Phosphorus recovery as struvite: Recent concerns for use of seed, alternative Mg source, nitrogen conservation and fertilizer potential

  • Qian L
  • Wang S
  • Xu D
 et al. 
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Abstract

Sludge reduction technologies are increasingly important in wastewater treatment, but have some defects. In order to remedy them, a novel, integrated process including sludge reduction, inorganic solids separation, phosphorus recovery, and enhanced nutrient removal was developed. The pilot-scale system was operated steadily at a treatment scale of 10m3/d for 90days. The results showed excellent nutrient removal, with average removal efficiencies for NH4+-N, TN, TP, and COD reaching 98.2??1.34%, 75.5??3.46%, 95.3??1.65%, and 92.7??2.49%, respectively. The ratio of mixed liquor volatile suspended solids (MLVSS) to mixed liquor suspended solids (MLSS) in the system gradually increased, from 0.33 to 0.52. The process effectively prevented the accumulation of inert or inorganic solids in activated sludge. Phosphorus was recovered as a crystalline product with aluminum ion from wastewater. The observed sludge yield Yobs of the system was 0.103gVSS/g COD, demonstrating that the system's sludge reduction potential is excellent. ?? 2013 Elsevier Ltd.

Author-supplied keywords

  • --crystallization
  • 7-aminocephalosporanic acid
  • Accumulation
  • Activated sludge process
  • Aeration
  • Aerobic Sludge Retention Time (SRT)
  • Alkali treatment
  • Alkaline treatment
  • Alkaline-treated sludge
  • Alkalinity
  • Ammonia recovery
  • Ammonia removal
  • Anaerobic digestion
  • Anaerobic effluent
  • Anaerobic/anoxic/aerobic process (A2/O)
  • Anaerobic/anoxic/oxic reactor
  • Biodegradability
  • Biogas production
  • Biological aerated filter (BAF)
  • Biological nutrient removal
  • Biosolids
  • Brackish/marine fish
  • Calcium
  • Carbon source recovery
  • Chemical
  • Chemical phosphorus recovery
  • Chemical precipitation
  • Chemical: analysis
  • Continuous reaction crystallization
  • Crystal
  • Crystalline product quality
  • Crystallisation
  • Crystallization
  • Denitrifying phosphorus accumulating organisms (DP
  • Denitrifying phosphorus removal
  • Diafiltration
  • Economics
  • Electrodialysis
  • Electron beam melting
  • Energy and resource recovery
  • Enhanced biological phosphorus removal
  • Enhanced nutrient removal
  • Evaporation
  • Excess sludge
  • Fluid
  • Fluid: methods
  • High salinity
  • Industrial wastewater
  • Inorganic solids separation
  • Internal carbon source
  • Kinetics
  • Lactobacillus buchneri
  • Lactobacillus plantarum
  • MAP
  • Magnesium ammonium phosphate
  • Marine aquaculture recirculation system
  • Mass balance
  • Mathematical modeling
  • Membrane bioreactor
  • Metal leaching
  • Metals
  • Microbial activity
  • Microfiltration
  • Microwave pretreatment
  • Models
  • Molecular weight distribution
  • Nitrogen and phosphorus removal
  • Nutrient leaching
  • Nutrient recovery
  • Ozonation
  • Phosphate
  • Phosphate industry
  • Phosphate recovery
  • Phosphorous recovery
  • Phosphorus
  • Phosphorus recovery
  • Phosphorus recycling
  • Phosphorus release
  • Phosphorus removal
  • Recirculating aquaculture system (RAS)
  • Recovery
  • Recyling
  • Removal mechanism
  • Renewable
  • Selective P removal
  • Sewage sludge
  • Side-stream system
  • Silicon
  • Sludge
  • Sludge reduction
  • Struvite
  • Struvite precipitation
  • Struvite reactor
  • Sustainability
  • Sustainable
  • Sustainable nutrient removal
  • Swine wastewater
  • Thermal treatment
  • Waste Disposal
  • Waste activated sludge
  • Wastewater
  • Water Pollutants
  • acid
  • ambient operating temperature
  • ammonia nitrogen
  • anaerobic treatment
  • are estimated to deplete
  • base
  • benefits
  • bioavailability of phosphorus
  • bioelectrochemical system
  • controlled precipitation
  • crystallisation
  • crystallization
  • drawbacks
  • enhanced biological phosphorus removal
  • fluidized bed reactor
  • fluidized-bed reactor
  • glycogen accumulating organisms
  • high-rate reactors
  • icle
  • importance of phosphorus recovery
  • in
  • integrated oco process
  • leaching
  • magnesium ammonia phosphate
  • map
  • microwave pretreatment
  • municipal wastewater sludge
  • nitrogen and phosphorus
  • nutrients removal and recovery
  • of the finite phosphorus
  • phosphorus recovery
  • phosphorus recycling
  • phosphorus removal
  • phosphorus uptake model
  • precipitation
  • resources and the
  • return liquor
  • review
  • sewage
  • sewage sludge
  • side-ditch separators
  • sidestream
  • sludge treatment
  • solubility
  • struvite
  • synthetic wastewater
  • the past decades have
  • the world phosphorus resources
  • tn removal
  • tp removal
  • wastewater
  • witnessed a rising awareness
  • ðstruvite

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Authors

  • Lili Qian

  • Shuzhong Wang

  • Donghai Xu

  • Yang Guo

  • Xingying Tang

  • Laisheng Lin Wang

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