کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
623897 | 1455375 | 2013 | 9 صفحه PDF | دانلود رایگان |
Despite the low biodegradability of seawater NOM, problems associated with biofouling are common in facilities that handle seawater. In this work, a fixed-film aerobic biofilter is proposed as an effective unit for preventing biofouling in such facilities.A packed-bed biofilter with an EBCT = 6–11 min was employed. The results demonstrated that the DOC is reduced by 6% and the BOD7 is reduced up to 15%. The LC-OCD analysis revealed that biofiltration abates the LMW neutrals and biopolymer fractions by 33 and 17%, respectively. However, the fractionation with UF membrane showed that the biofiltration process is able to degrade the more biodegradable compounds that have molecular weights that are greater than 1 kDa and compounds with molecular weights of less than 1 kDa.After biofiltration, the biological activity measured in terms of ATP removal was reduced by 60%. Finally, a test to evaluate the biofilm formation capacity of a water sample revealed reductions of ~ 94% when comparing biofiltered and non-biofiltered seawater. Therefore, a fixed-film aerobic biofiltration process could be a useful treatment for the removal of biodegradable organic matter from seawater and for improving the water quality in terms of less biofilm formation capacity.
► NOM in seawater is essentially refractory but can cause biofouling problems in seawater facilities.
► Biofouling can be effectively reduced by depleting easy biodegradable matter.
► A biofilter operated at EBCT = 6–11 min can reduce DOC and BOD up to 15%.
► Biofiltration shifts organic matter from higher than 1 kDa to lower than 1 kDa which is less biodegradable.
► A biofilter is able to prevent biological activity and thus reduce the biofilm formation capacity downstream more than 90%.
Journal: Desalination - Volume 316, 1 May 2013, Pages 8–16