Ionic response of algal-bacterial granular sludge system during biological phosphorus removal from wastewater
Journal
Chemosphere
Journal Volume
264
Date Issued
2021
Author(s)
Abstract
Biological phosphorus removal (BPR) from wastewater can be generally realized through alternative non-aeration and aeration operation to create anaerobic and aerobic conditions respectively for P release and uptake/accumulation by polyphosphate accumulating organisms (PAOs), with P removal finally achieved by controlled discharge of P-rich sludge. In this study, the response of algal-bacterial aerobic granular sludge (AB-AGS) during BPR to main ions including Ac− (acetate), Cl−, SO42−, NH4+, K+, Mg2+, Ca2+ and Na+ in wastewater was investigated with conventional bacterial AGS (B-AGS) as control and acetate as the sole carbon source. Results show that BPR process mainly involved the changes of Ac−, K+, Mg2+, and Ca2+ rather than Cl−, SO42−, NH4+ and Na+. The mole ratio of ΔP/ΔAc kept almost unchanged during the non-aeration (P release) phase in both B-AGS and AB-AGS systems (ΔPB-AGS/ΔAcB-AGS > ΔPAB-AGS/ΔAcAB-AGS), and it was negatively influenced by the light in AB-AGS systems, in which 62% of acetate was not utilized for P release at the high illuminance of 81 k lux. During the entire non-aeration/aeration period, both ΔK/ΔP and ΔMg/ΔP remained constant, while ΔKAB-AGS/ΔPAB-AGS > ΔKB-AGS/ΔPB-AGS and ΔMgAB-AGS/ΔPAB-AGS ≈ ΔMgB-AGS/ΔPB-AGS. The presence of algae seemed not beneficial for PAOs to remove P, while more K+ and P uptake by algae in AB-AGS suggest its great potential for manufacturing biofertilizer. © 2020 Elsevier Ltd
Subjects
Acetate; Algal-bacterial aerobic granular sludge; Anion; Cation; Phosphorus release
Other Subjects
Algae; Bacteria; Biological water treatment; Granular materials; Phosphorus; Aerobic condition; Aerobic granular sludges; Bio fertilizers; Biological phosphorus removal; Granular sludge systems; Main ions; Polyphosphate-accumulating organisms; Sole carbon source; Chemicals removal (water treatment); acetic acid; ammonia; calcium; chlorine; magnesium; phosphorus; potassium; sodium; biological product; nitrogen; phosphorus; activated sludge; alga; bacterium; biological method; ionic composition; oxic conditions; phosphorus; pollutant removal; wastewater treatment; aeration; aerobic granular sludge; algal bacterial aerobic granular sludge; analytic method; Article; carbon source; enhanced biological phosphorus removal; polyphosphate accumulating organism; waste water management; bioreactor; sewage; waste water; algae; Bacteria (microorganisms); Biological Products; Bioreactors; Nitrogen; Phosphorus; Sewage; Waste Disposal, Fluid; Waste Water
Type
journal article