中温メタン発酵におけるsludgeの影響(生物化学工学特集号-I廃液処理)

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In a previous report the effects of the concentration of digested sludge in fermentive fluid on thermophilic methane fermentation was studied and it was recognized that digestion was remarkably accelerated with the increase of the sludge concentration in fluid. In this paper, the effects of digested sludge concentration in fermentive fluid on digestive efficiency was investigated during mesophilic methane fermentation (37〜38℃). Digestion studies were carried out through continuous fermentation using molasses distillery waste and wool scouring waste as raw slop. 200-250 ml of seed fluid was added to each digestor (300 ml flask) and it was kept in a water bath during all of the tests. The amount of loading of the slop was gradually increased untill it was over load, and the effect of the digested sludge on the digestive efficiency was studied.1. Treatment of molasses distillery waste The concentraiton of the digested sludge in fluid was adjusted to the range of 2〜40 vol. % (1.500G-10 min. centrifuged) as shown in Table 2. The content of volatile matter in the slop was found to be 5.04%. The loading to the digestor and the gas production at the various sludge concentrations are shown in Fig. 2. Methane fermentation was accelerated in accordance with the increase of the sludge concentration in fluid as in the previous thermophilic studies.The maximum loading in that case was 2g/l/day as volatile matter in 5% sludge, 4g/l/day in 10% and 6g/l/day in 30%. The relationship between the concentration of the digested sludge and the maximum amount of loading is illustrated in Fig. 3. The data of the previous thermophilic digestion studies are also plotted in Fig. 3. When the sludge concentration was lower than 30%, the linear relationship between the sludge concentration and the maximum amount of loading was obtained in a log-log diagram both during mesophilic and thermophilic digestions. Their maximum loadings were formulated as follows; Mesophilic : L=1.5S^<0.41> Thermophilic : L=3.8 S^<0.41> L : Maximum loading as volatile matter (g/l/day) S : Sludge concentration (vol.% 1,500 G-10 min. centrifuged) 2. Treatment of wool scouring waste The sludge concentration was adjusted to 5,10 and 20% and wool scouring waste containing 1.86% volatile matter was used as raw slop.The effects of the sludge concentration on gas production are illustrated in Fig. 4. Twice the amount of fermentive gas was produced than the amount of the added slop when the content of the digested sludge was 5%, 3 times when 10% and 5 times when 20%. In Fig. 4,the results of the thermophilic digestion in the factry are shown. However, in this case, sludge concentration was 3〜4%. Even when the mesophilic digestion was operated at a volume of 10% or more of the sludge concentration, it was possible to have a similar capacity to thermophilic digestion in the usual plant.The results indicate that the capacity of the mesophilic digestion was multiplied 2〜3 times with the increase of the sludge concentration in fermentive fluid compared with the conventional mesophilic digestion.
社団法人日本生物工学会の論文
1965-06-25

中温メタン発酵におけるsludgeの影響(生物化学工学特集号-I廃液処理)

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