Valorization of methane from environmental engineering applications: A critical review

Ultra-sensitive ppb-level methane detection based on NIR all-optical photoacoustic spectroscopy by using differential fiber-optic microphones with gold-chromium composite nanomembrane

“…Methane (CH 4 ), a colorless, odorless, flammable and explosive gas, plays an important role in environmental atmospheric monitoring, clinical diagnosis and industrial control [1] , [2] , [3] . According to the 2021 WMO Greenhouse Gas Bulletin [4] , the concentration of methane in the atmosphere is about 1.8 ppm and arises yearly, which contributes to the greenhouse effect.…”

Co-cultivation enhanced microbial protein production based on autotrophic nitrogen-fixing hydrogen-oxidizing bacteria

“…variabilis strains. Similar growth promotion could also be achieved for methane-oxidizing bacteria, another group of sustainable MP producers, by co-cultivating them with heterotrophs [25,27,41]. Because adding either the strains with the genes for CO 2 fixation, N 2 fixation, and H 2 -oxidizing hydrogenases or those without some essential genes to X. variabilis could cause the positive effects (Table 1, Fig.…”

The grand challenge of water, waste, wastewater and emissions engineering and valorization

“…Quite more research has been performed on the valorization of gas emissions, e.g., CO, CO 2 , in other industrial sectors such as steel industry emissions, allowing to produce numerous compounds from such gases, such as fatty acids (Ragsdale andPierce, 2008), bioalcohols (ethanol, butanol, hexanol) (Fernández-Naveira et al, 2017), or numerous other bioproducts (Köpke and Simpson, 2020), which demonstrates the potential of gas valorization in the industrial sector but also many other ones, such as the (waste) water and waste sectors. Besides carbon dioxide, different (thermo) chemical (Ahmad et al, 2022), and biological (Jawaharraj et al, 2020) conversion processes are also available for CH 4 valorization.…”