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Full-Text Articles in Environmental Engineering
Applied And Mechanistic Studies Of Microbial 17beta-Estradiol Degradation, Zhongtian Li
Applied And Mechanistic Studies Of Microbial 17beta-Estradiol Degradation, Zhongtian Li
Z Li
The presence of natural estrogens, a class of endocrine disrupting compounds, in water has caused increasing concerns over their adverse impacts on the health of aquatic eco-systems and human beings. In this study, adsorption characteristics of two natural estrogens, 17β-estradiol (E2) and estrone (E1), on granular activated carbon (GAC) were investigated in isotherm tests and in a GAC column. The GAC column was then converted to a biologically active carbon (BAC) column and the removal efficiency of E2 and its primary biodegradation intermediate E1 were monitored. During BAC operation, the impacts of various reactor operation parameters, such as the carbon …
Comparative Assessment Of Single-Stage And Two-Stage Anaerobic Digestion For The Treatment Of Thin Stillage, Noha Nasr, Elsayed Elbeshbishy, Hisham Hafez, George Nakhla, M. Hesham El Naggar
Comparative Assessment Of Single-Stage And Two-Stage Anaerobic Digestion For The Treatment Of Thin Stillage, Noha Nasr, Elsayed Elbeshbishy, Hisham Hafez, George Nakhla, M. Hesham El Naggar
Noha El-Sayed Nasr
A comparative evaluation of single-stage and two-stage anaerobic digestion processes for biomethane and biohydrogen production using thin stillage was performed to assess the impact of separating the acidogenic and methanogenic stages on anaerobic digestion. Thin stillage, the main by-product from ethanol production, was characterized by high total chemical oxygen demand (TCOD) of 122 g/L and total volatile fatty acids (TVFAs) of 12 g/L. A maximum methane yield of 0.33 L CH4/gCODadded (STP) was achieved in the two-stage process while a single-stage process achieved a maximum yield of only 0.26 L CH4/gCODadded (STP). The separation of acidification stage increased the TVFAs …