pH对污水污泥中污染物浸出的影响

研究pH对污泥中污染物浸出的影响可以为投海过程中海洋水体酸碱性变化对污泥中污染物浸出的影响及其变化规律提供理论依据。为了得出不同pH值对污泥中污染物浸出的影响,采用CEN/TS 14429：2005浸出实验对上海5个污水处理厂脱水污泥中重金属、溶解性有机碳、溶解性硫化物和主要离子的浸出情况进行了研究,同时分别以超纯水和海水为浸提剂研究在相应pH范围内盐度对上述指标浸出的影响。结果表明,Zn、Cd、Pb和As在酸性和碱性条件下浸出量较高,在中性或接近中性条件下浸出量则最低,且海水中Zn和Cd的浸出量比超纯水中高;Cu在碱性条件下的浸出量明显比酸性条件高;在所研究的pH范围内,5个污泥样品中溶解性有机碳的浸出量均随pH的升高而增高;仅酸挥发性硫含量最高的S5在海水中有较明显的溶解性硫化物浸出;部分污泥样品中的氮在酸性纯水中有较高的浸出量,海水中浸出量较少;而无论海水或纯水中,磷在强酸和强碱条件下均有明显浸出。     

Is bark pH more important than tree species in determining the composition of nitrophytic or acidophytic lichen floras?

To study the pH preference of epiphytic lichens, the bark pH of Fraxinus, Tilia, Quercus and Ulmus trees in an urban environment was measured using a flat surface electrode. The total number of trees was 253. A survey was made of the lichens in a 40 × 40 cm quadrat surrounding the pH measurement point. Our data analysis using multivariate and univariate statistical techniques indicates that the tree species is the most important factor influencing lichen colonisation, and that bark pH alone is of less importance. We hypothesize that the changed pollution climate, with strong decreases in both sulphur dioxide and ammonia concentrations over the past two decades and a concomitant general increase in bark pH, has made epiphytes less sensitive to pH.     

温度、pH对微生物燃料电池产电的影响研究

采用SPSS分析软件,考察了双室微生物燃料电池(MFC)、单室MFC运行过程中,温度、pH与产电性能的相关关系。结果表明,碳纸双室MFC的日均电压与温度、阳极pH均未呈现显著相关关系,而与阴极pH呈极显著相关关系,产电的决定性因素为阴极反应;石墨毡/碳纸双室MFC日均电压与温度未呈现显著相关关系,而与阳极pH、阴极pH均呈极显著相关关系,产电的决定性因素为pH;单室MFC的产电性能受温度的影响较大,而pH对其影响不显著,对于单室MFC的运行调控应主要从温度入手。     

Study of 210Po and 210Pb in the riverine environments of coastal Karnataka

Activity of ²¹⁰Po and ²¹⁰Pb were measured in soil and sediment samples collected from the major rivers Kali, Sharavathi and Netravathi of Coastal Karnataka. The activity of these two radionuclides were determined by radiochemical separation of ²¹⁰Po and counting the activity using a ZnS(Ag) Alpha counter. The activity of ²¹⁰Pb was higher than that of ²¹⁰Po in the riverine environs. The ²¹⁰Po and ²¹⁰Pb content in sediment was found to increase with silt/clay and organic matter contents. However no significant correlation was found between the activity ²¹⁰Po and ²¹⁰Pb with pH in sediments. The activity of ²¹⁰Po and ²¹⁰Pb and influence of physico-chemical parameters on these radionuclides were studied and discussed in this paper.     

投药方式对鸟粪石法脱氮除磷的影响

鸟粪石法脱氮除磷过程中,投药方式对反应产生很大影响.以MgCl2·6H2O和Na2HPO4·12H2O为沉淀剂进行脱氮除磷的实验研究,结果表明,药剂的投加顺序影响不大,加药速度以缓慢加药为宜,pH值调节时机对氮磷的去除率影响很大,pH值调节时机由前调改为后调,氨氮的去除率由70%左右提高至80%～85%,磷的去除率由6...     

600MW机组湿法脱硫系统运行优化研究

燃煤电厂烟气脱硫装置实际运行的稳定性和可靠性并不理想,由于设计、运行维护经验少及设备选型不合理等原因使脱硫系统维护工作量大。浆液pH值、密度等关键工艺参数设计范围较广,不利于系统稳定运行。目前国内缺少从化学反应理论和工艺控制角度对湿法脱硫系统的研究,对脱硫系统运行经济性的研究也较少。鉴于以上脱硫运行现状,开展了旨在优化湿法脱硫工艺控制、提高系统运行的可靠性和经济性的优化研究。     

湿法脱硫P＆D型pH值及密度复合测量技术介绍

阐述了石灰石—石膏湿法脱硫装置pH值及密度测量的重要性,介绍了一种新型pH值及密度复合测量系统及其应用实例,为类似装置提供了借鉴和参考。     

烟气脱硫系统增压风机仿真模型开发及应用

在大型火力发电机组烟气脱硫脱硝系统的仿真过程中,增压风机是风烟系统仿真的核心。根据脱硫增压风机静态性能曲线的特点,采用偏最小二乘法的曲面拟合理论与风机有关定律,实现了回归建模、数据结构简化以及两组变量之间的相关性分析,可将增压风机的性能曲线簇转化为满足应用精度的函数,对风机的压头、导叶角度、风量和全压效率等关键参数进行实时仿真。太仓港环保电厂的工程应用表明：风机压头仿真模型曲线拟合值与实际值比较接近,绝对误差在0.005～0.06 kPa之间,相对误差在0.1%～1.5%之间;全压效率仿真模型曲线拟合值与实际值较风机压头大,绝对误差在0.1%～2.5%之间,相对误差在0.15%～3%之间,基本满足工程应用精度。     

铁系混凝剂处理含聚合物油田污水的研究

本文探讨了含聚合物油田污水的组成、胶体结构,研究了铁系混凝剂处理该污水的条件和酸度对处理过程的影响。     

碳氮比对悬浮填料生物反应器氮去除效果的影响

文章研究了C/N对悬浮填料生物反应器脱氮效果的影响。出水中NH4+-N、NO2--N和NO3--N浓度以及pH值变化均受C/N的影响,实验得到的最佳C/N质量比为12∶1,TN去除率平均在85%。