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

Table 2

Characteristics and LPI of leachate from AJLS and KSLS*.

Parameter	Value		Individual pollution rating (𝑝𝑖)		weights (𝑤𝑖)		Cumulative pollution rating (𝑝𝑖𝑤𝑖)
	AJLS	KSLS	AJLS	KSLS	AJLS	KSLS	AJLS	KSLS
pH	7.5	8.1	5	5	0.055	0.055	0.275	0.275
TDS	2543	12568	7	26	0.050	0.050	0.35	1.3
BOD5	48	85	7	26	0.061	0.061	0.427	0.488
COD	599	990	20	35	0.062	0.062	1.24	2.17
TKN	822	1176	25	39	0.053	0.053	1.235	2.06
NH3-N	566	996	60	100	0.051	0.051	3.06	5.1
Total iron	3	5	5	5	0.045	0.045	0.225	0.225
Cu	0	0.7	5	5	0.050	0.050	0.25	0.25
Ni	0	0.3	5	5	0.052	0.052	0.26	0.26
Zn	0.01	0.2	5	5	0.056	0.056	0.28	0.28
Pb	0.3	0.4	5	5	0.063	0.063	0.31	0.31
Cr	0	0.05	5	5	0.064	0.064	0.32	0.32
Hg	—	—	—	—	—	—	—	—
As	—	—	—	—	—	—	—	—
Phenol	2	4	7	9	0.057	0.057	0.39	0.51
Chlorides	124	655	5	7	0.048	0.048	0.24	0.336
Cyanide	—	—	—	—	—	—	—	—
Total coliform	0.66×10^4	0.16×10^4	87	76	0.052	0.052	4.52	3.95
Total					0.819	0.819	13.47	17.83
LPI							16.44	21.77

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