title: Strengthening aerobic granule by salt precipitation.
abstract: Structural stability of aerobic granules is generally poor during long-term operation. This study precipitated seven salts inside aerobic granules using supersaturated solutions of (NH4)3PO4, CaCO3, CaSO4, MgCO3, Mg3(PO4)2, Ca3(PO4)2 or SiO2 to enhance their structural stability. All precipitated granules have higher interior strength at ultrasonic field and reveal minimal loss in organic matter degradation capability at 160-d sequential batch reactor tests. The strength enhancement followed: Mg3(PO4)2=CaSO4>SiO2>(NH4)3PO4>MgCO3>CaCO3=Ca3(PO4)2>original. Also, the intra-granular solution environment can be buffered by the precipitate MgCO3 to make the aerobic granules capable of degradation of organic matters at pH 3. Salt precipitation is confirmed a simple and cost-effective modification method to extend the applicability of aerobic granules for wastewater treatments.
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Yu-You
authors.initials: YY
authors.lastname: Chen
authors.affiliation: College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
authors.forename: Xiangliang
authors.initials: X
authors.lastname: Pan
authors.affiliation: College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan; College of Environment, Zhejiang University of Technology, Hangzhou 310014, China. Electronic address: djlee@ntu.edu.tw.
authors.forename: Duu-Jong
authors.initials: DJ
authors.lastname: Lee
mesh_terms: D019149:Bioreactors; D012722:Sewage / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*
chemical_list: D012722:Sewage; D012965:Sodium Chloride; D062065:Wastewater
keywords: Salt; Sequential batch reactor; Stability; Strength