Use of a coupled SBR–MBR for treatment of produced water enriched by halophilic bacteria

Abstract

The performance of a sequencing batch bioreactor (SBR) coupled with a membrane bioreactor (MBR) for treatment of hypersaline produced water by insertion of a halophilic bacterial consortium was tested at three different organic loading rates (OLRs): 1, 2 and 4 (kg chemical oxygen (O2) demand (COD)/m3)/d. Four total dissolved solids (TDS) concentrations (20, 50, 80 and 120 g/l) were investigated in this study. At different TDS concentrations and OLRs, COD removal was found to be efficient at 91·3–99·5% and the amount of mixed liquor suspended solids (MLSS) varied from 4·61 to 9·88 g/l. The amounts of COD removal and MLSS increased with increased OLRs and decreased in hypersaline concentrations. Increases in TDS had a negative effect on membrane flux and fouling rates, but, in this hybrid system, the reduction in flux with increase in TDS was minor, while high-quality treated water was produced from the immersed membrane.

Evaluation of different strategies for efficient sporulation and germination of the MICP bacterium Lysinibacillus sphaericus strain MB284 (ATCC 13805)

“…The salinity of pore solutions in concrete varies depending on the salt content of the water and the sand which are used in its production, which can be as high as ∼ 90 g/l when seawater and sea-sand are used [24]. Although growth was observed to be higher in MSM, which has a higher concentration of ions than the EZi medium (Figure 4), it is unclear how halotolerant strain MB284 is [25]. To investigate the effect of different salt concentrations (up to 100 g/l) on the growth rate of germinated cells of strain MB284, endospores were inoculated into the MSM enriched by casamino acids, urea, and different salt concentrations, and the biomass concentration was measured at different time intervals (1 st , 2 nd , 6 th , 12 th , and 27 th day).…”