基于环境风险的PFOS废物管理对策研究

PFOS是近来受到较多关注的一种持久性有机污染物(POPs)。斯德哥尔摩公约在我国生效后,我国不仅将面临PFOS的淘汰工作,还要解决历史库存和废物的处置和管理问题。为做好PFOS废物环境管理工作,本文分析了我国PFOS废物的现状,结合公约对于PFOS废物的管理要求,总结了我国开展PFOS废物管理面临的挑战,并提出相应的应对策略。     

我国PFOS的环境风险管理对策研究

PFOS在我国生产量不断增加,使用范围广泛,在整个生命周期中通过生产、销售、使用以及三废处理等过程排放到环境中,导致我国环境介质、野生动物和人体内均可检测到PFOS存在。为履行斯德哥尔摩公约,推动PFOS环境风险管理工作,本文分析了国际上已开展的PFOS风险管理措施,以及我国PFOS风险管理面临的形势和挑战,提出了我国PFOS风险管理的政策建议。     

广州森林大气中VOCs昼夜变化特征及对O_3的影响

挥发性有机物化合物(VOCs)是大气光化学过程的重要前驱物,对大气中的臭氧(O)3有重要影响。文章对广州市花都区王子山森林公园大气中VOCs的昼夜变化特征进行了分析,并且评估了其对大气中O3的相对贡献。共定性和定量了21种VOCs,其中1,2,4-三甲基苯(21.50±32.90)μg/m3、甲基环戊烷(20.40±23.30)μg/m3和异戊二烯(14.90±39.20)μg/m3浓度最高。对于大多数VOCs来说,活性VOCs与相对惰性的VOCs表现出相反的昼夜变化特征,这反映了大气光化学反应对于VOCs的影响。采用Propy-Equiv浓度对大气VOCs对O3的影响评估结果表明,该地区大气VOCs对O3贡献的大小为:烯烃>苯系物>烷烃。     

UiO-66-(COOH)2对水溶液中In(Ⅲ)的吸附性能

以水作溶剂,采用简单的回流法合成了一种稳定的金属有机骨架材料UiO-66-(COOH)2,并首次将其用于In(Ⅲ)离子的吸附分离。采用傅里叶变换红外光谱(FTIR)、热重分析(TGA)、N2吸附-脱附和X射线衍射(XRD)等手段对材料进行了表征。通过静态吸附试验,探讨了pH值、接触时间和溶液初始质量浓度等因素对材料吸附In(Ⅲ)离子性能的影响。结果表明,在pH值为3.0、温度为303 K的条件下,UiO-66-(COOH)2对In(Ⅲ)的最大饱和吸附容量可达84.29 mg/g,优于大多数文献的报道值;整个吸附过程在90 min左右完成,且符合Langmuir等温吸附方程,而吸附动力学可以用准二级动力学模型进行描述。其可能的吸附机理是UiO-66-(COOH)2中的羧基与In(Ⅲ)离子的配位作用。此外,该材料能够实现重复使用,且在Na(Ⅰ)、K(Ⅰ)、Mg(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)和Ni(Ⅱ)等竞争性金属离子的存在下,对In(Ⅲ)仍具备较好的吸附选择性。研究结果为含铟废水的处理提供了一种有效的新途径,也进一步拓展了MOFs材料的实际应用。     

1株咔唑降解菌的分离、鉴定及其降解特性研究

利用微生物分离技术,从土壤中分离到1株咔唑降解菌KH-6.菌株KH-6能够以咔唑为唯一的碳源和能源良好地生长,同时还可以利用3-甲基咔唑、4-羟基咔唑和2,2′-二羟基联苯生长.经过对其形态特征、生理生化、以及16S rDNA序列分析,初步鉴定为黄杆菌属细菌.该菌株对咔唑的降解性是通过在液体培养基内菌体的增加及底物的减少来证实的,其利用咔唑生长的最适温度和pH分别为30℃和7.5.静止细胞反应试验表明,菌株KH-6除了咔唑以外还可降解其它杂环化合物.咔唑污染土壤中的生物降解实验表明,在灭菌土壤中90%的咔唑被降解,菌株KH-6对土壤中的咔唑有很好的生物降解效果.     

锦州湾表层沉积物正构烷烃特征参数研究

研究了锦州湾沉积物中正构烷烃的含量、组成特征、特征比值及其来源.采集18个站位的表层沉积物样品,经正己烷/二氯甲烷（体积比1∶1）混合液索氏提取、净化浓缩后进行GC-MS分析.结果表明,正构烷烃含量（Σn-Alk）范围1.9～4.2μg.g-1,平均值2.6μg.g-1,各个站位组成特征相似,都表现为双峰型,显示了陆源与海源双重贡献特征.ΣC25～31贡献值为20%～32%,短/长链比值L/H均值为0.67,C31/C19均值3.06,类脂物比值TAR均值为2.02,3个参数显示锦州湾沉积物外来源陆源贡献值要大于海洋源,特别是2、3和7站位受到陆源河流输入影响较大.碳优势指数CPI范围1.19～2.63,均值1.73,接近于1;姥鲛烷和植烷比值Pr/Ph为0.91～1.28;样品中普遍存在不可分离化合物UCM,U/R比值为2.2～4.3,此3个参数显示出13和15站位有石油输入特征.多种特征参数比值综合分析表明该海域受到了陆源输入和石油烃污染的威胁,这可能与锦州湾地区河流排污、港口航运有关.     

多金属污染土壤中微生物群落功能对麻疯树-化学联合修复的响应

应用BIOLOG实验技术,结合土壤和植物的相关指标,对广东省大宝山矿山周边多金属污染土壤修复过程中微生物群落代谢方式的变化进行分析,结果表明,施用改良剂可以显著提高土壤微生物群落的活性:粉煤灰＞石灰＞白云石＞对照,其中粉煤灰对提高多金属污染土壤微生物的代谢多样性有显著效果;种植麻疯树后土壤微生物活性也发生变化,结果为:...     

泳池水质与人体健康

游泳是一项健康的体育活动,但同时也增加了与病原微生物和消毒药/副产品暴露接触的风险.鉴于康乐体育游泳运动的普及,值得洋意的是,我们对游泳池化合物、人体暴露和潜在的健康风险的理解仅处于初级阶段而已.归绺其原因部分是由于游泳池水化学的复杂性,当水从源头流向泳客的时候增加了它在水中的转化     

Treatment of taste and odor causing compounds 2-methyl isoborneol and geosmin in drinking water: A critical review

Problems due to the taste and odor in drinking water are common in treatment facilities around the world. Taste and odor are perceived by the public as the primary indicators of the safely and acceptability of drinking water and are mainly caused by the presence of two semi-volatile compounds – 2-methyl isoborneol (MIB) and geosmin. A review of these two taste and odor causing compounds in drinking water is presented. The sources for the formation of these compounds in water are discussed alongwith the health and regulatory implications. The recent developments in the analysis of MIB/geosmin in water which have allowed for rapid measurements in the nanogram per liter concentrations are also discussed. This review focuses on the relevant treatment alternatives, that are described in detail with emphasis on their respective advantages and problems associated with their implementation in a fullscale facility. Conventional treatment processes in water treatment plants, such as coagulation, sedimentation and chlorination have been found to be ine ective for removal of MIB/geosmin. Studies have shown powdered activated carbon, ozonation and biofiltration to be e ective in treatment of these two compounds. Although some of these technologies are more e ective and show more promise than the others, much work remains to be done to optimize these technologies so that they can be retrofitted or installed with minimal impact on the overall operation and e ectiveness of the treatment system.     

Characterization of disinfection byproduct formation potential in 13 source waters in China

The formation potential of four trihalomethanes (THMFP) and seven haloacetic acids (HAA7FP) in 13 source waters taken from four major water basin areas in China was evaluated using the simulated distribution system (SDS) chlorination method. The specific ultraviolet absorbance (SUVA254: the ratio of UV254 to dissolved organic carbon (DOC)), which ranged between 0.9 and 5.0 L/(mg m), showed that the organic compounds in di erent source waters exhibited di erent reactivities with chlorine. The HAA7FP of source waters ranged from 20 to 448 g/L and the THMFP ranged from 29 to 259 g/L. The HAA7FP concentrations were higher than the THMFP concentrations in all but one of the samples. Therefore, the risks of haloacetic acids (HAAs) should be of concern in some source waters. TCM (chloroform) and BDCM (bromodichloromethane) were the major THM constituents, while TCAA (trichloroacetic acid) and DCAA (dichloroacetic acid) were the major HAA species. Br-THM (brominated THM species) were much higher than Br- HAA (brominated HAA species), and the formation of Br-DBP (Br-THM and Br-HAA) should be of concern when the bromide concentration is over 100 g/L.