Kun Zhu,Ziyuan Lin,Wei Huang,Hong Meng,Jian Zhou*

The IWA 2017 Conference on Sustainable Wastewater Treatment and Resource Recovery: Research, Planning, Design and Operation

The impact of reaction parameters on advanced phosphorus and nitrogen removal efficiency in Sequencing Batch Biofilm Reactor (SBBR) System based on Response Surface Methodology

Kun Zhu,Ziyuan Lin,Wei Huang,Hong Meng,Jian Zhou*

1Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400045, PR China

2Key Laboratory of the Three Gorges Reservoir’s Eco-Environments, Ministry of Education, Chongqing University, Chongqing 400045, PR China

*Jian Zhou,

Keywords: SBBR, Response Surface Methodology, phosphorus and nitrogen removal, advanced treatment, parameters.

Abstract: Responding to the long process and high investment/operation costs of the existing urban sewage treatment plants, advanced phosphorus and nitrogen removal based on condition control was investigated in Sequencing Batch Biofilm Reactor (SBBR). Comprehensive effects of reaction parameters on treatment efficiency were identified using Response Surface Methodology. The total nitrogen (TN) and the phosphate (PO43--P) removal rates were taken as dependent variables while the carbon to nitrogen ratio (C/N) (A), dissolved oxygen (DO) (B) and temperature (C) were taken as independent variables. The Box-Benhnken (BBD) experimental design method and the quadratic polynomial model were applied. Result in response surface equations was illustrated as: ηTN =80.00 + 3.5A + 15.63B +13.13C +1.00AB -3.5AC + 8.75BC – 3.13A2 - 17.88B2+1.13C2、ηPO43--P= 89.60 + 6.38A + 17.63B -7.25C -6.75AB +1.5AC -2BC-2.93A2 - 15.43B2-7.17C2. Further analysis by ANOVA method proved that the obtained equations were applicable to describe the relation between the independent variables and the response values. The result demonstrated that DO and temperature significantly affected both the phosphorus and the nitrogen removal rates whilst C/N had a remarkable effect on nitrogen removal efficiency. Theimpactdegree of three parameters was DO, temperature and C/N, successively. The interaction of C/N with DO and interaction of DO with temperature significantly affected the nitrogen removal rate. Moreover, PO43--P removal rate was obviously influenced by the interaction of C/N and DO. The quantifications of relation between operating parameters and system performance were achieved by the response equations which could be used to guide the optimization of operating parameters in SBBR system for advanced phosphorus and nitrogen removal.