本文選題：濕式氧化 + 含油廢水�。� 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：由于含油廢水中含有一些難生物降解的有機(jī)物,生物處理出水一般很難達(dá)到排放要求,需要進(jìn)行深度處理。高級(jí)氧化法是去除污水中難降解有機(jī)物的主要方法之一,因此在給水處理中已得到了廣泛的應(yīng)用。本文以含油廢水作為研究對(duì)象,采用濕式氧化法處理含油廢水,研究其降解反應(yīng)特性,為含油廢水處理提供指導(dǎo)�？疾炝藵袷窖趸に囂幚砗蛷U水中的主要操作條件,如反應(yīng)壓力、反應(yīng)溫度、反應(yīng)停留時(shí)間、氧化劑用量等對(duì)含油廢水處理效果的影響,在充足的氧化劑添加條件下,濕式氧化具有良好的處理效果,得到了最佳的反應(yīng)條件:反應(yīng)溫度305°C、壓力為14MPa、氧化劑用量200 mg/L、反應(yīng)停留時(shí)間為9 min,此時(shí)COD去除率為81.5%。催化濕式氧化工藝能在較溫和條件下提高處理的效果。論文研究發(fā)現(xiàn)甲醇、異丙醇、甲醛、乙醇、過渡金屬離子、堿催化劑對(duì)濕式氧化處理含油廢水具有很好的催化作用。研究結(jié)果表明,甲醛的添加有利于含油廢水COD的去除,當(dāng)甲醛質(zhì)量濃度增加到500mg/L時(shí),COD去除率達(dá)到最高值。金屬離子催化劑對(duì)濕式氧化含油廢水具有較好的催化活性。各種金屬鹽催化劑的催化活性由高到低的順序?yàn)?Fe(NO3)3Ni(NO3)2Mn(NO3)2。隨著反應(yīng)停留時(shí)間的延長,在Fe3+和Ni2+催化作用下,含油廢水的COD去除率提高。到反應(yīng)停留時(shí)間為9 min時(shí),Fe(NO3)3和Ni(NO3)2催化下的COD去除率分別為99.6%和96.3%。添加LiOH、Li2CO3和LiHCO3均有利于含油廢水COD的去除,添加LiOH比LiHCO3和Li2CO3處理效果更好;添加LiOH的最適宜濃度為200 mg/L,此時(shí)COD去除率達(dá)到最大值97.4%。為了更好的考察各個(gè)影響因素對(duì)含油廢水COD去除率之間的關(guān)系,采用Box-Behnken設(shè)計(jì),實(shí)驗(yàn)結(jié)果表明,反應(yīng)溫度、反應(yīng)停留時(shí)間、催化劑用量、氧化劑用量等對(duì)COD去除率的影響都比較大,溫度對(duì)COD去除率的影響最大。所得結(jié)果與單因素分析結(jié)果相同。最優(yōu)化條件為:反應(yīng)溫度288°C,反應(yīng)停留時(shí)間7 min、催化劑LiOH用量為133 mg/L、氧化劑用量188 mg/L,此時(shí)COD去除率99%。
[Abstract]:Because the oily wastewater contains some organic matter which is difficult to biodegrade, it is very difficult to meet the discharge requirement of the wastewater treated by biological treatment, so it is necessary to carry out advanced treatment. Advanced oxidation is one of the main methods to remove refractory organic compounds in wastewater, so it has been widely used in water treatment. In this paper, the oily wastewater was treated by wet air oxidation process, and its degradation reaction characteristics were studied, which provided guidance for the treatment of oily wastewater. The effects of main operating conditions, such as reaction pressure, reaction temperature, reaction residence time and oxidant dosage, on the treatment of oily wastewater by wet air oxidation process were investigated. The optimum reaction conditions were obtained as follows: reaction temperature 305 擄C, pressure 14 MPA, oxidant dosage 200 mg / L, residence time 9 min, COD removal rate 81.5%. Catalytic wet air oxidation process can improve the treatment effect under mild conditions. It is found that methanol, isopropanol, formaldehyde, ethanol, transition metal ions and alkali catalysts can catalyze the treatment of oily wastewater by wet air oxidation. The results showed that the addition of formaldehyde was beneficial to the removal of COD in oily wastewater. When the mass concentration of formaldehyde increased to 500 mg / L, the removal rate of COD reached the highest value. Metal ion catalyst has good catalytic activity for wet oxidation oily wastewater. The order of catalytic activity of various metal salt catalysts from high to low is: Feno _ 3N _ 3N _ 3N _ 3N _ 3O _ 3N _ 2MnNO _ 3H _ 2. With the prolongation of reaction residence time, the COD removal rate of oily wastewater increased under the catalysis of Fe _ 3 and Ni _ 2. When the residence time of the reaction was 9 min, the removal rates of FeN3CO3 and NiONO3K2 were 99.6% and 96.3wt% respectively. The addition of LiOHCO3 and LiHCO3 is beneficial to the removal of COD in oily wastewater, and LiOH is better than LiHCO3 and Li2CO3, and the optimum concentration of LiOH is 200 mg / L, and the COD removal rate reaches the maximum value of 97.4%. The Box-Behnken design was used to study the relationship between the COD removal rate of oily wastewater by various factors. The experimental results showed that the reaction temperature, reaction residence time, catalyst dosage, The amount of oxidant has a great influence on COD removal rate, while temperature has the biggest effect on COD removal rate. The result is the same as that of single factor analysis. The optimum conditions are as follows: reaction temperature 288 擄C, residence time 7 min, catalyst LiOH 133 mg / L, oxidant 188 mg / L, COD removal rate 99%.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X703
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本文編號(hào)：2000494