Table 1 Concentrations of soluble cations and anions in wastewater collected from each treatment unit.

142.0^a ± 7.7

115.0^b ± 5.8

108.0^b ± 4.3

100.0^c ± 4.8

90.0^d ± 3.8

400

33.6^a ± 1.4

32.7^a ± 1.2

24.4^b ± 1.4

23.8^b ± 1.1

23.4^b ± 0.9

5

121.3^a ± 8

120.4^a ± 7.1

85. 7^b ± 4.5

83.5^b ± 5.1

92.4^b ± 5.0

60

829.0^a ± 41.8

820.0^a ± 38.7

612.0^c ± 28.6

558.0^c ± 29.7

736.0^b ± 26.8

920

2.8^a ± 0.17

2.1^b ± 0.16

1.4^c ± 0.08

0.1^e ± 0.01

1.1^d ± 0.05

5

488.0^a ± 20

440.0^b ± 20

439.0^b ± 15

414.0^bc ± 8

400.0^c ± 9

610

1092.0^a ± 52

1090.0^a ± 51

1123.0^a ± 48

1056.2^a ± 32

1060.9^a ± 29

1065

1.8^a ± 0.06

1. 8^a ± 0.08

1.8^a ± 0.07

0.2^c ± 0.01

1.2^b ± 0.08

10

1.3^a ± 0.15

0.8^b ± 0.1

0.6^c ± 0.07

0.2^d ± 0.008

0.2^d ± 0.04

2

319.7^a ± 18.9

293.4^bc ± 17.6

288.9^c ± 15.8

309.4^ab ± 16.7

221.4^d ± 13.5

960