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141.
T. N. Angelidis E. Tourasanidis E. Marinou G. A. Stalidis 《Resources, Conservation and Recycling》1995,13(3-4)
The petroleum refining industry makes extensive use of catalysts, containing critical metals, such as, Mo, Co and Ni, for the desulphurization of various oil fractions. The selective recovery of these metals from two uncrushed and at low temperature calcined industrial hydrodesulphurization (Mo---Co/Al2O3 and Mo---Ni/Al2O3---SiO2) catalysts was studied, applying a two-step alkali-acid procedure. Fundamental kinetic aspects of the process, such as, reaction time, leaching reagents concentration and reaction temperature, were studied. Recoveries up to 97% for Mo and up to 92% for Co or Ni in separate solutions were achieved, using low cost and easily available reagents, such as sodium hydroxide and sulphuric acid. 相似文献
142.
Björklöf K Salminen J Sainio P Jørgensen K 《Environmental geochemistry and health》2008,30(2):101-107
Evidence for on site biodegradation may be difficult to provide at heterogeneous sites without additional experiments in controlled
laboratory conditions. In this study, microbial activities measured as CO2 and CH4 production were compared in situ, in intact soil cores and in bottle microcosms containing sieved soils. In addition, biodegradation
rates were determined by measuring the decrease in petroleum hydrocarbon concentrations at 7°C in aerobic and anaerobic conditions.
Elevated concentrations of CO2 and CH4 in the soil gas phase indicated that both the aerobic and anaerobic microbial activity potentials were high at the contaminated
site. Aerobic and anaerobic microbial degradation rates in laboratory experiments of petroleum hydrocarbons were highest in
soils from the most contaminated point and degradation in the aerobic and anaerobic microcosms was linear throughout the incubation,
indicating mass-transfer-dependent degradation. Different results for microbial activity measurements were obtained in laboratory
studies depending on pretreatment and size of the sample, even when the environmental conditions were mimicked. These differences
may be related to differences in the gas exchange rates as well as in changes in the bioavailability of the contaminant in
different analyses. When predicting by modeling the behavior of an aged contaminant it is relevant to adapt the models in
use to correspond to conditions relevant at the contaminated sites. The variables used in the models should be based on data
from the site and on experiments performed using the original aged contaminant without any additions. 相似文献
143.
梁华 《中国安全科学学报》1995,(Z2)
通过对数十个液化石油气新罐场的设计审核和在用罐场调研分析,深入比较常用几种贮罐液面计之优劣与使用特点,介绍了适用于小型贮配站改造用简易价廉的钢瓶倒残系统,提出采用地下掩埋式贮罐设计方案,争取实现贮罐使用安全性和投资回报的优化组合。 相似文献
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147.
石油烃类污染物在地下水中自然衰减特性 总被引:14,自引:0,他引:14
污染物在地下水中的自然衰减是目前解决地下水污染问题的一个重要的研究领域,是地下水污染生物修复的基础课题,本文以地下水中的常见污染物石油烃为对象,着重阐述该物在地下水中的自然衰减特性。根据所获取的国内外资料,介绍了其自然衰减的三种动力学方程:Monod动力学方程,一级衰减动力学方程和瞬时反应动力学方程,并且对于石油烃的自然衰减速率进行了详细的描述,为以后的研究提供参考。 相似文献
148.
Petroleum mass removal from low permeability sediment using air sparging/soil vapor extraction: impact of continuous or pulsed operation 总被引:2,自引:0,他引:2
Air sparging and soil vapor extraction (AS/SVE) are innovative remediation techniques that utilize volatilization and microbial degradation to remediate petroleum spills from soils and groundwater. This in situ study investigated the use of AS/SVE to remediate a gasoline spill from a leaking underground storage tank (UST) in the low permeability, clayey soil of the Appalachian Piedmont. The objectives of this study were to evaluate AS/SVE in low permeability soils by quantifying petroleum mass removal rates, monitoring vadose zone contaminant levels, and comparing the mass extraction rates of continuous AS/SVE to 8 and 24 h pulsed operation. The objectives were met by collecting AS/SVE exhaust gas samples and vadose zone air from multi-depth soil vapor probes. Samples were analyzed for O2, CO2, BTEX (benzene, toluene, ethylbenzene, xylene), and total combustible hydrocarbon (TCH) concentrations using portable hand meters and gas chromatography. Continuous AS/SVE was effective in removing 608 kg of petroleum hydrocarbons from low permeability soil in 44 days (14.3 kg day−1). Mass removal rates ranged from 2.6 times higher to 5.1 times lower than other AS/SVE studies performed in sandy sediments. BTEX levels in the vadose zone were reduced from about 5 ppm to 1 ppm. Ten pulsed AS/SVE tests removed 78 kg in 23 days and the mean mass removal rate (17.6 kg day−1) was significantly higher than the last 15 days of continuous extraction. Pulsed operation may be preferable to continuous operation because of increased mass removal and decreased energy consumption. 相似文献
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废水中石油类总量控制监测的采样技术 总被引:1,自引:0,他引:1
污染物总量控制监测的关键是废水采样的时间和空间代表性问题。采用废水连续自动等比例采样器实现时间代表性,用优化点位解决空间代表性,结果表明以石油类为主要污染物的采样断面应选择在水跃区。 相似文献