生物强化移动床生物膜反应器处理水产养殖循环水初步研究

利用自制的硝化细菌菌剂促进移动床生物膜反应器(Moving bed biofilm reactor,MBBR)的挂膜启动,分析不同载体氨氮负荷、碳氮比条件下反应器运行状况,并进一步进行了实验室模拟循环水养殖草金鱼实验。结果显示,利用自制硝化菌剂能够完成整个移动床反应器的启动过程,在接种15 d后使循环出水氨氮稳定在1 mg/L以下。单位体积载体氨氮负荷实验表明,MBBR能够在100 mg TAN/(L填料·d)条件下,使出水满足一般水产养殖水质要求(氨氮0.5 mg/L,亚硝氮0.1 mg/L)。进水碳氮比在1以内时MBBR能够稳定高效运行。在实验室模拟循环水养殖过程中,经菌剂强化的MBBR能维持循环出水氨氮低于0.5 mg/L,亚硝氮低于0.05 mg/L。

Application of bioaugmentation with nitrifying bacteria in the rapid start-up of moving bed biofilm reactor in recirculating aquaculture system

Nitrifying bacteria, which are responsible for oxidation of ammonia to nitrate , play an essential role in biofilter of recirculating aquaculture system (RAS).To accelerate the start-up of moving bed biofilm reactor (MBBR) in RAS, bioaugmentation was adopted with the addition of mixed nitrifying bacteria .As a result, the inoculated MBBR was success -fully started after 15 days and the NH4 +-N concentrations of effluents maintained below 1 mg/L.Then at volumetric total ammonia nitrogen(TAN) load rates of 100 g TAN/(L media-d), TAN and nitrite nitrogen concentrations in effluents of MBBR maintained below 0.5 and 0.1 mg/L, respectively.At C/N ratios raging from 0 to 1, the MBBR showed stable and efficient daily performances for RAS .In lab-scale RAS experiment, the MBBR in Carassius auratus RAS was started up within 20 days and the NH4+-N and NO2--N concentrations of effluents were below 0.5 and 0.05 mg/L, respectively.