Sundberg Cecilia, Jönsson Håkan
Department of Biometry and Engineering, Swedish University of Agricultural Sciences, PO Box 7032, SE 750 07 Uppsala, Sweden.
Biodegradation. 2005 Jun;16(3):205-13. doi: 10.1007/s10532-004-0628-1.
Inhibition of the degradation during low pH conditions has been observed in fed-batch composting systems. To analyse this phenomenon, fed-batch composting of food waste with different amounts of starting culture was examined in laboratory reactor experiments. Changes in temperature, carbon dioxide evolution, pH, solids, ash and short chain organic acids were measured. In reactors with a daily feed rate of 24% or less of the starting culture, thermophilic temperatures occurred and the pH and carbon dioxide evolution were high and stable after a starting period of 4-5 days. In reactors with a daily feed rate of 48% or more of the starting culture the composting process failed, as the pH dropped below 6 and remained there and the temperature and carbon dioxide evolution were low. It was concluded that the use of adequate amounts of starting culture consisting of active compost can efficiently prevent low pH conditions and process inhibition in fed-batch composting of food waste.
在分批补料堆肥系统中已观察到低pH条件下降解的抑制作用。为分析这一现象，在实验室反应器实验中对添加不同量起始菌剂的食物垃圾分批补料堆肥进行了研究。测定了温度、二氧化碳释放量、pH值、固体、灰分和短链有机酸的变化。在每日进料速率为起始菌剂24%或更低的反应器中，出现了嗜热温度，且在4 - 5天的起始期后，pH值和二氧化碳释放量较高且稳定。在每日进料速率为起始菌剂48%或更高的反应器中，堆肥过程失败，因为pH值降至6以下并保持在该水平，温度和二氧化碳释放量较低。得出的结论是，在食物垃圾分批补料堆肥中，使用适量由活性堆肥组成的起始菌剂可有效防止低pH条件和过程抑制。
