Table 2.

The average concentrations of effluent pollutants and their removal efficiency in each treatment wetland reactor.

Time in weeks	Parameter	Unit	Influent	CW 1		CW2		CW3
				Effluent Conc.	R (%)	Effluent Conc.	R (%)	Effluent Conc.	R (%)
Week 1	BOD	mg/L	3,200	908.89 ± 76.88	71.6 ± 2.40	1538.3 ± 73.53	51.9 ± 2.30	1173.3 ± 50.00	63.3 ± 1.56
	COD	mg/L	7,500	1888.7 ± 240.75	74.8 ± 3.21	4892.4 ± 244.36	34.7 ± 3.26	3049.2 ± 279.39	59.3 ± 3.73
	NH4+-N	mg/L	3.85	0.78 ± 0.08	79.6 ± 2.21	3.10 ± 0.06	19.4 ± 1.54	1.61 ± 0.15	58.0 ± 3.84
	NO3−-N	mg/L	20	4.43 ± 0.66	77.8 ± 3.29	12.03 ± 0.20	39.8 ± 0.99	9.94 ± 0.36	50.2 ± 1.81
	OP	mg/L	2.93	0.36 ± 0.06	87.7 ± 1.93	2.10 ± 0.03	28.2 ± 1.15	1.28 ± 0.06	56.3 ± 2.15
	TDS	mg/L	2.000	456.78 ± 61.16	77.1 ± 3.06	1500.2 ± 23.27	24.9 ± 1.16	1047.0 ± 24.93	47.6 ± 1.25
	TN	mg/L	35	8.81 ± 1.79	74.8 ± 5.13	25.33 ± 0.34	27.6 ± 0.97	17.11 ± 0.51	51.1 ± 1.45
	TP	mg/L	12	2.27 ± 0.23	81.0 ± 1.88	7.59 ± 0.15	36.7 ± 1.29	3.35 ± 0.20	72.0 ± 1.66
	TSS	mg/L	1,800	512.67 ± 51.33	71.5 ± 2.85	676.44 ± 30.34	62.4 ± 1.69	990.67 ± 53.59	44.9 ± 2.98
	pH		7.50	6.99 ± 0.08	–	6.17 ± 0.16	–	7.45 ± 0.27	–
Week 2	BOD	mg/L	3,200	984.44 ± 109.90	69.2 ± 3.43	1556.6 ± 65.72	51.3 ± 2.05	1278.3 ± 55.00	60.0 ± 1.72
	COD	mg/L	7,500	1900.0 ± 217.89	74.6 ± 2.91	5108.6 ± 225.77	31.8 ± 3.01	3322.3 ± 316.08	55.7 ± 4.21
	NH4+-N	mg/L	3.85	0.80 ± 0.09	79.1 ± 2.37	3.10 ± 0.09	19.5 ± 2.43	1.65 ± 0.10	57.0 ± 2.67
	NO3−-N	mg/L	20	4.65 ± 0.27	76.7 ± 1.36	12.24 ± 0.37	38.7 ± 1.86	10.03 ± 0.29	49.8 ± 1.46
	OP	mg/L	2.93	0.40 ± 0.05	86.3 ± 1.65	2.11 ± 0.07	27.8 ± 2.43	1.33 ± 0.04	54.6 ± 1.51
	TDS	mg/L	2,000	503.44 ± 60.14	74.8 ± 3.01	1527.5 ± 39.06	23.6 ± 1.95	1074.6 ± 46.16	46.2 ± 2.31
	TN	mg/L	35	10.13 ± 0.47	71.0 ± 1.35	25.27 ± 0.26	27.8 ± 0.74	17.71 ± 0.32	49.4 ± 0.92
	TP	mg/L	12	2.39 ± 0.26	80.1 ± 2.20	7.39 ± 0.20	38.4 ± 1.66	3.30 ± 0.16	72.4 ± 1.32
	TSS	mg/L	1,800	557.11 ± 70.88	69.0 ± 3.94	683.11 ± 48.98	62.0 ± 2.72	966.44 ± 68.04	46.3 ± 3.78
	pH		7.50	6.87 ± 0.07	–	6.14 ± 0.08	–	7.41 ± 0.10	–
Week 3	BOD	mg/L	3,200	1096.6 ± 109.32	65.7 ± 3.42	1550.0 ± 103.11	51.5 ± 3.22	1166.6 ± 60.83	63.5 ± 1.90
	COD	mg/L	7,500	2309.6 ± 303.38	69.2 ± 4.05	5085.8 ± 362.04	32.1 ± 4.83	3709.1 ± 445.70	50.5 ± 5.94
	NH4+-N	mg/L	3.85	1.02 ± 0.10	73.4 ± 2.63	3.11 ± 0.07	19.1 ± 1.76	1.88 ± 0.05	51.1 ± 1.41
	NO3−-N	mg/L	20	5.31 ± 0.25	73.4 ± 1.23	12.18 ± 0.37	39.0 ± 1.86	9.99 ± 0.42	50.0 ± 2.08
	OP	mg/L	2.93	0.39 ± 0.03	86.7 ± 0.91	2.34 ± 0.07	20.0 ± 2.33	1.29 ± 0.07	56.0 ± 2.36
	TDS	mg/L	2,000	487.11 ± 23.85	75.6 ± 1.19	1552.7 ± 17.56	22.3 ± 0.88	1093.3 ± 51.07	45.3 ± 2.55
	TN	mg/L	35	8.87 ± 0.33	74.6 ± 0.95	25.17 ± 0.27	28.1 ± 0.78	16.93 ± 0.47	51.6 ± 1.33
	TP	mg/L	12	2.50 ± 0.10	79.1 ± 0.83	7.64 ± 0.21	36.3 ± 1.74	3.60 ± 0.12	70.0 ± 1.02
	TSS	mg/L	1,800	492.22 ± 21.99	72.6 ± 1.22	751.33 ± 144.71	58.2 ± 8.04	999.56 ± 92.51	44.4 ± 5.14
	pH		7.50	7.62 ± 0.04	–	6.02 ± 0.05	–	7.54 ± 0.05	–
Week 4	BOD	mg/L	3,200	1000.0 ± 76.49	68.7 ± 2.39	1646.6 ± 116.14	48.5 ± 3.63	1348.8 ± 151.36	57.8 ± 4.73
	COD	mg/L	7,500	2400.7 ± 251.41	67.9 ± 3.35	4608.0 ± 499.04	33.8 ± 4.78	3538.4 ± 491.39	52.8 ± 6.55
	NH4+-N	mg/L	3.85	1.12 ± 0.09	70.8 ± 2.26	3.14 ± 0.11	18.4 ± 2.79	1.84 ± 0.03	52.2 ± 0.89
	NO3−-N	mg/L	20	5.97 ± 0.29	70.1 ± 1.47	12.20 ± 0.38	39.0 ± 1.89	10.46 ± 0.39	47.7 ± 1.96
	OP	mg/L	2.93	2.57 ± 0.11	85.5 ± 1.94	2.37 ± 0.14	19.1 ± 4.67	1.29 ± 0.09	56.0 ± 3.10
	TDS	mg/L	2,000	521.89 ± 31.93	73.9 ± 1.60	1,510 ± 14.69	24.4 ± 0.73	1105.5 ± 35.13	44.7 ± 1.76
	TN	mg/L	35	10.84 ± 0.17	69.03 ± 0.49	26.32 ± 0.31	24.80 ± 0.89	18.60 ± 0.44	46.87 ± 1.26
	TP	mg/L	12	2.91 ± 0.35	75.71 ± 2.93	7.61 ± 0.15	36.61 ± 1.29	3.68 ± 0.22	69.36 ± 1.86
	TSS	mg/L	1,800	536.22 ± 38.88	70.21 ± 2.16	671.56 ± 42.28	62.69 ± 2.35	1059.11 ± 116.20	41.16 ± 6.46
	pH		7.50	7.66 ± 0.05	–	5.91 ± 0.05	–	7.59 ± 0.02	–