สมวรรณ ศรีเจริญ. Removal of Hydrogen Sulfide by Treated Palm Oil Mill Effluent as an Absorbent. Master's Degree(Chemical Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library.. : King Mongkut's University of Technology Thonburi, 2007.
Removal of Hydrogen Sulfide by Treated Palm Oil Mill Effluent as an Absorbent
Abstract:
H2S is pollutant which often contaminates in biogas. As the presence of H2S in biogas
causes the corrosion of engine and equipment, H2S should be removed prior to use. In
this work, the absorption was chosen with an alternative absorbent and packing media
in order to achieve simple operation and cost effective system. Therefore, the objective
of this project is to study the potential of using treated POME as H2S absorbent and
nylon net as packing media in H2S scrubber. There were four parts which needed to be
performed to achieve the objective. For the first part, characterization of pH, alkalinity,
COD, BOD, TKN, and total phosphate of treated POME were performed. COD, BOD,
TKN, and total phosphate indicated that the treated POME contained the less organic
sources. Moreover, pH and alkalinity of treated POME were high like general
chemicals. For the second part, the potential of using treated POME as the H2S removal
absorber was studied by comparing the H2S removal efficiency with tap water and the
NaOH solution. The experimental results show that the H2S removal efficiency of
treated POME was higher than that of tap water and was closed to the NaOH solution
(constant pH 8.75). The treated POME had high potential for using as an absorbent
because it provided the high H2S removal efficiency around more than 95 percent at the
gas flow rate of 0.75 l/min and also helped to save the chemical cost. For the third part,
the KGa correlation of treated POME was determined as the function of gas flow rate by
varying the gas flow rate between 0.75 to 2.25 l/min. The experimental values of KGa
were found to vary from 1.44x10-6 kmol S-I m-3 kPa- 1 to 3.54x10-6 kmol S-I m-3 kPa-1
when varying the gas flow rate between 0.75 l/min and 2.25 l/min, respectively. From
this information, the KGA correlation of treated POME in form of gas flow can be
written as KGa = 5.597x10-3.13G0.7738 kmol S-1 m-3 kPa-l . Finally, the potential of using
nylon net as packing media was studied by comparing the H2S removal efficiency with
pall rings. It was found that the H2S removal performance of nylon net was slightly
lower than pall ring. As nylon net was available and low cost, it was possibly used as
packing media.