Influence of Temperature and pH on Methanogenic Digestion in Two-phase Anaerobic Co-digestion of Pig Manure with Maize Straw

Zhang, Lei; Zhang, Keqiang; Gao, Wenxuan; Zhai, Zhongwei; Ji, Liang; Du, Lei; Feng, Xinmei

doi:10.12783/issn.1544-8053/13/2/s5

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“…Their absence could be explained by the rapidly decreasing pH (Fig. 3A), since most gut methanogens are neutrophilic (pH range 6.0-8.0) and sensitive to low pH (Serrano-Silva et al, 2014;Zhang et al, 2016) Taken together, the different substrates yielded different mixed acid profiles, with acetate as the main product. All complex substrates (cellulose, dried grass and starch waste) were fermented by the microbial community from guinea pig fecal samples.…”

Section: Product Profilesmentioning

confidence: 97%

Organic acid production from starchy waste by gut derived microorganisms

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Parameter Chemical routes Non-renewable feedstockspetrochemicals Fermentative routes Biobased feedstockcarbohydrates Price considerations Still cheaper than the renewable sources. Feedstock themselves do not contribute to the price as much as downstream processing Availability Availability expected to decrease in time Abundant and renewable Routes Developed routes, established technologies Routes under constant improvement, young technologies Yields and productivities Generally high Sometimes a large number of side products, diluted media, long reaction times Major disadvantages High energy demands (pressure and temperature). Catalysts disposal issues Sensitivity of microorganisms, nutrient requirements, complicated product recovery, large amounts of waste Environment effect Release CO2 that contributes to global warming Consume CO2 via TCA cycle Public awareness Decreasing popularity Increased interest in improving currently applied routes and innovations Current high costs of production prevent bio-based chemicals to be widely used. Thus, production processes from bio-based resources need to be developed and optimized. It is estimated that in 2050 approximately 30% (by weight) of chemicals will be obtained from renewable biomass (http://www.suschem.org) (Fiorentino and Ripa, 2017). Biomass is an abundant carbon-neutral renewable resource that can be used as a carbon source instead of fossil feedstocks (Fiorentino and Ripa, 2017). Production chains resulting from biomass are considered as "short-cycle carbon systems", which are more sustainable and preferable than those resulting from fossil resources, which are considered as "long-cycle carbon systems" (Kajaste et al., 2014; Fiorentino and Ripa, 2017). The transition from fossil based to bio-based economy needs the development of innovative processes to exploit the potential of biomass (Pleissner et al., 2017). Thus, utilization of food wastes or biomass and their conversion into valuable products require more attention as the implementation of such system is not yet successfully guaranteed. However, many criteria need to be considered for * Guyot et al. (2000) * Narita et al. 2004 Porphyromonadaceae. In the reactor with the Thai cow inoculum, Streptococcus spp. also increased from the start. When lactate was consumed, acetate, propionate and butyrate were produced (day 3-4). After day 3, bacteria belonging to five dominant groups, Bacteroides, Pseudoramibacter_Eubacterium, Dysgonomonas, Enterobacteriaceae and Porphyromonadaceae were detected and these showed significant positive correlations with acetate, propionate and butyrate levels. The complexity of rumen microorganisms with high adaptation capacity makes rumen fluid a suitable source to convert organic waste into valuable products without the addition of hydrolytic enzymes. Starch waste is a source for organic acid production, especially lactate.

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Section: Product Profilesmentioning

confidence: 97%

Organic acid production from starchy waste by gut derived microorganisms

Ayudthaya¹

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Influence of Temperature and pH on Methanogenic Digestion in Two-phase Anaerobic Co-digestion of Pig Manure with Maize Straw

Cited by 1 publication

References 0 publications

Organic acid production from starchy waste by gut derived microorganisms

Organic acid production from starchy waste by gut derived microorganisms

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