製紙スラッジ(PS)のメタン発酵に及ぼす化学・鉱物組成の影響とカスケード型リサイクルへの応用

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We tried to methane fermentation treatment for creating new recycling process of paper sludge (PS) corrected from Fuji city, Shizuoka prefecture. PS consists of cellulose through out paper remanufacturing processes and some kinds of clay minerals (e.c. talc, kaolinite, calcite) for adding materials as filler and pigment. The cellulose in PS can be used for the material of methane fermentation. The methane bacteria used for this investigation are taken from livestock sewage of methane fermentation facility in Chiba prefecture. We investigated the relationship between the mineral composition of PS and the quantity of methane gas, and we clarified the effects of clay minerals to methane fermentation. And we evaluated the chemical and mineralogical adequacy of PS as the material for methane fermentation. Obtained conclusions are shown as follows. The characteristics of suitable PS for methane fermentation are (1) ash content is about 8.2〜30%, and the "ash rate" (ash/organic component) is about 0.2〜2.0, (2) the amount of calcite content is about 37%-52%, (3) CaO in ash corresponding to 1g of organic component is about 0.1-0.7g, (4) nothing chemically treated (pure) cellulose is desirable for methane fermentation. The calcite in methane fermentation process have two important roles, one of which is the pH buffering role of digestive liquid and the other is the supplying source of minor element (Ca) for methane bacteria. Through methane fermentation process, excess calcite in PS is consumed, and the residual materials are good for zeolite synthesis. PS can be used for the material of multiple stage (cascade type) recycling process which consist methane fermentation process (1^<st> stage) and the zeolite synthesizing process (2^<nd> stage) using residual material of 1^<st> stage.
2008-11-07

製紙スラッジ(PS)のメタン発酵に及ぼす化学・鉱物組成の影響とカスケード型リサイクルへの応用

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