Treatment of Tanning Effluent Using Seaweeds and Reduction of Environmental Contamination

Table 4

Physical and chemical characteristics of feed and treated effluent—5 days retention time.

S.NO	Parameters	Feed effluent	After treatment	Removed from waste water	Removal percentage
1	pH	8.30	8.22	0.08	—
2	TDS	12150 mg/lit	11410 mg/lit	740 mg/lit	93.90%
3	BOD	845 mg/lit	720 mg/lit	125 mg/lit	85.06%
4	COD	3400 mg/lit	2920 mg/lit	480 mg/lit	85.35%
5	NO2	0.013 mg/lit	0.010 mg/lit	0.003 mg/lit	76.92%
6	NO3	2.878 mg/lit	2.161 mg/lit	0.717 mg/lit	75.08%
7	Phosphate	52.38 mg/lit	38.09 mg/lit	14.29 mg/lit	72.71%
8	Turbidity	0.5 NTU	0.3 NTU	0.2 NTU	90.73%

value on the pH scale.