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- W130115181 abstract "The anaerobic digestion process has excellent potential for the treatment of warm industrial wastewaters. However this process is generally considered to be especially sensitive to many toxicants which occur occasionally or chronically in industrial wastewaters. Cyanide and chloroform were selected as sample toxicants which show inhibition of methane production at concentrations less than 1 mg/1. This study was directed toward an evaluation of the inhibition pattern of these two toxicants. The effect of toxicant concentration on methane production recovery pattern was determined. Suspended growth systems were used to study toxicity acclimation characteristics and recovery patterns. These systems demonstrated that the methanogens can acclimate and recover from cyanide and chloroform concentrations which were heretofore considered lethal. Prolonged periods of no methane production were not indicative of ultimate process failure. Anaerobic filters metabolizing acetate were fed gradually increasing concentrations of cyanide and chloroform to establish the maximum concentration which could be tolerated without inhibiting methane production. With acclimation, the anaerobic filters could tolerate 20 to 40 mg/1 of cyanide and chloroform without inhibition of methane production. One day slug doses of 750 mg/1 cyanide and 200 mg/1 of chloroform were administered to acclimated anaerobic filters of one day hydraulic detention time. Severe inhibition of methane production would result the following day, but complete recovery of methane production would be observed four days later. In summary, even though cyanide and chloroform show extreme toxicity to unacclimated methanogens, with proper attention paid to solids retention time and acclimation rate, the toxicity tolerance could be increased 50 fold." @default.
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- W130115181 date "1981-01-01" @default.
- W130115181 modified "2023-10-18" @default.
- W130115181 title "THE RESPONSE OF METHANE FERMENTATION TO CYANIDE AND CHLOROFORM" @default.
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- W130115181 doi "https://doi.org/10.1016/b978-1-4832-8438-5.50069-8" @default.
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