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531.
Biological elimination of H2S and NH3 from wastegases by biofilter packed with immobilized heterotrophic bacteria 总被引:10,自引:0,他引:10
Biotreatment of various ratios of H2S and NH3 gas mixtures was studied using the biofilters, packed with co-immobilized cells (Arthrobacter oxydans CH8 for NH3 and Pseudomonas putida CH11 for H2S). Extensive tests to determine removal characteristics, removal efficiency, removal kinetics, and pressure drops of the biofilters were performed. To estimate the largest allowable inlet concentration, a prediction model was also employed. Greater than 95% and 90% removal efficiencies were observed for NH3 and H2S, respectively, irrespective of the ratios of H2S and NH3 gas mixtures. The results showed that H2S removal of the biofilter was significantly affected by high inlet concentrations of H2S and NH3. As high H2S concentration was an inhibitory substrate for the growth of heterotrophic sulfur-oxidizing bacteria, the activity of H2S oxidation was thus inhibited. In the case of high NH3 concentration, the poor H2S removal efficiency might be attributed to the acidification of the biofilter. The phenomenon was caused by acidic metabolite accumulation of NH3. Through kinetic analysis, the presence of NH3 did not hinder the NH3 removal, but a high H2S concentration would result in low removal efficiency. Conversely, H2S of adequate concentrations would favor the removal of incoming NH3. The results also indicated that maximum inlet concentrations (model-estimated) agreed well with the experimental values for space velocities of 50–150 h−1. Hence, the results would be used as the guideline for the design and operation of biofilters. 相似文献
532.
研究了利用电厂粉煤灰作为非均相催化剂,催化H2O2氧化对氨基苯酚(PAP),讨论了各种因素对PAP去除率的影响。结果表明,在30℃,pH=1.5,H2O2和PAP的起始浓度分别为0.50mol/L和0.10mol/L,反应时间为100min,粉煤灰用量为6.0%,搅拌速度为1000r/min的条件下,粉煤灰具有良好的催化活性,能有效地催化H2O2氧化PAP,PAP的去除率可达81%左右。该法可用于预处理含PAP的工业废水。 相似文献
533.
Thermal decomposition kinetic of liquid organic peroxides 总被引:3,自引:0,他引:3
Xin-Rui Li Hiroshi Koseki 《Journal of Loss Prevention in the Process Industries》2005,18(4-6):460-464
This study demonstrates the application of isothermal calorimeter for investigating the thermal decomposition of several liquid organic peroxides, such as t-Butyl peroxy acetate (TBPA), Di-tert butyl peroxide (DTBP), and Cumene hydroperoxide (CHP). The decomposition mechanism and kinetic can be identified from case to case. TBPA and DTBP undergo first order reaction, whereas CHP occurs autocatalysis. Accurate kinetic can be assessed on the basis of discerning these various schemes of given samples. Consequently, the thermal runaway or reactive hazards potential of organic peroxides can be determined, for instance as a self accelerating decomposition temperature (SADT). 相似文献
534.
535.
作者采集了西南极南设得兰群岛纳尔逊岛冰盖的冰雪样,并测得其δD和δO~(18)值分别为-67.8~-75.0‰和-8.72~-8.93‰,进而拟合出δD和δ~(18)O关系大致为δD=8δ~(18)O-1.5。本文从“大陆效应”、“温度效应”、“纬度效应”及降雪过程的同位素动力分馏等方面对所获资料作了讨论。 相似文献
536.
IntroductionRecently,theindustrialtextilewastewaterhasbeenconsideredtobeaseriouspollutionproblemthroughouttheworld.About10000dif?.. 相似文献
537.
介绍了催化柴油加氢精制装置汽提塔顶冷却系统设备腐蚀的原因,并结合装置的实际情况提出了防腐措施。 相似文献
538.
539.
Davide?VioneEmail author Fabrizio?Merlo Valter?Maurino Claudio?Minero 《Environmental Chemistry Letters》2004,2(3):129-133
We show that the degradation of phenol by Fe(III) and hydrogen peroxide is faster in the presence of humic acids. This is most likely due to faster reduction of Fe(III)-humate complexes by H2O2/HO2·/O2–· when compared with Fe(III)-H2O complexes. The fact that humic acids, a major class of naturally occurring compounds, favour the Fenton reaction has great relevance in the field of water and soil decontamination, where organic compounds usually have a negative effect. Furthermore, it adds insight into the self-depuration processes of natural aquifers. 相似文献
540.
硫酸盐还原——甲烷化两相厌氧处理工艺中的回流比研究 总被引:4,自引:0,他引:4
以硫酸盐还原—产甲烷两相厌氧新型工艺处理含高浓度硫酸盐有机废水,气提塔出水的回流比的操作选择十分关键。根据、电离平衡理论及最佳工艺条件要求(液相中的C_L(H_2S)≥208mg/L,c(S~(2-))≤500mg/L)推导出估算回流比的模型为[Bc_0(SO_4~(2-))/1500-1]/η≤R≤[Bc_0(SO_4~(2-))(1.49×10~(pH-7) 1)~(-1)/588-1]/η。以该模型为依据处理SO_4~(2-)浓度为10000mg/L合成废水时,得到总COD去除率和总硫酸盐还原率分别为92.6%和97.6%。 相似文献