Relationships of nitrous oxide fluxes with water quality parameters in free water surface constructed wetlands

The effects of chemical oxygen demand (COD) concentration in the influent on nitrous oxide (N₂O) emissions, together with the relationships between N₂O and water quality parameters in free water surface constructed wetlands, were investigated with laboratoryscale systems. N₂O emission and purification performance of wastewater were very strongly dependent on COD concentration in the influent, and the total N₂O emission in the system with middle COD influent concentration was the least. The relationships between N₂O and the chemical and physical water quality variables were studied by using principal component scores in multiple linear regression analysis to predict N₂O flux. The multiple linear regression model against principal components indicated that different water parameters affected N₂O flux with different COD concentrations in the influent, but nitrate nitrogen affected N₂O flux in all systems.     

浅谈循环经济科技支撑体系的建设

循环经济是以科学发展观为统领，以先进的科学技术为基础，以低消耗、低排放、高效率为特征的集约化、内涵式经济增长模式。为了促使我国走上循环经济发展之路，就必须建立循环经济科技支撑体系，即以政府为主导、企业为主体、社会化服务机构健全的循环经济科技创新体系和完善的循环经济科技政策体系、法律法规体系以及绿色文化与教育体系。     

火电厂CO2排放及减排措施

根据全国火电装机情况及规划建设容量，结合火电行业目前CO2排放及控制情况，研究提出了有效控制CO2的减排措施，并对相应措施的CO2减排量进行了预测。     

电力系统抗震可靠性研究与分析综述

地震是最可能造成电力系统遭受严重破坏的自然灾害。对电力系统的震害特点进行了一些研究和介绍,针对这些特点提出了提高电力系统抗震可靠性的措施和建议,并对电力系统抗震可靠性研究现状及发展趋势作了综述。     

Distribution of Redox-sensitive Elements in Bottom Waters,Porewaters and Sediments of Rogoznica Lake (Croatia) in Both Oxic and Anoxic Conditions

Geochemical, mineralogical and sedimentological analyses were carried out to contrast two different sites (respectively characterized by permanently oxic and anoxic conditions) in a small, meromictic, seawater lake. In fact, due to relatively high organic matter content, and reduced water exchange, the Rogoznica Lake has almost permanent anoxic conditions below the depth of 12 m, where sediment can be considered an anoxic–sulphidic sedimentary environment. Different water column and sediments redox conditions affect the distribution and speciation of major redox-sensitive metals (Fe, Mn, Mo), reduced sulphur species (RSS) and dissolved organic C (DOC). Trace metals, especially those that accumulate in anoxic–sulphidic environments (Fe, Mo) showed a marked enrichment in the solid phase, whereas the low solubility of sulphides leads to low porewater concentrations. The relatively high sedimentary enrichment of Mo (up to 81 mg/kg) also confirms highly anoxic conditions within the Rogoznica Lake sediments. Results clearly show that chemical species within the sediments will tend towards equilibrium between porewater and solid phase according the prevailing environment conditions such as redox, pH, salinity, DOC.     

干旱区绿洲土地覆盖变化遥感应用研究--以新疆于田绿洲为例

从人地关系理论出发以土地利用变化为切入点通过野外调查和遥感动态监测对干旱区绿洲土地覆盖变化规律进行了研究.在考察数据和对遥感图像的分类结果的评价的基础上对干旱区绿洲土地利用/土地覆盖空间动态变化进行规律性分析提出只有协调人地关系、加强区域地理建设才是使干旱区绿洲地区避免荒漠化的唯一道路.     

渤海污染现状与治理对策研究

近年来,由于环境污染以及对海洋生物的狂捕滥捞,蓝色海洋面临沦为“死海“和“空海“的危险.实地调查和对实验数据的比较表明:渤海污染呈上升趋势,陆源污染和狂捕滥捞是造成污染的主要原因,其中污染物以无机氮、活性磷酸盐和石油类为主.因此,需要从污染源头和制度上综合治理渤海污染.     

含醇废水和树脂再生废水的循环再利用

以高效生化-高效气浮-过滤-消毒组合工艺蛇理某甲醇厂脱盐反洗再生虞水和含醇废水，整个工程采用自动化控制，无需增加工作人员．工艺处理效果好．出水可作为冷却水回用。     

重庆市基于排放绩效的火电行业二氧化硫总量控制研究

本文介绍了排放绩效及排放绩效方法在火电行业二氧化硫总量控制方面的应用，并对重庆市火电机组及其二氧化硫排放状况进行了全面调查，根据重庆市二氧化硫污染防治的需要制定了各时段机组“十一五”期间的排放绩效控制标准，利用排放绩效方法测算了重庆市火电行业二氧化硫总量控制目标，提出了总量配额分配方法。     

利用缺氧反硝化处理难降解有机物的探讨

本文研究了厌氧、缺氧实验夺件下难降解苯、甲苯、乙苯、二甲苯的同分异构体（BTEX）的生物降解性能。得出了不同底物的厌氧降解变化情况和缺氧降解条件下不同底物适宜的C／N比。通过对实验结果的分析，初步确定了不同底物具有各不相同的C／N比的原因，同时得出了缺氧反硝化与厌氧生物降解过程有可能同时发生的结论。