Evaluating Penitential of “SUPHE” Soil as A Coagulating Agent in Primary Treatment of Asella Malt Factory Wastewater
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Date
2018-10
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Addis Ababa University
Abstract
Malt industries generate large amounts of wastewater effluent which contains a high concentration
of biodegradable and non-biodegradable organic compounds which are poisonous to the
environment and to eco system if discharged untreated. In this study, treatment performance of
“Suphe” soil was evaluated first by treating composite malting waste water samples collected from
different stages of production process at three different doses which were, 50mg/l, 500mg/l,
1000mg/l of “Suphe” soil in order to remove COD, BOD, TSS, then it was followed by adjusting the
pH of waste water at acidic (pH 5), neutral (pH 7) and basic (pH9) medias. Sodium Hydroxide
(NaOH) 0.1N and Sulfuric acid (H
2
SO
4
) 0.1 N were used for adjusting the pH at the desired levels
and the removal efficiency of “Suphe” soil was best recorded at pH of 7 and coagulant dose of 50
mg/l. Design-Expert 7.0.0 three-level-three-factor Box-Bhenken Design (BBD) was applied for
experimental design and statistical analysis of results. Coagulant dose, pH of wastewater, and
settling time had a significant effect on treatment process of malting wastewater samples process.
For this treatment system, a set of experiments was performed to investigate removal of COD, BOD
and TSS at different experimental phases. From these analyses, Results on overall efficiency had
COD and BOD removal performance of 94.3% and 94.4 % for the first wet steep; 97.7%and 97.1%
for the second wet steep and 96.3% and 96.1% for the composite treated effluent respectively.
Andthe turbidity removal efficiency of the “Suphe” soil coagulant was 98.76%, 99% and 99.83%
respectively for first wet steep, second wet steep and finally treated composite effluent at coagulant
dose of 50 mg/l and pH of 7 On the other hand at the same pH level in which “suphe” soil was used,
Alum turbidity removal efficiency was 96.2%, 96.6%and 99.4% respectively as mentioned above.
Therefore, “Suphe” soil is found to lay a significant malting wastewater pretreatment agent which
has the potential to replace the hydrated aluminum sulphate.
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Keywords
Biodegradable, wastewater, Suphe‖ soil, coagulant, malting