Wednesday, 18 January 2017

Effect of Vetiver on Fertilizer Plant Effluent.

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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