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41.
选取河南某低阶煤热解废水处理典型工艺流程为研究对象,探讨了各单元对芳香化合物的降解特性。通过降解效能对比发现,SBR工艺对酚类(96.13%)和氮杂环类化合物(78.13%)的降解能力最高,故其为芳香化合物降解的核心单元。通过凝胶色谱、紫外-可见光光谱和三维荧光光谱对全流程废水特性的表征,推测出其分子质量在3 kDa左右,荧光峰在Ex/Em=(300~370) nm/(400~450) nm的腐殖酸物质是煤热解废水关键的难生化物质。各单元的统计分析结果表明,废水处理效果不佳的原因在于酸化、气浮、好氧及强氧化单元。在此基础上,根据最新研究结果和成功案例对现有工艺提出了针对性改进方案。以上结果可为类似的废水处理工程提供参考。 相似文献
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43.
Yin Yuanyuan Li Tong Kuang Duyi Lu Yuanan Shen Yan Xu Jun Jiang Songhui Wang Xia 《Environmental science and pollution research international》2019,26(6):5485-5499
Environmental Science and Pollution Research - Nitrosamines (NAms) are potent genotoxic and carcinogenic but widely detected in drinking water. This study aimed to investigate the occurrence of... 相似文献
44.
Luan Guijie Yin Peng Wang Lijun Zhou Maigeng 《Environmental science and pollution research international》2019,26(20):20377-20385
Environmental Science and Pollution Research - Suicide prevention has become a public health issue of great concern. Previous studies proved that ambient temperature had an impact on suicide death,... 相似文献
45.
Occurrence and fate of hormone steroids in the environment 总被引:32,自引:0,他引:32
Hormone steroids are a group of endocrine disruptors, which are excreted by humans and animals. In this paper, we briefly review the current knowledge on the fate of these steroids in the environment. Natural estrogenic steroids estrone (E1), 17beta-estradiol (E2) and estriol (E3) all have a solubility of approximately 13 mg/l, whereas synthetic steroids 17alpha-ethynylestradiol (EE2) and mestranol (MeEE2) have a solubility of 4.8 and 0.3 mg/l, respectively. These steroids have a moderate binding on sediments and are reported to degrade rapidly in soil and water. Estrogenic steroids have been detected in effluents of sewage treatment plants (STPs) in different countries at concentrations ranging up to 70 ng/l for E1, 64 ng/l for E2, 18 ng/l for E3 and 42 ng/l for EE2. E2 concentrations in river waters from Japan, Germany, Italy and the Netherlands ranged up to 27 ng/l. In addition, E2 concentrations ranging from 6 to 66 ng/l have also been measured in mantled karst aquifers in northwest Arkansas. This contamination of ground water has been associated with poultry litter and cattle manure waste applied on the land. Although hormone steroids have been detected at a number of sources worldwide, currently, there is limited data on the environmental behaviour and fate of these hormone steroids in different environmental media. Consequently, the exposure and risk associated with these chemicals are not adequately understood. 相似文献
46.
为了对春剑野生种群生物多样性保护和再引入生态重建提供理论和技术基础,采用典型样地调查法,对川东平行岭谷区野生春剑伴生植物群落特征进行了研究。结果表明:野生春剑主要分布在松科与壳斗科针阔混交林、壳斗科常绿 落叶阔叶混交林和松树林植物群落,伴生植物有40科58属70种,优势种主要是乔木层的马尾松、青冈、巴山松、油松等,灌木层的杜鹃花、马桑、山茶花等,草本层的蕨类和地被层的苔藓。其中,马尾松、杜鹃花、蕨类、苔藓具有较高的重要值,可作为野生春剑栖息地的指示植物。春剑伴生植物种类具有相对的特异性和选择性,与其它群落相比,群落3、群落4和群落6物种多样性指数H′和均匀度指数E都相对较低,松科和壳斗科植物个体数量较多并占有突出地位,春剑种群的生态密度也相对较高。虽然川东平行岭谷区野生春剑的适生生境条件依然存在,但春剑种群数量总体较小,种群的生态密度在11~60株/hm2,人为破坏性的滥采,是其濒危的直接原因。加强野生春剑资源的就地保护和生境保护,突破春剑种子野生环境共生萌发技术瓶颈,积极开展春剑的“再引入”工作,是春剑保育策略的重要方向 相似文献
47.
A highly resolved temporal and spatial air pollutant emission inventory for the Pearl River Delta region, China and its uncertainty assessment 总被引:31,自引:0,他引:31
Junyu Zheng Lijun Zhang Wenwei Che Zhuoyun Zheng Shasha Yin 《Atmospheric environment (Oxford, England : 1994)》2009,43(32):5112-5122
A highly resolved temporal and spatial Pearl River Delta (PRD) regional emission inventory for the year 2006 was developed with the use of best available domestic emission factors and activity data. The inventory covers major emission sources in the region and a bottom–up approach was adopted to compile the inventory for those sources where possible. The results show that the estimates for SO2, NOx, CO, PM10, PM2.5 and VOC emissions in the PRD region for the year 2006 are 711.4 kt, 891.9 kt, 3840.6 kt, 418.4 kt, 204.6 kt, and 1180.1 kt, respectively. About 91.4% of SO2 emissions were from power plant and industrial sources, and 87.2% of NOx emissions were from power plant and mobile sources. The industrial, mobile and power plant sources are major contributors to PM10 and PM2.5 emissions, accounting for 97.7% of the total PM10 and 97.2% of PM2.5 emissions, respectively. Mobile, biogenic and VOC product-related sources are responsible for 90.5% of the total VOC emissions. The emissions are spatially allocated onto grid cells with a resolution of 3 km × 3 km, showing that anthropogenic air pollutant emissions are mainly distributed over PRD central-southern city cluster areas. The preliminary temporal profiles were established for the power plant, industrial and on-road mobile sources. There is relatively low uncertainty in SO2 emission estimates with a range of −16% to +21% from power plant sources, medium to high uncertainty for the NOx emissions, and high uncertainties in the VOC, PM2.5, PM10 and CO emissions. 相似文献
48.
微生物絮凝剂改善城市污水厂浓缩污泥脱水性能的研究 总被引:7,自引:2,他引:5
采用酱油曲霉(Aspergillus sojae)产生的微生物絮凝剂(MBF)作为污泥絮凝脱水剂,对城市污水处理厂浓缩污泥进行调理,确定该絮凝剂对浓缩污泥脱水的处理工艺参数为:微生物絮凝液最佳投加体积为6%~8%(体积比),发挥絮凝作用的最适污泥温度为28~32℃,最适pH为6~7。经微生物絮凝剂调理的污泥在3 000 r/min离心9 min,污泥脱水率高达82.7%,滤饼含水率降低至77.3%,污泥脱水后体积减至原来的1/5左右。 相似文献
49.
强化生物通风修复过程中柴油衰减规律及其影响因素研究 总被引:1,自引:0,他引:1
强化生物通风技术对于修复因地下储油罐泄漏引起的土壤污染具有很大的应用前景。通过室内土柱模拟柴油泄漏污染土壤,从土柱中总石油烃(total petroleum hydrocarbon,TPH)剖面分布随时间的变化及降解模式角度,分析了其自然衰减和强化生物通风过程。结果表明:初始柴油浓度直接影响着各柱在自然衰减和强化生物通风过程中柱内的残余TPH平衡分布曲线的形状和浓度峰值位置;在前期自然衰减过程中(约1个月),当土壤中的柴油浓度为5 000~40 000 mg油/kg土时,整个柱内TPH变化的主要原因是重力扩散迁移的结果;当土壤中的柴油浓度≤5 000 mg油/kg土时,其TPH的变化不仅是重力扩散迁移作用的结果,生物降解作用也存在;通风约2个月后,抽提作用对于保持土柱上部柴油浓度稳定变化的意义较为突出。 相似文献
50.