The use of C. zizanioides to treat fertilizer plant effluent resulted in the following changes: Sharp fall in pH from day 2 to day 4, with a 12 % increase in day 6. There was a continuous reduction in BOD from day 2, with a 10 % reduction from day 4 to day 6. There was no change in COD in day 2, but 56 % reduction in day 4 and 8 % reduction in day 6 were observed. Fe and Co showed a slight decrease in day 2 (25 % and 33 % respectively), but rapid reduction in day 4. Fe, Co and Cd were also below detectable limits in day 6 (Table 4).
When fertilizer effluent was treated with C. nigritanus, the following changes were observed; Slight change (4 to 8 % decrease) in pH from day 2 to 6, BOD was continuously reduced by 52 % in day 2 to 67 % in day 6, COD rapidly reduced in day 2 (54 %), but steady to day 6 with only a 4 % change. Fe was steadily reduced (7 to 80 %), while Co showed slow reduction in day 2 (11 %), and below detectable limits in day 4. Cd and As were also reduced below detectable limits in day 6 (Table 4).
T-cal values obtained from these parameters when treated with C. zizanioides and C. nigritanus are as follows: pH (1.073), BOD (-0.115), COD (-0.862), NO3- (-1.143), PO43- (-0.768), Zn (-2.482), Fe (-0.03), Co (1.000), Cd (1.000), Mn (1.056), As (1.000) (Table 5).
The results of the performance influence of Vetiver on wastewater from fertilizer plant are summarized in Table 4 below.
Table 4: Percentage reduction of pollutants from fertilizer effluent (WW1) treated with
C. zizanioides and C. nigritanus
|
PARAMETERS
|
DAY2 (%)
|
DAY4 (%)
|
DAY6
(%)
|
|||
|
C.
zizanioides
|
C. nigritanus
|
C. zizanioides
|
C. nigritanus
|
C. zizanioides
|
C. nigritanus
|
|
|
pH
|
44
|
4
|
7
|
8
|
19
|
16
|
|
BOD
|
51
|
52
|
63
|
68
|
72
|
67
|
|
COD
|
0
|
54
|
56
|
57
|
64
|
58
|
|
NO3-
|
52
|
54
|
77
|
84
|
93
|
92
|
|
PO43-
|
36
|
54
|
72
|
71
|
80
|
78
|
|
CN-
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
|
Pb
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
|
Zn
|
56
|
64
|
87
|
93
|
96
|
97
|
|
Fe
|
25
|
70
|
100
|
77
|
100
|
80
|
|
Co
|
33
|
11
|
100
|
100
|
100
|
100
|
|
Cd
|
60
|
45
|
100
|
100
|
100
|
100
|
|
Hg
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
|
Mn
|
60
|
50
|
77
|
65
|
85
|
90
|
|
As
|
60
|
45
|
100
|
100
|
100
|
100
|
|
Ni
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
|
Cu
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
bdl
|
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