【作者】 罗丹；

【导师】 叶代启； 高樱红；

【作者基本信息】 华南理工大学 ， 环境工程， 2009， 硕士

【摘要】 本论文以印染厂经过生化处理达标排放的染色废水为研究对象,研究开发废水回用深度处理工程技术。采用工艺路线为曝气生物滤池—微絮凝过滤—反渗透处理。处理规模为10m³/h。实验方式为集成式的现场中试实验,即逐步组合曝气生物滤池、曝气生物滤池-微絮凝过滤、曝气生物滤池-微絮凝过滤-反渗透等,对每个工艺单元的主要影响因素进行系统地实验研究,确定每个工艺的最佳运行操作参数。实验结果表明,曝气生物滤池水力负荷为0.80m³/m²·h时,进水量为10m³/h,停留时间为3.77h,过滤周期为7d,COD_Cr去除率为40.5%～66.3%,浊度去除率为75.3%。在稳定运行期间,出水氨氮小于1mg/L,COD_Crr为30～40mg/L,浊度≤5NTU。对于微絮凝过滤工艺,实验确定脱色剂最佳投加量为45mg/L,混凝剂最佳投加量为8mg/L,滤速为4.52～5.66m/h,过滤周期为10h。在稳定运行期间,出水COD_Cr为5.42～29.8mg/L,浊度0.6～1.5NTU,pH为8.1～8.8,溶解性总固体为5000～6000mg/L。过滤处理出水可确保SDI值满足反渗透膜的进水要求。对于反渗透处理工艺,采用正交实验方法研究了操作压力、回收率和进水pH对反渗透工艺性能的影响。三个因素对膜通量及脱盐率的影响程度为:操作压力＞回收率＞进水pH。操作压力增大,脱盐率呈线性增长趋势。实验确定最佳工作压力为1.2MPa。确定单支膜的最佳回收率为20%。运行周期为15d左右。膜清洗方法适于酸性化学清洗。稳定运行期间,膜通量为26.31L/m²·h,脱盐率稳定在99%左右。出水水质完全能够满足染色生产工艺用水要求。对工艺系统的运行成本进行了初步分析,按照中试规模为10m³/h,产生量为5 m³/h,则处理每吨水的运行成本为2.44元。本论文开发的染色废水深度处理工艺,技术路线科学合理,处理效果稳定,出水水质能够满足染色生产工艺要求,运行成本适中,为印染企业废水回用提供了一项可行的工程技术。更多还原

【Abstract】 The thesis aims to study the textile wastewater after biologically treated for further reuse in production. A treatment train was selected as biological aerated filtration -microflocculation filtration - one pass two stage reverse osmosis. The scale was 10 m³/d. A methodology as on site integrative experiments was adopted, with gradual combinations of biological aerated filtration, biological aerated filtration—microflocculation filtration, biological aerated filtration - microflocculation filtration - one pass two stage reverse osmosis. Major influencing factors were systematically investigated with experiments for each process unit, in order to obtain the optimal operation parameters.The experimental results showed that, biological aerated filter （BAF） had its best treatment effects at hydraulic loading of 0.80m³/m²·h at the scale of 10 m³/h, with filtration period of 7 days. COD_Cr removal efficiency is 66.3%, turbidity removal efficiency is 75.3%. During steady operation period, ammonia-nitrogen less than 1 mg/L, COD_Cr of the effluent ranged from 30 to 40mg/L, turbidity is less than 5NTU.For micro-flocculation filtration, the optimal operation dosage are 45mg/L for decolourant and 8mg/L for PAC as coagulant, filtration velocity at 4.52-5.66m/h, filtration period is 10h. During steady operation period, COD_Cr of the effluent is 5.42-29.8mg/L, turbidity is 0.6-1.5NTU, pH is 8.1-8.8, TDS is 5000-6000mg/L. SDI is about 5 which can reach the requirement of influent for reverse osmosis （RO） treatment.For RO treatment unit, an orthogonal experiment was designed with 3 factors: operating pressure, recovery rate and influent pH. The results indicated that operating pressure was the most obvious factor on water flux and desalting ratio, followed by the recovery rate, while pH has the smallest influence. The treatment efficiency may increase with the increase of operation pressure. The optimal operation pressure is determined as 1.2 MPa, and the optimal recovery rate as 20%. Operation period is about 15d. Chemical cleaning with acid is recommended. During steady state operation, the water flux is 26.31L/m²·h, desalting ratio was 99%. Full analysis of water quality demonstrated that the treated water can meet printing and dyeing production requirement. Preliminaly economic analysis was conducted for the running cost for the treatment train. Based on the treatment scale of 10m³/h, total water recovery is 50%, then the operational cost is about 2.44 yuan/m³.It is concluded that the technology developed in this thesis is feasible scientifically, its water quality is able to fulfill the production reqirements, the operation cost is affordable. It is believed the technology will become a practical engineering method for wastewater resuse in textile factories.更多还原