電化學(xué)法處理垃圾滲瀝液反滲透濃縮液的實驗研究
發(fā)布時間：2018-09-19 16:32
【摘要】：城市垃圾在衛(wèi)生填埋過程中會產(chǎn)生高含鹽難生物降解的有機廢水——垃圾滲瀝液。隨著垃圾滲瀝液處理技術(shù)的發(fā)展,膜分離技術(shù)在一定程度上解決了垃圾滲瀝液處理難題,但膜分離同時產(chǎn)生了一定數(shù)量的更難處理的具有超高含鹽、高色度、高濃度特點的難降解廢水——膜截留濃縮廢液。電化學(xué)氧化法作為一種有效去除難降解有機物的高級氧化處理技術(shù),具有環(huán)境兼容性和友好性的特點。近年來,電化學(xué)氧化法不僅引起了人們的廣泛關(guān)注,而且已在垃圾滲瀝液、制藥廢水、制革廢水、印染廢水、煉油廢水等領(lǐng)域開展相關(guān)研究工作。本研究利用電化學(xué)氧化技術(shù)進行垃圾滲瀝液反滲透截留濃縮液處理實驗研究,處理對象取自青島小澗西滲瀝液處理有限公司MBR處理出水經(jīng)DTRO系統(tǒng)截留的濃縮液。通過實驗研究確定了適宜的電極極板材料與電解工藝統(tǒng)計及運行參數(shù),具體研究內(nèi)容與研究結(jié)果如下:(1)利用電絮凝和聚鐵絮凝技術(shù)對濃縮液預(yù)處理實驗的結(jié)果表明,利用聚鐵對濃縮液進行絮凝比電絮凝更有優(yōu)勢,當(dāng)聚鐵的投加量為12.5g/L時,CODcr去除率達到52.82%。(2)電化學(xué)氧化電極材料選擇實驗研究結(jié)果表明,選擇合適的電極材料不僅可以提高效率而且是實驗成功的關(guān)鍵因素。電化學(xué)氧化實驗結(jié)果表明,電極材料對電化學(xué)氧化處理效果影響較大,各種電極材料的電解處理效果由好到差分別為TPB電極、二氧化釕電極、二氧化銥電極、金屬氧化物改性活性炭電極、氧化錫銻橡膠電極。因此,本研究選用TPB電極作為后續(xù)實驗的對象。(3)利用板式電解裝置對絮凝預(yù)處理后濃縮液的正交試驗結(jié)果表明,各影響因素主次關(guān)系為占空比電壓頻率p H。其最優(yōu)水平的組合方式為電壓10V、頻率3000Hz、占空比15%、p H=7。在最優(yōu)條件下,其CODcr的去除率為76%。(4)利用同軸電解裝置對濃縮液原液的單因素試驗實驗結(jié)果表明,在最佳工藝組合條件下(脈沖電壓為15V,占空比為15%,頻率為2000Hz,流量為5m3/h),電解反應(yīng)歷時6h時電解效果達到最佳,CODcr去除率達到82.96%。(5)同軸與板式電解裝置的對比實驗結(jié)果表明,同軸與板式系統(tǒng)相比在反應(yīng)歷時2h、4h、6h、8h、10h條件下,其CODcr去除率分別提高了46.2%、26.93%、14.07%、8.73%、5.60%。在達到相同的電解效果的前提下,板式系統(tǒng)裝置需要反應(yīng)歷時12h,而同軸系統(tǒng)裝置僅需要反應(yīng)歷時6h。因此,同軸系統(tǒng)裝置比板式系統(tǒng)具有優(yōu)勢。(6)在電化學(xué)氧化過程中NH4+-N的去除率達到96.89%。色度的去除率達到99.00%。
[Abstract]:In the process of sanitary landfill, municipal solid waste (MSW) will produce organic wastewater with high salt content, which is difficult to biodegrade-landfill leachate. With the development of landfill leachate treatment technology, membrane separation technology has solved the problem of landfill leachate treatment to a certain extent, but membrane separation has produced a certain number of more difficult to deal with the high salt, high color, High concentration of refractory wastewater-membrane interception of concentrated waste liquid. Electrochemical oxidation, as an advanced oxidation technology for removing refractory organic compounds, has the characteristics of environmental compatibility and friendliness. In recent years, electrochemical oxidation has not only attracted widespread attention, but also has carried out related research work in the fields of leachate, pharmaceutical wastewater, tannery wastewater, printing and dyeing wastewater, refinery wastewater and so on. In this study, the treatment of landfill leachate by reverse osmosis retention concentrate was studied by electrochemical oxidation technology. The treatment object was collected from the effluent of MBR treated by DTRO system in Qingdao small Jianxi leachate treatment Co., Ltd. The suitable electrode plate material and electrolysis process statistics and operation parameters were determined through experimental research. The specific research contents and results are as follows: (1) the pretreatment experiment of concentrated liquid by electroflocculation and polyferric flocculation technology shows that; Flocculation of concentrated liquid by polyferric is more advantageous than electrocoagulation. When the dosage of polyiron is 12.5g/L, the removal rate of CODcr reaches 52.82%. (2) the experimental results of electrode material selection for electrochemical oxidation show that: (1) when the dosage of polyiron is 12.5g/L, the removal rate of CODcr can reach 52.82%. The selection of appropriate electrode materials can not only improve the efficiency but also is the key factor for the success of the experiment. The results of electrochemical oxidation experiment show that the electrode material has a great effect on the electrochemical oxidation treatment. The electrolysis treatment efficiency of various electrode materials is TPB electrode, ruthenium oxide electrode, iridium oxide electrode, etc. Metal oxide modified activated carbon electrode, tin oxide antimony rubber electrode. Therefore, the TPB electrode was selected as the object of the following experiment. (3) the orthogonal test results of the concentrated solution after flocculation pretreatment with plate electrolysis device showed that the main and secondary relationship of each factor was the duty cycle voltage frequency (pH). The optimal combination mode is voltage 10V, frequency 3000Hz, duty cycle 15pH 7. Under the optimum conditions, the removal rate of CODcr is 76%. (4) the single factor experiment results of coaxial electrolysis on the concentrated solution show that, Under the optimum process combination conditions (pulse voltage 15V, duty cycle 15, frequency 2000Hz, flow rate 5m3/h), the electrolysis effect reached the best removal rate of 82.96 when the electrolysis reaction lasted 6 h. (5) the comparison experiment results of coaxial and plate electrolysis device show that, Compared with the plate system, the removal rate of CODcr in the coaxial system was increased by 46.2and 26.93and 14.07, respectively, under the reaction duration of 2 h ~ 4 h ~ 6 h ~ (6 h) and 8 h ~ 8 h ~ (10 h). On the premise of the same electrolysis effect, the plate system needs 12 h reaction time, while the coaxial system only needs 6 h reaction time. Therefore, the coaxial system has an advantage over the plate system. (6) the removal rate of NH4-N in electrochemical oxidation process is 96.89. The removal rate of chromaticity reached 99.00.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703.1
本文編號：2250695
[Abstract]:In the process of sanitary landfill, municipal solid waste (MSW) will produce organic wastewater with high salt content, which is difficult to biodegrade-landfill leachate. With the development of landfill leachate treatment technology, membrane separation technology has solved the problem of landfill leachate treatment to a certain extent, but membrane separation has produced a certain number of more difficult to deal with the high salt, high color, High concentration of refractory wastewater-membrane interception of concentrated waste liquid. Electrochemical oxidation, as an advanced oxidation technology for removing refractory organic compounds, has the characteristics of environmental compatibility and friendliness. In recent years, electrochemical oxidation has not only attracted widespread attention, but also has carried out related research work in the fields of leachate, pharmaceutical wastewater, tannery wastewater, printing and dyeing wastewater, refinery wastewater and so on. In this study, the treatment of landfill leachate by reverse osmosis retention concentrate was studied by electrochemical oxidation technology. The treatment object was collected from the effluent of MBR treated by DTRO system in Qingdao small Jianxi leachate treatment Co., Ltd. The suitable electrode plate material and electrolysis process statistics and operation parameters were determined through experimental research. The specific research contents and results are as follows: (1) the pretreatment experiment of concentrated liquid by electroflocculation and polyferric flocculation technology shows that; Flocculation of concentrated liquid by polyferric is more advantageous than electrocoagulation. When the dosage of polyiron is 12.5g/L, the removal rate of CODcr reaches 52.82%. (2) the experimental results of electrode material selection for electrochemical oxidation show that: (1) when the dosage of polyiron is 12.5g/L, the removal rate of CODcr can reach 52.82%. The selection of appropriate electrode materials can not only improve the efficiency but also is the key factor for the success of the experiment. The results of electrochemical oxidation experiment show that the electrode material has a great effect on the electrochemical oxidation treatment. The electrolysis treatment efficiency of various electrode materials is TPB electrode, ruthenium oxide electrode, iridium oxide electrode, etc. Metal oxide modified activated carbon electrode, tin oxide antimony rubber electrode. Therefore, the TPB electrode was selected as the object of the following experiment. (3) the orthogonal test results of the concentrated solution after flocculation pretreatment with plate electrolysis device showed that the main and secondary relationship of each factor was the duty cycle voltage frequency (pH). The optimal combination mode is voltage 10V, frequency 3000Hz, duty cycle 15pH 7. Under the optimum conditions, the removal rate of CODcr is 76%. (4) the single factor experiment results of coaxial electrolysis on the concentrated solution show that, Under the optimum process combination conditions (pulse voltage 15V, duty cycle 15, frequency 2000Hz, flow rate 5m3/h), the electrolysis effect reached the best removal rate of 82.96 when the electrolysis reaction lasted 6 h. (5) the comparison experiment results of coaxial and plate electrolysis device show that, Compared with the plate system, the removal rate of CODcr in the coaxial system was increased by 46.2and 26.93and 14.07, respectively, under the reaction duration of 2 h ~ 4 h ~ 6 h ~ (6 h) and 8 h ~ 8 h ~ (10 h). On the premise of the same electrolysis effect, the plate system needs 12 h reaction time, while the coaxial system only needs 6 h reaction time. Therefore, the coaxial system has an advantage over the plate system. (6) the removal rate of NH4-N in electrochemical oxidation process is 96.89. The removal rate of chromaticity reached 99.00.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703.1
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