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Struktura mikrobiologiczna osadu z komór fermentacji mezofilowej w skali technicznej
Języki publikacji
Abstrakty
Anaerobic digestion is an important technology for the bio-based economy. The stability of the process is crucial for its successful implementation and depends on the structure and functional stability of the microbial community. In this study, the total microbial community was analyzed during mesophilic fermentation of sewage sludge in full-scale digesters. The digesters operated at 34–35°C, and a mixture of primary and excess sludge at a ratio of 2:1 was added to the digesters at 550 m3/d, for a sludge load of 0.054 m3/(m3•d). The amount and composition of biogas were determined. The microbial structure of the biomass from the digesters was investigated with use of next-generation sequencing. The percentage of methanogens in the biomass reached 21%, resulting in high quality biogas (over 61% methane content). The abundance of syntrophic bacteria was 4.47%, and stable methane production occurred at a Methanomicrobia to Synergistia ratio of 4.6:1.0. The two most numerous genera of methanogens (about 11% total) were Methanosaeta and Methanolinea, indicating that, at the low substrate loading in the digester, the acetoclastic and hydrogenotrophic paths of methane production were equally important. The high abundance of the order Bacteroidetes, including the class Cytophagia (11.6% of all sequences), indicated the high potential of the biomass for efficient degradation of lignocellulitic substances, and for degradation of protein and amino acids to acetate and ammonia. This study sheds light on the ecology of microbial groups that are involved in mesophilic fermentation in mature, stably-performing microbiota in full-scale reactors fed with sewage sludge under low substrate loading.
Fermentacja metanowa jest ważnym elementem biogospodarki. Efektywna eksploatacja reaktorów zależy od stabilności procesu determinowanej składem gatunkowym mikroorganizmów. W pracy badano strukturę mikrobiologiczną biomasy podczas mezofilowej fermentacji osadów ściekowych w skali technicznej. Do komór fermentacyjnych eksploatowanych w 34–35°C wprowadzano mieszaninę osadu wstępnego oraz nadmiernego w stosunku 2:1, w ilości 550 m3/d (0,054 m3/(m3•d)). Badane były ilość i skład wytwarzanego biogazu. Biomasę z fermentorów poddawano badaniom metagenomowym z wykorzystaniem wysokosprawnego sekwencjonowania. Wysoka jakość biogazu (ponad 61% zawartości metanu) była determinowana odsetkiem metanogenów w biomasie wynoszącym 21%. Udział bakterii syntroficznych w biomasie wyniósł 4,47%, a stabilną produkcję metanu zaobserwowano przy stosunku Methanomicrobia do Synergistia wynoszącym 4,6:1,0. Wśród metanogenów najliczniejsze były rodzaje Methanosaeta i Methanolinea, co wskazuje, że przy niskim obciążeniu komór fermentacyjnych acetoklastyczny i hydrogenotroficzny szlak produkcji metanu są równie ważne. Wysoka liczebność Bacteroidetes, w tym klasy Cytophagia (11,6% wszystkich sekwencji), wskazuje na wysoką zdolność biomasy do efektywnego rozkładu substancji lignocelulozowych oraz rozkładu białek i aminokwasów do octanu i amoniaku. Badania dostarczają danych na temat ekologii mikroorganizmów we wpracowanych, stabilnie funkcjonujących reaktorach fermentacji mezofilowej w skali technicznej zasilanych osadami ściekowymi w warunkach niskiego obciążenia substratowego.
Czasopismo
Rocznik
Tom
Strony
53--60
Opis fizyczny
Bibliogr. 48 poz., tab., wykr.
Twórcy
autor
- University of Warmia and Mazury in Olsztyn
autor
- University of Warmia and Mazury in Olsztyn
autor
- University of Warmia and Mazury in Olsztyn
Bibliografia
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Uwagi
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-8cec550e-9af6-44ae-9d28-70b4678d998a