Date of Award
Master of Science (MS)
Civil and Environmental Engineering
Dr. Ashraf Aly Hassan
Dr. Mohamed Hamouda
Produced water (PW) is the effluent generated during oil mining and extraction. On average, for every barrel of oil, 4 - 5 barrels of PW are generated worldwide. In UAE, 1.22 billion cubic meters of PW were generated in the year 2017. Proper management of PW is thus very important taking into account the large volumes of it being generated. In addition, PW is considered toxic as it contains various contaminants such as aliphatic and aromatic hydrocarbons, inorganic salts, metals, phenols, radioactive materials, and chemical additives. Disposal of untreated PW into oceans and water bodies can cause adverse effects on human health and the environment. Therefore, proper treatment is required before reuse or disposal. The currently used methods of treatment include physical and chemical treatments that are expensive and increase the overall cost of the oil product. Biological treatments are, therefore, recommended as an economical alternative. Microalgae can utilize contaminants in the PW as nutrient sources and thus be used for bioremediation. In this study, microalgae enriched and grown in wastewater were acclimatized to three different produced water samples, obtained from different geographical regions, one being onshore and the other two being offshore. Acclimatization was attained following progressive adaptation in a steadily increasing ratio of produced water. The algae which could adapt and grow in the highest ratio in minimum time was used for bioremediation of produced water at a concentration of 6.25% (v/v). The microscopic examination revealed that the dominant species were Chlorella. Treatment was done in batch reactors for seven days. Treatment efficiency was examined by measuring parameters such as pH, COD, TOC, conductivity, salinity, TDS, anions, and alkalinity. COD removal between 22 - 44% and TOC between 4 - 25% were achieved. A reduction of 12 - 18% of EC, 12 - 20% TDS, 13 - 22% salinity, 16 - 25% chloride ion concentration and an increase of 78 - 85% alkalinity were observed in the three produced water samples over a 7-day treatment period.
Nadersha, Shibin, "BIOLOGICAL TREATMENT OF PRODUCED WATER USING ALGAE: A PROOF OF CONCEPT" (2021). Theses. 883.