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251.
在处于衰减停滞期的氯代烃污染场地,进行了液相纳米零价铁(nZVI)的现场制备,并针对目标含水层完成了nZVI的2次原位注入.监测结果表明,nZVI的原位注入可有效削减高浓度的氯乙烯(VC)且减缓其向下游的迁移.在第2次注入nZVI后期,在距注入井lm的上游和下游监测井中,氯代乙烯整体呈现降低的趋势;而上游监测井中的氯代乙烷则发生显著反弹;在距注入井2m的下游监测井中,各氯代烃均发生持续降解.总铁浓度变化结果表明,原位注入过程促使部分nZVI短期内向上游发生了定向迁移,导致注入初期上游监测井中氯代烃的削减程度高于下游监测井.乙烯浓度的大幅升高(由1490μg·L-1增加至4110μg·L-1)印证了距注入井2 m的下游监测井中脱氯反应最为显著且彻底,可推测下游适量nZVI的引入有效刺激了含水层优势微生物的协同降解.nZVI原位注入可作为以VC污染为主的衰减停滞期地下水修复的有效手段.以上研究结果可为实际场地大规模治理修复提供参考. 相似文献
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253.
Feng Wang Yankun Zhao Ou Yang Jingbo Cai Mei Deng 《Journal of Loss Prevention in the Process Industries》2013,26(6):1399-1406
HAZOP analysis is a process hazard analysis method that has been widely applied both within and outside the chemical processing industries. This paper presents a design method for a process safety data management program for petrochemical plants based on HAZOP analysis and demonstrates the steps of application involved in building a process safety data management system for an ethylene oxide/ethylene glycol production plant. Firstly, the production data files and relevant documents of the plants should be classified and stored in the program database as reference documents and treatment schemes for coping with abnormal situations should be collected and summarized as guidance documents. Secondly, the HAZOP analysis method is employed to identify all the dangerous deviations possibly existing in the production process of the ethylene oxide/ethylene glycol plant. Then, the relationships among the deviations, the reference documents and the guidance documents should be considered and evaluated. Finally, each dangerous deviation will be given a corresponding reference document and guidance document. The reference documents and guidance documents stored in the expert system can be utilized to help operators solve the corresponding technical problems and cope with abnormal situations. The process safety data management program will contribute to the identification, analysis and resolution of operation problems. When an abnormal situation occurs, according to the deviations exhibited in the system, the necessary reference documents and guidance documents will be quickly consulted by the operators, and an appropriate decision will be made to address the abnormal situation. Therefore, by using the process safety data management program, plant security and human safety in the petrochemical industries will be improved. 相似文献
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255.
The equivalence between multilayered barriers regarding di usion and adsorption was studied. The bottom boundary of the liner
system is defined by assuming concentration continuous and flux continuous conditions of the contaminant between the bottom liner
layer and the underlying soil. Five di erent liner systems were compared in terms of solute breakthrough time. The results of the
analysis showed that breakthrough time of the hydrophobic organic compounds for a 2-meter-thick compacted clay liner (CCL) could
be 3–4 orders of magnitude is greater than the breakthrough time for a geosynthetic clay liner (GCL) composite liner. The GM/GCL and
GM/CCL composite liner systems provide a better di usion barrier for the hydrophilic organic compounds than that for the hydrophobic
compounds due to their di erent Henry’s coe cient. The calculated breakthrough times of the organic contaminants for the Chinese
standard liner systems were found to be generally greater than those for the GCL alternatives, for the specific conditions examined.
If the distribution coe cient increases to 2.8 for the hydrophobic compounds or 1.0 for the hydrophilic compounds, the thickness of
the attenuation layer needed to achieve the same breakthrough time as the standard liner systems can be reduced by a factor of about
1.9–2.4. As far as di usive and adsorption contaminant transport are concerned, GM or GCL is less e ective than CCL. 相似文献
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257.
Assessment of heavy metal bioavailability in contaminated sediments and soils using green fluorescent protein-based bacterial biosensors 总被引:2,自引:0,他引:2
A green fluorescent protein (GFP)-based bacterial biosensor Escherichia coli DH5alpha (pVLCD1) was developed based on the expression of gfp under the control of the cad promoter and the cadC gene of Staphylococcus aureus plasmid pI258. DH5alpha (pVLCD1) mainly responded to Cd(II), Pb(II), and Sb(III), the lowest detectable concentrations being 0.1 nmol L(-1), 10 nmol L(-1), and 0.1 nmol L(-1), respectively, with 2h exposure. The biosensor was field-tested to measure the relative bioavailability of the heavy metals in contaminated sediments and soil samples. The results showed that the majority of heavy metals remained adsorbed to soil particles: Cd(II)/Pb(II) was only partially available to the biosensor in soil-water extracts. Our results demonstrate that the GFP-based bacterial biosensor is useful and applicable in determining the bioavailability of heavy metals with high sensitivity in contaminated sediment and soil samples and suggests a potential for its inexpensive application in environmentally relevant sample tests. 相似文献
258.
生活水污泥油化试验研究 总被引:10,自引:0,他引:10
用碳酸钠与污泥混合,在压力4 ̄5kgf/cm^2、温度300 ̄450℃获得燃料油16%左右,气体各C1 ̄C3烃类占体积的约19%,臭气物质主要10种。 相似文献
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260.
本文从细微粒子污染导致灰霾形成的角度出发,首先开展了灰霾监测实验,并对实验数据进行频数和描述性分析,研究了以PM10为主的细微粒子污染与灰霾的影响关系。确定了以PM10日平均浓度为灰霾目的判定依据,并根据中国大陆PM10污染指数的分级标准建立了灰霾等级指数,从而形成了一套根据PM10日平均浓度来确定不同等级的灰霾发生概率的方法,为灰霾预测及灰霾治理提供一定的理论依据。 相似文献