挂帘式生物滤池的填料筛选及硝化效率优化

Filler Selection and Nitrification Efficiency Optimization of A Novel Trickling Filter

循环水养殖在水产养殖中占有重要地位,水质净化是其核心技术。该文模拟循环水养殖系统,对3种滤布填料(碳纤维、涤纶无纺布、工业滤纸)构成的挂帘式生物滤池进行研究,通过比较3者的氨氮处理效果来筛选最佳滤布填料,并探究最适滤布填料在不同工况条件(流速、温度、初始氨氮浓度)下的最优处理效果。结果表明,碳纤维生物滤池挂膜速度快,生物量多且稳定,对氨氮和亚硝态氮有更好的去除效果;在30℃条件下,初始氨氮为10 mg/L,经过6 h反应,氨氮去除率可达97%;在一定范围内增大流速,会提高其氨氮的去除效率;初始氨氮浓度为15 mg/L时,氨氮平均去除速率达到0.5 mg/(L·h)。以上研究结果为挂帘式生物滤池在循环水养殖水质净化中的应用奠定了实验基础。

Recirculating aquaculture systems(RASs)play an important role in aquaculture,and water purification is the key technology for RASs.Three different commercial filter cloths(carbon fiber,non-woven polyester and industrial filter paper)were evaluated in lab-scale trickling filter.The nitrifying efficiencies with different conditions such as flow rate,temperature,and initial ammonia concentration were investigated.The biofilms of carbon fiber filter grew more quickly,and had better stability and nitrogen removal efficiency than the biofilms of other two filters did.At 30℃,with 10 mg/L of the initial ammonia concentration,the ammonia removal rate of filter with carbon fiber reached 97%after 6 h reaction.The efficiency of ammonia removal can be improved with the flow rate increasing within a certain range.The average ammonia removal rate of carbon fiber trickling filter increased to 0.5 mg/(L·h),while initial concentration of ammonia was 15 mg/L.