52
3.3.9 MLSS Mixed liquor suspended solid
MLSS was measured using a HACH turbidimeter based on this calibration curve prepared using the seed sludge: Turbidity NTU = 0.6618[MLSS]
– 1.964, with coefficient of correlation R
2
= 0.9988.
3.3.10 NH
3
Ammonia NH
3
was measured using ion selective electrode for dissolved ammonia Sens ion 4. This ammonia meter was calibrated every week. 25 ml sample
was collected and after added with ionic strength adjustor the measurement was performed.
CHAPTER 4 RESULT AND DISCUSSION
4.1 Treatability studies with Fenton’s reagent.
Oxidation of an organic compound by Fenton’s reagent occurs in the acidic
pH range. The oxidation rate is controlled by the generation rate of HO• radicals. The
rate of HO• radical production in turn depends upon the H
2
O
2
concentration, FeSO
4
, and the competing reactions. These competing reactions may also be responsible for
loss of the oxidation power in the system by a series of side reaction Laat and Gallard, 1999. Equations 2.1 till equation 2.6 describe the major reactions in the
Fenton’s oxidation. While the equation 2.7 till equation 2.9 explain the competing reactions. In this study, relatively mild conditions of Fenton treatment were selected
to enhance biodegradability of MEA and DEA. The effects of initial concentration of alkanaolamine, pH, concentration of H
2
O
2
, and concentration of FeSO
4
were studied separately. The ranges of values of these variables performed in the experiment are:
1 MEA concentration: 800 – 16000 ppm; pH: 2 – 5; H
2
O
2
: 50 – 250 ml 30 ww
in 800 ml solution and FeSO
4
;7H
2
O: 4 – 16 gram in 800 ml solution. 2 DEA
concentration: 800 – 16000 ppm; pH: 1 – 4; H
2
O
2
: 50 – 250 ml 30 ww in 800 ml
solution and FeSO
4
;7H
2
O: 4 – 16 gram in 800 ml solution.
4.1.1 Effect of Initial Concentration
The study of the effect of initial alkanolamine concentration was performed at four initial concentrations of alkanolamine. The concentration was varied from 800
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