三级生物膜工艺处理水产养殖循环水

Treatment of Aquaculture Recirculating Water by Tri-Stage Biofilm Process

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0.5～1.0mg/L,ρ(FA)为5～10mg/L时,水产养殖循环水的CODCr,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5.2mg/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.

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℃ ,p（DO） = 0. 5-1.0 mg/L and p（FA） = 5-10 mg/L） , the removal efficiencies of CODcr, NH4^＋ -N and TN were 94.4% ,91.6% and 70. 1% respectively, and the average of p（ 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 p（C）/ρ（N） ,to satisfy the standard of recycled water for fishing and eliminate the potential threat of NO2^- -N to aquaculture animals.