Herold T, Kliche R, Hensel A
Institut für Tierhygiene und Offentliches Veterinärwesen, Veterinärmedizinische Fakultät, Universität Leipzig.
Berl Munch Tierarztl Wochenschr. 1999 Dec;112(12):448-53.
In this study aerobic-thermophilic fermentation of untreated liquid pig manure was examined for the potential of inactivating pathogenic microorganisms. As microbial tracer organisms, Salmonella typhimurium DT 104 and Escherichia coli were used. An effective reduction of survival of these microorganisms could be demonstrated by aerobic fermentation at temperatures of 50 degrees C for at least 3 h. However, these optimal process conditions without the need of additional heating, can only be achieved by microbial substrate reduction. In contrast to the impact of temperature on hygienization processes, alteration of the pH value which occurs during fermentation had no or little influence on the tenacity of the tracer bacteria. Even under mesophilic reaction conditions the influence of the pH value was not measurable. A technical realisation of such an aerobic-thermophilic fermentation process for prophylactic disinfection is questionable since a large technical expenditure is necessary to control ammonia emission. Effective partial reduction of nitrogen, phosphate, and free carbon in liquid manure requires retention times of at least 48 h. However, thermophilic reaction conditions may ensure an effective hygienization of the final fermentation products.
在本研究中，对未经处理的液体猪粪进行好氧嗜热发酵，以考察其灭活病原微生物的潜力。使用鼠伤寒沙门氏菌DT104和大肠杆菌作为微生物示踪菌。在50℃温度下进行至少3小时的好氧发酵，可有效降低这些微生物的存活率。然而，这些无需额外加热的最佳工艺条件，只能通过减少微生物底物来实现。与温度对卫生化过程的影响相反，发酵过程中发生的pH值变化对示踪菌的存活几乎没有影响。即使在中温反应条件下，pH值的影响也无法测量。由于控制氨排放需要大量的技术投入，因此对这种用于预防性消毒的好氧嗜热发酵工艺进行技术实现存在疑问。有效部分减少液体粪便中的氮、磷和游离碳需要至少48小时的停留时间。然而，嗜热反应条件可确保最终发酵产物的有效卫生化。
