Tuesday, 17 January 2017

Effect of Vetiver on Crude oil Polluted Water

The following results were obtained when 5 % crude oil water was treated with C. zizanioides: pH was relatively unchanged in day 2 but slightly reduced (12 %) in day 6. BOD, COD, PO43-, CN-, Pb, Fe and Mn were continuously reduced from day 2 (Figure 12) until day 6, with an average of 77 %, 79 %, 70 %, 83 %, 76 %, 83 % and 55 % respectively. Fe was below detectable limits in day 4 and 6.
When treated with C. nigritanus, the following observations
were made: Fe was below detectable limits in day 2, while pH was relatively unchanged. BOD, COD, NO3-, PO43-, CN-, Pb, Fe, Mn continuously reduced by 98 %, 80 %, 71 %, 67 %, 82 %, 74 %, 100 % and 61 % respectively  from day 2 to day 6 (Figure 13).
T-cal values obtained from these parameters when treated with C. zizanioides and C. nigritanus are as follows: pH (-1.942), BOD (-1.109), COD (-2.000), NO3- (-1.941), PO43- (1.525), CN- (0.378), Pb (0.354), Fe (-1.000), and Mn (-3.900) (Table 5).

Effect of Vetiver on Cassava mill Effluent

The following results were obtained when effluent from Cassava mill was treated with C. zizanioides: pH remained unchanged in day 2. BOD, COD, NO3-, PO43-, CN- , Pb, Fe, and Mn decreased continuously from day 2 (Figure 14) until day 6 with average reduction of 71 %, 80 %, 61 %, 60 %, 76 %, 71 %, 85 % and 82 % respectively. Highest reduction of CN was observed in day 4 (97 %), while, Zn and Fe were below detectable limits in day 6.
When C. nigritanus was used, the following results were obtained: pH decreased continuously from day 2 (32 %) to day 6 (64%). BOD, COD, NO3-, PO43-, CN-, Pb, Fe, and Mn also decreased continuously by 83 %, 80 %, 69 %, 74 %, 89 %, 77 %, 85 % and 67 % respectively from day 2 to day 6 (Figure 15). 

T-cal values obtained from these parameters when treated with C. zizanioides and C. nigritanus are as follows: pH (-0.429), BOD (-1.682), COD (0.054), NO3- (-0799), PO43- (-1.274), CN- (-0.901), Pb (-0.462), Zn (0.383), Fe (-0.094), and Mn (1.931) (Table 5). 

Parameters
Effluent from
Fertilizer plant
Effluent from
quarry site
Urban irrigation
water
Refuse dump
leachates
Effluent from
abattoir
Crude oil polluted
water
Cassava mill
effluent
pH
1.07
0.62
1.45
2.11
0.48
-1.94
-0.43
BOD
-0.12
1.18
0.55
1.73
0.66
-1.10
-1.68
COD
-0.86
-2.50
-1.22
-0.14
0.62
2.00
0.05
NO32-
-1.14
0.18
1.26
1.00
2.64
1.94
0.07
PO43-
0.77
-0.77
-0.49
3.17
-0.36
1.52
-1.27
CN
-
-
0.71
-0.19
1.89
0.38
-0.90
Pb
-
0.65
-
-
-
0.35
0.46
Zn
2.48
-1.00
1.89
0.62
-1.00
-
0.38
Fe
-0.03
2.23
0.44
0.23
-0.83
1.00
-0.09
Co
1.00
-1.00
1.00
1.00
-
-
1.93
Cd
1.00
-
-
-
-0.61
-
-
Hg
-
-
-
-
-
-
-
Mn
1.06
0.08
0.99
-
-
-3.90
-
As
1.00
0.86
1.96
-
-
-
-
Ni
-
-
-
-
-
-
-
Cu
-
-
-
-
-
-
-

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