Effects of pretreatment method of natural bacteria source on microbial community and bio-hydrogen production by dark fermentation

Optimization of Operational Parameters for Biohydrogen Production from Waste Sugarcane Leaves and Semi-Pilot Scale Process Assessment

“…(Table 4). These microorganisms have been previously reported as the major hydrogen producers in a sludge inoculum system (Kraemer and Bagley 2007), and the results are similar to those reported by Song et al (2012). These authors employed thermal treatment on a mixed consortium and reported a microbial community dominated by Clostridium sp.…”

Effects of pre-treatment technologies on dark fermentative biohydrogen production: A review

“…The various techniques that have been studied for inoculum pre-treatment include physical technologies such as thermal treatment or heat shock treatment (HST) (Song et al, 2012a;Cai et al, 2009;Liu et al, 2009;O-Thong et al, 2009;Ren et al, 2008;Zhu and B eland, 2006), freezing and thawing (Rossi et al, 2011;Liu et al, 2009), microwave irradiation (Singhal and Singh, 2014;Song et al, 2012b), ultrasound irradiation Wang et al, 2010), electric current (Jeong et al, 2013;Roychowdhury and Mcalister, 2000), aeration (Song et al, 2012a;Ren et al, 2008;Zhu and B eland, 2006;Wang et al, 2012), ultraviolet Wang et al, 2010Wang et al, , 2012, infrared (Song et al, 2012a) and gamma irradiation (Yin et al, 2014) and chemical treatment involving the use of acid or alkali Liu et al, 2009;Cai et al, 2009;O-Thong et al, 2009;Ren et al, 2008;Zhu and B eland, 2006), load-shock treatment (LST) (Luo et al, 2011(Luo et al, , 2010O-Thong et al, 2009) and methanogen inhibitors such as 2-bromoethanesulfonate (BES) or 2-bromoethanesulfonic acid (BESA) (O-Thong et al, 2009;Zhu and B eland, 2006), chloroform (Luo et al, 2010;Argun and Kargi, 2009), iodopropane (Zhu and B eland, 2006), acetylene (ValdezVazquez et al, 2006), linoleic acid (LA) Chaganti et al, 2012;…”

“…Since these SRB are also HCB while LAB may suppress HPB, their resistance to oxygen makes aeration ineffective for preventing inhibition of biohydrogen production. The aeration time investigated using aeration as a pretreatment technology has varied from 2 h to 14 days (Pan et al, 2010;Dong et al, 2010;Song et al, 2012a;Wang et al, 2012;Giordano et al, 2014). Giordano et al (2014) pre-treated granular sludge using aeration rates of 100 L air L À1 sludge h À1 for 2e14 days and reported a maximum enhanced H 2 yield after 12 days of aeration.…”

“…Besides ultraviolet, microwave and ultrasound irradiations, infrared and gamma irradiations have also been employed for inoculum pre-treatment prior to dark fermentative biohydrogen production (Song et al, 2012a;Yin et al, 2014). The principle behind infrared and gamma irradiation is similar to other irradiation technologies.…”

Effect of headspace carbon dioxide sequestration on microbial biohydrogen communities

“…Microbial community composition in a H 2 reactor directly affects the fermentation efficiency [21]. Therefore, it is important to explore the changes in species diversity and population distribution of the predominant H 2 producers due to the removal of CO 2 from the reactor headspace.…”