Table 2.

Characteristics of raw TWW

Parameters (mg L−1)	Raw TWW	Safe limits
DO	1.42 ± 0.349
BOD	1234 ± 1.78	100 (BIS 1994)
COD	3325 ± 2.13	250 (BIS 1994)
Nitrate Nitrogen	10 ± 0.77	10 (U.S. Environmental Protection agency)
Phosphate	1.1 ± 0.10	1 (BIS 1994)
Ammoniacal Nitrogen	342 ± 0.93	12 (WHO 1981)
TDS	8400 ± 4.1	2100 (BIS 1994)
Sulfide	25 ± 0.96	10 (WHO 1981)
Chromium	1.8	2 (BIS 1994)
Cadmium	< 0.01	0.6 (Chowdhury et al. 2015)
Iron	2	0.3 (WHO 1981)
Lead	< 0.1	2 (Chowdhury et al. 2015)