ABS树脂废水混凝深度处理技术及达标处理工艺研究

发布时间：2018-06-30 00:27

本文选题：ABS树脂废水 + 深度处理　；参考：《兰州交通大学》2017年硕士论文

【摘要】：ABS树脂生产过程中产生大量高浓度有机废水,其中包含丙烯腈、苯乙烯、丁二烯的聚合物、ABS乳液、松香肥皂、十二烷基硫醇、乙苯及其他未反应有机单体等,属于典型高N、P,高有机物,高胶乳废水。东北一化工厂ABS树脂废水,目前经过混凝气浮工艺预处理后直接进入化工污水综合处理厂进行处理,但由于ABS树脂废水的特殊性,对该污水处理厂的达标排放造成了一定威胁,为此拟对该ABS树脂废水单独进行处理。论文研究内容为国家水体污染控制与治理科技重大专项《松花江石化行业有毒有机物全过程控制关键技术与设备》的一部分。本文在大量现场调研及前期混凝气浮-A/O工艺小试试验的基础上,针对ABS树脂废水生物处理出水的水质特征,考察了混凝沉淀工艺对混凝气浮-A/O出水达标排放的可行性,优化了反应条件,初步构建了ABS树脂废水达标处理工艺。并在此基础上开展了混凝气浮-A/O-混凝沉淀工艺处理ABS树脂生产废水的现场中试试验。获得的主要结论如下:(1)混凝剂及助凝剂筛选结果表明,以三氯化铁做为混凝剂、阳离子型聚丙烯酰胺为助凝剂对混凝气浮-A/O工艺出水深度处理效果最佳,且最佳投加量为三氯化铁200mg/L,阳离子型聚丙烯酰胺为5mg/L,最佳工艺条件为混合搅拌1min,絮凝搅拌15min,沉淀时间为30min。优化工艺条件下混凝沉淀出水TP及COD可稳定达到《合成树脂工业污染物排放标准》规定排放限值,进一步过滤处理后可稳定达到特别排放限值。(2)混凝沉淀工艺进、出水分子量分布、三维荧光光谱、红外光谱及紫外光谱分析结果表明:A/O工艺出水中悬浮有机物及分子量100kDa以上的大分子物质TOC贡献率为39.45%,混凝沉淀后悬浮有机物及分子量100kDa以上的大分子物质TOC贡献率减少到20%。经过混凝沉淀处理后,出水中蛋白类物质减少19%。混凝沉淀处理单元运行成本约为1元/吨。(3)在水力停留时间为48h,硝化液回流比为500%的条件下,A/O单元对COD、TP、TN及氨氮的去除率可分别达到92.16%、42.92%、90.9%、76.13%。进水中特征污染物在A/O单元基本被完全去除。混凝沉淀工艺对COD、TP的去除率可分别达到35.26%、97.32%,出水COD、TP分别为50.36mg/L和0.126mg/L,60%左右的出水COD浓度可降至50mg/L。(4)经过混凝气浮+A/O+混凝沉淀组合工艺处理后,出水中TN、TP、SS及氨氮分别为:9.648mg/L、24.77 mg/L、7.03mg/L、3.24mg/L,去除率分别为90.6%、99.4%、98.3%和81.63%,均能达到《合成树脂工业污染物排放标准》(GB31572-2015)中的特别排放限值。出水COD为51.44mg/L,COD去除率96.2%,可达到《合成树脂工业污染物排放标准》(GB31572-2015)中对COD 60mg/L的排放要求。本研究对实际ABS树脂废水的处理可提供技术支持。
[Abstract]:During the production of ABS resin, a large amount of high concentration organic wastewater was produced, including acrylonitrile, styrene, butadiene polymer ABS emulsion, rosin soap, dodecyl mercaptan, ethylbenzene and other unreacted organic monomers, etc. It belongs to typical high NNP, high organic matter and high latex wastewater. At present, ABS resin wastewater from the first chemical plant in Northeast China has been pretreated by coagulation and air floatation process and directly entered the chemical wastewater treatment plant for treatment. However, due to the particularity of ABS resin wastewater, the discharge standard of the wastewater treatment plant has been threatened to a certain extent. Therefore, the ABS resin wastewater will be treated separately. The research content of this paper is a part of the key technology and equipment for the whole process control of toxic organic matter in Songhua River petrochemical industry, which is a major scientific and technological project of national water pollution control and control. On the basis of a large number of field investigations and pilot tests of coagulation air floatation (A- / O) process, the feasibility of coagulation sedimentation process for the effluent discharge standard of coagulation flotation-A- /-O was investigated according to the water quality characteristics of biological treatment of ABS resin wastewater. The reaction conditions were optimized and the treatment process of ABS resin wastewater was preliminarily constructed. On the basis of this, a pilot test on treatment of ABS resin production wastewater by coagulation air flotation-A / O-coagulation precipitation process was carried out. The main conclusions are as follows: (1) the screening results of coagulant and coagulant aid show that the advanced treatment effect of flocculating air floatation A / O process with ferric chloride as coagulant and cationic polyacrylamide as coagulant is the best. The optimum dosage of ferric chloride is 200 mg / L, the cationic polyacrylamide is 5 mg / L, the optimum technological conditions are mixed stirring for 1 min, flocculation for 15 minutes and precipitation time for 30 min. Under optimized process conditions, TP and COD of effluent from coagulation and precipitation can reach the prescribed discharge limit value of the Industrial Pollutant discharge Standard of synthetic Resin, and after further filtration treatment, it can reach the special discharge limit value. (2) Coagulation and precipitation process is advanced. Water molecular weight distribution, three dimensional fluorescence spectrum, The results of IR and UV spectra showed that the TOC contribution rate of suspended organic compounds and macromolecular substances with molecular weight above 100kDa was 39.45, while the TOC contribution rate of suspended organic compounds and macromolecular substances with molecular weight above 100kDa decreased to 20 kDa after coagulation and precipitation. After coagulation and precipitation treatment, the amount of protein in effluent decreased by 19%. The operating cost of coagulation and precipitation treatment unit is about 1 yuan / ton. (3) under the condition of 48h HRT and 500% reflux ratio of nitrifying liquid, the removal rates of CODN TPTN and NH3-N by A- / O unit can reach 92.16% ~ 42.92N ~ (99. 9) and 76.13% respectively. The characteristic pollutants in the influent were basically removed completely in the A / O unit. The removal rate of CODN TP by coagulation precipitation process can reach 35.26% and 97.32% respectively. The COD concentration of effluent with COD of 50.36 mg / L and 0.126 mg / L of 60% respectively can be reduced to 50 mg / L. (4) after the combined process of coagulation flotation / A- / O coagulation and precipitation, the COD concentration of effluent can be reduced to 50 mg / L. (4) after the treatment of coagulation floatation, the concentration of COD in the effluent can be reduced to 50 mg 路L ~ (-1) 路L ~ (-1). In the effluent, the TPSS and NH3-N were: 9. 648 mg / L = 24.77 mg / L = 7.03 mg / L = 3.24 mg / L, respectively, and the removal rates were 90.6% and 99.4% respectively, and 81.63%, respectively, which could reach the special emission limit of the Industrial Pollutant discharge Standard for synthetic Resin (GB31572-2015). The COD removal rate of effluent is 51.44 mg 路L ~ (-1) 路L ~ (-1), which can meet the requirement of COD ~ (60 mg / L) in the Industrial Pollutant discharge Standard of synthetic Resin (GB31572-2015). This study can provide technical support for the treatment of ABS resin wastewater.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X783.2

【参考文献】