Response of algal-bacterial granular system to low carbon wastewater: Focus on granular stability, nutrients removal and accumulation
Journal
Bioresource Technology
Journal Volume
268
Pages
221-229
Date Issued
2018
Author(s)
Abstract
The effect of influent chemical oxygen demand to nitrogen (COD/N) ratio on the granular stability, nutrients removal and accumulation of the algal-bacterial AGS was investigated. Two sequencing batch reactors were operated under different influent COD/N ratio, i.e., R1 (control, COD/N = 8) and R2: (COD/N = 8, 4, 2, and 1 through stepwise decrease of COD). Results showed that the integrity coefficient of the granules in R2 stabilized at 0.7–5.4% during the whole operation. Significantly enhanced dissolved inorganic carbon (DIC) uptake and the faster growth of algae indicated the great potential for reduction in greenhouse gases (GHGs) emission by using the algal-bacterial AGS system. The algal-bacterial AGS biomass contained high phosphorus (P) and N contents as well as extremely high P bioavailability (up to 98%) which could be easily used for resource recovery. Loosely bound extracellular polymeric substances (LB-EPS) might be the key factor to control the deterioration of granular stability in this system. © 2018 Elsevier Ltd
Subjects
Algal-bacterial aerobic granular sludge (AGS); Granular stability; Low carbon wastewater; Nutrients accumulation; Nutrients removal
Other Subjects
Batch reactors; Biochemistry; Carbon; Chemical oxygen demand; Chemical stability; Granular materials; Greenhouse gases; Nitrogen removal; Nutrients; Aerobic granular sludges; Dissolved inorganic carbon; Extra-cellular polymeric substances; Integrity coefficients; Low carbon; Nutrients accumulations; Nutrients removal; Sequencing batch reactors; System stability; ammonia; nitrogen; organophosphorus compound; phosphate; phosphorus; carbon; alga; bacterium; biomass; carbon; chemical oxygen demand; dissolved inorganic carbon; granular medium; greenhouse gas; nutrient; oxic conditions; wastewater; algal bacterial aerobic granular sludge; Article; bioavailability; carbon source; chemical oxygen demand; comparative study; controlled study; greenhouse gas; microbial activity; microbial biomass; oxygen consumption; priority journal; retention time; sludge stabilization; waste component removal; waste water management; aerobic metabolism; biochemical oxygen demand; bioreactor; chemistry; sewage; waste water; algae; Bacteria (microorganisms); Aerobiosis; Biological Oxygen Demand Analysis; Bioreactors; Carbon; Nitrogen; Sewage; Waste Disposal, Fluid; Waste Water
Type
journal article