【作者】 傅雷鸣；

【导师】 陆兆新；

【作者基本信息】 南京农业大学 ， 食品工程， 2010， 硕士

【摘要】 食品行业高浓度含油废水排放量大,有机物浓度高,对水资源造成很大的污染。本丈采用气浮-膜生物反应器处理食品行业高浓度含油废水。试验结果表明：微气泡气浮法预处理对COD和油类的处理效果明显优于传统气浮法。最佳絮凝剂投加量为50mg/L聚合氯化铝铁(PAFC),最佳值pH为8,沉降为20 min时,溶气压力为0.4 MPa, COD和油类的去除率分别为65%和75%。设计含有兼氧区和好氧区的新型膜生物反应器,采用孔径为0.2-0.4微米的聚偏氟乙烯平板膜。在水力停留时间(HRT)为8 h,pH为7.2-7.8,温度为20-30℃,回流比为150%的条件下启动,经过近20天的培养出水COD、油类和氨氮分别低于100mg/L,0.5 mg/L和15 mg/L。膜生物反应器运行最佳工艺：HRT为8 h,pH为7.5,回流比为200%,COD、油类的去除率分别为97.6%和99.9%。60天的稳定性试验表明,膜生物反应器运行稳定,出水COD、油类和氨氮分别在85 mg/L,0.2 mg/L和7 mg/L左右。膜生物反应器运行期间,会出现膜污染导致膜通量下降、跨膜压差升高。建议在膜生物反应器运行过程中每15天进行一次强化曝气清洗,每45天进行一次化学清洗。更多还原

【Abstract】 The high strengthen oil containing wastewater with high concentrated organic contaminants, which charged from food industry, result in serious water resources pollution. And the air floatation-membrane bioreactor (MBR) process was applied for the high strengthen oil containing wastewater treatment.The results shown that the COD and oil removal effect of micro-bubble air floatation pretreatment method was better that of conventional air floatation. The COD and oil removal rate of 65% and 75% were obtained under the following optimum conditions:the flocculant dosage, pH, precipitation time and dissolving pressure were 50mg/L PAFC,8.0, 20min and 0.4 MPa, respectively.The novel type of membrane bioreactor composed of anoxic and aerobic areas was designed. The polyvinylidene fluoride flat membrane with the pore size ranging from 0.2 to 0.4 micron was used. The MBR was successfully started up in 20 days with hydraulic retention time, pH, temperature and reflux ratio were 8h,7.2～7.8,20～30℃and 150%, respectively. The effluent COD, oil and ammonia nitrogen were 100 mg/L,0.5 mg/L and 15 mg/L, respectively.The optimum operation conditions of MBR were as follows:hydraulic retention time, pH, and reflux ratio were 8h,7.5 and 200%, respectively. And removal rates of COD and oil were 97.6% and 99.9%, respectively. The results of stability test which last for 60 days indicated that the operation of the reactor was in a good state with the effluent COD, oil and ammonia nitrogen of about 85 mg/L,0.2 mg/L and 7 mg/L, respectively.The membrane was polluted during the operation of membrane bioreactor, and the flux of membrane was descend while the trans-membrane pressure was increased. It was suggest that the membrane should been cleaning once by strengthening aeration every 15days and by chemical agent every 15days during the operation.更多还原