Abstract
This study investigated the ability to upgrade the biological treatment system in Zenin wastewater treatment plant, in Egypt. This investigation was conducted through the comparison of three different biological treatment systems: activated sludge process (AS), moving bed biofilm reactor (MBBR), and integrated fixed film activated sludge system (IFAS). Three pilot systems were established at Zenin wastewater treatment plant, to simulate AS, MBBR, and IFAS systems, to show the effect of various parameters on the removal efficiencies of biochemical oxygen demand (BOD 5 ), total suspended solids (TSS), and ammonium-nitrogen (NH 4 -N). Different values of hydraulic retention time, different amounts of returned sludge, and concentration of dissolved oxygen, were examined. The maximum removal efficiencies of BOD 5 , TSS, and NH 4 -N were 50%, 81.9%, and 82% in activated sludge system, respectively; 80%, 81.8%, and 99.3% in MBBR system, respectively; and 62.3%, 86.2%, and 76% in IFAS system, respectively. Keywords: Attached growth; Hybrid growth; Sludge; Suspended growth; Wastewater DOI : 10.7176/CER/11-1-05
Highlights
Municipal wastewater in general is comprised of water (99.9%) together with relatively small concentrations of suspended and dissolved organic and inorganic solids (Metcalf and Eddy, 2014)
In integrated fixed film activated sludge system (IFAS) system, the removal of BOD5 decreased with increasing the value of the returned sludge
In activated sludge process (AS) system, the removal of BOD5 decreased with increasing the value of the returned sludge
Summary
Municipal wastewater in general is comprised of water (99.9%) together with relatively small concentrations of suspended and dissolved organic and inorganic solids (Metcalf and Eddy, 2014). The flow enters a settling tank for two to three hours to remove suspended particles, and that after the passage of wastewater through screens and grit removal chambers which represent the preliminary treatment. In these two stages, about 40% of the dissolved organic matter and 60% of the suspended solids can be eliminated. A final treatment stage is performed to further improve the effluent quality before it is discharged to the receiving environment This can be achieved through several methods such as adsorption, electrocoagulation, etc Several parameters affect the performance of these systems (Bhatia et al, 2017; Lopez-Lopez et al, 2012; Mannina et al, 2018; Ødegaard et al, 2000; Sriwiriyarat et al, 2008)
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