OD汚泥と廃油揚げを主体とする7種の廃棄物系バイオマスの高濃度混合消化  [in Japanese] High-solids anaerobic co-digestion of seven kinds of waste biomass mainly consisting of dewatered sludge produced in an oxidation-ditch process and waste fried Tofu.  [in Japanese]

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Abstract

小規模な市町村で発生する様々な有機性廃棄物を混合処理し,バイオマス資源を地域内で循環させることを目的として,小規模下水処理場に容積1m<sup>3</sup>のメタン発酵装置を設置し,高濃度混合嫌気性消化実験を行った.オキシデーションディッチ法から発生する汚泥(OD汚泥)と廃油揚げ(生タイプと乾燥タイプ)を主体とし,し尿,浄化槽汚泥,接触酸化汚泥,および給食残渣からなる混合基質(TS8.8%)を連続投入した結果,平均有機物負荷2.5kg-VS/m<sup>3</sup>/dの条件下で,投入混合基質VS1kgあたり0.29Nm<sup>3</sup>のガスを安定的に回収でき,VS分解率は37%であった.また,消化汚泥の脱水性は使用したOD汚泥と同程度であり,肥効分析の結果から消化汚泥の肥料としての有効性が高いことが示された.

 To achieve concentrated treatment of several organic wastes and promote the recycle of waste biomass in local towns, a high concentrated continuous co-digestion experiment was conducted in a 1m<sup>3</sup> of mesophilic digester. The waste biomass mixture of which TS was approximately 8.8% consisted of waste sludge from an oxidation ditch process (OD), a contact aeration process and a septic tank, human waste, kitchen garbage and two kinds of fried tofu (raw type and dry type). With an average organic loading rate of 2.5 kg-VS/m<sup>3</sup>/d, digestion operated stably. Biogas yield of waste mixture was 0.29 Nm<sup>3</sup>/kg-VS, and average VS removal ratio was 37%. No significant difference was shown of the dewatering characteristics of digested sludge, compared to the input OD sludge. Fertilizer effect analysis shows that digested sludge quality met the Fertilizer Control Act, , and high fertilizer efficicency was suggested.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 70(7), III_425-III_432, 2014

    Japan Society of Civil Engineers

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