多级冷冻法处理含油废水

Treatment of Oily Wastewater by Multistage Freezing Process

采用多级冷冻法处理含油废水。实验结果表明:在初始废水中COD和ρ(NH3-N)分别为36 400 mg/L和73 mg/L的条件下,经过8级冷冻处理,COD和ρ(NH3-N)分别降至430 mg/L和2 mg/L,去除率分别可达98.82%和97.72%;在相同COD的条件下,ρ(NH3-N)较高时,COD去除率较高,由此可见无机盐离子(如NH4+)的存在有利于有机物的去除。

Oily wastewater was treated by the multistage freezing process. The experimental results show that： Under the conditions of initial COD 36 400 mg/L, initial ρ（NH3-N） 73 mg/L and 8 stages of freezing, the COD and p（NH3-N） of the wastewater are decreased to 430 mg/L and 2 mg/L with 98.82% and 97.72% of removal rate respectively; The COD removal rate is higher when the COD is the same and the ρ（NH3-N） is higher, which indicates that the presence of inorganic ions（such as NH4＋） is favorable to remove organic compounds.