Cultivation of aerobic granular sludge coupled with built-in biochemical cycle galvanic-cells driven by dual selective pressure and its denitrification characteristics

Aerobic granules were cultivated in the sequencing batch reactor at 15-25°C, pH 7.0 ± 0.1. Settling time decreased from 5 minutes to 1 minute gradually. As increasing the chemical oxygen demand (COD) and NH3-N in influent, COD removal efficiency and mixed liquid suspended solids of the reactor increased. Sludge volume index decreased continuously for a few days and then stabilized at 22 ml g-1. Selective pressure induced by settling velocity was proved to play a crucial role in activated sludge granulation. Based on the continuously measured data, the granulation process was divided into three phases, granules namely initiating, developing and maturating.

Download Full-text

Research on Aerobic Granular Sludge Cultivated under Selective Pressure

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1004-1005.908 ◽

2014 ◽

Vol 1004-1005 ◽

pp. 908-913

Author(s):

Qing Zhao ◽

Qi Xia Liu ◽

Xin Zou

Keyword(s):

Selective Pressure ◽

Batch Reactor ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Granular Sludge ◽

Aerobic Granular Sludge ◽

Uasb Reactor ◽

Municipal Sewage ◽

Carbon Substrate ◽

Aerobic Sludge

Inoculated with aerobic sludge from the UASB reactor of a pharmaceutical plant and excess sludge of a municipal sewage treatment plant, granulation of aerobic sludge was realized in a sequencing batch reactor fed with glucose as carbon substrate. Selective pressure created by means of increasing organic loading and decreasing sedimentation time enhances the formation of aerobic granular sludge. Granules started to appear after 35 days operation. The granules were composed of filamentous species with varying degrees of rod-and coccal-type bacteria. While COD and NH4+-N of influent retaining 1600mg/l and 160mg/l, COD and NH4+-N of effluent respectively were 40mg/l and 1mg/l. The removal rates were higher than 95% and 99%.

Download Full-text

Cultivation of aerobic granular sludge in continuous flow under various selective pressure

Bioresource Technology ◽

10.1016/j.biortech.2018.01.056 ◽

2018 ◽

Vol 253 ◽

pp. 281-287 ◽

Cited By ~ 9

Author(s):

Tanner R. Devlin ◽

Jan A. Oleszkiewicz

Keyword(s):

Continuous Flow ◽

Selective Pressure ◽

Granular Sludge ◽

Aerobic Granular Sludge

Download Full-text

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.1630 ◽

2011 ◽

Vol 356-360 ◽

pp. 1630-1636

Author(s):

Guo Jing Yang ◽

Xiao Ming Li ◽

Qi Yang ◽

Kun Luo

Keyword(s):

Nitrogen Removal ◽

Sequencing Batch Reactor ◽

Settling Velocity ◽

Selective Pressure ◽

Batch Reactor ◽

Treatment Plant ◽

Granular Sludge ◽

Aerobic Granular Sludge ◽

Conventional Activated Sludge ◽

Sedimentation Time

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.

Download Full-text