加热与酸化与芬顿试剂对乳化液处理效果的研究

Study on Treatment of Emulsion Wastewater by Heating,Acidification and Fenton Oxidation

乳化液废水含有大量表面活性剂,化学性质稳定,给处理带来很大难度。为解决乳化液处理困难的问题,我们以某电子制造商产生的乳化液废水为研究对象,采取加热酸化-Fenton氧化开展处理研究,意在解决实际工程中乳化液废水处理困难的问题,同时为乳化液废水处理在技术上提供新的思路。在加热酸化-Fenton氧化处理中,由于乳化液稳定性极好,传统酸化破乳效果不理想,将加热用于酸化破乳,油水分离效果明显,在加酸量1.0 mL 98%H2SO4/100mL乳化液、加热温度95℃、加热时间1h条件下,加热酸化破乳使初始COD>20万mg/L,浊度>8000 NTU的乳化液废水COD降到46592mg/L,浊度降到20 NTU以下,COD和浊度的去除率分别达90.7%和97.5%以上;由于破乳后的废水仍具有很高的COD浓度,因此采取Fenton氧化进一步处理,在ρFe2+/ρH2O2=1∶30、ρH2O2/ρCOD=1.4、初始pH=4的条件下,经处理后的出水COD可降到18600 mg/L,去除率达61.4%,其B/C可由破乳后的0.11提高到0.3,废水的可生化性大大提高,为后续进一步处理提供可能。

Emulsion contains a lot of surface active agent which have stable chemical properties,so it is very difficult to treatment.in order to solve this problem,this paper studied the emulsion wastewater from a electronic manufacturer in Sichuan.Trough heating,acidification and fenton oxidation process,try to look for an applicable method in the actual engineering,and provide new ideas for the treatment of emulsion wastewater.In the Heating-acidification-Fenton oxidation process,emulsion is very stable,so the traditional acidification is not ideal.But add heating process while acidification,the efficiency of oil-water separation is obvious.Under the condition of heating time one hour,heating temperature 95℃ and H2SO4 （98％） dosage 1.0mL in 100mL emulsion,the emulsion with an initial COD over 200000mg/L and turbidity over 8000 NTU was reduced to 46592mg/L COD and 20 NTU turbidity,the removal rate of COD and turbidity was 90.7％ and 97.5％ respectively.Because of the effluent still has high COD concentration,Fenton oxidation is used for further treatment.Under the condition of the initial pH is 4,ρFe2＋/ρH2O2 =1∶ 30、ρH2O2/ρCOD =1.4,the COD of the effluent reduced to 18600mg/L and the removal rate reached 61.4％.In addition,the B/C of wastewater increased from 0.11 to 0.3 after Fenton oxidation,which makes it possible for further treatment.