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Table 4

Correlation matrix of physicochemical parameters of urban wastewaters

pHECTSSCODBOD5TKNTPAbs.UV.254
Greywater 
 pH        
 EC 0.23       
 TSS 0.05 0.17      
 COD −0.03 0.18 0.79***     
 BOD5 −0.04 0.24 0.69*** 0.94***    
 TKN 0.21 0.17 −0.09 0.15 0.23   
 TP 0.15 0.30 0.04 0.18 0.30 0.85***  
 Abs.UV.254 0.18 0.46* 0.23 0.49*** 0.55** 0.75*** 0.75*** 
Blackwater 
 pH        
 EC −0.01       
 TSS −0.17 0.34      
 COD −0.05 0.36* 0.68***     
 BOD5 −0.08 0.31 0.62*** 0.95***    
 TKN 0.05 0.1 0.11 0.39* 0.38*   
 TP 0.04 0.05 0.11 0.28 0.26 0.90***  
 Abs.UV.254 0.01 0.01 −0.14 −0.27 −0.21 0.12 0.14 
Commercial laundry wastewater 
 pH        
 EC 0.35       
 TSS 0.22 0.47      
 COD −0.01 0.30 0.52*     
 BOD5 −0.16 0.22 0.64* 0.91***    
 TKN −0.33 0.08 0.62* 0.81** 0.96***   
 TP 0.05 0.16 0.53* 0.42 0.44 0.46*  
 Abs.UV.254 0.08 0.10 0.17 −0.04 −0.05 0.10 0.52* 
Hospital wastewater 
 pH        
 EC − 0.78**       
 TSS 0.34 −0.16      
 COD 0.70* − 0.65* 0.45     
 BOD5 0.44 − 0.58 0.41 0.85**    
 TKN 0.25 −0.03 −0.18 0.04 −0.13   
 TP 0.83** − 0.63* 0.24 0.56 0.20 0.36  
 Abs.UV.254 0.71* − 0.55 0.26 0.82** 0.53 0.21 0.55 
Pharmaceutical wastewater 
 pH        
 EC −0.07       
 TSS −0.33 0.42      
 COD −0.20 0.18 0.83***     
 BOD5 −0.30 0.41 0.67* 0.71*    
 TKN 0.35 −0.42 0.27 0.33 0.10   
 TP −0.62 0.21 0.66* 0.70* 0.74* 0.09  
 Abs.UV.254 −0.20 0.18 0.83** 0.99*** 0.71* 0.33 0.70* 
pHECTSSCODBOD5TKNTPAbs.UV.254
Greywater 
 pH        
 EC 0.23       
 TSS 0.05 0.17      
 COD −0.03 0.18 0.79***     
 BOD5 −0.04 0.24 0.69*** 0.94***    
 TKN 0.21 0.17 −0.09 0.15 0.23   
 TP 0.15 0.30 0.04 0.18 0.30 0.85***  
 Abs.UV.254 0.18 0.46* 0.23 0.49*** 0.55** 0.75*** 0.75*** 
Blackwater 
 pH        
 EC −0.01       
 TSS −0.17 0.34      
 COD −0.05 0.36* 0.68***     
 BOD5 −0.08 0.31 0.62*** 0.95***    
 TKN 0.05 0.1 0.11 0.39* 0.38*   
 TP 0.04 0.05 0.11 0.28 0.26 0.90***  
 Abs.UV.254 0.01 0.01 −0.14 −0.27 −0.21 0.12 0.14 
Commercial laundry wastewater 
 pH        
 EC 0.35       
 TSS 0.22 0.47      
 COD −0.01 0.30 0.52*     
 BOD5 −0.16 0.22 0.64* 0.91***    
 TKN −0.33 0.08 0.62* 0.81** 0.96***   
 TP 0.05 0.16 0.53* 0.42 0.44 0.46*  
 Abs.UV.254 0.08 0.10 0.17 −0.04 −0.05 0.10 0.52* 
Hospital wastewater 
 pH        
 EC − 0.78**       
 TSS 0.34 −0.16      
 COD 0.70* − 0.65* 0.45     
 BOD5 0.44 − 0.58 0.41 0.85**    
 TKN 0.25 −0.03 −0.18 0.04 −0.13   
 TP 0.83** − 0.63* 0.24 0.56 0.20 0.36  
 Abs.UV.254 0.71* − 0.55 0.26 0.82** 0.53 0.21 0.55 
Pharmaceutical wastewater 
 pH        
 EC −0.07       
 TSS −0.33 0.42      
 COD −0.20 0.18 0.83***     
 BOD5 −0.30 0.41 0.67* 0.71*    
 TKN 0.35 −0.42 0.27 0.33 0.10   
 TP −0.62 0.21 0.66* 0.70* 0.74* 0.09  
 Abs.UV.254 −0.20 0.18 0.83** 0.99*** 0.71* 0.33 0.70* 
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