Biological phosphorus removal with granular sludge in SBR

摘要

The formation and performance of granular sludge seeded with flocculating sludge was studied in a 4L sequencing batch reactor (SBR) treating a synthetic wastewater with sodium acetate as carbon source. By gradually reducing the settle time from 30 to 10 min, granule sludge was formed on day 20.The granules had a specific gravity of 1.0439, diameters of 0.5-2mm, and sludge volume index (SVI) of less than 50mL/g. Phosphorus removal granular sludge had good phosphorus removal characteristics. The efficiency of phosphorus removal was over 90%. The max. specific phosphorus release rate (SRPR) and the max. specific phosphorus uptake rate (SUPR) was 62.65 mg/(gVSS·h) and 51.76 mg/(gVSS·h), respectively. And the sludge phosphorus content (TP/SS) was 6.5%.