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991.
采用两级移动床生物膜反应器(MBBR)预处理高挥发酚含量的石化厂汽提净化水,考察了HRT和DO对废水中挥发酚和COD去除效果的影响。实验结果表明:在两级MBBR总HRT为10 h、MBBR中部废水DO 为1~3 mg/L的条件下, 装置连续运行处理ρ(挥发酚)=110~201 mg/L、COD=644~1 827 mg/L、BOD5/COD=0.15~0.69的废水,两级MBBR处理后出水平均ρ(挥发酚)为17.6 mg/L,挥发酚去除率达87.9%;平均COD为745 mg/L,COD去除率为32.7%;出水BOD5/COD平均为0.68,表明经过两级MBBR处理后,废水的可生化性有所提高,有利于废水的后续生化处理。 相似文献
992.
Species- and tissue-specific accumulation of Dechlorane Plus in three terrestrial passerine bird species from the Pearl River Delta, South China 总被引:1,自引:0,他引:1
Little data is available on the bioaccumulation of Dechlorane Plus (DP) in terrestrial organisms. Three terrestrial passerine bird species, light-vented bulbul, long-tailed shrike, and oriental magpie-robin, were collected from rural and urban sites in the Pearl River Delta to analyze for the presence of DP and its dechlorinated products in muscle and liver tissues. The relationships between trophic level and concentration and isomeric composition of DP in birds were also investigated based on stable nitrogen isotope analysis. DP levels had a wide range from 3.9 to 930 ng g−1 lipid weight (lw) in muscle and from 7.0 to 1300 ng g−1 lw in liver. Anti-Cl11-DP and syn-Cl11-DP, two dechlorinated products of DP, were also detected in bird samples with concentrations ranged between not detected (nd)-41 and nd-7.6 ng g−1 lw, respectively. DP preferentially accumulated in liver rather than in muscle for all three bird species. Birds had significantly higher concentrations of DP in urban sites than in rural sites (mean, 300 vs 73 ng g−1 lw). The fractions of anti-DP (fanti) were higher in birds collected in rural sites than in urban sites. Significant positive correlation between DP levels and δ15N values but significant negative correlation between fanti and δ15N values were found for birds in both urban and rural sites, indicating that trophic level of birds play an important role in determining DP level and isomeric profile. 相似文献
993.
Yajuan Li Jingjing Zhang Xunyu Xiong Kai Luo Jie Guo Minxia Shen Jiajia Wang Zhenghua Song 《Environmental science and pollution research international》2014,21(11):7204-7210
Based on the enhancing effect of chitosan (CS) on luminol-dissolved oxygen chemiluminescence (CL) reaction, a flow injection (FI) luminol–CS CL system was established. It was found that the increase of CL intensity was proportional to the concentrations of CS ranging from 0.7 to 10.0 μmol l?1. In the presence of chlortoluron (CTU), the CL intensity of luminol–CS system could be obviously inhibited and the decrements of CL intensity were linearly proportional to the logarithm of CTU concentrations ranging from 0.01 to 70.0 ng ml?1, giving the limit of detection 3.0 pg ml?1 (3σ). At a flow rate of 2.0 ml min?1, the whole process including sampling and washing could be accomplished within 36 s, offering a sample throughput of 100 h?1. The proposed FI–CL method was successfully applied to the determination of CTU in soil samples with recoveries ranging from 95.0 % to 105.3 % and the relative standard deviations (RSDs) of less than 4.0 %. 相似文献
994.
995.
Hua Jiang Jeong-Nam Kim Yi Luo 《Environmental Communication: A Journal of Nature and Culture》2019,13(5):582-602
This study applied a situational approach to understanding an environmental problem: PM2.5 (its resulted haze and smog air pollution) in China. Based on a national sample of 374 citizens living in China, it tested a situational model of problem solving and extended it by adding citizens’ environmental engagement behaviour as an immediate consequence of their communicative action. Results of a structural equation modelling analysis supported all the causal links in the conceptual model. Moreover, communicative action significantly mediated the relationship between referent criterion and environmental engagement. Problem recognition, constraint recognition, and involvement recognition did not influence environmental engagement directly, but exerted their significant indirect impact via two key mediators in the model: situational motivation in problem solving and communicative action in problem solving. Theoretical and practical implications of the present study were discussed. 相似文献
996.
Weng Shenglin Li Yiping Wei Jin Du Wei Gao Xiaomeng Wang Wencai Wang Jianwei Acharya Kumud Luo Liancong 《Environmental science and pollution research international》2018,25(15):14499-14510
Environmental Science and Pollution Research - The identification of coherent structures is very important in investigating the sediment transport mechanism and controlling the eutrophication in... 相似文献
997.
Wuxing Liu Yongming Luo Ying Teng Zhengao Li Lena Q. Ma 《Environmental geochemistry and health》2010,32(1):23-29
In situ bioremediation of oily sludge-contaminated soil by biostimulation of indigenous microbes through adding manure was
conducted at the Shengli oilfield in northern China. After bioremediation for 360 days, total petroleum hydrocarbon (TPH)
content was reduced by 58.2% in the treated plots compared with only 15.6% in the control plot. Moreover, bioremediation significantly
improved the physicochemical properties of the soil in the treated plot. Soil microbial counts and community-level physiological
profiling were also examined. Manure addition increased TPH degraders and polycyclic aromatic hydrocarbon (PAH) degraders
in the contaminated soil by one to two orders of magnitude. The activity and biodiversity of soil microbial communities also
increased markedly in the treated plot compared with that of the control. Finally, biotoxicity was used to evaluate the soils
and a sharp increase in the EC50 of the soil after bioremediation was observed, indicating that bioremediation had reduced
the toxicity of the soil. 相似文献
998.
999.
针对三峡库区城市污水氮磷浓度较低的特点,结合城市污水处理旁路污泥减量技术研究,探索了利用鸟粪石结晶沉淀法回收城市污水中氮磷的可行性及影响因素。研究结果表明:低氮磷浓度时,鸟粪石结晶回收氮磷的规律与国内外已有的针对高浓度氮磷的研究规律不同,当污泥厌氧减量池中磷酸盐质量浓度为30~60 mg/L(约为1~2mmol/L)时,在pH值为10.0~10.5,c(Mg2+)∶c(NH 4+)∶c(PO34-)为1∶1.6∶1,反应时间为25 min,搅拌强度在200 r/min的条件下,通过鸟粪石沉淀反应磷去除率可达50%~75%,氮的去除率最高可达51%。 相似文献
1000.
Hexavalent chromium [Cr(VI)] bioreduction produces soluble Cr(III)-organic complexes. The Cr(III)-organic complexes are relatively stable once they are formed, and no data about their toxicity were reported. Therefore, this study aims to investigate the bioavailability and toxicity of the soluble Cr(III)-organic complexes. Saccharomyces cerevisiae L-1 wild type yeast strain was chosen as the model organism and Cr(III)-citrate was selected as the representative compound of the Cr(III)-organic complexes. The short-term chronic aquatic toxicity tests of the Cr(III)-citrate was explored by measuring growth inhibition, direct viable cell count, dry biomass, biosorption, and the amount of CO2 production. Cr(III)-citrate exerted a toxicity of 51 mg/L with an EC 50, which was calculated from the percent growth inhibition. These toxicity data would be helpful to define the toxic potential of the organo-chromium-III compounds in the environment. 相似文献