Table 1: Water quality parameters before BT and Chinese National Standard.

Sampling timeMonitoring project
Water temperature °CpHDO
mg/L
COD
mg/L
TP
mg/L
TN
mg/L
NH3N 
mg/L

National standard GB3838-2002Class V index6–92.0015.000.02.002.00
A14:4016.17.52.510.900.9614.8010.60
River water quality classVVInferior VInferior VInferior V
B16:0027.28.772.8112.100.8214.9011.20
River water quality classVVInferior VInferior VInferior V

A, B represent two criteria based on pH and temperature value.