Abstract
The relative importance of each of three dechlorinating species to overall organochlorine removal from bleached kraft-mill effluents (BKME) was assessed. Ancylobacter aquaticus A7, Pseudomonas P1, and Methylobacterium CP13, strains indigenous to a BKME treatment system, were tested for growth on chlorinated acetic acids and alcohols, and for adsorbable organic halogen (AOX) reduction in batch cultures of sterile BKME from three sources. A. aquaticus A7 exhibited the broadest substrate range, but could only affect significant AOX reduction in softwood effluents. Methylobacterium CP13 exhibited a limited substrate range, but was capable of removing significant amounts of AOX from both hardwood and softwood effluents. By contrast, Pseudomonas sp. P1 exhibited a limited substrate range and poor to negligible reductions in AOX levels from both effluent types. Mixed inocula of all three species combined and inocula of sludge from mill treatment systems removed as much AOX from softwood effluents as did pure populations of Methylobacterium CP13. When BKME was hydrolysed prior to AOX analysis, the subsequent estimates of recalcitrant, or non-hydrolysable, AOX levels were far less variable than their counterpart total AOX measures. It is suggested that this is a relevant and useful measure of AOX for biodegradation studies.
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Fulthorpe, R.R., Allen, D.G. A comparison of organochlorine removal from bleached kraft pulp and paper-mill effluents by dehalogenating Pseudomonas, Ancylobacter and Methylobacterium strains. Appl Microbiol Biotechnol 42, 782–789 (1995). https://doi.org/10.1007/BF00171962
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DOI: https://doi.org/10.1007/BF00171962