Abstract
Although the organic fraction of municipal solid waste (OFMSW) and sewage sludge (SS) originate from the same urban area and contain similar organic matter, they are collected separately and handle...
Highlights
In the frame of applied microbiology and bioprocess engineering, the use of mixed microbial cultures (MMCs) is attracting remarkable attention for the development of novel bioprocesses that respond to changing environmental frameworks
Acidogenic fermentation was feasible to good extent under each condition tested, even though some variations of performance were observed, associated with the system stability
In the fermentation liquids (FL)-I, the higher OLR resulted in lower conversion yield of total COD into CODSOL and volatile fatty acid (VFA), in accordance to what reported by Hao et al.[22]
Summary
In the frame of applied microbiology and bioprocess engineering, the use of mixed microbial cultures (MMCs) is attracting remarkable attention for the development of novel bioprocesses that respond to changing environmental frameworks. A well-established example of MMC application consists of the production of a particular family of polyester, namely, polyhydroxyalkanoates (PHA) These biopolymers are synthesized as intracellular carbon and energy source mainly by numerous species of Gram-positive and/or Gram-negative microorganisms and by anaerobic photosynthetic bacteria and Archea.[1] Since they are completely biodegradable and have thermoplastic properties, the interest in these biopolymers is progressively increasing, in consideration of the possibility to use renewable resources (instead of fossil fuels) as carbon source for their synthesis.[2,3]. More investments are necessary to promote feasibility studies, possibly at a pilot-scale level, in order to quantify a reasonable range of PHA productivity and final polymer quality. These are crucial aspects for MMC derived PHA commercialization and relative market scenario, which presently does not exist yet.[4]
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