anaerobic digestion of chlorphenolic wastes
نویسندگان
چکیده
feasibility of methanolic wastes treatment containing chlorophenol in experimental uasb reactors i.e. r-i and r-ii working side by side constantly for a couple of almost 32 weeks were studied. uasb reactor r-i was initiated by utilizing the digested sludge alone, whereas, the uasb reactor r-ii was startedup by adding an activated carbon of an effective size 1.5-2.5mm to the digested sludge with the volume-volume ratio of 3:2. at low loading rates d” 0.5g-toc/l-d for r-i and d” 2.6g-toc/l-d for r-ii, it was observed that the effect of hrt on the toc reduction was not prominent, and in both the reactors the toc reduction effectiveness was noticed to be above 80%. an optimum olr to accomplish 80-85% toc and chlorophenol reduction effectiveness (at hrt e” 12hours) was observed to be 2.6g-toc/l-day and 10.8g-toc/l-day for reactor r-i and r-ii, respectively. it was also observed that to attain more than 80% toc removal efficiency at a constant olr of 6.5g-toc/l-day and at a hrt of 18-20hours, the maximum influent chlorophenol concentration should stay below 21mg/l and 29mg/l for reactor r-i and r-ii, respectively. the average vfas effluent concentration observed was 357mg/l and 230mg/l for the reactor r-i and r-ii, respectively. comparatively the production of biogas in reactor r-ii was less. the overall gas conversation rate observed at greater than 80% toc removal efficiency for r-i and r-ii was found to be 0.28l/g-codremoved and 0.17l/g-codremoved, respectively, with 60-62% of methane content for both the reactors. the results of this study suggested that the use of methanol as a medium to biodegrade chlorophenol in the presence of an activated carbon in a uasb reactor is an effective and feasible method at mesophilic temperature and neutral ph.
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عنوان ژورنال:
international journal of environmental researchناشر: university of tehran
ISSN 1735-6865
دوره 5
شماره 1 2010
کلمات کلیدی
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