高级氧化联合磷酸铵镁沉淀法预处理垃圾渗滤液的研究
发布时间：2018-12-16 22:26
【摘要】：随着我国经济迅速发展,城市的规模不断增大,城市生活垃圾总量不断增长。垃圾填埋的处理方式由于处理量大、操作方便和运行费用较低等特点在我国被大多数城市所采用。然而填埋的处理方式会带来大量的渗滤液,其主要特点是污染成分复杂、浓度高且含有大量的重金属离子。这种污水无法直接使用生化法处理。因此,将渗滤液预处理以达到生化法处理的水质标准显得非常重要。在这个背景下,本文研究了高级氧化法(高锰酸钾、次氯酸钠和Fenton试剂)、磷酸铵镁化学沉淀法以及两种方法的联合方法预处理垃圾渗滤液,以找到一种有效、经济的方法是渗滤液达到可生物处理的水平。主要研究内容包括以下几个方面:(1)氧化剂氧化法。选用高锰酸钾、次氯酸钠和Fenton试剂三种氧化剂氧化处理渗滤液,其中高锰酸钾最佳反应条件:投加量为15ml/L,pH值为6.0,最佳时间为80min,此时渗滤液中污染物质的最大去除率:色度68.09%,PO_4~(3-)99.98%,NH~(~(4+))17.93%,CODCr 53.39%;次氯酸钠的最佳反应条件:投加量为40ml/L,pH值为8.0,反应时间为60min,此时渗滤液中污染物质的最大去除率:色度54.73%,PO_4~(3-)99.97%,NH~(~(4+))38.07%,CODCr 60.51%;Fenton试剂最佳反应条件:氯化亚铁投加量为4g/L,pH值为3.0,反应时间为100min,此时渗滤液中污染物质的最大去除率:色度85.95%,PO_4~(3-)99.98%,NH~(~(4+))6.75%,CODCr63.87%。在反应动力学的研究中,高锰酸钾作为氧化剂时,去除CODCr的反应为三级反应动力模型;次氯酸钠为氧化剂时,去除CODCr的反应为三级反应动力模型;Fenton试剂作为氧化剂时,去除CODCr的反应为三级反应动力模型。(2)磷酸铵镁化学沉淀法。磷酸铵镁化学沉淀法可以有效的预处理垃圾渗滤液的NH~(~(4+))-N,且出水中的PO_4~(3-)-P含量较低,其最佳反应条件为:pH值为9.5,反应温度为20℃,[Mg~(2+)]/[NH~(~(4+))]/[PO_4~(3-)]的摩尔比1.2:1:1.4,反应时间为15min,静置时间为20 min。在此条件下,渗滤液中的污染物质的最大去除率:NH~(~(4+))98.87%,CODCr 45.59%。反应后溶液中残留的PO_4~(3-)浓度64.43mg/L。在反应动力学研究中,去除氨氮的反应为一级反应动力模型。(3)氧化联合磷酸铵镁法。选用高锰酸钾+磷酸铵镁、次氯酸钠+磷酸铵镁和Fenton试剂+磷酸铵镁三种组和方法处理垃圾渗滤液,其中试验最佳去除率分别为:高锰酸钾+磷酸铵镁:色度85.79%,PO_4~(3-)47.20%,氨氮96.08%,CODCr81.82%;次氯酸钠+磷酸铵镁:色度81.63%,PO_4~(3-)61.49%,氨氮95.56%,CODCr 82.67%;Fenton试剂+磷酸铵镁:色度93.95%,PO_4~(3-)70.80%,氨氮96.36%,CODCr 89.12%。在高锰酸钾+磷酸铵镁、次氯酸钠+磷酸铵镁和Fenton试剂+磷酸铵镁三种组和方法中,其中Fenton试剂+磷酸铵镁这个联合预处理方法在色度、PO_4~(3-)、氨氮和CODCr的去除方面,效果均达到最佳。
[Abstract]:With the rapid economic development of our country, the scale of the city is increasing, and the total amount of municipal solid waste is increasing. The landfill treatment is adopted in most cities in China because of its large amount of disposal, convenient operation and low operating cost. However, landfill treatment will bring a large number of leachate, the main characteristics of the pollution is complex, high concentration and contains a large number of heavy metal ions. This kind of sewage can not be treated directly by biochemical method. Therefore, it is very important to pretreat leachate to meet the water quality standard of biochemical treatment. Under this background, the advanced oxidation method (potassium permanganate, sodium hypochlorite and Fenton reagent), ammonium magnesium phosphate chemical precipitation method and the combined method of two methods were studied to pretreat landfill leachate in order to find an effective method. The economic approach is to reach a biotreatable level of leachate. The main contents are as follows: (1) Oxidant oxidation method. Potassium permanganate, sodium hypochlorite and Fenton reagent were used to oxidize the leachate. The optimum reaction conditions of potassium permanganate were as follows: the dosage of potassium permanganate was 6.0ml / L, and the optimum time was 80 min. At this time, the maximum removal rate of pollutants in leachate was as follows: the chroma 68.09% PO4- 99.98 and NH ~ (4) 17.93 ~ 3 as well as CODCr 53.39; The optimum reaction conditions of sodium hypochlorite were as follows: the dosage of sodium hypochlorite was 40 ml / L (pH = 8.0), the reaction time was 60 min, and the maximum removal rate of pollutants in leachate was 54.73% and 99.97% respectively. NH~ (4) 38.07; The optimum reaction conditions of Fenton reagent were as follows: the dosage of ferrous chloride was 4.0 g / L ~ (-1) pH, the reaction time was 100 min, and the maximum removal rate of pollutants in leachate was 85.95 ~ (3-) 99.98%. NH~ (4) 6.75m about COD Cr 63.87. In the study of reaction kinetics, when potassium permanganate is used as oxidant, the removal of CODCr is a third-order kinetic model, and the removal of CODCr by sodium hypochlorite as oxidant is a third-order kinetic model. When Fenton reagent is used as oxidant, the reaction of removing CODCr is a third-order kinetic model. (2) the chemical precipitation method of magnesium ammonium phosphate. The NH~ (4) -N of landfill leachate can be pretreated effectively by the chemical precipitation method of ammonium magnesium phosphate, and the content of PO_4~ (3-) -P in the effluent is lower. The optimum reaction conditions are as follows: pH value is 9.5, reaction temperature is 20 鈩，
本文编号：2383143
[Abstract]:With the rapid economic development of our country, the scale of the city is increasing, and the total amount of municipal solid waste is increasing. The landfill treatment is adopted in most cities in China because of its large amount of disposal, convenient operation and low operating cost. However, landfill treatment will bring a large number of leachate, the main characteristics of the pollution is complex, high concentration and contains a large number of heavy metal ions. This kind of sewage can not be treated directly by biochemical method. Therefore, it is very important to pretreat leachate to meet the water quality standard of biochemical treatment. Under this background, the advanced oxidation method (potassium permanganate, sodium hypochlorite and Fenton reagent), ammonium magnesium phosphate chemical precipitation method and the combined method of two methods were studied to pretreat landfill leachate in order to find an effective method. The economic approach is to reach a biotreatable level of leachate. The main contents are as follows: (1) Oxidant oxidation method. Potassium permanganate, sodium hypochlorite and Fenton reagent were used to oxidize the leachate. The optimum reaction conditions of potassium permanganate were as follows: the dosage of potassium permanganate was 6.0ml / L, and the optimum time was 80 min. At this time, the maximum removal rate of pollutants in leachate was as follows: the chroma 68.09% PO4- 99.98 and NH ~ (4) 17.93 ~ 3 as well as CODCr 53.39; The optimum reaction conditions of sodium hypochlorite were as follows: the dosage of sodium hypochlorite was 40 ml / L (pH = 8.0), the reaction time was 60 min, and the maximum removal rate of pollutants in leachate was 54.73% and 99.97% respectively. NH~ (4) 38.07; The optimum reaction conditions of Fenton reagent were as follows: the dosage of ferrous chloride was 4.0 g / L ~ (-1) pH, the reaction time was 100 min, and the maximum removal rate of pollutants in leachate was 85.95 ~ (3-) 99.98%. NH~ (4) 6.75m about COD Cr 63.87. In the study of reaction kinetics, when potassium permanganate is used as oxidant, the removal of CODCr is a third-order kinetic model, and the removal of CODCr by sodium hypochlorite as oxidant is a third-order kinetic model. When Fenton reagent is used as oxidant, the reaction of removing CODCr is a third-order kinetic model. (2) the chemical precipitation method of magnesium ammonium phosphate. The NH~ (4) -N of landfill leachate can be pretreated effectively by the chemical precipitation method of ammonium magnesium phosphate, and the content of PO_4~ (3-) -P in the effluent is lower. The optimum reaction conditions are as follows: pH value is 9.5, reaction temperature is 20 鈩，
本文编号：2383143
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