洗涤法净化油烟污染物

摘要

模拟油烟废气由泥浆和活性污泥2种洗涤液分别进行洗涤试验研究.结果表明,洗涤液中泥浆和活性污泥的质量浓度愈高,其初始洗涤效率越高.在ρ(泥浆)和ρ(活性污泥)为1.2 g/L,烟气流量为2.8 m3/h,油加热温度为160℃,洗涤液量为20 L条件下,运行15 d,泥浆的平均去除率为67.4%,油烟粒子粒径由0.2～75 μm变为0.2～42 μm,其液相油烟饱和浓度达95.77 mg/L;而活性污泥平均去除率为83.9%,油烟粒子粒径由0.2～75 μm变为0.2～5.5 μm,其液相油烟饱和浓度为50.00mg/L.从活性污泥洗涤液中筛选出4株优势菌种,它们对油烟的降解效率大于60%,表明活性污泥洗涤液的洗涤效率明显高于泥浆,是由于活性污泥中微生物对油烟污染物具有显著降解作用.%A simulated cooking fume was washed by slurry and activated sludge. The results showed that the washing liquid with higher concentrations of slurry and activated sludge gave a higher washing effect. When the concentrations of both slurry and activated sludge were 1.2 g/L,the flow of cooking fumes was 2. 8 m3/h, the waste oil heated temperature was 160 ℃, and the washing liquid volume was 20 L,67.4％ of the pollutants from the cooking fume were removed by the slurry after a 15 day run. The size of the aerosols were reduced from 0. 2- 75 μm to 0. 2- 42 μm, and the saturation concentration of aqueous pollutants of the cooking fumes reach 95.77 mg/L in the slurry. However,83.9％ of the pollutants from the cooking fume were washed off by the activated sludge, the size of the aerosols were reduced from 0.2-75 μm to 0. 2-5.5 μm, and the saturation concentration of aqueous pollutants of cooking fumes was reduced 50.00 mg/L in the activated sludge. Furthermore,four dominant strains were screened out from the washing liquid of the activated sludge, the biodegradation rate of which reached more than 60％ on cooking fume pollutants. This indicated that a higher washing effect of activated sludge on cooking fumes than slurry can be attributed to the excellent biodegradability of microorganisms in the activated sludge.