Evaluation Of Copper Removal Using MIRHA
As An Adsorbent In A Continuous Flow Activated
Sludge System
Author(s)
S. R. M. Kutty, E. H. Ezechi, S. G. Khaw, C. L. Lai & M. H. Isa
Abstract
The efficiency of copper removal from an aqueous solution was investigated in a
continuous flow activated sludge system. Two identical biological reactors made
of acrylic were used to carry out the research. Reactor one (R1) was used as
control and contained only biomass. Reactor two (R2) contained biomass and
microwave incinerated rice husk ash (MIRHA). Different concentrations of
copper dosages in the range of 0.5 mg/L, 1 mg/L, 2 mg/L, 5 mg/L, 10 mg/L and
15 mg/L were used. Activated sludge was allowed an acclimatization time of 15
days in both reactors. Microwave incinerated rice husk ash (MIRHA) was then
added to reactor two (R2) from day 16. It was allowed to acclimatize with
the activated sludge until day 25. The reactors were subsequently fed with an
aqueous solution containing copper of various doses from day 26 onwards. The
results show that the effluents from both reactor one (R1) and reactor two (R2)
have a minimum removal efficiency of about 86% for all the copper doses
investigated. The maximum average copper removal efficiency for reactor one
(R1) and reactor two (R2) is 93% and 97% respectively. Reactor two (R2) had
higher copper removal efficiency for all the concentrations investigated. The
mixed liquor suspended solids (MLSS) and mixed liquor volatile suspended
solids (MLVSS) of reactor two (R2) significantly increased from phase 2 to
phase 6 whereas in reactor one (R1), mixed liquor suspended solids (MLSS) and
mixed liquor volatile suspended solids (MLVSS) stabilized from phase 2 to
phase 4. This implies that using microwave incinerated rice husk ash (MIRHA)
as an adsorbent in an activated sludge system can increase the reactor
performance.
Keywords: activated sludge, copper, microwave incinerated rice husk ash
(MIRHA).
Keywords
activated sludge, copper, microwave incinerated rice husk ash(MIRHA).
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