Eichhornia crassipes Efficacy in Secondary Wastewater Treatment in the Western Highlands of Cameroon

Table 2

Percentage reduction in the physicochemical parameters of the wastewater in the various lagoons during the dry season and rainy season.

Season	Parameters (%)	Vegetated system					Control system
		Anaerobic lagoon	Facultative lagoon 1	Facultative lagoon 2	Maturation lagoon	Overall reduction	Anaerobic lagoon	Facultative lagoon 1	Facultative lagoon 2	Maturation lagoon	Overall reduction
Dry season	EC	16.94	18.36	15.63	−2.26	41.43	29.39	22.35	−5.71	−2	40.88
	TDS	7.1	19.11	15.12	−2.9	34.38	22.73	22.43	−6.16	−4.46	33.52
	TSS	51.64	3.01	10.08	−109.86	−8.36	61.45	−5.66	−100.89	−10.22	9.82
	Color	59.04	4.97	8.76	−56.4	44.46	52.51	12.26	−48.64	1.07	38.73
	NO3−	0	44.29	−243.59	87.31	0	0	29.41	−408.33	100	0
	PO4^3−	22.86	19.37	−28.23	53.73	63.1	23.99	40.64	0.53	15.38	62.02
	BOD5	−4.94	11.53	−67.55	−0.79	−56.79	14.81	38.12	23.89	−300	−60.49
	COD	−44.56	−48.21	27.39	14.49	−32.88	−26.22	3.55	24.11	−21.03	−11.82
	FS	85.48	61.11	100	0	100	87.9	33.33	100	0	100
	FC	73.57	28.33	23.26	−72.73	74.89	80.18	68.89	−721.43	−39.13	29.52
Rainy season	EC	51.22	14.16	20.44	−35.78	54.77	52.32	−73.08	6.67	−21.43	6.47
	TDS	51.04	14.81	19.42	−35.97	54.3	51.64	−72.5	5.8	−16.92	8.12
	TSS	62.13	65.63	40.91	−130.77	82.25	34.91	−180.91	−56.96	−25.15	−259.17
	Color	50.49	43.62	32.41	6.26	82.31	45.72	−50.38	−45.08	15.24	−36.47
	NO3−	0	−146.51	−41.5	57.33	0	0	0	92.59	−1150	0
	PO4^3−	10.02	65.17	32.25	36.85	86.59	33.62	29.22	27.67	−65.59	43.72
	BOD5	−10.63	91.32	−315.53	−10.05	56.06	−25.93	67.26	39.37	−612.69	−78.17
	COD	−40.23	11.07	53.92	−27	27.01	−89.08	−182.37	39.4	−60.57	−419.54
	FS	97.39	66.67	100	0	100	100	0	54.1	−703.57	−95.65
	FC	78.1	71.7	−60	−466.67	43.80	48.76	−81.45	51.11	−7.27	51.24