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681.
应用蒙特卡罗方法对BODs容量计算的不确定性,作出定量估计。结合算例,讨论了主要参数的统计检验,随机变量生成等。给出了以容量——概率曲线估计不确定性的定量结果。 相似文献
682.
超滤法从造纸黑液中提取木质素制备活性炭 总被引:20,自引:1,他引:20
应用超滤技术从造纸黑液中提取木质素制备活性炭是黑液综合治理的一条新途径,且适合于中、小型造纸厂。经超滤处理过的黑液,COD去除率达到60%-65%,BOD5去除率达到80%以上。黑液中木质素提取率达到80%-85%,由木质素制成的活性炭得率高,吸附容量大,其主要技术指标均优于沪Q/HG11-224-87的标准。 相似文献
683.
Yuanyuan Song Lifang Zhao Zenghua Qi Yanhao Zhang Guodong Cao Ruijin Li Lin Zhu Zhu Yang Chuan Dong Zongwei Cai 《环境科学学报(英文版)》2021,33(7):64-70
Simulation of fine particulate matter (PM2.5) exposure is essential for evaluating adverse health effects. In this work, an ambient exposure system that mimicked real atmospheric conditions was installed in Taiyuan, China to study impacts of chronic PM2.5 exposure on adult and aged mice as well as Sirtuin3 knockout (Sirt3 KO) mice and wild-type (WT) mice. The real-ambient exposure system eliminated the possible artificial effects caused from exposure experiments and maintained the physiochemical characteristics of PM2.5. The case studies indicated that aged mice exhibited apparent heart dysfunction involving increased heart rate and decreased blood pressure after 17-week of real-ambient PM2.5 exposure. Meanwhile, 15-week of real-ambient PM2.5 exposure decreased the heart rate and amounts of associated catecholamines to induce heart failure in Sirt3 KO mice. Additionally, the increased pro-inflammatory cytokines and decreased platelet related indices suggested that inflammation occurred. The changes of biomarkers detected by targeted metabolomics confirmed metabolic disorder in WT and Sirt3 KO mice after exposed to real-ambient PM2.5. These results indicated that the real-ambient PM2.5 exposure system could evaluate the risks of certain diseases associated with air pollution and have great potential for supporting the investigations of PM2.5 effects on other types of rodent models. 相似文献
684.
685.
Adsorption of heavy metal ions from aqueous solution by carboxylated cellulose nanocrystals 总被引:2,自引:0,他引:2
Xiaolin Yu Shengrui Tong Maofa Ge Lingyan Wu Junchao Zuo Changyan Cao Weiguo Song 《环境科学学报(英文版)》2013,25(5):933-943
A novel nanoadsorbent for the removal of heavy metal ions is reported.Cotton was first hydrolyzed to obtain cellulose nanocrystals(CNCs).CNCs were then chemically modified with succinic anhydride to obtain SCNCs.The sodic nanoadsorbent(NaSCNCs) was further prepared by treatment of SCNCs with saturated NaHCO 3 aqueous solution.Batch experiments were carried out with SCNCs and NaSCNCs for the removal of Pb 2+ and Cd 2+.The effects of contact time,pH,initial adsorption concentration,coexisting ions and the regeneration performance were investigated.Kinetic studies showed that the adsorption equilibrium time of Pb 2+ and Cd 2+ was reached within 150 min on SCNCs and 5 min on NaSCNCs.The adsorption capacities of Pb 2+ and Cd 2+ on SCNCs and NaSCNCs increased with increasing pH.The adsorption isotherm was well fitted by the Langmuir model.The maximum adsorption capacities of SCNCs and NaSCNCs for Pb 2+ and Cd 2+ were 367.6 mg/g,259.7 mg/g and 465.1 mg/g,344.8 mg/g,respectively.SCNCs and NaSCNCs showed high selectivity and interference resistance from coexisting ions for the adsorption of Pb 2+.NaSCNCs could be efficiently regenerated with a mild saturated NaCl solution with no loss of capacity after two recycles.The adsorption mechanisms of SCNCs and NaSCNCs were discussed. 相似文献
686.
687.
着重介绍了蒙城地震台FBS-3系统标定参数的测定与计算,同时也总结了标定软件使用的步骤和注意事项.对仪器进行日常脉冲标定、特定情况下的正弦波标定可以对仪器系统的工作状态有一个量化的评定,以此来判定仪器性能的变化及其稳定程度.2006年7月份,对FBS-3数字化测震观测系统进行了一次标定,此次标定作为每年一次系统正弦波标定的最终结果.与2005年7月份标定结果对比分析,两次标定结果差别不大,符合规范要求,观测系统性能稳定. 相似文献
688.
689.
新型腐植酸类净水剂的研制 总被引:2,自引:0,他引:2
优选粘结剂制备的新型风化煤粒状净水剂,对印染废水有良好的处理效果,废水处理略为活性炭处理量的70%,而活性炭的价格略为该净水剂的30倍,文中研究了该净水剂的制造工艺,并进一步探讨了吸附机理。 相似文献
690.
Hua Fang Wei Zhou Zhengya Cao Feifan Tang Dandan Wang Kailin Liu Xiangwei Wu Xiao''e Yang Yongge Sun Yunlong Yu 《环境科学学报(英文版)》2012,24(6):1036-1046
Combined pollution of 1,1,1-trichloro-2,2-bis (4-chlorophenyl) ethane (DDT) and cadmium (Cd) in agricultural soils is of great concern because they present serious risk to food security and human health.In order to develop a cost-effective and safe method for the removal of DDTs and Cd in soil,combined remediation of DDTs and Cd in soil by Sphingobacterium sp.D-6 and the hyperaccumulator,Sedum alfredii Hance was investigated.After treatment for 210 days,the degradation half-lives of DDTs in soils treated by strain D-6 decreased by 8.1% to 68.0% compared with those in the controls.The inoculation of strain D-6 into soil decreased the uptake of DDTs by pak choi and S.alfredii.The shoots/roots ratios of S.alfredii for the Cd accumulation ranged from 12.32 to 21.75.The Cd concentration in soil decreased to 65.8%-71.8% for S.alfredii treatment and 14.1%-58.2% for S.alfredii and strain D-6 combined treatment,respectively,compared with that in the control.The population size of the DDTs-degrading strain,Simpson index (1/D) and soil respiratory rate decreased in the early stage of treatment and then gradually increased,ultimately recovering to or exceeding the initial level.The results indicated that synchronous incorporation of strain D-6 and S.alfredii into soil was found to significantly (p 0.05) enhance the degradation of DDTs in soil and the hyperaccumulation of Cd in S.alfredii.It was concluded that strain D-6 and S.alfredii could be used successfully to control DDTs and Cd in contaminated soil. 相似文献