Formation and Characteristics of Aerobic Granular Sludge for Simultaneous Phosphorus and Nitrogen Removal in a SBR

Abstract:

With inoculum sludge from a conventional activated sludge wastewater treatment plant, formation of aerobic granular sludge for simultaneous phosphorus and nitrogen removal was realized in a sequencing batch reactor by the selective pressure as a driving force. Selective pressure created by means of decreasing sedimentation time and increasing substrate loading enhanced the formation of aerobic granular sludge, which followed four consecutive stages: acclimation, granulation, growth and maturation. Under the condition that the substrate loading were increased to 500mg COD/(L•d) and 48mg NH₄ ⁺-N/(L•d), the granules were the dominant sludge forms with most of diameter about 0.5–2.0 mm, a minimal settling velocity of 0.55 cm/s and a MLSS of 6800 mg/L after 120 days operation. The granules were composed of filamentous species with varying degrees of rod- and coccal-type bacteria. Microscopic examination revealed that granules microecosystem was more stable and should be less vulnerable to the changes of mixed liquor condition.

• Periodical: Advanced Materials Research (Volumes 356-360)
• Pages: 1630-1636
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.356-360.1630
• Online since: October 2011
• Authors: Guo Jing Yang, Xiao Ming Li, Qi Yang, Kun Luo
• Keywords: Aerobic Granular Sludge, Formation, Selective Pressure, Sequencing Batch Reactor (SBR)

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