ОПРЕДЕЛЕНИЕ РАЦИОНАЛЬНЫХ РЕЖИМНЫХ ПАРАМЕТРОВ ФЕРМЕНТАЦИИ БИОВОДОРОДА С ИСПОЛЬЗОВАНИЕМ CLOSTRIDIUM BUTYRICUM И ENTEROBACTER CLOACAE НА ГИДРОЛИЗАТАХ СОЛОМЫ, АКТИВИРОВАННОЙ ПАРОВЗРЫВНОЙ ОБРАБОТКОЙ
DOI 10.12737/2073-0462-2024-68-76 УДК 631.147
Ключевые слова:
солома, паровзрывная обработка, гидролиз, ферментация, биоводород.Аннотация
Исследования проводили с целью определения возможности использования сельскохозяйственных отходов, в частности, соломы для производства биоводорода. В работе использовали два типа гидролизатов соломы (после кислотного и ферментативного гидролиза), предварительно активированной паровзрывной обработкой при температурах водяного пара 100, 165, 210 0С. Гидролизаты разбавляли дистиллированной водой до концентраций редуцирующих веществ (РВ) в них 1,0; 1,5 и 2,0% от их массы с целью определения рациональной концентрации. На 18 образцах гидролизатов испытывали две культуры анаэробных микроорганизмов – штамм бактерий рода Clostridium butyricum E.VI.3.2.1 (№ ВКПМ B-9619), штамм бактерий рода Enterobacter cloacae (№ ВКПМ B-1980). Температуру ферментации для всех проб устанавливали равной 37±0,5 oС, pH – 5,5±0,1. Выделившийся газ накапливали в газгольдере, через каждые 12 ч его пробы отбирали и анализировали на объемное содержание водорода. После установления рациональной начальной концентрации субстрата, температуры паровзрывной активации соломы, вида гидролизата и наибольшего выхода биоводорода, дополнительно изменяли температуру культивации и pH для каждой культуры с целью выявления рациональных параметров: для Clostridium butyricum температуру культивации устанавливали на уровне 32±0,5; 37±0,5 и 42±0,5 oС, для Enterobacter cloacae – 36±0,5; 37±0,5; 38±0,5 oС; pH для всех проб устанавливали в диапазоне 5…6 с шагом 0,5±0,1). На кислотных гидролизатах соломы лучшую продуктивность демонстрировали Clostridium butyricum (температура паровзрывной обработки 165 oС) – выход водорода составил 73 мл/г, на гидролизатах, ферментированных Enterobacter cloacae (температура паровзрывной обработки 210 oС), выход водорода был равен 50 мл/г. Обе культуры способны продуцировать максимальное количество водорода при концентрации редуцирующих веществ 2%. Рациональная температура ферментации для Clostridium butyricum – 37±0,5 oС, для Enterobacter cloacae – 36±0,5 oС, для обеих культур – рН=6.
Литература
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15. Redwood M, Mikheenko I, Sargent F. Dissecting the roles of Escherichia coli hydrogenases in biohydrogen production. FEMS microbiology letters. 2008; Vol.278. 1. 48-55 p. doi: 10.1111/j.1574-6968.2007.00966.x.
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