Insight into aerobic phosphorus removal from wastewater in algal-bacterial aerobic granular sludge system
Journal
Bioresource Technology
Journal Volume
352
Date Issued
2022
Author(s)
Abstract
This study aimed to figure out the main contributors to aerobic phosphorus (P) removal in the algal-bacterial aerobic granular sludge (AGS)-based wastewater treatment system. Kinetics study showed that aerobic P removal was controlled by macropore (contributing to 64–75% P removal) and micropore diffusion, and the different light intensity (0, 4.0, 12.3, and 24.4 klux) didn't exert significant (p > 0.05) influence on P removal. On the other hand, the increasing light intensity did promote microalgae metabolism, leading to the elevated wastewater pH (8.0–9.8). The resultant pH increase had a strongly negative relationship (R2 = 0.9723) with P uptake by polyphosphate-accumulating organisms, while promoted chemical Ca-P precipitation at a molar Ca/P ratio of 1.05. Results from this work could provide an in-depth understanding of microalgae-bacteria symbiotic interaction, which is helpful to better design and operate the algal-bacterial AGS systems. © 2022 Elsevier Ltd
Subjects
Algal-bacterial aerobic granular sludge; Biological phosphorus removal; Calcium phosphate precipitation; Polyphosphate-accumulating organisms; Rate-controlling process
Other Subjects
Algae; Biological water treatment; Calcium phosphate; Granular materials; Molar ratio; Precipitation (chemical); Wastewater treatment; Aerobic granular sludges; Algal-bacterial aerobic granular sludge; Biological phosphorus removal]; Calcium phosphate precipitation; Granular sludge systems; Light intensity; P removal; Phosphorus removal; Polyphosphate-accumulating organisms; Rate-controlling process; Bacteria; cakcium; phosphorus; unclassified drug; nitrogen; phosphorus; concentration (composition); light intensity; macropore; pollutant removal; precipitation (chemistry); wastewater; wastewater treatment; wastewater treatment plant; aerobic granular sludge; algal bacterial aerobic granular sludge; algal growth; Article; diffusion; heavy metal removal; light intensity; microalga; pH; polyphosphate accumulating organism; precipitation; waste water management; aerobic metabolism; bacterium; bioreactor; metabolism; microalga; microbiology; sewage; wastewater; Aerobiosis; Bacteria; Bioreactors; Microalgae; Nitrogen; Phosphorus; Sewage; Waste Disposal, Fluid; Waste Water
Type
journal article