处理工业废水工程中的应用

本文介绍新开发的一种在污水处理中的高科技产品一高效生物膜载体,通过对其在与其他处理方式各方面择比研究过程中的高找到其特点,推广新科技。     

端烯丙基苯并15-冠-5接枝壳聚糖对金属离子的吸附性能

将３’－端烯丙基苯并１５－冠－５和４’－端烯丙基苯并１５－冠－５接枝到壳糖或交联壳聚糖上,合成了４种新新型的壳聚糖冠醚,并研究了这４种壳聚糖冠醚对Ｐｄ＾２＋、Ｃｕ＾２＋、Ｈｇ＾２＋的静态吸附性能。结果表明,这４种吸附剂对Ｐｄ＾２＋具有良好的吸附性能,并能在Ｃｕ＾２＋和Ｈｇ＾２＋共存的条件下选择吸附Ｐｄ＾２＋。     

长光路FTIR研究OH发生体系中的OH浓度

利用长光路ＦＴＩＲ测定早苯、三本等芳香烃化合物在烟雾箱中光化学反应衰减,确字了ＮＯｘ－Ｈ２Ｏ、Ａｉｒ、ＨＯＮＯ－Ｈ２Ｏ－Ａｉｒ和ＣＨ３ＯＮＯ－ＮＯ－Ａｉｒ３种体系在我灯自夸下的ＯＨ浓度,结果表明三者ＯＨ浓度范围分别为：～１０＾５～１０＾６、～１０＾７、～１０＾７～１０＾８ｍｏｌｅｃｕｌｅｓ．ｃｍ＾－３,并进一步讨论了反应前体物对生成ＯＨ浓度的影响。     

ASSESSMENT OF PREDICTORS FOR STREAM EUTROPHICATION POTENTIAL1

ABSTRACT: Predicting stream eutrophication potential from non-point source nutrient loading across large temporal and spatial scales is a significant problem. In this paper we describe how two physiological indicators of P stress of stream bioflims, alkaline phosphatase activity (APA) and stored (surplus) P relate to two predictors of P loading: annual P loading predicted by the watershed model SIMPLE, and stream concentrations of soluble reactive P (SRP) in eight subbasins in the illinois River basin in Oklahoma. Data for APA, surplus P, nutrients and water chemistry were obtained at watershed outlets once during the cold season and twice during the warm season. There was a negative curvilinear relationship between APA and both predictors. Best fit was achieved by APA vs. annual predicted P loading. Both SRP and P. load are potentially useful to identify subbasins requiring no pollution abatement and to establish a regional target for P-load reduction. Surplus P is not as useful as APA in establishing these thresholds.     

Application of microbubbles in chemistry,wastewater treatment,medicine, cosmetics,and agriculture: a review

Environmental Chemistry Letters - Microbubbles are 10–100-μm bubbles with unique properties that find applications in chemical reactions, water aeration, sewage purification,...     

Enhancement of extracellular Cr(VI) reduction for anammox recovery using hydrazine: performance,pathways, and mechanism

● N₂H₄ addition enhanced and recovered anammox performance under Cr(VI) stress. ● N₂H₄ accelerated electron transfer of Cr(VI) reduction for detoxification. ● N₂H₄ enhanced anammox metabolism for activity recovery from Cr(VI) inhibition. ● Extracellular Cr(VI) reduction to less toxic Cr(III) was the dominant mechanism. The hexavalent chromium (Cr(VI)) would frequently impose inhibition to anaerobic ammonium oxidation (anammox) process, hindering the efficiency of nitrogen removal in wastewater treatment. Hydrazine (N₂H₄), which is an intermediate product of anammox, participates in intracellular metabolism and extracellular Cr(VI) reduction. However, the roles of N₂H₄-induced intracellular metabolism and extracellular reduction in nitrogen removal under Cr(VI) stress remain unclear. The addition of 3.67 mg/L of N₂H₄ increased the anammox activity by 17%. As an intermediate, N₂H₄ enhanced anammox metabolism by increasing the heme c content and electron transfer system activity. As a reductant, N₂H₄ accelerated the reduction of c-Cyts-mediated extracellular Cr(VI) to the less toxic Cr(III). Extracellular Cr(III) accounts for 74% of the total Cr in a Cr(VI)-stressed anammox consortia. These findings highlight that N₂H₄-induced extracellular Cr(VI) reduction is the dominant mechanism for the survival of anammox consortia. We also found that N₂H₄ increased the production of extracellular polymeric substances to sequester excessive Cr(VI) and produced Cr(III). Taken together, the study findings suggest a potential strategy for enhancing nitrogen removal from ammonium-rich wastewater contaminated with Cr(VI).     

TiO2光催化技术处理饮用水微污染及杀灭微生物的研究

光催化处理饮用水微量污染物以及在饮用水消毒和杀菌方面的研究是近年来研究的热点.本文论述了 TiO2光催化处理饮用水中的微量卤代物、腐殖质、微生物代谢产物,以及杀灭细菌、真菌和病毒等微生物的研究进展.探讨了光催化杀灭微生物的作用机制,最后对该研究领域的发展方向提出建议和展望.     

基于SNMP的重大危险源远程监控系统研究

基于SNMP协议的重大危险源远程监控系统由现场监控网络、SNMP管理代理、SNMP管理工作站、重大危险源管理信息库、SNMP通信模块、数据库、以及计算机网络(Internet)组成。详细分析了现场监控系统、重大危险源管理信息库的定义以及远程监控的实现过程。该系统利用现有网络设施,通过标准的网络管理方式对危险源进行监控和管理。     

低温等离子体催化氧化甲烷的实验研究

采用电容耦合等离子体和催化剂协同作用对干空气中的甲烷进行了氧化实验,并和没有放置催化剂时进行了对比,结果表明,放置催化剂后甲烷的分解效率明显提高,反应产物中CO2的选择性增加,副产物NO和NO2的浓度减少,反应所需的能耗降低.甲烷的最终氧化产物为CO、CO2和H2O.     

密相流态化气力输送技术的工业试验研究

对燃煤电厂密相流态化气力输送系统的不同工况进行1:1工业试验研究.在不影响粉煤灰正常输送的前提下,采集系统核心部件仓泵的压力曲线及数据,对其进行分析.研究认为,仓泵的设计压力至少可以降低为0.8 MPa,并对管路系统提出改进方案,为密相流态化气力输送的设计和运行提供参考依据.