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Chicken Eggshell as an Innovative bioflocculant in Harvesting biofloc for Aquaculture Wastewater Treatment

Journal of Renewable Materials 2023年第5期11卷 2321-2332页

作者： Hajjar Hartini Wan Jusoh Nor Azman Kasan Hidayah Manan Nurfarahana Mohd Nasir Fareza Hanis Mohd Yunos Sofiah Hamzah Ahmad Jusoh Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia TerengganuKuala NerusTerengganu21030Malaysia Institute of Tropical Aquaculture and Fisheries(AKUATROP) Universiti Malaysia TerengganuKuala NerusTerengganu21030Malaysia Faculty of Engineering Universiti Putra MalaysiaUPM SerdangSelangor Darul Ehsan43400Malaysia

Implementation of biofloc technology(BFT)system in aquaculture industry shows high productivity,low feed conversion ratio,and an optimum culture *** study was divided into two *** first phase involved maintaining the water quality using the optimum carbon-to-nitrogen ratio by manipulating pH in culture *** second phase examined the performance of harvesting biofloc(remaining phytoplankton and suspended solids in the system)using chicken eggshell powder(CESP).This study showed that pH 7 to 8 were the best biofloc performance with high removal percentage of ammonia(>99%)with a remaining ammonia concentration of 0.016 mg L^(−1)and 0.018 mg L^(−1),*** second phase of this study was performed to determine the optimal formulation and conditions of using CESP as a bio-flocculant in harvesting excess *** use of eggshell showed a higher harvesting efficiency of more than 80%under the following treatment conditions:0.25 g L^(−1)of eggshell dosage;with rapid and slow mixing rates of 150 and 30 rpm,respectively;30 min of settling time;settling velocity of 0.39 mm s^(−1)and pH of 6 to ***,the results indicated that biofloc would be the best green technology approach for sustainable aquaculture wastewater and the CESP is an organic matrix that environmental-friendly bio-coagulant for biofloc harvesting.

关键词： Chicken eggshell aquaculture biofloc coagulant water quality harvesting

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

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Aquaculture and Fisheries 2023年第6期8卷 617-625页

作者： Hanwen Zheng Guozhi Luo Godwin Abakari Guoji Lv Hongxin Tan Wenchang Liu Shanghai Engineering Research Center of Aquaculture(Shanghai Science and Technology Committee) Shanghai Ocean UniversityShanghai201306China Key Laboratory of Freshwater Aquatic Genetic Resources(Ministry of Agriculture of PR China) Shanghai Ocean UniversityShanghai201306China National Demonstration Center for Experimental Fisheries Science Education(Ministry of Education of PR China) Shanghai Ocean UniversityShanghai201306China

In recirculating aquaculture systems,nitrification is usually accelerated by inoculating nitrifier or mature *** 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 *** 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’***,the influent’s hydraulic retention time(HRT)was reduced from 12 h to 6 h following the successful establishment of *** 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 *** 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 ***,the other groups did not demonstrate a similar *** 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

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Sexual Reversal with 17α-Methyltestosterone in Oreochromis sp.:Comparison between Recirculation Aquaculture System(RAS)and biofloc Technology(BFT)

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Journal of Agricultural Science and Technology(A) 2019年第2期9卷 131-139页

作者： Carlos Arturo David-Ruales Eliana Marcela Betancur-Gonzalez Ruben Dario Valbuena-Villareal Animal Science Program Corporación Universitaria LasallistaCaldas 0554Colombia Department of Exact and Natural Sciences Universidad Surcolombiana4100Colombia

Precocity in tilapia implies the use of several methods of obtaining monosex seed;the most common tends to use masculinizing hormone 17α-methyltestosterone(17αMT),with variable *** the objective of this study was to compare the efficiency of the sexual reversion process using 17αMT,in a recirculation system and in *** a totally randomized design,three tanks for recirculation(T-RAS)and three tanks for biofloc(T-BIO)with a capacity of 200 L effective volume were taken and filled with 1,056 larvae of Oreochromis sp.,without reversing and with an initial weight of 0.02 g and an initial total length of 1.4 *** study was carried out during 65 d,the fish were fed(10%biomass,adjusted every 15 d)by a commercial diet at 45%of crude protein that included 17αMT(60 mg/kg).Water quality,microbiology,zootechnical and gonadal analysis were *** the water quality results showed that just dissolved oxygen(DO),temperature(T-°C)and alkalinity did not show significant ***,in the productive parameters there were significant differences in the final length,the gain in length and in K which were better in *** microbiological ones did not present significant differences between the ***,the percentage of reversion was significantly better in ***,this study suggests that settleable solids concentrations above 35 cm decrease the efficiency of the sexual reversion for this species.

关键词： Oreochromis sp. biofloc recirculation aquaculture system 17α-methyltestosterone

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