Formation of granular sludge with filamentous microorganisms in anaerobic sequencing batch reactor (ASBR)
厌氧序批式反应器中丝状颗粒污泥的形成

The formation of granular sludge in a bench-scale anaerobic sequencing batch reactor (ASBR) fed with glucose as substrate was investigated. The granulation of sludge was completed in about 120 days, which was much shorter than that reported before. The granular sludge had good settling ability (25 m/h) and specific methanogenic activity. The maximum of metabolic activity for formic acid, acetate, propionate and butyrate were 0.22, 0.83, 0.24 and 0.70 g COD/(g VSS·d), respectively. Scanning electron microscope images showed that the compact granules composed predominantly of the filamentous bacteria like Methanosaeta even under the condition of high acetate concentration