ニトロフェノール類を吸着した活性炭の微生物再生 : 活性炭の微生物再生(第3報)

概要

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The adsoption of o-, m- and p-nitrophenol on granular activated carbon and the biological regeneration of the activated carbon were studied. Regeneration was carried out by aerating the carbon of 6 or 12 h in an aeration tank containing activated sludge acclimated to the adsorbed nitrophenol. The amount of degraded nitrophenol was estimated from the resorption ability of the biologically regenerated carbon.The adsorption of nitrophenol on activated carbon was little afected by pH at levels below the pk_a of adsorbates, but decreased at pHs higher than the pk_a. Nitrophenol was desorbed from the carbon more easily under the same conditions. Biological treatment of carbon with adsorbed o-nitrophenol (pk_a=7.23) at pH 8.0 and p-nitrophenol (pk_a=7.15) at pH 8.5 restored 72 and 69 per cent of the adsorption capacity respectively. Treatment at pH 7.0,however, restored only 50 per cent of the capacity in both cases. In the case of activated carbon with adsorbed m-nitrophenol, only 43 and 52 per cent of the adsorption capacity was restored at pH 7.0 and 8.0 respectively because of its high pk_a value (pk_a=8.40). These results indicate that activated carbon can be effectively regenerated by dissociation of the adsorbed nitrophenols.
社団法人日本生物工学会の論文
1984-05-25