Month | UASB influent concentration (mean ± SD) | UASB effluent concentration (mean ± SD) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
TSS | COD | TN | TP | PO43− | TSS | COD | TN | TP | PO43− | |
Jan | 652 ± 3 | 2866 ± 20.8 | 122 ± 3 | 46.9 ± 1.2 | 36.9 ± 1.5 | 274.4 ± 12 (57.9) | 614 ± 5.3 (78.6) | 101.4 ± 3 (16.9) | 32.5 ± 2.4 (30.7) | 25 ± 1.4 (32.2) |
Feb | 642 ± 1.5 | 2663.3 ± 58.6 | 102.7 ± 1.5 | 45.3 ± 3.2 | 32.4 ± 1.1 | 263.7 ± 5.4 (58.9) | 545.7 ± 10 (79.5) | 77.4 ± 2.2 (24.1) | 28.4 ± 1 (37.3) | 20.6 ± 0.4 (36.4) |
Mar | 492.7 ± 2.3 | 1210 ± 30 | 84.9 ± 2.3 | 39.4 ± 3 | 24.8 ± 1 | 180.2 ± 1.2 (63.4) | 338.7 ± 10 (72) | 43.6 ± 3.2 (48.6) | 25.4 ± 2.4 (34.5) | 17.3 ± 0.9 (30.2) |
Apr | 552.7 ± 3.2 | 2260 ± 43.6 | 60.3 ± 3.2 | 44.8 ± 1.4 | 37.7 ± 2.8 | 256 ± 2 (53.7) | 443.7 ± 5.9 (80.4) | 38 ± 1.2(37) | 33.4 ± 2.9 (25.4) | 27.5 ± 1.2 (27.1) |
May | 437.7 ± 7.4 | 1056.7 ± 35.1 | 84.3 ± 7.4 | 58.4 ± 2.2 | 51.4 ± 5.1 | 210.9 ± 6.8 (51.8) | 278.2 ± 18 (73.7) | 57 ± 3.9(32.4) | 42.9 ± 2.9 (26.4) | 29.9 ± 1.6 (41.8) |
Jun | 530.3 ± 6 | 1884.3 ± 32 | 85.3 ± 6 | 41 ± 2 | 37.1 ± 1.2 | 212 ± 12 (60) | 350.2 ± 16 (81.4) | 63.3 ± 2.1(25.8) | 27.7 ± 2.1 (32.4) | 20.1 ± 1.6 (45.8) |
Jul | 576.7 ± 2 | 1432.7 ± 31.9 | 58 ± 2 | 44.8 ± 0.2 | 33 ± 0.3 | 184.3 ± 5.1 (68) | 207.3 ± 3.1 (85.5) | 29.4 ± 1(49.3) | 24.4 ± 3.4 (45.5) | 14.4 ± 1 (56.4) |
Aug | 452 ± 3.2 | 1915.7 ± 38.8 | 50.3 ± 3.2 | 29.7 ± 0.7 | 24.1 ± 1.2 | 123.7 ± 5.1 (72.6) | 334.5 ± 0.5 (82.5) | 25 ± 1.9(50.3) | 17.9 ± 3.1 (39.7) | 10.2 ± 0.3 (57.7) |
Sept | 567.3 ± 3.5 | 1360 ± 32.4 | 62.7 ± 3.5 | 60.1 ± 1 | 50.6 ± 1.2 | 239.3 ± 6.1 (57.8) | 383.3 ± 9.9 (71.8) | 32.8 ± 1.8 (47.7) | 41.7 ± 2 (30.6) | 32.9 ± 1.4 (35) |
Oct | 455.7 ± 3.2 | 2376.7 ± 41.6 | 71.7 ± 3.2 | 33.9 ± 1.6 | 26.9 ± 1.1 | 211.4 ± 2.1 (53.6) | 436 ± 2 (81.7) | 48.6 ± 7.2(32.2) | 23.2 ± 1 (31.6) | 19.6 ± 1.3 (27.1) |
Nov | 366 ± 4.9 | 1669 ± 3 | 64.3 ± 4.9 | 28.4 ± 1.1 | 21.9 ± 1.7 | 177.4 ± 12 (51.4) | 313 ± 2.6 (81.2) | 34.9 ± 4.6(45.7) | 20.3 ± 2.2 (28.5) | 12.6 ± 0.3 (41.1) |
Dec | 393.3 ± 2.7 | 1750 ± 18.7 | 88.3 ± 2.7 | 41.3 ± 2.6 | 32.5 ± 2.4 | 200.9 ± 7.4 (48.9) | 392.7 ± 3.5 (77.6) | 61.3 ± 2.1(30.6) | 29.4 ± 1.6 (28.8) | 22.6 ± 1.3 (31.1) |
p-value |  < 0.05 |  < 0.05 |  < 0.05 |  < 0.05 |  < 0.05 |  < 0.05 |  < 0.05 |  < 0.05 |  < 0.05 |  < 0.05 |