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Effect of various redox conditions on anaerobic biodegradation of 1,2 – dichloroethane by sungai ular sediment Siti Najiah Binti Ahmad Subkey

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Siti Najiah Binti Ahmad Subkey [author.]

Material type: Text

text

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unmediated

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volume

ISBN:

THE0010642 (Local)

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Dissertation note: Final Year Report (Bachelor of Chemical Engineering ) -- Universiti Malaysia Pahang Al-Sultan Abdullah - 2024 Abstract: Chlorinated compounds are serious environmental contaminants due to their high toxicity, which is harmful to human health and the environment when present in groundwater and soil. 1,2- dichloroethane (1,2-DCA) was an example of a chlorinated compound that was usually used in industry. Anaerobic biodegradation is a cost-effective and efficient method for remediating chlorinated sediments because it converts toxic compounds into non-toxic byproducts via organohalide respiring bacteria (OHRB). On the other hand, redox conditions such as iron and nitrate reduction will increase the metabolic activity and growth of OHRB, resulting in faster biodegradation of 1,2-DCA while sulphate reducing bacteria may be unfavorable to OHRB bacteria because they compete for hydrogen. The aim of this study was to investigate the effect of different redox conditions on 1,2-DCA degradation by OHRB in Sungai Ular sediment. The degradation of 1,2-DCA were tested under different redox conditions such as nitrate reducing, iron reducing and sulfate reducing with three different concentrations of the respective compounds. The 1,2-DCA was added to a nominal concentration of 100 μM. The concentration of redox condition was varied to observe the biodegradation rate of 1,2-DCA. The results showed that the highest biodegradation rates for nitrate, sulphate, and iron reducing conditions were achieved at 2 mM (82.78%), 1 mM (81.52%), and 10 mM (91.65%), respectively. The results of this study demonstrate that OHRB in the Sungai Ular sediment can degrade 1,2-DCA under any redox condition but prefers a certain concentration. Keywords: Chlorinated compounds; Biodegradation; Organohalide Respiring Bacteria; Redox; 1,2-Dichloroethane

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Item type	Current library	Call number	Status	Date due	Barcode
Final Year Report	UMPLIB GAMBANG	FTKKP .N35 2024 r Bc. (Browse shelf(Opens below))	Not for loan		T000004185

Faculty of Chemical and Process Engineering Technology

Final Year Report (Bachelor of Chemical Engineering ) -- Universiti Malaysia Pahang Al-Sultan Abdullah - 2024

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Chlorinated compounds are serious environmental contaminants due to their high toxicity, which is harmful to human health and the environment when present in groundwater and soil. 1,2- dichloroethane (1,2-DCA) was an example of a chlorinated compound that was usually used in industry. Anaerobic biodegradation is a cost-effective and efficient method for remediating chlorinated sediments because it converts toxic compounds into non-toxic byproducts via organohalide respiring bacteria (OHRB). On the other hand, redox conditions such as iron and nitrate reduction will increase the metabolic activity and growth of OHRB, resulting in faster biodegradation of 1,2-DCA while sulphate reducing bacteria may be unfavorable to OHRB bacteria because they compete for hydrogen. The aim of this study was to investigate the effect of different redox conditions on 1,2-DCA degradation by OHRB in Sungai Ular sediment. The degradation of 1,2-DCA were tested under different redox conditions such as nitrate reducing, iron reducing and sulfate reducing with three different concentrations of the respective compounds. The 1,2-DCA was added to a nominal concentration of 100 μM. The concentration of redox condition was varied to observe the biodegradation rate of 1,2-DCA. The results showed that the highest biodegradation rates for nitrate, sulphate, and iron reducing conditions were achieved at 2 mM (82.78%), 1 mM (81.52%), and 10 mM (91.65%), respectively. The results of this study demonstrate that OHRB in the Sungai Ular sediment can degrade 1,2-DCA under any redox condition but prefers a certain concentration. Keywords: Chlorinated compounds; Biodegradation; Organohalide Respiring Bacteria; Redox; 1,2-Dichloroethane