三级生物膜工艺处理水产养殖循环水

采用三级生物膜工艺处理水产养殖循环水,并对该工艺去除模拟水产养殖循环水主要污染物的作用进行了研究.结果表明:在进水pH为7.5～8.5,温度为28～32 ℃,ρ（DO）为0.5～1.0 　mg/L,ρ（FA）为5～10 　mg/L时,水产养殖循环水的COD_Cr,NH₄+-N和TN的平均去除率分别为94.4%,91.6%和70.1%,ρ（NO₂--N）平均值小于5.2 　mg/L.说明三级生物膜工艺可用于低ρ（C）/ρ（N）比水产养殖循环水的生物处理,尤其可消除NO₂--N对水产养殖动物的潜在威胁,并达到养鱼回用标准. 

Treatment of Aquaculture Recirculating Water by Tri Stage Biofilm Process

Tri-stage biofilm processing was used to treat aquaculture recirculating water.The removal performance and mechanism of major contaminants in the water were investigated.Under proper operating conditions （pH=7.5-8.5,T=28-32　℃,ρ（DO）=0.5-1.0 　mg/L and ρ（FA）=5-10 　mg/L）,the removal efficiencies of COD_Cr,NH₄+-N and TN were 94.4%,91.6% and 70.1% respectively,and the average of ρ（NO₂--N） in the effluent was less than 5.2 　mg/L.This indicates that tri-stage biofilm processing can be applicable for the biotreatment of aquaculture recirculating water with low ratio of ρ（C）/ρ（N）,to satisfy the standard of recycled water for fishing and eliminate the potential threat of NO₂--N to aquaculture animals.