强化除磷BAF处理石化二级出水  

Enhanced phosphorus removal in BAF treating petrochemical secondary effluent

作　　者：郭明昆 吴昌永[2] 周岳溪[2] 王群[1] 王翼[3] 郭洪文 高薇 

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都611756 [2]中国环境科学研究院水污染控制技术研究中心,北京100012 [3]兰州交通大学环境与市政学院,甘肃兰州730070 [4]中国石油吉林石化污水处理厂,吉林省吉林市132000

出　　处：《化工学报》2015年第10期4236-4243,共8页CIESC Journal

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07201-005);国家自然科学基金项目(51208484)~~

摘　　要：为强化曝气生物滤池（BAF）的除磷效果,以石化二级出水为处理对象,研究了投加FeSO4·7H2O对BAF除磷性能的强化作用并对投量进行了优化,同时分析了FeSO4·7H2O投加对BAF除碳、脱氮和生物膜活性的影响。结果表明：投加少量FeSO4·7H2O（3~15mg·L^-1）能有效强化BAF的除磷性能;BAF除磷的效果随FeSO4·7H2O投加量的增加而提高,但在投量高于9mg·L^-1时增加趋势逐渐变缓,当FeSO4·7H2O的投加量为9mg·L^-1时,TP的去除率达到57.0%以上,而同期平行运行的BAF除磷效率为7.1%。BAF中少量投加FeSO4·7H2O对COD的去除没有不良影响,COD的去除率比对比装置平均提高了5.4%左右,对相对分子质量较大的有机物去除明显。FeSO4·7H2O投加量低于12mg·L^-1时对NH4^＋-N的去除没有不良影响,高于15mg·L^-1时由于生物膜中微生物活性的下降NH4^＋-N去除率有所降低。投加FeSO4·7H2O对TN的去除影响甚微。Fe^2＋的投加使得BAF中附着微生物的量有所降低,但在12mg·L^-1以下时不会造成大的影响,FeSO4·7H2O投量在3~9mg·L^-1时BAF中生物膜的脱氢酶活性和比好氧呼吸速率有所增加,可弥补生物量降低的影响,因此BAF的运行状况未受到影响。Two parallel biological aerated filters （BAF）, named as BAF1 and BAF2 （feeding with FeSO4·7H2O）, were used to treat petrochemical secondary effluent. The performance of the reactors, especially the phosphorus removal ability, was investigated. In addition, the biomass and the biofilm activity were also studied. The results showed that the phosphorus removal could be enhanced obviously with the suitable dosage of FeSO4·7H2O （3—15 mg·L^-1）. The phosphorus removal rate increased with the increase dosage of FeSO4·7H2O. However, the increasing trend became slowly when the dosage of FeSO4·7H2O was over 9 mg·L^-1. The TP removal rate was over 57.0% in BAF2 when the dosage of FeSO4·7H2O was 9 mg·L^-1, while it was only 7.1% in BAF1. The dosage of FeSO4·7H2O had no adverse effect on COD removal and the average COD removal rate in BAF2 was 5.4%,which was higher than that in BAF1. In addition, organic pollutants with high molecular weight were removed more obviously in BAF2 than that in BAF1. The dosage of FeSO4·7H2O had slightly effect onNH4^＋-N removal when the dosage was lower than 15 mg·L^-1. However, it decreased when the dosage was 15 mg·L^-1 due to the decrease of biofilm activity. There was almost no difference in TN removal in the two BAFs. The dosage of FeSO4·7H2O can decrease the amount of biofilm, but the biofilm reduction was not obvious when the dosage was lower than 12 mg·L^-1. The activity of the biofilm increased when the FeSO4·7H2O dosage was between 3 to 9 mg·L^-1, weakening the effect of the slightly biomass reduction, and therefore the performance of BAF2 was not affected.

关 键 词：曝气生物滤池 石化二级出水 强化除磷 生物膜 脱氢酶活性 

分 类 号：X703.1[环境科学与工程—环境工程]