Recirculation factor as a key parameter in continuous-flow biomass selection for polyhydroxyalkanoates production
نویسندگان
چکیده
The effectiveness of polyhydroxyalkanoates (PHA) production with mixed microbial cultures (MMC) largely depends on the selection PHA-storing microorganisms, conventionally performed in sequencing batch reactors (SBR). These, although easily allow establishment required feast and famine (FF) regime, can represent a factor cost increase when process is scaled up. Here, novel continuous-flow for MMC under FF conditions has been developed by using two sequentially operated reactors. reactor, having tubular configuration, was continuously fed synthetic mixture acetic propionic acids (at an organic loading rate 2.12 gCOD/L d) effluent this reactor part sent to CSTR reactor. recirculation (RC), that ratio between flow feeding main parameter investigated. Four different runs were RC varying from 1 8 its value caused decrease biomass residence time each intracellular PHA content almost linearly increased up 4 (with 34 ± 2%, wt/wt) dropped at condition that, however, showed maximum (58 5%, during accumulation tests. Indeed, relative abundance sequences affiliated putative bacteria 90.5 % dominated members Alphaproteobacteria class mostly represented genus Meganema (74%).
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ژورنال
عنوان ژورنال: Chemical Engineering Journal
سال: 2023
ISSN: ['1873-3212', '1385-8947']
DOI: https://doi.org/10.1016/j.cej.2022.140208