Parameters

Author and Sampling Date

Maximum Permissible Limit (EPA, 2003)

Zinabu and Desta (2002)

(Nov. 1995 to March 1996)

Abay, 2007

(Nov. 2006 to March 2007)

Berehanu and Lemma (2009) [20]

(May, 2008)

Present Work

(Dec., 2009)

COD mg/l

-

5183

-

400

150

DO mg/l

0.75

NS

mg/l

31

17.8

8.7

5.3

50

TN mg/l

-

353.8

-

40

40

mg/l

-

9.04

7.3

386

10

S²⁻ mg/l

-

1.7

0.046

2.0

mg/l

56

136.3

ND

0.052

200

TDS mg/l

-

3818.5

2626

1530

80

EC (μS/cm)

-

5455

3110

3030

1000