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71.
Changes in speciation and mobility of As by indigenous bacteria in As-contaminated sediments (339 mg/kg) from an abandoned
Au–Ag mine area in Korea were investigated after biostimulation with a variety of carbon sources, including acetate, lactate
and glucose in batch experiments. Sequential extraction analysis designed to determine the form of As occurrence revealed
that 40 and 47% of As were present in the sediment as Fe-associated and residual fractions, respectively. After 22-day incubation
with acetate and lactate, the presence of indigenous bacteria increased the amount of total dissolved As from both Fe-associated
and residual fractions in the sediment. More than 99% of dissolved As existed as As(V) in biotic slurries in contrast to sterile
controls (less than 50% of total dissolved As), which indicated that indigenous bacteria transformed some dissolved As(III)
to As(V). In real environments, depending on the pH, microbially-produced aqueous As(V) may be either immobilized through
adsorption or reduced to As(III) after migration to the anoxic subsurface. 相似文献
72.
以堆肥-火山灰为填料的生物过滤器连续处理含甲苯、乙酸乙酯和异丙醇的气体,观测生物过滤效果和填料的菌系状态变化.结果表明:在甲苯和乙酸乙酯共存的条件下,生物过滤器优先去除乙酸乙酯;当进气中同时存在甲苯、乙酸乙酯和异丙醇时,优先去除乙酸乙酯和异丙醇.填料中各种微生物的菌体密度与过滤去除的有机物组成和浓度有关.霉菌和酵母菌竞争利用乙酸乙酯和异丙醇的能力较强,放线菌和细菌对甲苯的竞争利用能力较强.进气中高浓度的有机物会使填料中的菌体密度增大.在处理甲苯、乙酸乙酯和异丙醇的生物过滤器的各段填料中,菌体密度按细菌、霉菌、酵母菌、放线菌的顺序而降低. 图 1表 3参 17 相似文献
73.
试验了烧碱法草浆黑液中,钠在厌氧过程中的抑制特性。研究表明,钠盐抑制作用强度为:氯化钠>木素钠>硫酸钠>硅酸钠。相对产甲烷率PM(I)和钠浓度I的关系,可用PM(I)=[1+(I/Ki)^a]^-1拟合,污泥经过驯化,对钠的耐受能力可提高。 相似文献
74.
75.
水相催化芳香氯化物脱氯研究 总被引:4,自引:0,他引:4
通过把起相转移作用的聚乙二醇(PEG)链,键合到硅胶上,再将聚乙烯吡咯烷酮(PVP)络合双金属Pd-Cu后负载其上,制成一种新型双负载双金属催化剂PVP-PdCl2/SiO2-PEG600,以甲酸钠为氢转移试剂,在水相催水芳香氯化物脱氯,当反应温度80℃左右,n(Pd):n(Cu)=2:1,反应介质pH值11.7左右时,具有较高的催化脱卤活性,催化剂不但易于制备,便于分离,且具有良好的重复使用性能,经重复使用六次,转化率仍在70%以上。 相似文献
76.
为强化DBD(介质阻挡放电)技术对VOCs(挥发性有机物)的处理效果,采用溶胶凝胶法制备Bi2WO6/NH(NH为天然赤铁矿)复合催化剂,并利用DBD协同催化剂降解EA(ethyl acetate,乙酸乙酯).采用XRD(X射线衍射)仪、BET(比表面积及孔径)分析仪、SEM(扫描电子显微镜)分析仪对催化剂进行表征,对比分析DBD、DBD/Bi2WO6(DBD协同Bi2WO6)、DBD/NH(DBD协同NH)及DBD/Bi2WO6/NH(DBD协同Bi2WO6/NH复合催化剂)4个体系中EA去除率和能量产率随输入功率、初始ρ(EA)及气体停留时间的变化情况,同时探究输入功率和催化剂对ρ(O3)及矿化率的影响,并对降解产物进行分析.结果表明:①在不同工艺参数条件下,EA去除率和能量产率均表现为DBD/Bi2WO6/NH体系> DBD/NH体系> DBD/Bi2WO6体系> DBD体系.②EA去除率随输入功率的升高和气体停留时间的延长而增加,随初始ρ(EA)的升高而降低;但能量产率随输入功率的升高和气体停留时间的延长而降低,随初始ρ(EA)的升高而增加.③在输入功率为84 W、初始ρ(EA)为0.40 mg/L、气体流量为1.0 m3/h的条件下,相较于DBD体系,DBD/Bi2WO6/NH体系中EA去除率和矿化率分别提高了19.16%和14.44%,而ρ(O3)降低了74.47%.④DBD降解EA的最终产物主要为CO2、H2O及微量的CH4、CH3CH2OH及CH3COOH等小分子有机化合物.研究显示,DBD协同Bi2WO6/NH复合催化剂能够高效去除EA. 相似文献
77.
采用活性炭管吸附废气中的乙酸乙酯和乙酸丁酯,经二硫化碳萃取解析,使用DM-1色谱柱分离后FID检测.实验结果表明:(1)采用活性炭管吸附废气中的目标组份,富集效率良好,二硫化碳解析率可达92%以上;(2)当乙酸乙酯和乙酸丁酯的含量为6.8~102 ng时,测定结果的相对标准偏差分别在1.8% ~4.2%和3.2% ~6.1%之间(n=6);(3)当样品采集量为30 L时,方法检出限分别为0.02 mg·m-3和0.02 mg·m-3.因此,方法能满足实验对空气废气中的乙酸乙酯和乙酸丁酯的检测要求. 相似文献
78.
Ross C. Beier Michael E. Hume Robin C. Anderson Christy E. Oliver Todd R. Callaway Thomas S. Edrington 《Journal of environmental science and health. Part. B》2013,48(6):717-726
Salmonella and Escherichia coli are two bacteria that are important causes of human and animal disease worldwide. Chlorate is converted in the cell to chlorite, which is lethal to these bacteria. An HPLC procedure was developed for the rapid analysis of chlorate (ClO3 ?), nitrate (NO3 ?), and nitrite (NO2 ?) ions in bovine ruminal fluid samples. Standard curves for chlorite, nitrite, nitrate, and chlorate were well defined linear curves with R2 values of 0.99846, 0.99106, 0.99854, and 0.99138, respectively. Concentrations of chlorite could not be accurately determined in bovine ruminal fluid because chlorite reacts with or binds a component(s) or is reduced to chloride in bovine ruminal fluid resulting in low chlorite measurements. A standard curve ranging from 25 to 150 ppm ClO3 ? ion was used to measure chlorate fortified into ruminal fluid. The concentration of chlorate was more rapidly lowered (P < 0.01) under anaerobic compared to aerobic incubation conditions. Chlorate alone or chlorate supplemented with the reductants sodium lactate or glycerol were bactericidal in anaerobic incubations. In anaerobic culture, the addition of sodium formate to chlorate-fortified ruminal fluid appeared to decrease chlorate concentrations; however, formate also appeared to moderate the bactericidal effect of chlorate against E. coli. Addition of the reductants, glycerol or lactate, to chlorate-fortified ruminal fluid did not increase the killing of E. coli at 24 h, but may be useful when the reducing equivalents are limiting as in waste holding reservoirs or composting systems required for intense animal production. 相似文献
79.
Advanced reburning (AR) is effective for nitrogen oxides (NOx) reduction, which integrates the basic reburning (BR) with the injection of nitrogen agents and additive compounds. The basic reburning of poplar, cornstalk, wheat-straw and peanut shell, is studied on a boiler simulator facility (BSF). The influence of operating parameters and the synergistic effect of the injection of ammonia, urea or/and sodium carbonate on NOx reduction are investigated. The results show that an efficiency of 54–67% NOx reduction could be achieved during the basic reburning process under the optimum operating conditions and the efficiency would be increased if nitrogen agent is injected with the over-fire air or into the burnout zone. Further, co-injection of sodium carbonate with the nitrogen agent could make the NOx reduction process more thorough. On the whole, 85–92% NOx reduction could be achieved during the advanced reburning process with a reburning fuel heat input of 15–20%. 相似文献
80.