pH BOD COD TS TDS CHLORIDE TSS NITRATE    
Correlation pH 1 0.222 0.27 -0.139 -0.04 0.172 -0.11 -0.38
BOD 0.222 1 0.293 0.174 0.175 0.198 0.003 -0.13
COD 0.27 0.293 1 0.076 0.131 0.223 0.086 -0.25
TS -0.14 0.174 0.076 1 0.349 0.144 -0.28 0.335
TDS -0.04 0.175 0.131 0.349 1 0.324 -0.17 0.08
CHLORIDE 0.172 0.198 0.223 0.144 0.324 1 -0.01 0.071
TSS -0.11 0.003 0.086 -0.281 -0.17 -0.005 1 0.013
NITRATE -0.38 -0.13 -0.25 0.335 0.08 0.071 0.013 1
Sig. (1-tailed) pH   0 0 0 0.156 0 0.003 0
BOD 0   0 0 0 0 0.471 0
COD 0 0   0.031 0.001 0 0.017 0
TS 0 0 0.031   0 0 0 0
TDS 0.156 0 0.001 0   0 0 0.025
CHLORIDE 0 0 0 0 0   0.448 0.04
TSS 0.003 0.471 0.017 0 0 0.448   0.372
NITRATE 0 0 0 0 0.025 0.04 0.372  
aDeterminant=0.334
Table 2: Correlation Matrixa for Physico-chemical parameters of untreated wastewater.