The Study of High-Concentration Tetrachloroethylene Treated by Anaerobic Biological Process
Date Issued
2005
Date
2005
Author(s)
Li, Shih-Wei
DOI
zh-TW
Abstract
Perchloroethylene (PCE) is one of the most frequently identified contaminants in soils and groundwaters because it has been widely used for degreasing in industry and as a solvent for dry cleaning. Many previous studies have shown that anaerobic biological treatments are capable of converting the heavily chlorinated compound into harmless metabolites. However, anaerobic digested sludge is seldomly applied directly to the treatment of PCE contamination. In this research, perchloroethylene-dechlorinating ability and feasibility of completely converting PCE to non-toxic metabolites were examined directly in anaerobic digested sludge from swine wastewater and domestic wastewater treatment plant.
According to the results of this study, digested sludge of swine waterwaste treatment plant can dechlorinate PCE into trichloroethylene (TCE) and dichloroethylene (DCE) but no further. In contract, digested sludge of domestic wastewater treatment plant can dechlorinate PCE through TCE, DCE, vinyl chloride (VC), and finally result in the nontoxic ethylene. This proves that certain kinds of anaerobic digested sludge are capable of directly breaking down PCE into the nontoxic ethylene. Besides, it has been found that the higher the sludge concentration and adding PCE by semi-continuous method (10 μmol/3 days) can speed up the detoxification processes.
Subjects
四氯乙烯
三氯乙烯
二氯乙烯
氯乙烯
生物還原脫氯反應
厭氧消化污泥
Perchloroethylene
trichloroethylene
dichloroethylene
vinyl chloride
anaerobic digested sludge
Type
thesis
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