Variability of Parameters Involved in Leachate Pollution Index and Determination of LPI from Four Landfills in Malaysia

Table 1

Characteristics and LPI of leachate from PBLS and KLS*.

Parameter	Value		Individual pollution rating (𝑝𝑖)		weights (𝑤𝑖)		Cumulative pollution rating (𝑝𝑖𝑤𝑖)
	PBLS	KLS	PBLS	KLS	PBLS	KLS	PBLS	KLS
pH	8.3	7.8	5	5	0.055	0.055	0.275	0.275
TDS	9693	6900	19	15	0.050	0.050	0.95	0.75
BOD5	358	515	11	15	0.061	0.061	0.671	0.915
COD	1788	1593	47	42	0.062	0.062	2.914	2.604
TKN	1685	612	60	20	0.053	0.053	3.18	1.06
NH3-N	1380	503	100	55	0.051	0.051	5.1	2.8
Total iron	3.6	6	5	5	0.045	0.045	0.225	0.225
Cu	0.01	0.2	5	6	0.050	0.050	0.25	0.3
Ni	0.1	0.2	6	6	0.052	0.052	0.312	0.312
Zn	0.3	0.3	6	6	0.056	0.056	0.336	0.336
Pb	3	1.6	27	11	0.063	0.063	1.7	0.693
Cr	0.2	0.1	5	5	0.064	0.064	0.32	0.32
Hg	—	—	—	—	—	—	—	—
As	—	—	—	—	—	—	—	—
Phenol	6	3	10	8	0.057	0.057	0.57	0.456
Chlorides	622	290	7	5	0.048	0.048	0.336	0.24
Cyanide	—	—	—	—	—	—	—	—
Total coliform	50	0.81×10^4	40	90	0.052	0.052	2.08	4.68
Total					0.819	0.819	19.21	15.97
LPI							23.45	19.50

*All values in mg/L except pH and total coliform; total coliform unit (CFU/100 mL).