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Adsorption treatment of monoethanolamine (MEA) wastewater from oil and gas industry / Mohd Najib Razali

By:

Mohd Najib Razali

Material type: Text

TextPublication details: Kuantan, Pahang : UMP, 2011Description: xiv, 141 p. : ill. (some col.) ; 30 cm. + 1 CD-ROMISBN:

THE0003840(Local)
THE0003840(Local)

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Library access only

Dissertation note: Thesis (Master of Engineering (Chemical Engineering)) -- Universiti Malaysia Pahang - 2011 Abstract: Monoethanolamine (MEA) is commonly used in oil and gas industry as absorption medium to remove carbon dioxide (CO2) from gaseous stream. Upon usage, the MEA solution is contaminated with hydrocarbon and suspended solids. Heavily contaminated MEA solution reduces its effectiveness in stripping the CO2 gas and also causes foaming phenomenon in the CO2 removal unit which further reduces the overall performance of the unit. There are many instances in which during operation, the solution overshoot and mix with condensed water in the knock-out drum. At this point, all the solution (the contaminated solution and the condensed water) is discharged as wastewater and replaced with fresh solution. It is common, in the range of 60 – 80 tons of MEA wastewater is generated per month. This study was conducted to examine the best method of treating the MEA wastewater for the best interest of the company. Characterization of the MEA wastewater suggested that the most rational way of treating the wastewater was to achieve quality suited for the purpose of recycling it back into the system. Adsorption method was used for the treatment with four different types of adsorbent, namely chitosan, activated carbon, alum and zeolite, were investigated. Five different variables, namely adsorbent dosage, pH, temperature, mixing time and mixing speed were varied to examine the effect on the parameters such as percentage of residue oil, suspended solids, MEA concentration and COD level. The results showed that chitosan was the best adsorbent in treating the MEA wastewater, followed by activated carbon, alum and zeolite. Adsorbent dosage was the main variable affecting the performance of the adsorbent in removing the residue oil, suspended solids and reducing the COD level. Chitosan indicated two mechanisms of adsorption in treating the MEA wastewater, in which at low adsorbent dosage chitosan functioned through chemical adsorption, while at high dosage, electrostatic adsorption started to accompany. In all adsorbents investigated in this study, MEA concentration was not affected by the adsorption treatment.

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Holdings ( 4 )
Title notes ( 3 )

Holdings
Item type	Current library	Call number	Copy number	Status	Notes	Barcode
Thesis	UMPLIB GAMBANG	TP156.A35 N35 2011 rs Thesis (Browse shelf(Opens below))	1	Not for loan		0000063426
Thesis	UMPLIB GAMBANG	CD 5979 \| TP156.A35 N35 2011 rs Thesis (Browse shelf(Opens below))	1	Not for loan		0000063427
Thesis	UMPLIB GAMBANG	CD 5989 \| TP156.A35 N35 2011 rs Thesis (Browse shelf(Opens below))	2	Not for loan	c.2	0000063451
Thesis	UMPLIB GAMBANG	TP156.A35 N35 2011 rs Thesis (Browse shelf(Opens below))	2	Not for loan	c.2	0000063450

Thesis (Master of Engineering (Chemical Engineering)) -- Universiti Malaysia Pahang - 2011

Bibliography : p. 112-121

Monoethanolamine (MEA) is commonly used in oil and gas industry as absorption medium to remove carbon dioxide (CO2) from gaseous stream. Upon usage, the MEA solution is contaminated with hydrocarbon and suspended solids. Heavily contaminated MEA solution reduces its effectiveness in stripping the CO2 gas and also causes foaming phenomenon in the CO2 removal unit which further reduces the overall performance of the unit. There are many instances in which during operation, the solution overshoot and mix with condensed water in the knock-out drum. At this point, all the solution (the contaminated solution and the condensed water) is discharged as wastewater and replaced with fresh solution. It is common, in the range of 60 – 80 tons of MEA wastewater is generated per month. This study was conducted to examine the best method of treating the MEA wastewater for the best interest of the company. Characterization of the MEA wastewater suggested that the most rational way of treating the wastewater was to achieve quality suited for the purpose of recycling it back into the system. Adsorption method was used for the treatment with four different types of adsorbent, namely chitosan, activated carbon, alum and zeolite, were investigated. Five different variables, namely adsorbent dosage, pH, temperature, mixing time and mixing speed were varied to examine the effect on the parameters such as percentage of residue oil, suspended solids, MEA concentration and COD level. The results showed that chitosan was the best adsorbent in treating the MEA wastewater, followed by activated carbon, alum and zeolite. Adsorbent dosage was the main variable affecting the performance of the adsorbent in removing the residue oil, suspended solids and reducing the COD level. Chitosan indicated two mechanisms of adsorption in treating the MEA wastewater, in which at low adsorbent dosage chitosan functioned through chemical adsorption, while at high dosage, electrostatic adsorption started to accompany. In all adsorbents investigated in this study, MEA concentration was not affected by the adsorption treatment.