title: Phosphate recovery as concentrated solution from treated wastewater by a PAO-enriched biofilm reactor.
abstract: Phosphorus recovery from wastewaters and its recycling are of importance for sustaining agricultural production. During the conventional enhanced biological phosphorus removal process, phosphorus is removed by withdrawing excess sludge from wastewater. However, excess sludge disposal is costly and energy intensive. A proposed novel process for phosphorus recovery from sewage treatment will result in no excess sludge if a polyphosphate accumulating organisms (PAOs) enrichment biofilm can be applied to effluents containing phosphate. This process allows the recovery of phosphate as phosphate-concentrated solutions by controlling PAOs to absorb and release phosphate. A reactor consisting of a modified trickling filter with a synthetic substrate (5 mg P L⁻¹) was operated to form a PAO-enriched biofilm. As a result of the enrichment, the concentration of phosphate of >100 mg P L⁻¹ was successfully achieved. During this experiment, no sludge withdrawal was carried out over the duration of the operation of 255 days. To highlight the new process, the principle of enriching PAOs on biofilm and concentrating phosphate from treated sewage is explained, and a discussion on phosphate recovery performance is given.
authors: Development of Civil and Environmental Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8527, Japan.
authors: Hiroya
authors: H
authors: Kodera
authors: Masashi
authors: M
authors: Hatamoto
authors: Kenichi
authors: K
authors: Abe
authors: Tomonori
authors: T
authors: Kindaichi
authors: Noriatsu
authors: N
authors: Ozaki
authors: Akiyoshi
authors: A
authors: Ohashi
mesh_terms: D018441:Biofilms; D001692:Biological Transport; D019149:Bioreactors / Q000382:microbiology*; D003247:Conservation of Natural Resources / Q000379:methods*; D005374:Filtration / Q000295:instrumentation; D006090:Gram-Negative Bacteria / Q000254:growth & development / Q000502:physiology*; D006094:Gram-Positive Bacteria / Q000254:growth & development / Q000502:physiology*; D007564:Japan; D009994:Osmolar Concentration; D010710:Phosphates / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D011122:Polyphosphates / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D012995:Solubility; D062065:Wastewater / Q000737:chemistry* / Q000382:microbiology; D018508:Water Purification / Q000295:instrumentation
chemical_list: D010710:Phosphates; D010758:Phosphorus; D011122:Polyphosphates; D012722:Sewage; D062065:Wastewater