微絮凝砂滤工艺处理石化二级出水的研究

发布时间：2018-03-22 21:41

本文选题：石化二级出水　切入点：微絮凝砂滤工艺　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：石油化工废水具有排放量大、组分复杂、难去除等特点,是工业废水处理领域的研究热点。经过常规生物处理的石化二级出水往往还含有大量难去除的有机物质,随着水质排放标准的逐步提高,需要对二级出水进行深度处理。本研究采用微絮凝砂滤工艺对石化二级出水进行了深度处理的试验研究,主要研究结论如下:烧杯试验中,采用PAC作为投加剂,较佳参数条件为:搅拌时间6min、投加量为30mg/L,COD、TP的平均去除率分别为28.95%、60.15%,干污泥产量为0.028g/L,絮体粒径可成长至117.02μm,Zeta电位值为-0.887mV;采用PAFC作为投加剂试验较佳参数条件为:搅拌时间6min、投加量为30mg/L,COD、TP的平均去除率分别为30.15%、63.18%,干污泥产量为0.0204g/L,絮体粒径可成长至87.32μm,Zeta电位值为-0.485m V。微絮凝砂滤工艺中试试验,以PAC作为絮凝剂,投加量为30mg/L时,COD、TP、浊度去除率分别为33.28%、81.11%、86.02%。以PAFC为絮凝剂,投加量为30mg/L时,COD、TP、浊度去除率分别为34.27%、85.05%、87.78%。以PAC为投加絮凝剂改变滤速、气水比优化出最终的最佳参数组合为:进水流量为500L/h,即滤速为7m/h,投加量为30mg/L,气量为16.5L/m2.s,气水比为3:1。对最佳运行参数条件下微絮凝砂滤工艺处理前后水样的有机物分子量分布研究得出:微絮凝砂滤工艺优先处理对象主要是大于3K大分子有机物;对三维荧光特性变化研究表明:该工艺不能有效去除或削减类芳香族蛋白质有机物、类溶解性微生物代谢产物、腐植酸;对特征有机物的变化情况测定得出:该工艺对石化污水二级出水主要存在的不饱和烃、苯系物、酮、酯等特征有机物均难以有效去除。处理量为6500t/h,则所消耗的能源动力成本为0.04206元/吨。投加量为30mg/L时,PAC、PAFC处理成本这算成污水处理成本分别为0.05786元/吨、0.06286元/吨。
[Abstract]:Petrochemical wastewater, with the characteristics of large discharge, complex components and difficult to remove, is a research hotspot in the field of industrial wastewater treatment. The secondary effluent of petrochemical industry after conventional biological treatment often contains a large number of organic substances which are difficult to remove. With the improvement of water quality standard, advanced treatment of secondary effluent is needed. In this study, advanced treatment of secondary effluent of petrochemical industry was carried out by micro-flocculation sand filtration process. The main conclusions are as follows: in beaker test, Using PAC as additive, The optimum parameters are as follows: stirring time is 6 min, the average removal rate of 30 mg / L CODTP is 28.95g / L 60.15, the dry sludge yield is 0.028 g / L, the particle size of flocs can grow to -0.887mV, and the best parameter condition of using PAFC as adding agent is as follows: when mixing, the optimum parameters are as follows: when mixing, the sludge yield is 0.028 g / L, and the particle size can grow to 117.02 渭 m Zeta potential value of -0.887mV. In 6 min, the average removal rate of 30 mg / L CODN TP was 30.15 ~ 63.18, the dry sludge yield was 0.0204 g / L, and the particle size of the flocs could grow to -0.485m V with the Zeta potential of 87.32 渭 m 路m ~ (-1) 路min ~ (-1). When PAC was used as flocculant, the turbidity removal rate of 30mg/L was 33.2881.11 and 86.02, respectively. When PAFC was used as flocculant and 30mg/L was added, the turbidity removal rate was 34.27 ~ 85.05 and 87.78 respectively. The filtration rate was changed by adding PAC as flocculant. The optimal parameters are as follows: the influent flow rate is 500L / h, that is, the filtration rate is 7m / h, the dosage is 30mg / L, the gas volume is 16.5 L / m ~ 2 路s, and the gas-water ratio is 3: 1.The organic content of water sample before and after the treatment of micro-flocculation sand filtration process under the optimal operating parameters is obtained. The results show that the priority of micro-flocculation sand filtration process is more than 3K macromolecular organic matter. The results showed that the process could not effectively remove or reduce the aromatic protein-like organic compounds, soluble microbial metabolites, and humic acid. It is concluded that the main unsaturated hydrocarbons, benzenes and ketones in the secondary effluent of petrochemical wastewater by this process are determined by the change of characteristic organic matter. It is difficult to remove the characteristic organic matter such as ester effectively, the energy power cost is 0.04206 yuan / ton when the treatment capacity is 6500t / h, and the cost of 30mg/L is 0.05786 yuan / ton and 0.06286 yuan / ton respectively, the cost of wastewater treatment is 0.05786 yuan / t ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1).
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X78

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