Fenton-NaClO法联用深度处理造纸废水实验研究

发布时间：2018-12-16 05:30

【摘要】：造纸废水主要为高浓度的有机废水,其特点是排放量大、污染负荷高、成分复杂、毒性大,对环境造成严重的污染,同时也直接威胁着人类健康。造纸废水经絮凝沉淀和生化处理后,水质虽然得到了改善,但一些污染物的指标依然偏高,所以需要对其进行深度处理才可以直接排放。传统的深度处理都存在一定的不足,而高级氧化技术处理造纸废水的实用性已被前人的研究成果证实。本文分别采用Fenton法与NaClO法深度处理造纸废水,确定最佳运行条件,并以对CODcr和色度的去除率为评价标准,比较Fenton法与NaClO法处理造纸废水的优缺点。在此基础上,联合Fenton法和NaClO法对废水进行深度处理,改变两种方法处理废水的先后顺序,确定最佳处理顺序和技术方案。实验研究结果表明：次氯酸钠在添加量为10ml/L、pH值为9、反应时间为60min时处理效果最佳,对COD的去除率为47.9%,色度去除率为77.8%。芬顿试剂当FeSO4投加量为7.5m1/L时,H202投加量为1ml/L、pH值为4、氧化时间为50min时效果最佳,对COD的去除率为54.4%,色度去除率为74.4%。NaClO-Fenton法联用深度处理造纸废水,经NaClO法预处理后,再利用芬顿试剂处理。在最优条件下,对COD的去除率为67.9%,COD值为61.9mg/L对色度的去除率为93.3%。Fenton-NaClO法联用深度处理造纸废水,经Fenton试剂预处理后,再利用NaClO法处理。在最优条件下,对色度的去除率为91.3%,对COD的去除率为71.5%,COD值为54.2 mg/L。因Fenton-NaClO法联用深度处理造纸废水达到海河流域水污染物综合排放标准的一级标准,最终选用Fenton-NaClO法联用为最优技术方案。
[Abstract]:Papermaking wastewater is mainly high concentration organic wastewater, which is characterized by large discharge, high pollution load, complex composition, high toxicity, serious pollution to the environment, and also a direct threat to human health. After flocculation sedimentation and biochemical treatment the water quality of papermaking wastewater is improved but the indexes of some pollutants are still on the high side so it is necessary to carry out advanced treatment in order to discharge directly. There are some shortcomings in the traditional advanced treatment, but the practicability of advanced oxidation technology for papermaking wastewater treatment has been confirmed by previous research results. In this paper, Fenton and NaClO were used to treat papermaking wastewater, and the optimal operating conditions were determined. The removal rate of CODcr and chromaticity was taken as the evaluation standard to compare the advantages and disadvantages of Fenton and NaClO in the treatment of papermaking wastewater. On this basis, combined with Fenton and NaClO to carry on the advanced treatment of the wastewater, change the order of the two methods to treat the wastewater, determine the best treatment sequence and technical scheme. The experimental results show that the best treatment effect is when the amount of sodium hypochlorite is 10 ml / L ~ (-1) pH value is 9, the reaction time is 60min, the removal rate of COD is 47.9% and the chromaticity removal rate is 77.8%. When the dosage of FeSO4 is 7.5m1/L, the pH value of H202 is 4 and the oxidation time is 50min. The removal rate of COD is 54.4%. The chrominance removal rate is 74.4%.NaClO-Fenton process combined with advanced treatment of papermaking wastewater. After pretreatment with NaClO method, Fenton reagent is used to treat paper making wastewater. Under the optimum conditions, the removal rate of COD is 67.9%. The removal rate of 61.9mg/L on chroma is that of 93.3%.Fenton-NaClO combined with advanced treatment of papermaking wastewater. After pretreatment with Fenton reagent, NaClO method is used to treat the wastewater. Under the optimum conditions, the removal rate of chromaticity is 91.3, the removal rate of COD is 71.5 mg/L., and the value of COD is 54.2 mg/L.. Because the advanced treatment of papermaking wastewater by Fenton-NaClO method meets the first class standard of comprehensive discharge standard of water pollutants in Haihe River basin, the best technical scheme is the combination of Fenton-NaClO method.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X793

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