$T_{j,j=1,2\dots m}$	The sewage treatment process
$A_{i,i=1,2\dots n}$	The sites of sewage treatment plant
$Q_{i,i=1,2\dots n}$	The sewage treatment capacity
$v_{in0}^{\alpha }$ $v_{in0}^{\beta }$	Influent concentrations (COD and ammonia nitrogen)
$v_{outi,i=1,2\dots n}^{\alpha }$ $v_{outi,i=1,2\dots n}^{\beta }$	Effluent concentrations (COD and ammonia nitrogen)
$B_{i,i=1,2\dots k}$	The main distributions of sewage source around the treatment plant
$q_{i,i=1,2\dots k}$	The sewage volumes of each sewage source
$C_i(Q_i,T_j),i=1,2\dots n;j=1,2\dots m$	Investment costs of the plant construction
$L_i(l_i),i=1,2\dots n$	The cost of off-site pipe network
$l_{i,i=1,2\dots n}$	The length of the pipeline
$D_i(s_i),i=1,2\dots n$	The costs of land expropriation and household demolition compensation
$s_{i,i=1,2\dots n}$	The occupied area of the sewage treatment plant
${\lambda }_{i,i=1,2\dots n}$	The reuse rates of reclaimed water
$E_{i,i=1,2\dots n}$	The economic benefits per unit reclaimed water
$F_i(T_j),i=1,2\dots n;j=1,2\dots m$	The management operation cost
${\delta }_{i,i=1,2\dots n}$	The score value of the optional site $i$ for the decision makers