高温条件下でのコンポスト化における初期の昇温速度と種菌の添加が有機物の分解におよぼす影響 [in Japanese] Effects of Raising Temperature in Early Stage of Thermophilic Composting on Composting Stimulation with Various Kinds of Seeds [in Japanese]
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コンポスト化初期の昇温速度の変化と添加する種菌 (3種類) の違いがコンポスト化過程における有機物分解速度におよぼす影響を定量的に検討した。昇温速度として, 室温から設定温度の60℃まで20時間をかけて昇温させる緩速昇温と5時間で昇温させる急速昇温の2通りを設定した。昇温速度の影響は種菌の種類によって異なり, 昇温速度にかかわらず有機物が良好に分解して, コンポスト化を促進する種菌, いずれの昇温速度でも有機物の分解が中断して, 促進効果が見られない種菌, 急速昇温では有機物が良好に分解するが, 緩速昇温では有機物の分解を中断する種菌の存在が認められた。<BR>また, それぞれの種菌は微生物相が異なり, コンポスト化過程における微生物相の変化も異なっていた。コンポスト化促進の効果が見られる場合には, コンポスト化初期に好熱性細菌が速やかに増殖し, コンポスト化全般に渡って10<SUP>9</SUP>cfu/g-ds付近の高密度に存在すること, コンポスト化後半には好熱性放線菌が10<SUP>7</SUP>cfu/g-ds程度にまで増えていたことを確かめた。
Quantitative analysis on the effects of rising temperature speed in the early stage of composting on the degradation rate of organic materials was made for three kinds of seeds added to the materials. Temperature raise was conducted in two ways. One was a slow raise which took 20 hours from room temperature to 60°C and the other was a quick raise which took only 5 hours. The effects of raising the speed were found to be dependent on the kind of seeds used for composting. Based on effects on composting, those seeds were assigned to the following 3 types: The first one showed a stimulatory effect on composting since it led to satisfactory degradation of organic materials independent of the temperature raise. The second was that giving rise to no significant effects since the degradation of the organic materials was discontinued at any rising speed of temperature. And the third one indicated that the effects of seeding are varied depending on the rising speed of temperature.<BR>The microflora in the seeds as well as the changes in microflora in the progress of composting were significantly different among the seeds. Stimulatory effects of seeding were also observed. Thermophilic bacteria quickly proliferated at an early stage of composting and existed at a high concentration around 10<SUP>9</SUP>cfu/g-ds throughout composting. The concentration of thermophilic actinomycetes reached approximately 10<SUP>7</SUP>cfu/g-ds in the later stage of composting.
- Journal of the Japan Society of Material Cycles and Waste Management
Journal of the Japan Society of Material Cycles and Waste Management 7(5), 225-233, 1996-09-30
Japan Society of Material Cycles and Waste Management