写真廃液の連続処理における生物活性炭の破過挙動

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  • Breakthrough of Biological Activated Carbon during Continuous Treatment of Photo-Processing Waste
  • シャシン ハイエキ ノ レンゾク ショリ ニ オケル セイブツ カッセイタン

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The use of sulfur-oxidizing bacteria (SOB) in corporation with granular activated carbon (GAC) to treat photo-processing waste (PW) has been established as one of the most effective options. Breakthrough behavi or of GAC during the continuous treatment using an SOB/GAC system was studied in this paper, in which a hypothesis has been proved that GAC effects as biological activated carbon in adsorbing the toxic/refractory compounds contained in PW therefore simultaneously enhancing the activity of SOB sludge.<BR>Long term continuous treatment (≈400 d) was performed during a range of thiosulfate (S2O32-) load and the hydraulic retention time (HRT) fixed as 0.8-3.7 kg-S2O32-/1/d and 7.7-1.9 d, respectively. The results demonstrated that the treatment effectiveness trends to worsen every period of 3 or 4 months, i. e., reactor pH, the dissolved organic carbon (DOC) and S2O32-in the effluent increased gradually, while formation rates of sulfate (SO42-) decreased to about 50%. During the 400 days treatment, three cases of worse trends were observed, and were then recovered by just renewing the GAC in the reactor. This suggests that absorption of GAC progressed in parallel with its regeneration, and then reached its saturation point while its further regeneration ability lost. Thus, to further clarify the adsorption capacity of the spent GAC, its equilibrium and comparison experi-ments with new GAC were examined, which confirmed that the spent GAC has been reaching breakthrough situation with no further adsorption capacity.

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