Effects of potassium monopersulfate (KMPS) on nitri cation activity, growth performance of Litopenaeus vannamei and bacterial community structure of sponge biocarrier with pre-cultured bio lm (SBBF) were analyzed through shaking ask experiments and L. vannamei aquaculture experiment. The change of ammonia oxidation rate (AOR) and nitrite oxidation rate (NOR) of SBBF under six KMPS concentration treatments (0 mg/L, 1 mg/L, 2 mg/L, 3 mg/L, 4 mg/L and 5 mg/L) was studied, the results showed that the AOR and NOR of SBBF treated with high concentrations of KMPS (3 mg/L, 4 mg/L and 5 mg/L) were signi cantly lower than those of the control group (CK) (p < 0.05). However, compared with the rst dosing of NH 4 Cl and NaNO 2 , the inhibition of KMPS on AOR and NOR was weakened after the second and third dosing times. The L. vannamei aquaculture experiment was set to four concentrations of KMPS (0 mg/L, 2 mg/L, 4 mg/L, 8 mg/L), the results showed that with the increase of KMPS dosage, the average and peak concentrations of NH 4 + -N and NO 2 − -N in each system signi cantly increased (P < 0.05). The nal body weight of shrimps signi cantly decreased (P < 0.05), high dose (8.0 mg/L) of KMPS reduced the survival rate by 9.33% than CK. High-throughput sequencing analysis of the bio lm structure showed that the relative abundance of Nitrospirota, Nitrosomonas and Nitrococcus, which is related to nitrogen cycling, and bene cial bacteria including Firmicutes and Bacilli decreased with the addition of KMPS (p < 0.05).
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