电絮凝-CANON工艺处理石油裂化催化剂生产废水试验研究

发布时间：2018-04-13 16:17

  本文选题：石油裂化催化剂废水 + 电絮凝　； 参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：石油化工掌握着国家的经济命脉,与我们的日常生活息息相关。石油裂化催化剂生产过程中产生大量高氨氮、高悬浮物废水,目前应用的废水处理工艺存在曝气能耗高、药剂消耗大、运行成本过高、基建费用高及营养物质(N素)去除效率低等问题,如何对废水进行高效的预处理和脱氮是石化企业亟需解决的难题。试验研究新型电絮凝-CANON组合工艺处理石油裂化催化剂废水,考察电絮凝对废水预处理的最佳运行参数;以厌氧氨氧化膨胀颗粒污泥床(expanded-granular sludge bed,EGSB)为载体,研究CANON工艺的启动参数及电絮凝-CANON组合工艺的运行效能;模拟污水处理厂四季温度的变化对反应器处理效能的影响,并对组合工艺与水厂目前的处理工艺进行经济效益对比分析。结果表明,电絮凝具有处理效率高,抗击原水水质的波动的优点,能减轻后续生化处理单元的负荷。通过单因素和正交试验确定电絮凝处理石油裂化催化剂生产废水的最优运行参数:p H9.0,极板间距1.5cm,电流密度25m A/cm2,电解时间25min;在最佳的运行参数下,电絮凝预处理出水水质高,浊度和COD去除率分别在97%和30%以上;电絮凝主要运行成本为铝阳极损耗,占总运行成本(约1.88元/m3)的59.57%。EGSB厌氧氨氧化反应器由厌氧条件转为微氧状态,通过添加硝化污泥来启动CANON工艺。通过控制反应器的运行参数:温度T(30±0.5)℃,DO(0.5±0.05)mg/L,p H 7.5~8.2,经过40d的短暂运行,成功启动CANON工艺。TN去除率最高达到62%,TN去除负荷最高达到0.189kg N/(m3?d)。利用电絮凝-CANON组合工艺处理石油裂化催化剂生产废水,COD平均去除率为60.03%,TN平均去除率为67.30%,TN平均去除负荷为0.07kg N?m-3?d-1,出水COD100mg/L,NH4+-N10mg/L。模拟污水处理厂四季温度的变化,研究不同温度条件下(28,30,33℃)组合工艺的运行效果,结果表明:在不同的温度条件下,组合工艺的出水水质均能满足石化企业的排放标准;与28℃、30℃相比,33℃条件下,CANON工艺的脱氮效率最高,氨氮去除负荷均值至0.14kg N/(m3?d),总氮去除负荷最高至0.15kg N/(m3?d),均值为0.12kg N/(m3?d),TN去除率均值为67.6%。工程经济性分析表明:电絮凝-CANON工艺与某石化公司目前应用的处理工艺相比,在基建费用及运行成本具有很大的优势。可减少占地面积1740m3,节省工程造价约64.67%,节省374.03万元/年的运行费,是比较有前景的处理工艺。
[Abstract]:Petrochemical industry holds the national economic lifeline and is closely related to our daily life.A large amount of wastewater containing high ammonia nitrogen and high suspended solids is produced in the production of petroleum cracking catalyst. The wastewater treatment process used at present has high energy consumption of aeration, large consumption of chemicals and high operating cost.The problems of high cost of capital construction and low removal efficiency of nutrient N) make it an urgent problem for petrochemical enterprises to pretreat and denitrify wastewater efficiently.The treatment of petroleum cracking catalyst wastewater by a new type of electroflocculation-CANON combination process was studied, and the optimum operating parameters of electroflocculation on the pretreatment of wastewater were investigated, and the anaerobic ammonia oxidation granular sludge bed expanded-granular sludge bedded EGSBs was used as the carrier.The start-up parameters of CANON process and the operation efficiency of electroflocculation-CANON combination process were studied, and the effects of four seasons temperature change on the reactor treatment efficiency were simulated.The economic benefits of the combined process and the current treatment process of the water plant are compared and analyzed.The results show that electroflocculation has the advantages of high treatment efficiency, resisting the fluctuation of raw water quality, and can reduce the load of subsequent biochemical treatment unit.Through single factor and orthogonal test, the optimum operating parameters of electroflocculation for treating wastewater from petroleum cracking catalyst production were determined: 1: pH9.0, 1.5 cm between polar plates, 25mA / cm2 current density and 25min electrolysis time. Under the optimum operating parameters, the effluent quality of electroflocculation pretreatment was high.The removal rates of turbidity and COD were above 97% and 30%, respectively, and the main operating cost of electroflocculation was aluminum anode loss, which accounted for 1.88 yuan / m ~ (3) of the total operating cost of 59.57%.EGSB anaerobic ammonia oxidation reactor, which changed from anaerobic condition to micro-oxygen state.The CANON process was initiated by adding nitrified sludge.The operating parameters of the reactor were controlled as follows: temperature T _ (30 卤0.5) 鈩，

本文编号：1745254