Removal of nitrogen and phosphorus from waste stabilization pond effluents using aerated blast-furnace-slag filters

Hamdan, Rafidah and Mara, D.D. (2014) Removal of nitrogen and phosphorus from waste stabilization pond effluents using aerated blast-furnace-slag filters. WIT Transaction on Engineering Sciences, 8 . ISSN 1743-3533


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Rock filter (FW) system emerged as one of the well established alternative methods for polishing lagoon and pond effluents. However, the use of RF to remove nutrients, such as nitrogen (N) and phosphorus (P), is very limited. Therefore, the present study was carried out to investigate the performance of aerated FW (ARF) systems for removing both nitrogen and phosphorus from domestic wastewater using blast furnace slag (BFS) as the filter medium. The performance of two aerated BFS filter systems, an aerated horizontal-flow BFS filter and an aerated vertical up-flow BFS filter, have been monitored and were compared: for N and P removals. A further aim of the study was to determine if either or both of these aerated BFS filter systems could produce effluents which complied with the nutrient removal requirements of the EU Urban Waste Water Treatment Directive (UWWTD) (91/271/EEC) for small communities. From the results of the present study it can be concluded that the both aerated BFS filter systems are suitable unit processes for removing ammonium-N and P from primary facultative pond effluents as the systems were able to produce high effluent quality to levels below the EU UWWTD maximum permissible limit. The aerated vertical-upflow BFS filter has the advantage of removing more ammonium-N (to below 1 mg NIL), but the disadvantage of removing less total- N. Further research on optimizing the design and performance of both aerated BFS filter systems are warranted, and their performance in warm-climate countries requires to be investigated.

Item Type:Article
Uncontrolled Keywords:aerated rock filter; nitrogen; phosphorus; blast furnace slag
Subjects:T Technology > TD Environmental technology. Sanitary engineering > TD201-500 Water supply for domestic and industrial purposes
Divisions:Faculty of Engineering Technology > Department of Civil Engineering Technology
ID Code:5840
Deposited By:Normajihan Abd. Rahman
Deposited On:03 Nov 2014 14:40
Last Modified:03 Nov 2014 14:40

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