Assessment of the Nutrients in the Leachate and the Groundwater Quality for Drinking and Farming around the Nkolfoulou Landfill in Yaoundé, Cameroon

Table 2

Physicochemical characteristics of the leachate from the Nkolfoulou landfill.

Parameter	Sampling period		Mean	SD	Percent decrease or increase (%)	Cameroonian effluent limits [31]
	Long dry season	Long wet season
T (°C)	26.7	26.2	26.5	0.4	−1.87	30
pH	8.9	8.2	8.6	0.5	−8.54
EC (μS/cm)	23400	17500	20450	4172	−25.21	—
TDS (mg/L)	7800	7000	7400	566	−10.26	—
TSS (mg/L)	70.2	130.2	100.2	42.4	85.47	50
Turbidity (NTU)	14.2	21.3	17.8	5.0	50.0	—
TH (mg/L)	424.56	349.64	387.10	52.97	−17.65	—
TA (mg·/L)	748.04	558.09	653.06	134.31	−25.39	—
(mg·/L)	100	140	120	29	40.00	100
COD (mg·/L)	1350	1750	1550	283	29.63	200
/COD	0.07	0.08	0.08	0.00	8.00	—
(mg/L)	465.24	200.62	332.93	187.11	−56.88	—
(mg/L)	350.75	231.45	291.10	84.36	−34.01	—
(mg/L)	75.23	60.13	67.68	10.68	−20.07	—
(mg/L)	45.96	40.86	43.41	3.61	−11.10	—
(mg/L)	82.5	39.51	61.01	30.40	−52.11	0.1
(mg/L)	159.32	74.82	117.07	59.75	−53.04	20
(mg/L)	702.69	345.50	524.10	252.57	−50.83	50
(mg/L)	3.48	2.50	2.99	0.69	−28.16	—
	ND	ND	—	—	—	3
	50.24	10.60	30.42	28.03	−78.90	—
(mg/L)	923.50	689.00	806.25	165.82	−25.39	—
Colour (mg/L pt-Co)	5208.33	4654.75	4931.54	391.44	−10.63	—
Appearance	Dark-brown	Brown	—	—	—	Colourless
Odour	Pungent	Pungent	—	—	—	Odourles

ND = not detected; SD = standard deviation.