Environmental Systems Research

Table 4 The estimation of environmental change index (ΔY_i) and its components

From: Impact assessment of treating wastewater on the physiochemical variables of environment: a case of Kermanshah wastewater treatment plant in Iran

No.	Pollution	Time	Y_i/X	ΔX	ΔY _i
1	TSS (mg/l)	April	0.75	0.18	0.14
1	TSS (mg/l)	July	2.17	0.18	0.39
5	NO₃ (mg/l)	April	0.88	1.00	0.88
5	NO₃ (mg/l)	July	4.50	0.10	0.45
7	BOD (mg/l)	April	0.63	0.12	0.08
7	BOD (mg/l)	July	0.56	0.08	0.04
9	COD (mg/l)	April	1.00	0.10	0.10
9	COD (mg/l)	July	1.00	0.20	0.20
Average			1.43	0.24	0.28

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