零价铁法处理竹木制浆造纸漂白废水的研究

发布时间：2018-01-07 13:44

  本文关键词：零价铁法处理竹木制浆造纸漂白废水的研究　出处：《广西大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 竹木制浆造纸 漂白废水 AOX 零价铁

【摘要】：采用传统含氯漂白剂漂白技术的制浆造纸企业产生的漂白废水具有成分复杂、有毒、处理难度大等特点,是制浆造纸企业外排废水的主要来源。为了探索一种经济高效的漂白废水处理技术,使其车间或生产设施废水排放口排放的漂白废水满足GB3544-2008《制浆造纸工业水污染物排放标准》的要求,本文以广西某制浆造纸厂的漂白车间废水为研究对象,采用实验室烧杯实验方法,应用单独零价铁法、强化零价铁法、Fe0-H2O2联用法处理漂白废水,考察其对AOX和COD的去除效果,并分析反应机理,探索优化工艺条件。得出的主要结论如下：单独零价铁处理漂白废水时,AOX的降解去除是氢解反应和铁的混凝作用共同作用的结果,Fe2+还原脱氯反应的能力有限；COD的降解去除主要依赖于体系内氢解反应进行的程度。pH对AOX和COD的去除效果是最主要的影响因素,pH值随反应时间的延长而增大,维持反应体系的pH值在3-4时,pH值呈现快速增长。最佳实验条件：零价铁投加量约为l00g/L、初始pH=3.0、反应时间为4h,AOX和COD去除率分别可达65.3%和53.6%。最佳强化零价铁法为维持反应体系的pH值在3-4、调节反应终pH=10,该强化方法在零价铁投加量为100g/L、初始pH=3.0、反应时间为3h的情况下,最佳AOX去除率可达77.6%。AOX的去除率与反应终pH线性关系方程式：Y=2.029*X+48.51,R2=0.9983。Fe0-H2O2联用法能较大地提高漂白废水中AOX和COD的去除效率,体系内Fe2+的浓度是影响AOX降解去除的重要因素,Fe0-H2O2联用法扩宽了传统Fenton法的pH适用范围。最合适实验条件：零价铁投加量约为100g/L、初始pH=3.0、反应时间2hFe0+1hH2O2后调节反应终pH=10.0, AOX的去除率可达87.5%。采用单独零价铁法、强化零价铁法和Fe0-H2O2联用法处理漂白车间废水,单独零价铁法的效果最差,Fe0-H2O2联用法效果最好。在实现达标排放的前提下,最大AOX处理能力分别为：单独零价铁法,一般地区≤38mg/L,需要采取特别保护措施的地区≤25mg/L；强化零价铁法：一般地区≤64mg/L,需要采取特别保护措施的地区≤43mg/L; Fe0-H2O2联用法一般地区≤122mg/L,需要采取特别保护措施的地区≤81mg/L。
[Abstract]:Bleaching wastewater produced by pulp and paper mill with traditional bleaching technology containing chlorine bleach has the characteristics of complex composition, toxic and difficult to treat. In order to explore an economical and efficient bleaching wastewater treatment technology, it is the main source of effluent from pulping and papermaking enterprises. The bleach wastewater discharged from the waste water discharge port of its workshop or production facility can meet the requirements of GB3544-2008 "discharge Standard of Water pollutants in Pulp and Papermaking Industry". In this paper, the bleaching wastewater of a pulp and paper mill in Guangxi was studied. The method of laboratory beaker experiment was used to treat bleaching wastewater by using single zero-valent iron method and strengthening the combined use of zero-valent iron method and Fe0-H _ 2O _ 2. The removal efficiency of AOX and COD was investigated, the reaction mechanism was analyzed, and the optimum process conditions were explored. The main conclusions were as follows: the treatment of bleaching wastewater by single zero-valent iron. The degradation and removal of AOX is the result of the combined effect of the hydrogenolysis reaction and the coagulation of iron. The ability of Fe2 reduction dechlorination is limited. The degradation and removal of COD mainly depends on the degree of hydrogenolysis in the system. The removal effect of pH on AOX and COD is the most important factor. The pH value increases with the increase of reaction time. The pH value of the system increases rapidly when the pH value of the system is 3-4. The optimum experimental conditions are as follows: the dosage of zero valent iron is about 10 g / L, the initial pH value is 3.0, and the reaction time is 4 h. The removal rates of AOX and COD were 65.3% and 53.6, respectively. The best strengthening zero-valent iron method was to maintain the pH value of the reaction system between 3 and 4 and to regulate the final reaction pH=10. This method can be used under the conditions of zero valent iron dosage of 100 g / L, initial pH value of 3.0 and reaction time of 3 h. The optimal removal rate of AOX can reach 77.6%. The linear relationship between the removal rate and the final pH of the reaction is 1: y 2. 029 X 48.51. The removal efficiency of AOX and COD in bleaching wastewater can be greatly improved by using R2 + 0.9983. Fe0-H _ 2O _ 2. The concentration of Fe2 in the system is an important factor affecting the degradation and removal of AOX. The optimal experimental conditions are as follows: the dosage of zero valent iron is about 100g / L and the initial pH=3.0 is about 100 g / L. The removal rate of AOX can reach 87.5% after adjusting the final pH of H _ 2O _ 2 for 2 h Fe _ (0.1) h with Fe _ (2) O _ (2) H _ (2) O _ 2. In the treatment of bleaching workshop wastewater by strengthening zero-valent iron method and Fe0-H2O2 combined use, the effect of single zero-valent iron process is the worst and the effect of Fe0-H _ 2O _ 2 combination is the best. The maximum AOX processing capacity is: single zero-valent iron method, general area 鈮，

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