The effect of volatile fatty acids on the inactivation of Clostridium perfringens in anaerobic digestion

Salsali, Hamidreza; Parker, Wayne; Sattar, Syed A.

doi:10.1007/s11274-007-9514-4

Cited by 47 publications

(33 citation statements)

References 17 publications

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“…VFA concentration alone, or in combination with pH, temperature, exposure time and the degree of sensitivity of specific types of microorganisms is believed to impact upon injury of microorganisms in anaerobic digestion (Abdul & Lloyd ; Salsali et al . ). Although there have been numerous studies detailing the extent of pathogen removal achieved by different stabilization technologies (Aitken et al .…”

Section: Resultsmentioning

confidence: 97%

The survival of multidrug‐resistant bacteria in thermophilic and mesophilic anaerobic co‐digestion of dairy manure and waste milk

Beneragama

Iwasaki

Lateef

et al. 2012

Animal Science Journal

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Anaerobic digestion is considered as a promising method to manage animal waste with antibiotic-resistant bacteria. Current research was conducted to investigate the survival of multidrug-resistant bacteria (MDRB) resistant to three groups of antibiotics: (i) cefazolin, neomycin, vancomycin, kanamycin (group 1); (ii) penicillin, oxytetracycline, ampicillin, streptomycin (group 2); and (iii) cefazolin, neomycin, vancomycin, kanamycin, penicillin, oxytetracycline, ampicillin, streptomycin (group 3), in anaerobic digestion of dairy manure and co-digestion of dairy manure and waste milk at 37°C and 55°C for 22 days, respectively. The population densities of three groups of MDRB on peptone, tryptone, yeast and glucose agar plates incubated at 30°C for 7 days before and after digestion showed 100% destruction in both digestates at thermophilic temperature. Overall reduction of more than 90% of three groups of MDRB was observed in mesophilic digestion with no significant differences (P > 0.05) between manure and milk mixture. Co-digestion of dairy manure and waste milk always produced significantly (P < 0.05) higher total gas and methane gas than digestion of manure alone at both temperatures. Gas production in each case was significantly (P < 0.05) higher in thermophilic digestion than in mesophilic digestion. The results demonstrate that thermophilic co-digestion of dairy manure and waste milk offers more benefits in terms of the environment and economy.

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Section: Resultsmentioning

confidence: 97%

The survival of multidrug‐resistant bacteria in thermophilic and mesophilic anaerobic co‐digestion of dairy manure and waste milk

Beneragama

Iwasaki

Lateef

et al. 2012

Animal Science Journal

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“…perfringens were induced to germinate during the thermal phase resulting in the inactivation of vegetative cells (Salsali et al . ). The same mechanism could have occurred with Cl.…”

Section: Discussionmentioning

confidence: 97%

Persistence of Clostridium difficile in wastewater treatment-derived biosolids during land application or windrow composting

Wang

Huber

et al. 2016

J Appl Microbiol

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“…It could be one reason for the highest methane yield obtained from sample 200 °C–0.5 h since sugars and short-chain organic fatty acids were relatively easier to be biodegraded by AD [42, 43]. It should be noted that sample 200 °C–2 h had higher amount of sugars and organic fatty acids (432 mg/g COD) compared to sample 170 °C–0.5 h (403 mg/g COD); however, it had significantly lower methane yield (259 mL CH 4 /g COD) compared to sample 170 °C–0.5 h (302 mL CH 4 /g COD), which indicated that other easily degradable organics might be present in 170 °C–0.5 h but not quantified in the present study.…”

Section: Discussionmentioning

confidence: 99%

Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Chen

Zhang

Rao

et al. 2017

Biotechnol Biofuels

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BackgroundHydrothermal liquefaction (HTL) has been well studied for the bio-oil production from biomass. However, a large amount of wastewater with high organic content is also produced during the HTL process. Therefore, the present study investigated the methane potentials of hydrothermal liquefaction wastewater (HTLWW) obtained from HTL of rice straw at different temperatures (170–320 °C) and residence times (0.5–4 h). The characteristics (e.g., total organic content, organic species, molecular size distribution, etc.) of the HTLWW were studied, and at the same time, microbial community compositions involved in AD of HTLWW were analyzed.ResultsThe highest methane yield of 314 mL CH4/g COD was obtained from the sample 200 °C–0.5 h (HTL temperature at 200 °C for 0.5 h), while the lowest methane yield 217 mL CH4/g COD was obtained from the sample 320 °C–0.5 h. These results were consistent with the higher amounts of hard biodegradable organics (furans, phenols, etc.) and lower amounts of easily biodegradable organics (sugars and volatile fatty acids) present in sample 320 °C–0.5 h compared to sample 200 °C–0.5 h. Size distribution analysis showed that sample 320 °C–0.5 h contained more organics with molecular size less than 1 kDa (79.5%) compared to sample 200 °C–0.5 h (66.2%). Further studies showed that hard biodegradable organics were present in the organics with molecular size higher than 1 kDa for sample 200 °C–0.5 h. In contrast, those organics were present in both the organics with molecular size higher and less than 1 kDa for sample 320 °C–0.5 h. Microbial community analysis showed that different microbial community compositions were established during the AD with different HTLWW samples due to the different organic compositions. For instance, Petrimonas, which could degrade sugars, had higher abundance in the AD of sample 200 °C–0.5 h (20%) compared to sample 320 °C–0.5 h (7%). The higher abundance of Petrimonas was consistent with the higher content of sugars in sample 200 °C–0.5 h. The higher Petrimonas abundance was consistent with the higher content of sugars in sample 200 °C–0.5 h. The genus Syntrophorhabdus could degrade phenols and its enrichment in the AD of sample 320 °C–0.5 h might be related with the highest content of phenols in the HTLWW.ConclusionsHTL parameters like temperature and residence time affected the biodegradability of HTLWW obtained from HTL of rice straw. More hard biodegradable organics were produced with the increase of HTL temperature. The microbial community compositions during the AD were also affected by the different organic compositions in HTLWW samples.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-017-0830-0) contains supplementary material, which is available to authorized users.

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The effect of volatile fatty acids on the inactivation of Clostridium perfringens in anaerobic digestion

Cited by 47 publications

References 17 publications

The survival of multidrug‐resistant bacteria in thermophilic and mesophilic anaerobic co‐digestion of dairy manure and waste milk

The survival of multidrug‐resistant bacteria in thermophilic and mesophilic anaerobic co‐digestion of dairy manure and waste milk

Persistence of Clostridium difficile in wastewater treatment-derived biosolids during land application or windrow composting

Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

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