Although OMBR process shows advantages over traditional MBRs (e.g. low membrane fouling and high quality of product
water), salt accumulation within the bioreactor remains a major challenge in this process. The accumulation of solutes in the bioreactor not only impacts pollutant removal efficiencies by affecting the biological activities of the activated sludge, it also significantly reduces the osmotic drive force across the FO membrane and thus dramatically lowers the water flux. Currently, salt removal in the OMBR process relies on the wastage of sludge (Lay et al., 2010), a process that restricts the OMBR operation, since an increase sludge wastage would result in the reduction of SRT and the loss of slow-growing microorganisms. Extensive sludge wastage would also increase the burden of subsequent sludge treatment. In this study, salt accumulation was controlled by wasting the supernatant and the sludge separately. This approach could be a promising resolution to the conflict between salt accumulation and SRT. Admittedly, the problem of salt accumulation in OMBR is still far from resolved, and more efficient ways to removal salt from the bioreactor would need to be developed before this process can be adopted commercially
Although OMBR process shows advantages over traditional MBRs (e.g. low membrane fouling and high quality of productwater), salt accumulation within the bioreactor remains a major challenge in this process. The accumulation of solutes in the bioreactor not only impacts pollutant removal efficiencies by affecting the biological activities of the activated sludge, it also significantly reduces the osmotic drive force across the FO membrane and thus dramatically lowers the water flux. Currently, salt removal in the OMBR process relies on the wastage of sludge (Lay et al., 2010), a process that restricts the OMBR operation, since an increase sludge wastage would result in the reduction of SRT and the loss of slow-growing microorganisms. Extensive sludge wastage would also increase the burden of subsequent sludge treatment. In this study, salt accumulation was controlled by wasting the supernatant and the sludge separately. This approach could be a promising resolution to the conflict between salt accumulation and SRT. Admittedly, the problem of salt accumulation in OMBR is still far from resolved, and more efficient ways to removal salt from the bioreactor would need to be developed before this process can be adopted commercially
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