共聚醚合成過程廢水的處理研究
發(fā)布時間：2018-08-01 11:14
【摘要】：共聚醚合成過程中會產(chǎn)生COD值大、難降解有機物含量多、水質(zhì)水量多變的有機廢水。Fenton法是一種常用的處理有機廢水的高級氧化技術(shù),但僅采用Fenton法難以對共聚醚廢水進行達標(biāo)處理。本研究采用微電解-Fenton法、UV-Fenton法、Fenton-混凝法以及微電解-UV/Fenton-混凝法四種Fenton組合工藝處理共聚醚廢水,以COD去除率和色度值為指標(biāo),確定各方法的較佳工藝條件。得出了對共聚醚廢水處理效果較好的組合工藝及其較佳的實驗條件。采用微電解-Fenton法處理共聚醚廢水,對30%H_2O_2投加量、初始pH值、反應(yīng)時間、鐵粉投加量和鐵炭比進行了考察,得到較佳的實驗條件為:30%H_2O_2投加量為40m L/L,初始pH值為1,反應(yīng)時間4h,鐵粉投加量為40g/L,鐵炭比為1:4。該條件下處理后的共聚醚廢水COD去除率達到93.6%,色度值僅為2.6度。采用UV-Fenton法處理共聚醚廢水,對初始pH值、反應(yīng)時間、FeSO_4·7H_2O投加量和n(H_2O_2)/n(Fe~(2+))進行了考察,得到較佳的實驗條件:初始pH值為2,反應(yīng)時間2.5h,FeSO_4·7H_2O投加量為18g/L,n(H_2O_2)/n(Fe~(2+))為40:1。在該條件下處理后的共聚醚廢水COD去除率達到76.2%,色度值為13.1度。采用Fenton-混凝法處理共聚醚廢水,對混凝劑種類、FeSO_4·7H_2O投加量、n(H_2O_2)/n(Fe~(2+))、FeCl_3投加量和PAM投加量進行了考察,得到較佳的實驗條件:混凝劑為FeCl_3,FeSO_4·7H_2O投加量為24g/L,n(H_2O_2)/n(Fe~(2+))為27:1,FeCl_3投加量為5g/L,PAM投加量為600mg/L。在該條件下處理共聚醚廢水,廢水的COD去除率可達到58.7%,色度值僅為2.4度。采用微電解-UV/Fenton-混凝法對共聚醚廢水進行處理,對UV/Fenton階段pH值、FeSO_4·7H_2O投加量、30%H_2O_2投加量、FeCl_3投加量、PAM投加量五個主要的影響因素進行了考察,得到該組合方法的較佳實驗條件為:UV/Fenton階段pH值為2、30%H_2O_2投加量420m L/L、混凝劑PAM投加量為200mg/L、不需添加FeSO_4·7H_2O和FeCl_3。在較佳條件下處理后的共聚醚廢水COD去除率達到98.5%,色度值為6.4度。從對共聚醚廢水的處理效果來看,四種組合工藝中微電解-UV/Fenton-混凝法處理效果最好,經(jīng)其處理過的共聚醚廢水的COD值從33415 mg/L降低到500mg/L,滿足《污水綜合排放標(biāo)準(zhǔn)》(GB8976-1996)三級排放標(biāo)準(zhǔn),色度值達到一級排放標(biāo)準(zhǔn)。微電解-Fenton法、UV-Fenton法、Fenton-混凝法對共聚醚廢水均有一定的處理效果,可作為對共聚醚廢水的預(yù)處理方法使用,其中微電解-Fenton法對于廢水中的有機物去除率較高,COD去除率高達90%�；炷�-Fenton法處理后的廢水色度值相對較低,可用于處理色度值高,懸浮物、細小顆�；蛘吣z體含量高的共聚醚廢水。
[Abstract]:In the process of synthesis of copolyether, the COD value is large, the content of refractory organic matter is high, and the organic wastewater with variable water quality and quantity is a common advanced oxidation technology for treating organic wastewater. However, it is difficult to treat polyether wastewater by Fenton process only. In this study, four kinds of Fenton combined processes of micro-electrolysis and Fenton-Fenton method and micro-electrolysis / UV / Fenton-coagulation process were used to treat the copolyether wastewater. The removal rate of COD and the value of chroma were taken as the index to determine the better process conditions of each method. The better combination process and the better experimental conditions for the treatment of co-polyether wastewater were obtained. The copolyether wastewater was treated by micro-electrolysis-Fenton process. The dosage of 30%H_2O_2, initial pH value, reaction time, the amount of iron powder and the ratio of iron to carbon were investigated. The results show that the optimum experimental conditions are as follows: (1) the volume of S _ 2O _ 2 is 40 mL / L, the initial pH is 1, the reaction time is 4 h, the dosage of iron powder is 40 g / L, and the ratio of iron to carbon is 1: 4. Under this condition, the COD removal rate of the treated copolyether wastewater reached 93.6 degrees and the chroma value was only 2.6 degrees. The copolyether wastewater was treated by UV-Fenton method. The initial pH value, the reaction time and the dosage of FeSO4 7H_2O and n (H_2O_2) / n (Fe2) were investigated. The optimum experimental conditions were as follows: initial pH value 2, reaction time 2.5hFeSO4 7H_2O dosage 18g / Ln (H_2O_2) / n (Fe2) = 40: 1. The COD removal rate of the treated copolyether wastewater was 76. 2% and the chroma value was 13. 1 degree. The Fenton-Coagulation method was used to treat copolyether wastewater. The dosage of coagulant FeSO4 7H_2O (H_2O_2) n (Fe2) + FeCl3 and the dosage of PAM were investigated. The optimum experimental conditions were obtained as follows: the dosage of coagulant FeClon 3 FeSO4 7H_2O was 24 g LLN (H_2O_2) n (Fe2) 27: 1 FeCl3 was 5 g / L PAM = 600mgL / L. The experimental conditions were as follows: the dosage of coagulant FeSO4 7H_2O was 24g / L (H_2O_2) n (Fe2) = 27: 1FeCl3 = 5 g / L PAM = 600mgL / L. Under this condition, the COD removal rate of the wastewater can reach 58.7 degrees, and the chroma value is only 2.4 degrees. The copolyether wastewater was treated by micro-electrolysis / UV / Fenton-coagulation method. Five main influencing factors were investigated on the pH value of FeSO4 7H_2O at UV/Fenton stage and the dosage of FeSO4 7H_2O. The optimum experimental conditions of the combined method are as follows: the pH value of the phase of 20 / UV / Fenton is 230 / 20 / L, the dosage of PAM is 200 mg / L, and the addition of FeSO_4 7H_2O and FeCl _ 3 is not necessary. The COD removal rate of the treated copolyether wastewater was 98.5 and the chroma value was 6.4 degrees under the optimum conditions. According to the treatment effect of co-polyether wastewater, the treatment effect of micro-electrolysis UV / Fenton-coagulation process is the best. The COD value of the treated copolyether wastewater is reduced from 33415 mg/L to 500mg / L, which meets the tertiary discharge standard of "sewage Comprehensive discharge Standard" (GB8976-1996). The chroma value is up to the first class emission standard. Micro-electrolysis-Fenton UV-Fenton-coagulation process can treat copolyether wastewater to some extent and can be used as a pretreatment method for co-polyether wastewater, in which micro-electrolysis Fenton-Fenton process has a higher removal rate of organic matter and COD removal rate is as high as 90%. Coagulation-Fenton process can be used to treat the wastewater with high chromaticity value, suspended matter, fine particles or high colloid content of co-polyether wastewater.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：X783
本文編號：2157391
[Abstract]:In the process of synthesis of copolyether, the COD value is large, the content of refractory organic matter is high, and the organic wastewater with variable water quality and quantity is a common advanced oxidation technology for treating organic wastewater. However, it is difficult to treat polyether wastewater by Fenton process only. In this study, four kinds of Fenton combined processes of micro-electrolysis and Fenton-Fenton method and micro-electrolysis / UV / Fenton-coagulation process were used to treat the copolyether wastewater. The removal rate of COD and the value of chroma were taken as the index to determine the better process conditions of each method. The better combination process and the better experimental conditions for the treatment of co-polyether wastewater were obtained. The copolyether wastewater was treated by micro-electrolysis-Fenton process. The dosage of 30%H_2O_2, initial pH value, reaction time, the amount of iron powder and the ratio of iron to carbon were investigated. The results show that the optimum experimental conditions are as follows: (1) the volume of S _ 2O _ 2 is 40 mL / L, the initial pH is 1, the reaction time is 4 h, the dosage of iron powder is 40 g / L, and the ratio of iron to carbon is 1: 4. Under this condition, the COD removal rate of the treated copolyether wastewater reached 93.6 degrees and the chroma value was only 2.6 degrees. The copolyether wastewater was treated by UV-Fenton method. The initial pH value, the reaction time and the dosage of FeSO4 7H_2O and n (H_2O_2) / n (Fe2) were investigated. The optimum experimental conditions were as follows: initial pH value 2, reaction time 2.5hFeSO4 7H_2O dosage 18g / Ln (H_2O_2) / n (Fe2) = 40: 1. The COD removal rate of the treated copolyether wastewater was 76. 2% and the chroma value was 13. 1 degree. The Fenton-Coagulation method was used to treat copolyether wastewater. The dosage of coagulant FeSO4 7H_2O (H_2O_2) n (Fe2) + FeCl3 and the dosage of PAM were investigated. The optimum experimental conditions were obtained as follows: the dosage of coagulant FeClon 3 FeSO4 7H_2O was 24 g LLN (H_2O_2) n (Fe2) 27: 1 FeCl3 was 5 g / L PAM = 600mgL / L. The experimental conditions were as follows: the dosage of coagulant FeSO4 7H_2O was 24g / L (H_2O_2) n (Fe2) = 27: 1FeCl3 = 5 g / L PAM = 600mgL / L. Under this condition, the COD removal rate of the wastewater can reach 58.7 degrees, and the chroma value is only 2.4 degrees. The copolyether wastewater was treated by micro-electrolysis / UV / Fenton-coagulation method. Five main influencing factors were investigated on the pH value of FeSO4 7H_2O at UV/Fenton stage and the dosage of FeSO4 7H_2O. The optimum experimental conditions of the combined method are as follows: the pH value of the phase of 20 / UV / Fenton is 230 / 20 / L, the dosage of PAM is 200 mg / L, and the addition of FeSO_4 7H_2O and FeCl _ 3 is not necessary. The COD removal rate of the treated copolyether wastewater was 98.5 and the chroma value was 6.4 degrees under the optimum conditions. According to the treatment effect of co-polyether wastewater, the treatment effect of micro-electrolysis UV / Fenton-coagulation process is the best. The COD value of the treated copolyether wastewater is reduced from 33415 mg/L to 500mg / L, which meets the tertiary discharge standard of "sewage Comprehensive discharge Standard" (GB8976-1996). The chroma value is up to the first class emission standard. Micro-electrolysis-Fenton UV-Fenton-coagulation process can treat copolyether wastewater to some extent and can be used as a pretreatment method for co-polyether wastewater, in which micro-electrolysis Fenton-Fenton process has a higher removal rate of organic matter and COD removal rate is as high as 90%. Coagulation-Fenton process can be used to treat the wastewater with high chromaticity value, suspended matter, fine particles or high colloid content of co-polyether wastewater.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：X783
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