Rapid startup of thermophilic anaerobic digester to remove tetracycline and sulfonamides resistance genes from sewage sludge.

Spread of antibiotic resistance genes (ARGs) originating from sewage sludge is highlighted as an eminent health threat. This study established a thermophilic anaerobic digester using one-step startup strategy to quickly remove tetracycline and sulfonamides resistance genes from sewage sludge. At least 20days were saved in the startup period from mesophilic to thermophilic condition.

Depth-resolved microbial community analyses in the anaerobic co-digester of dewatered sewage sludge with food waste.

This study evaluated the impacts of FW addition on co-digestion in terms of microbial community. Anaerobic co-digestion (AcoD) reactors were conducted at gradually increased addition of food waste (FW) from 0 to 4kg-VSmd for 220days. Although no markable acidification was found at an OLR of 4kg-VSmd, the unhealthy operation was observed in aspect of an inhibited methane yield (185mLgVS), which was restricted by 40% when compared with its peak value.

Influence of fulvic acid on the colloidal stability and reactivity of nanoscale zero-valent iron.

This study investigated the effect of fulvic acid (FA) on the colloidal stability and reactivity of nano zero-valent iron (nZVI) at pH 5, 7 and 9. The sedimentation behavior of nZVI differed at different pH. A biphasic model was used to describe the two time-dependent settling processes (i.

Interaction between Cu2+ and different types of surface-modified nanoscale zero-valent iron during their transport in porous media.

This study investigated the interaction between Cu2+ and nano zero-valent iron (NZVI) coated with three types of stabilizers (i.e., polyacrylic acid [PAA], Tween-20 and starch) by examining the Cu2+ uptake, colloidal stability and mobility of surface-modified NZVI (SM-NZVI) in the presence of Cu2+.