Identification of two low-cost and locally available filter media (pumice and scoria) for removal of hazardous pollutants from tannery wastewater

Environmental Systems Research

Table 2 Characteristics of Dire tannery wastewater

SNo	Parameter	Concentration (mg/L) except pH and T°	Range
1	pH	9.1 ± 3.10	6.5–12.50
2	T° (°C)	20.6 ± 2.30	19–22
3	BOD₅	1081 ± 160	924–1243
4	COD	12,913 ± 6875	8046–21,025
5	TSS	2426 ± 515.20	1849–2840
6	NH₄–N	314 ± 60	259–378
7	NO₂–N	1.7 ± 0.30	1.4–1.99
8	NO₃–N	124 ± 13	110–135
9	PO₄–P	168 ± 74	112–252
10	Sulfide	417 ± 131	334–568
11	Sulfate	1307 ± 224	1118–1555
12	Total chromium	35.7 ± 90	28–45