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Title: Enhanced biological phosphorus removal from wastewater in the tropics
Authors: Cokro, Angel Anisa
Keywords: DRNTU::Engineering::Environmental engineering::Water treatment
Issue Date: 2018
Source: Cokro, A. A. (2018). Enhanced biological phosphorus removal from wastewater in the tropics. Doctoral thesis, Nanyang Technological University, Singapore.
Abstract: Enhanced Biological Phosphorus Removal (EBPR) is a phosphors (P) removal method that utilizes the capacity of Polyphosphate Accumulating Organisms (PAOs) to store P more than what is needed for growth. Conventionally, warm temperatures are thought to adversely affect EBPR, while presence of anaerobic stage with distinct separation of carbon and electron acceptors is considered fundamental for successful EBPR. However, recent findings have challenged these paradigms. This dissertation investigated EBPR at warm temperatures when carbon like volatile fatty acids (VFAs) and electron acceptors (e.g. nitrate and/or nitrite) were concomitantly present. Additionally, this thesis also explored a potential strategy to resuscitate failing EBPR systems at warm temperature via addition of wasted activated sludge (WAS). This dissertation showed that non-denitrifying PAOs (non-DPAOs), a group of PAOs that cannot use nitrate and/or nitrite as electron acceptors could carry out EBPR despite the simultaneous presence of carbon and nitrate/nitrite, potentially eliminated the needs for anaerobic stage. However, long term stability of anoxic/aerobic EBPR at warm temperature was influenced by proliferation of non-PAO organisms like certain types of Glycogen Accumulating Organisms (GAOs) or heterotrophic denitrifiers that could compete for carbon. Additionally, WAS addition showed promising potential to be developed as cheap alternative to resuscitate deteriorating EBPR systems.
DOI: 10.32657/10356/75924
Schools: School of Civil and Environmental Engineering 
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Theses

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