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481.
在给水曝气生物滤池内置粉末活性炭,对比分析其对各工艺单元水质净化效果的影响,确定给水曝气生物滤池内置粉末活性炭的作用与最佳投加量,研究表明,给水曝气生物滤池将活性炭截留在滤池内,大幅度提高了粉末活性炭利用率,部分未饱和粉末活性炭通过反冲洗排入后续常规处理系统,作为生物载体仍能够进一步发挥生物强化作用。当粉末活性炭的投加量为8 mg/L时,砂滤出水氨氮、CODMn、浊度和色度均值分别为:0.02 mg/L,1.82 mg/L0,.46 NTU和6度,去除率分别达到99.6%、71.2%、99.1%和80.6%,出水指标达到《生活饮用水卫生标准(》GB5749-2006)和《饮用净水水质标准(》CJ94-2005)规定的标准。与常规工艺相比,投加量降低了20%~60%。 相似文献
482.
利用2000—2007年大气污染物排放量数据和同期环境空气质量监测数据,分析了江苏省主要大气污染物减排与环境空气质量变化的相关性。结果表明,近年来江苏省SO2排放量与环境空气中SO2浓度存在正相关,而烟尘和粉尘排放总量与空气中可吸入颗粒物的浓度呈现出弱的负相关关系。对江苏省经济发展和环境关系的进一步分析揭示,江苏省环境库兹涅茨曲线呈现出倒U型关系,表明江苏省已经进入经济环境双赢区间,但近年来政策对经济环境关系的影响突出。该研究对中国十二五环境管理政策的制定有着重要的参考意义。 相似文献
483.
Yuan-yuan Wei Yan Liu Yun Zhang Rui-hua Dai Xiang Liu Jin-jian Wu Qiang Zhang 《Environmental science and pollution research international》2011,18(1):46-50
Introduction
Effluent organic matter from biological wastewater treatment plants is composed of degradation products and soluble microbial products (SMP). Protein, polysaccharide, humic acid, and DNA were major biomolecules of SMP. Little is known about the effects of SMP as microbially derived precursors on disinfection byproduct formation and speciation in biologically treated wastewater. In addition, there has never been any attempt to directly chlorinate the major biomolecules of SMP. 相似文献484.
XM Zheng HL Liu W Shi S Wei JP Giesy HX Yu 《Environmental science and pollution research international》2011,19(7):2498-2505
Perfluorinated compounds (PFCs) have been widely used in industrial and consumer products and frequently detected in many environmental media. Potential reproductive effects of perfluorooctanesulfonate (PFOS), perfluorooctanoic acid (PFOA) and perfluorononanoic acid (PFNA) have been reported in mice, rats and water birds. PFOS and PFOA were also confirmed developing toxicants towards zebrafish embryos; however, the reported effect concentrations were contradictory. Polyfluorinated alkylated phosphate ester surfactants (including FC807) are precursor of PFOS and PFOA; however, there is no published information about the effects of FC807 and PFNA on zebrafish embryos. Therefore, this study was conducted to determine the effects of these four PFCs on zebrafish embryos. Normal fertilized zebrafish embryos were selected to be exposed to several concentrations of PFOA, PFNA, PFOS or FC807 in 24-well cell culture plates. A digital camera was used to image morphological anomalies of embryos with a stereomicroscope. Embryos were observed through matching up to 96-h post-fertilization (hpf) and rates of survival and abnormalities recorded. PFCs caused lethality in a concentration-dependent manner with potential toxicity in the order of PFOS > FC807 > PFNA > PFOA based on 72-h LC(50). Forty-eight-hour post-fertilization pericardial edema and 72- or 96-hpf spine crooked malformation were all observed. PFOA, PFNA, PFOS and FC807 all caused structural abnormalities using early stages of development of zebrafish. The PFCs all retarded the development of zebrafish embryos. The toxicity of the PFCs was related to the length of the PFC chain and functional groups. 相似文献
485.
486.
Shi W Wang X Hu G Hao Y Zhang X Liu H Wei S Wang X Yu H 《Environmental pollution (Barking, Essex : 1987)》2011,159(2):441-448
Thyroid hormone (TH) agonist and antagonist activities of water sources along the Yangtze River in China were surveyed by a green monkey kidney fibroblast (CV-1) cell-based TH reporter gene assay. Instrumental analysis was conducted to identify the responsible thyroid-active compounds. Instrumentally derived l-3,5,3′-triiodothyronine (T3) equivalents (T3-EQs) and thyroid receptor (TR) antagonist activity equivalents referring to dibutyl phthalate (DBP-EQs) were calculated from the concentrations of individual congeners. The reporter gene assay demonstrated that three out of eleven water sources contained TR agonist activity equivalents (TR-EQs), ranging from 286 to 293 ng T3/L. Anti-thyroid hormone activities were found in all water sources with the TR antagonist activity equivalents referring to DBP (Ant-TR-EQs), ranging from 51.5 to 555.3 μg/L. Comparisons of the equivalents from instrumental and biological assays suggested that high concentrations of DBP and di-2-ethylhexyl phthalate (DEHP) were responsible for the observed TR antagonist activities at some locations along the Yangtze River. 相似文献
487.
488.
垃圾焚烧中抑制二恶英二次生成的方法探讨 总被引:1,自引:0,他引:1
根据生活垃圾焚烧技术中二恶英的生成机理,余热锅炉的烟气在低温区急冷可以避免二恶英在低温区的再次合成,但目前在余热锅炉烟气低温区急冷是不可行的。提出一种从垃圾焚烧系统设计上进行烟气的急冷,从而抑制二恶英低温区二次生成的新方法。 相似文献
489.
490.
以钛涂钌电极为阳极、自制蒽醌修饰石墨毡电极为阴极,对头孢合成废水(COD=25 000~30 000 mg/L、ρ(NH3-N)=850~1 300 mg/L、色度为2 300~2 680度)进行了电化学氧化预处理,优化了电解条件,并对电化学体系的动力学和稳定性进行了分析。实验结果表明:蒽醌的存在可改善电化学氧化降解效果;在电解时间50 min、电流密度0.14 A/cm2、Na2SO4浓度0.1 mol/L、极板间距2 cm、初始废水p H 7.0的条件下,废水的COD、色度、NH3-N的去除率分别可达45.3%,66.9%,33.6%;BOD5/COD由处理前的0.27增至0.40,可生化性得到改善;COD、色度、NH3-N的电化学氧化降解过程均近似符合一级动力学方程;且该电化学体系的应用稳定性良好。 相似文献