Dechlorination of High Concentrations of Tetrachloroethylene Using a Fixed-bed Reactor

Halogenated organic compounds having many beneficial applications, both in industries and agriculture sectors. Basically, the uses are as pesticides, solvents, surfactants, and plastics. However, their large, widespread uses throughout the world have resulted the negative impact on the environment. Considering their treatment process are widely accepted by using the bioreactor systems. The large variety of microorganisms present in the bioreactor and their interaction is the key to the effective treatment and removal of these compounds. Usually the microbes produce the enzymes known as dehalogenase to remove the halogen form the compounds to make it non-toxic. Many of the different steps and about the microbial groups in degradation process of halogenated compounds are well understood, but more details concerning the microbial community are yet to be discovered. This chapter describes about the different dehalogenation systems available in microbes and their ultimate application in different bioreactor systems for the degradation analysis of several harmful halogenated compounds.

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Characterization of Task-weighted Agricultural Dust Exposure of Vineyard Workers

Lee¹

2010

Korean Journal of Environmental Health Sciences

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Agricultural workers are often exposed to high levels of dust during field operations. A systematic exposure assessment of annual task-weighted exposure has not been thoroughly examined. The occupational dust exposure in two wine grape vineyards was measured. Exposure levels to total and respirable dust were determined for a 1-year cycle of work. An operation profile including the frequency of tasks was established. The means of total and respirable dust exposure were 1.08 mg/m 3 and 0.07 mg/m 3 , respectively. Based on the exposure for each task and the task frequency, task-weighted mean exposures to total and respirable dust were estimated as 1.115 mg/m 3 and 0.079 mg/m 3 , respectively. The task-weighted exposure was significantly represented by three operations and could be attributed to the exposure frequency rather than the exposure intensity of operations. The measurement of a few of the most frequent tasks may be an alternative method of estimating task-weighted exposure. Agricultural dust exposure can be significantly reduced by targeting those tasks most important to task-weighted dust exposure.

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Dechlorination of High Concentrations of Tetrachloroethylene Using a Fixed-bed Reactor

Cited by 5 publications

References 65 publications

Degradation of tetrachloroethene using aerobic Sphingopyxis ummariensis bacteria in a gas-recycling fixed-bed bioreactor

Degradation of tetrachloroethene using aerobic Sphingopyxis ummariensis bacteria in a gas-recycling fixed-bed bioreactor

Microbial Bioreactor Systems for Dehalogenation of Organic Pollutants

Characterization of Task-weighted Agricultural Dust Exposure of Vineyard Workers

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