本文關(guān)鍵詞：Fenton氧化法處理DMF廢水及其技術(shù)優(yōu)化　出處：《華東理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： Fenton氧化 DMF廢水 非均相催化劑 過硫酸鹽熱活化 鐵泥回收

【摘要】：本文根據(jù)山東某化工公司的N,N-二甲基甲酰胺(DMF)廢水水質(zhì)配制模擬廢水,采用Fenton氧化法進(jìn)行處理,考察處理效果并優(yōu)化其反應(yīng)條件,探究廢水中陰離子對反應(yīng)的影響。同時(shí),針對Fenton氧化反應(yīng)中存在藥劑投加量大、pH范圍窄、鐵泥量大、陰離子影響大等四大問題,通過改變氧化劑種類、采用非均相催化劑、回用鐵泥等三種方式進(jìn)行改進(jìn)。采用Fenton氧化法處理1000mg/L的DMF廢水(COD=900mg/L),能夠保證出水COD100mg/L,滿足排放要求。通過正交試驗(yàn)得出四個(gè)主要因素的影響順序:H_20_2投加量n(H_2O_2):n(Fe~(2+))ph反應(yīng)時(shí)間:通過單因素實(shí)驗(yàn)得到Fenton氧化法處理DMF廢水的最佳反應(yīng)條件為:pH=2.0,n(H_20_2):n(Fe~(2+))=3:1,30%H2O2的投加量為40mL/L(即16.5gH_2O_2/g△COD),反應(yīng)時(shí)間為 2.5h。陰離子影響實(shí)驗(yàn)結(jié)果表明:Cl-對Fenton氧化法處理DMF廢水有著十分強(qiáng)的抑制作用,1g/L就會使出水COD由90mg/L上升到250mg/L,但其負(fù)面影響能夠通過增加雙氧水投加量的方式進(jìn)行消除,可以根據(jù)關(guān)系式30%H_2O_2(mL/L)=0.1451Cl-(mg/L)+27.876估算雙氧水的投加量,經(jīng)實(shí)際廢水驗(yàn)證該式可行:S0_4~2-對Fenton氧化反應(yīng)的處理效果影響十分小,甚至有著一定的促進(jìn)作用:低濃度時(shí)(S0_4~2-1g/L)出水COD基本保持不變,高濃度時(shí)(SO_4~210g/L)出水水質(zhì)反而有一定的提升,COD去除率提高。實(shí)際廢水中陰離子的存在使其處理成本增長為模擬廢水的3倍。采用過硫酸鹽熱活化法處理DMF廢水,可以在源頭上解決鐵泥和反應(yīng)pH的問題。結(jié)果表明,該法能夠很好地降解DMF,其最佳反應(yīng)條件為:S_20_8~2-投加量=17g/L,反應(yīng)溫度=70℃,反應(yīng)初始pH任選(選用原水pH即可),反應(yīng)時(shí)間3h,在該條件下能夠保證出水COD100mg/L,達(dá)標(biāo)排放。該體系對于Cl-的耐受程度較之Fenton氧化體系擴(kuò)大了 100倍,且處理的藥劑成本可降低至Fenton氧化體系的三分之一。采用離子交換樹脂、活性炭、玻璃珠、分子篩和石英砂等五種材料來制備含鐵非均相催化劑,并應(yīng)用于Fenton氧化法處理DMF廢水,研究表明這五種材料均不適用:離子交換樹脂在處理過程中,樹脂本身會被降解;活性炭對DMF廢水有一定的處理效果,但存在出水色度高、反應(yīng)速度慢、載體成本高的問題;玻璃珠、分子篩和石英砂對于DMF廢水處理基本沒有作用。通過酸溶還原法(硫酸酸溶+鐵粉還原)能夠?qū)崿F(xiàn)鐵泥的回用,回用兩次后依舊能夠保證出水達(dá)標(biāo),其鐵泥排放量能夠減少60%。經(jīng)過單因素實(shí)驗(yàn)可以得到,該體系的最佳酸溶初始pH=1.5,酸溶后的鐵泥需經(jīng)過過濾排泥步驟才進(jìn)入回用階段,其最佳鐵粉投加量為0.75g/L。經(jīng)回用后,成本可降低至原有體系的二分之一。
[Abstract]:According to the water quality of NN- dimethylformamide (DMF) wastewater from a chemical company in Shandong province, the simulated wastewater was treated by Fenton oxidation method. The treatment effect was investigated and the reaction conditions were optimized. To explore the influence of anions in wastewater on the reaction, at the same time, there are four problems in the oxidation of Fenton, such as the narrow range of pH, the large amount of iron sludge and the great influence of anions on the oxidation of Fenton. By changing the types of oxidants, heterogeneous catalysts are used. The treatment of 1000mg / L DMF wastewater by Fenton oxidation method was improved by using iron sludge. Can ensure effluent COD100mg/L. Emission requirements. The order of influence of four main factors is obtained by orthogonal test. Ph reaction time: through single factor experiment, the optimum reaction conditions of Fenton oxidation process for treating DMF wastewater were obtained as follows: 1. 0 pH ~ (2. 0). The amount of H _ 2O _ 2 / L was 40 mL / L (16.5g / g / g / g / COD). The reaction time was 2.5 h. The results showed that the reaction time was 2.5 h. The results showed that the Fenton oxidation process had a strong inhibitory effect on the treatment of DMF wastewater. One g / L would increase the output COD from 90 mg / L to 250 mg / L, but the negative effects could be eliminated by increasing the amount of hydrogen peroxide added. The dosage of hydrogen peroxide can be estimated from the formula 30: 2mL / L 0.1451Cl-mg / L) 27.876. It is proved that this formula is feasible by the actual wastewater. It has little effect on the treatment effect of Fenton oxidation reaction. Even has the certain promotion function: when the concentration is low, the COD of S0s _ 0 / L _ (42-1g / L) effluent remains basically unchanged. At high concentration, the effluent quality of so _ 4 / L _ 210g / L has improved to a certain extent. The removal rate of COD was improved, and the treatment cost of DMF wastewater was increased by three times as much as that of simulated wastewater by the existence of anions in actual wastewater. DMF wastewater was treated by persulfate thermal activation method. The results show that DMF can be well degraded by this method, and the optimum reaction condition is as follows: 1. Ss 2082- dosage of 17g / L. The reaction temperature is 70 鈩，

本文編號：1390716