Farhana ABD Lahin (2014) Removal of pollutants in ammonia rich synthetic wastewater using Microalgae membrane bioreactor. Masters thesis, Universiti Malaysia Sabah.
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Abstract
An ammonia-urea fertilizer plant with 1.2 million tons of annual production capacity is to be opened in Sabah commencing in 2015. The discharge from this ammoniaurea fertilizer plant will impose a threat to Sabah’s natural aquatic ecosystem. An alternative treatment for ammonia-urea fertilizer plant wastewater was researched by using microalgae to utilize the nutrient content and to provide microalgae biomass for other industrial usage. Locally isolated microalgae of Chlorella sp., Scenedesmus dimorphus and Scnedesmus quadricauda were compared in their nutrient removal rate. Chlorella sp. displayed highest performance (>55% of NH3, >15% of PO4 3-) after 3 days operation and therefore was incorporated in the microalgae membrane bioreactor treatment system. Sample with high concentration and low concentration were used and two retention time (RT) were applied (2 and 3 days RT). Results show that microalgae are preferable to low concentration (>80% of NH3, >20% of PO4 3-) compared to the high concentration wastewater feed (<30% of NH3, <20% of PO4 3-) for both RT. The highest efficiency was achieved in operation with low concentration wastewater sample in 2 days RT (81.9% of NH3 and 25.5% of PO4 3- removal). Ultrafiltration membrane was able to simultaneously remove the chemical oxygen demand (COD) (<12 mg/L for low concentration feed) and biological oxygen demand (BOD) (<5 mg/L for low concentration feed) content in the effluent. Low turbidity reading (<6 Fau) was also recorded for all permeate samples. A highest biomass growth rate of 0.512 x 106 cell/mL.day for high concentration sample in batch operation and 0.681 x 106 cell/mL.day for the 2 days RT with low concentration feed were attained, showing a high volume biomass production was not achieved.
| Item Type: | Thesis (Masters) |
|---|---|
| Keyword: | Ammonia-urea fertilizer plant, Wastewater treatment, Microalgae, Chlorella sp., Scenedesmus dimorphus, Scenedesmus quadricauda, Nutrient removal |
| Department: | SCHOOL > School of Engineering and Information Technology |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 11 Mar 2025 10:45 |
| Last Modified: | 11 Mar 2025 10:45 |
| URI: | https://eprints.ums.edu.my/id/eprint/43104 |
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