Effect of seeding biofloc on the nitrification establishment in moving bed biofilm reactor(MBBR)  

作　　者：Hanwen Zheng Guozhi Luo Godwin Abakari Guoji Lv Hongxin Tan Wenchang Liu 

机构地区：[1]Shanghai Engineering Research Center of Aquaculture(Shanghai Science and Technology Committee),Shanghai Ocean University,Shanghai,201306,China [2]Key Laboratory of Freshwater Aquatic Genetic Resources(Ministry of Agriculture of PR China),Shanghai Ocean University,Shanghai,201306,China [3]National Demonstration Center for Experimental Fisheries Science Education(Ministry of Education of PR China),Shanghai Ocean University,Shanghai,201306,China

出　　处：《Aquaculture and Fisheries》2023年第6期617-625,共9页渔业学报（英文）

基　　金：the Shanghai Municipal Science and Technology Commission Project(19DZ2284300).

摘　　要：In recirculating aquaculture systems,nitrification is usually accelerated by inoculating nitrifier or mature biocarriers.In this study,the performance of the establishment of nitrification in the MBBR according to three different strategies:conventional method(Control group A),inoculation with biofloc recovered from a tilapia biofloc culture system(Group B),and addition with extra nitrite(Group C)in the Moving bed biofilm reactor(MBBR)was compared.Among them,the biofloc-inoculated group considerably accelerated the nitrification process in the MBBR(38 d),which is roughly 18 d faster than the control group(A)(56 d)and 21 d faster than group C(59 d).Less ammonia(8 mg/L NH_(4)^(+)-N,10 mg/L in other groups)and external nitrite(2 mg/L NO_(2)􀀀^(-)N)in the influent caused effluent ammonia to drop more slowly(5 d slower than the control group,8 d slower than the B group),which is detrimental to the nitrification process’development.Notably,the influent’s hydraulic retention time(HRT)was reduced from 12 h to 6 h following the successful establishment of nitrification.During the adaptation to reduced HRT,the MBBR inoculated with biofloc experienced short-term changes in the water quality index of the effluent water,whereas the other groups did not.The biofilm seeded with biofloc had the highest mean gray value ratio(1.42)of live/dead cell fluorescence,which grew better and could cover the entire groove under multiple microscope observations.However,the other groups did not demonstrate a similar trend.In summary,the research found that seeding biofloc use as nitrification bioaugmentation into the MBBR of the recirculating aquaculture system(RAS)to greatly speed up the nitrification process.

关 键 词：Recirculating aquaculture system Moving bed biofilm reactor NITRIFICATION Biofloc BIOAUGMENTATION 

分 类 号：S96[农业科学—水产养殖]