厌氧复合床处理模拟焦化废水的反硝化动力学  

Denitrification dynamics of treating analog coking wastewater in upflow blanket filter

作　　者：杜宪[1] 岳秀萍[1] 王孝维[1] 刘吉明[1] 米静[1] 

机构地区：[1]太原理工大学环境科学与工程学院,山西太原030024

出　　处：《化工学报》2013年第7期2650-2655,共6页CIESC Journal

摘　　要：采用厌氧复合床(UBF)处理模拟焦化废水,进水中投加NaNO3模拟硝化液回流,实现了同时反硝化/产甲烷,COD去除率达到94%,NO3--N去除率达到99%。取复合床下部污泥做反硝化动力学研究,在存在亚硝酸盐积累的情况下,以NO3--N+0.6NO2--N作为反硝化电子受体,采用双基质的Monod方程对实验数据进行拟合,拟合曲线与实验测定值相关性良好。其次,采用双基质的Monod微分方程组对NO3--N和NO2--N的浓度变化进行拟合,得到相关参数:硝态氮的最大比降解速率和半饱和常数分别为1.13d-1和2.0mg·L-1;亚硝态氮的最大比降解速率和半饱和常数分别为0.66d-1和2.5mg·L-1,基于硝态氮和亚硝态氮的有机物半饱和常数分别为90.8mg·L-1和96.8mg·L-1。In treating simulation coking wastewater in upflow blanket filter（UBF）,addition of NaNO3 in water for simulating backflow of nitrification liquid results in simultaneous methanogenesis and denitrification,along with COD removal rate 94%,and NO-3-N removal efficiency 99%.In denitrification dynamics research of the sludge at the bottom of the UBF,double-substrates Monod model was adopted to fit the test data obtained under conditions of nitrite accumulation,NO-3-N＋0.6NO-2-N as the electronic acceptor of denitrification.The results show that there is a good correlation between the fitting curve and the experimental measurement.Then differential model based on Monod model was used to fit the change in the concentration of NO-3-N and NO-2-N respectively,relevant parameters obtained were as follows：The maximum specific degradation rate and half-saturation constant are 1.13 d-1 and 2.0 mg·L-1 for NO-3-N,and 0.66 d-1 and 2.5 mg·L-1for NO-2-N.The half-saturation constant of organic substrate based upon NO-3-N and NO-2-N are 90.8 mg·L-1 and 96.8 mg·L-1.

关 键 词：焦化废水 反硝化动力学 亚硝酸盐积累 

分 类 号：X703[环境科学与工程—环境工程]