In-sewer processes wastewater quality change under anoxic condition / Mohd Feaidzal Sulaiman

Wastewater composition is generally divided into biodegradable chemical oxygen demand (COD), non-biodegradable COD and heterotrophic active biomass. Changes in composition of COD fractions are currently used as measures of wastewater quality changes. Transportation time in sewers will effect the quality of wastewater due to microbial transformations under aerobic, anoxic or anaerobic. The objective of this project is to investigate wastewater quality changes under anoxic conditions. The study will focus on changes in the bulkwater phase of municipal wastewater. Since anoxic conditions do not exist naturally, sodium nitrate will be used to create anoxic conditions in this study. Tests were conducted on 7 different wastewater samples from the wastewater treatment plant (WWTP) at Section 23, Shah Alam. Changes in electron acceptor (nitrate) will be monitored in an anoxic reactor, while changes in electron donor (organic carbon) will be monitored in an aerobic reactor. The changes in COD-fraction will give the wastewater quality change under anoxic condition. KEYWORDS: COD fractions, In-sewer process, nitrate utilization rate, oxygen utilization rate and wastewater quality changes