Response of an anaerobic granular sludge to chlorinated aliphatic hydrocarbons in different conditions
1998
Rodriguez, N. (Universidad Autonoma de Madrid (Spain)) | Sanz, J.L.
In spite of its importance, little attention as been paid thus far to the toxicity of chlorinated aliphatic hydrocarbons under methanogenic conditions. The effect of several parameters which can affect the toxicity of CHCl3, CCl4, C2H2Cll4 and trans-C2H2Cl2 on the acetoclastic methanogenic activity of anaerobic sludge was studied. The following conclusions were derived: (i) The extend of inhibition produced is a function of the toxicant concentration, the type and the amount of the biomass. A lag-period was detected for the inhibition produced by CHCl3 and trans-C2H2Cl2, while for the other compounds the inhibitory effect was instant. (ii) The recovery time for an anaerobic granular sludge exposed to different toxicants was a function of the extent of inhibition and the exposure time, and seemed to be independent of the toxicants used. (iii) The possible acclimatization of an anaerobic sludge to continuous exposure to a toxicant was dependent on the nature of the toxicant. The time required to acquire an activity similar to that of untreated controls was dependent on the concentration of the toxicant used. In our case adaptation was only obtained for CCl4
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