Influence of ferrous iron dosing strategy on aerobic granulation of activated sludge and bioavailability of phosphorus accumulated in granules
Journal
Bioresource Technology Reports
Journal Volume
2
Pages
7-14
Date Issued
2018
Author(s)
Abstract
Two different Fe2+ dosing strategies (with the same daily Fe2+ dosage of 19.5 mg/d), i.e. constant (R1 with fixed 5 mg Fe/L in influent) and pulse dosing (R2 with 30 mg Fe/L in influent only during the first cycle every day) were tested in two identical reactors and their comparison was conducted on granule formation, stability and performance on pollutants removal and P accumulation. Results showed that granules appeared earlier and relatively smaller in R2 (day 9), while biomass increased faster in R1. Relatively high and stable P removal could be achieved, averagely 92% in R1 and 81% in R2. The granules in R1 accumulated more P (45.6 mg/g-SS) with higher bioavailability (95%) after 48 days’ operation, especially with high non-apatite inorganic P content (36.2 mg/g-SS). This work also suggests that Fe2+ dosing strategy can be applied in conventional activated sludge processes when high bioavailable P recovery is targeted. ? 2018 Elsevier Ltd
Subjects
Activated sludge process; Biochemistry; Granular materials; Iron; Phosphate minerals; Phosphorus; Aerobic granular sludges; Aerobic granulation; Constant dosing; Conventional activated sludges; Ferrous iron; Granule formations; Pollutants removal; Pulse dosing; Granulation; ferrous ion; phosphorus; activated sludge; Article; bioaccumulation; bioavailability; biomass; concentration (parameters); molecular stability; physical chemistry; physical parameters; priority journal; retention time; waste water
SDGs
Type
journal article