Shifts in microbial community structure and diversity in a novel waterfall biofilm reactor combined with MBBR under light and dark conditions

Abstract

In this study, a novel, low-cost, easy-maintenance and effective waterfall aeration biofilm reactor (WFBR) was designed to treat wastewater with MBBR.

Simultaneous Biological and Chemical Removal of Sulfate and Fe(II)EDTA-NO in Anaerobic Conditions and Regulation of Sulfate Reduction Products

“…Continuous addition of 2 mM Fe(III) resulted in a reduction of sulfide concentration by about 0.9 mM and no significant changes in total iron loss. The total iron concentration in the solution was about 14 mM, which was close to the total iron concentration studied by Zhang et al [36]. Considering that the addition of Fe(III)EDTA would increase the loss of total iron and the inhibition of EDTA on microorganisms, the Fe(III)EDTA concentration no longer increased and was maintained at 6 mM.…”

Combining a novel biofilm reactor with a constructed wetland for rural, decentralized wastewater treatment

“…The DNR also increases with a higher OLR. In a previous study [25,26], a high concentration of influent COD (2000 mg/L) also resulted in nearly 100% TN removal [25]. Overall it can be concluded that the WABR is a simple but efficient reactor for COD and N removal.…”

“…COD, ammonium and total phosphorus (TP) were measured spectrophotometrically according to standard methods [43] using HACH test kits and a DR 3900 VIS Spectrophotometer [26]. Nitrite and nitrate were measured by Dionex ICS-900 Ion Chromatography.…”

“…The schematic diagram of the WABR-CW system used in this study is illustrated in S1), providing ample sites for microbes to attach [26].…”

“…However, denitrification in the WABR is not always efficient and phosphorus removal has not been investigated or observed yet during WABR operation. As such, a WABR should be coupled with other treatment technologies to remove nitrogen and phosphorus from the waste water [25,26].…”