[Cultivation of in Digested Piggery Wastewater Pretreated by SBR with Operating Conditions Optimization].

Digested piggery wastewater(DPW) contains high concentrations of nitrogen and phosphorus which could be used as a cost-effective culture medium for . However, would be limited by many factors in the complex composition of DPW, especially the high concentration of ammonium. In this paper, a traditional sequencing batch reactor(SBR) was used to remove these inhibitors in DPW. The retention of nitrate and nitrite in the effluent, which was used as nitrogen source for cultivating , was studied at different ratios of chemical oxygen demand(COD) to total nitrogen(TN) in the influent. By comparing the growth of in the related effluents, the operation condition of SBR was optimized. The lab-scale cultivation results showed that possessed a high biomass yield of 0.084 g·(L·d) in the effluent when the COD/TN ratio of SBR influent was 3.0. In particular, the concentrations of ammonium, nitrate and nitrite in the effluent were 51.2 mg·L, 91.6 mg·Land 213.1 mg·L, respectively. Furthermore, the aforementioned effluent was also used to culture in a 120 L outdoor raceway pond, and the growth rate of reached(0.075±0.003)g·(L·d) after 10-day culture. The protein content of was approximately 60% and the removal efficiency of ammonium was 99%. This study provides an alternative method for the utilization of DPW.