线路板油墨废水处理工艺优化研究
发布时间：2019-05-10 02:35
【摘要】：针对线路板高浓度有机油墨废水的处理,传统酸析/废水混合生物处理工艺普遍存在有机物去除效率低、出水可生化性差、硝化作用受抑、出水化学需氧量(COD)不达标等问题。随着线路板废水排放标准中总氮考核指标的进一步纳入,常用好氧生物处理法,如接触氧化法、序批式活性污泥法(SBR)等更使得低效脱氮问题日渐凸显。基于此,本文拟通过多级物化处理以增强油墨废水中有机物的去除率,提高其可生化性;同时,结合前置反硝化-曝气生物滤池(AAS-BAF)生物处理工艺,在实现油墨废水有机物达标排放的同时,提高其脱氮效果。多级物化处理基于先破乳后氧化的处理原则,通过考察对比不同工艺对油墨废水的处理效果,优选确定具体的破乳及氧化工艺。试验结果表明:酸析处理具有较好的破乳效果,在p H=3条件下,COD、色度和固体悬浮物(SS)的去除率分别达到69%、90%和100%,而混凝处理仅表现为对SS的去除。对于氧化处理工艺,微电解和Fenton工艺均有利于废水COD的去除和可生化性的提高,酸析处理废水经其处理后COD值可分别下降21%和24%,可生化性可由0.04分别提高至0.26和0.39。针对“酸析+微电解”和“酸析+Fenton”两种工艺处理后的废水进行生物处理试验,结合处理效果和经济性,确定最终处理工艺。试验结果表明,相比于仅采用酸析处理后的废水,“酸析+微电解”和“酸析+Fenton”两种处理工艺对反硝化脱氮无明显影响,但硝化效果均可明显提高,硝化速率可由4.54 mg/h分别提高到6.32 mg/h和7.66 mg/h。经济性分析表明,“酸析+微电解”处理费用为4.71元/吨水,远低于“酸析+Fenton”工艺的11.66元/吨水。根据上述结论,优选“酸析+微电解”作为油墨废水处理工艺。通过连续动态试验,考察了“酸析+微电解+AAS-BAF”工艺对油墨废水的处理效果,结果表明:在投加150 mg COD/L甲醇作为外加碳源的条件下,该工艺对COD、氨氮和TN均具有很好的去除效果,出水平均含量分别为55 mg/L、1.44 mg/L和12.82 mg/L,符合相应的排放标准。
[Abstract]:In view of the treatment of high concentration organic ink wastewater from circuit board, the organic matter removal efficiency is low, the effluent biodegradability is poor and nitrification is inhibited in the traditional mixed biological treatment process of acid precipitation / wastewater. The chemical oxygen demand of effluent (COD) is not up to standard and so on. With the further inclusion of total nitrogen assessment index in circuit board wastewater discharge standard, aerobic biological treatment methods, such as contact oxidation method, sequencing batch activated sludge process (SBR) and so on, make the problem of inefficient nitrogen removal more and more prominent. Based on this, this paper intends to enhance the removal rate of organic matter in ink wastewater and improve its biodegradability through multi-stage physicochemical treatment. At the same time, combined with pre-denitrification-biological aerated filter (AAS-BAF) biological treatment process, while achieving the standard discharge of organic matter in ink wastewater, the nitrogen removal efficiency was improved. The multi-stage physicochemical treatment is based on the principle of first demulsification and then oxidation. By comparing the effects of different processes on the treatment of ink wastewater, the specific demulsification and oxidation processes are optimized and determined. The experimental results show that the acid precipitation treatment has a good demulsification effect. Under the condition of pH 鈮，
本文编号：2473279
[Abstract]:In view of the treatment of high concentration organic ink wastewater from circuit board, the organic matter removal efficiency is low, the effluent biodegradability is poor and nitrification is inhibited in the traditional mixed biological treatment process of acid precipitation / wastewater. The chemical oxygen demand of effluent (COD) is not up to standard and so on. With the further inclusion of total nitrogen assessment index in circuit board wastewater discharge standard, aerobic biological treatment methods, such as contact oxidation method, sequencing batch activated sludge process (SBR) and so on, make the problem of inefficient nitrogen removal more and more prominent. Based on this, this paper intends to enhance the removal rate of organic matter in ink wastewater and improve its biodegradability through multi-stage physicochemical treatment. At the same time, combined with pre-denitrification-biological aerated filter (AAS-BAF) biological treatment process, while achieving the standard discharge of organic matter in ink wastewater, the nitrogen removal efficiency was improved. The multi-stage physicochemical treatment is based on the principle of first demulsification and then oxidation. By comparing the effects of different processes on the treatment of ink wastewater, the specific demulsification and oxidation processes are optimized and determined. The experimental results show that the acid precipitation treatment has a good demulsification effect. Under the condition of pH 鈮，
本文编号：2473279
本文链接：https://www.wllwen.com/kejilunwen/huanjinggongchenglunwen/2473279.html
最近更新
教材专著
