Fenton-流化床處理制革廢水的試驗研究
發(fā)布時間：2018-11-23 07:04
【摘要】：作為主要工業(yè)污染源之一,制革廢水通常具有污染物濃度高及難生物降解的特點,僅僅通過生化處理已難以滿足愈發(fā)嚴(yán)格的排放標(biāo)準(zhǔn)要求,因此亟需開發(fā)出制革廢水深度處理的新工藝。本文以某皮革廠制革廢水為研究對象,針對該廠污水站生化處理部分原有氧化溝前新增A/O工藝后出水仍不達標(biāo)的問題,決定通過Fenton反應(yīng)對生化出水進行深度處理。首先通過小試試驗對比傳統(tǒng)Fenton和Fenton-流化床的處理效果,利用正交試驗考察廢水初始p H值、雙氧水投加量、硫酸亞鐵與過氧化氫摩爾濃度比(即硫酸亞鐵投加量)及反應(yīng)時間對COD去除率的影響程度,再經(jīng)過單因素試驗確定最佳反應(yīng)條件。傳統(tǒng)Fenton的正交試驗結(jié)果表明,各因素對COD去除率的影響程度依次為:[Fe2+]/[H2O2](摩爾濃度比)p HH2O2投加量反應(yīng)時間;單因素試驗結(jié)果確表明最佳反應(yīng)條件為:初始p H值3,30%雙氧水投加量0.8m L/L,[Fe2+]/[H2O2]=0.8,攪拌反應(yīng)時間20min,曝氣時間30min,絮凝沉淀部分PAM(0.1%)投加量2m L/L,此時出水COD為49.9mg/L,COD去除率為59.8%。Fenton-流化床的正交試驗結(jié)果表明各因素對COD去除率的影響程度依次為:H2O2投加量p H反應(yīng)時間[Fe2+]/[H2O2](摩爾濃度比);單因素試驗結(jié)果表明最佳反應(yīng)條件為:鐵氧化物負載石英砂填充率10%(140g/L),初始p H值3,30%雙氧水投加量0.8m L/L,[Fe2+]/[H2O2]=0.1(Fe SO4·7H2O投加量0.22g/L),反應(yīng)時間60min,曝氣時間30min,絮凝沉淀部分PAM(0.1%)投加量2m L/L,此時出水COD為43.7mg/L,去除率為64.8%。對比兩種工藝可看出在相同工藝條件下,雙氧水投加量均為0.8m L/L時,Fenton-流化床比傳統(tǒng)Fenton的COD去除率高5%,Fe SO4·7H2O投加量減少了87.5%,鐵泥產(chǎn)率降低了64.0%。綜上可知Fenton-流化床工藝深度處理制革廢水的效果優(yōu)于傳統(tǒng)Fenton工藝,并且為進一步驗證Fenton-流化床在工程中的實際應(yīng)用效果,在小試階段確定最佳加藥量基礎(chǔ)上,擴大至中試,以驗證試驗在工程上應(yīng)用的效果并繼續(xù)探索最佳加藥量。此外,本研究也對污水站生化處理部分新建A/O工藝及深度處理部分Fenton-流化床的運行效果進行了簡要的分析,并探討了新建A/O對原有氧化溝的影響。
[Abstract]:As one of the main industrial pollution sources, tannery wastewater is usually characterized by high concentration of pollutants and difficult to biodegrade. It is difficult to meet the more stringent emission standards by biochemical treatment alone. Therefore, it is urgent to develop a new process for advanced treatment of tannery wastewater. In this paper, a tannery wastewater was studied. Aiming at the problem that the effluent was still not up to the standard after adding A / O process before the original oxidation ditch at the wastewater treatment station of this plant, it was decided to carry out advanced treatment of the biochemical effluent through Fenton reaction. Firstly, the initial pH value of wastewater and the dosage of hydrogen peroxide were investigated by orthogonal test compared with the conventional Fenton and Fenton- fluidized bed. The molar ratio of ferrous sulfate to hydrogen peroxide (that is, the dosage of ferrous sulfate) and the reaction time affect the removal rate of COD. The optimum reaction conditions were determined by single factor test. The orthogonal test results of traditional Fenton show that the degree of influence of each factor on COD removal efficiency is as follows: [Fe2] / [H2O2] (molar concentration ratio) p HH2O2 dosage reaction time; The results of single factor test show that the optimum reaction conditions are as follows: initial pH value of 30% hydrogen peroxide is 0.8 mL / L, [Fe2] / [H2O2] = 0.8, stirring time 20 min, aeration time 30 min. The dosage of PAM (0.1%) is 2m L / L, and the effluent COD is 49.9 mg / L, The orthogonal experiment of COD removal rate of 59.8% 路Fenton-Fluidized bed showed that the degree of influence of various factors on COD removal efficiency was as follows: H2O2 dosage pH reaction time [Fe2] / [H2O2] (molar concentration ratio); The results of single factor test show that the optimum reaction conditions are as follows: the filling ratio of ferric oxide loaded quartz sand is 10% (140g/L), the initial pH value is 3 ~ (30)% hydrogen peroxide, the dosage of hydrogen peroxide is 0.8 mL / L, [Fe2] / [H2O2] = 0.1 (Fe SO4 7H2O dosage 0.22g/L), reaction time 60 min, aeration time 30 min, flocculation sedimentation part PAM (0.1%) dosage 2m L / L, and effluent COD 43.7 mg / L, The removal rate was 64.8%. By comparing the two processes, it can be seen that under the same conditions, when the dosage of hydrogen peroxide is 0.8ml / L, the COD removal rate of Fenton- fluidized bed is 5% higher than that of traditional Fenton, and the dosage of Fe SO4 7H2O decreases by 87.5%. The yield of iron sludge decreased by 64.0%. It is concluded that the effect of advanced treatment of tannery wastewater by Fenton- fluidized bed process is superior to that of traditional Fenton process, and in order to further verify the practical application effect of Fenton- fluidized bed in engineering, the optimal dosage is determined in the small trial stage and expanded to the pilot test. In order to verify the application of the test in engineering and continue to explore the optimal dosage. In addition, the operation effect of the new A / O process and the Fenton- fluidized bed for advanced treatment were analyzed briefly, and the influence of the new A / O on the original oxidation ditch was discussed.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X794
本文編號：2350717
[Abstract]:As one of the main industrial pollution sources, tannery wastewater is usually characterized by high concentration of pollutants and difficult to biodegrade. It is difficult to meet the more stringent emission standards by biochemical treatment alone. Therefore, it is urgent to develop a new process for advanced treatment of tannery wastewater. In this paper, a tannery wastewater was studied. Aiming at the problem that the effluent was still not up to the standard after adding A / O process before the original oxidation ditch at the wastewater treatment station of this plant, it was decided to carry out advanced treatment of the biochemical effluent through Fenton reaction. Firstly, the initial pH value of wastewater and the dosage of hydrogen peroxide were investigated by orthogonal test compared with the conventional Fenton and Fenton- fluidized bed. The molar ratio of ferrous sulfate to hydrogen peroxide (that is, the dosage of ferrous sulfate) and the reaction time affect the removal rate of COD. The optimum reaction conditions were determined by single factor test. The orthogonal test results of traditional Fenton show that the degree of influence of each factor on COD removal efficiency is as follows: [Fe2] / [H2O2] (molar concentration ratio) p HH2O2 dosage reaction time; The results of single factor test show that the optimum reaction conditions are as follows: initial pH value of 30% hydrogen peroxide is 0.8 mL / L, [Fe2] / [H2O2] = 0.8, stirring time 20 min, aeration time 30 min. The dosage of PAM (0.1%) is 2m L / L, and the effluent COD is 49.9 mg / L, The orthogonal experiment of COD removal rate of 59.8% 路Fenton-Fluidized bed showed that the degree of influence of various factors on COD removal efficiency was as follows: H2O2 dosage pH reaction time [Fe2] / [H2O2] (molar concentration ratio); The results of single factor test show that the optimum reaction conditions are as follows: the filling ratio of ferric oxide loaded quartz sand is 10% (140g/L), the initial pH value is 3 ~ (30)% hydrogen peroxide, the dosage of hydrogen peroxide is 0.8 mL / L, [Fe2] / [H2O2] = 0.1 (Fe SO4 7H2O dosage 0.22g/L), reaction time 60 min, aeration time 30 min, flocculation sedimentation part PAM (0.1%) dosage 2m L / L, and effluent COD 43.7 mg / L, The removal rate was 64.8%. By comparing the two processes, it can be seen that under the same conditions, when the dosage of hydrogen peroxide is 0.8ml / L, the COD removal rate of Fenton- fluidized bed is 5% higher than that of traditional Fenton, and the dosage of Fe SO4 7H2O decreases by 87.5%. The yield of iron sludge decreased by 64.0%. It is concluded that the effect of advanced treatment of tannery wastewater by Fenton- fluidized bed process is superior to that of traditional Fenton process, and in order to further verify the practical application effect of Fenton- fluidized bed in engineering, the optimal dosage is determined in the small trial stage and expanded to the pilot test. In order to verify the application of the test in engineering and continue to explore the optimal dosage. In addition, the operation effect of the new A / O process and the Fenton- fluidized bed for advanced treatment were analyzed briefly, and the influence of the new A / O on the original oxidation ditch was discussed.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X794
【參考文獻】
相關(guān)期刊論文 前1條
1 謝銀德,陳鋒,何建軍,趙進才;Photo-Fenton反應(yīng)研究進展[J];感光科學(xué)與光化學(xué);2000年04期
，本文編號：2350717
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