Magnesium carbonate precipitate strengthened aerobic granules.
Aerobic granules were precipitated internally with magnesium carbonate to enhance their structural stability under shear. The strengthened granules were tested in continuous-flow reactors for 220 days at organic loadings of 6-39 kg/m(3)/day, hydraulic retention times of 0.44-19 h, and temperatures of 10 or 28°C. The carbonate salt had markedly improved the granule strength without significant changes in granule morphology or microbial communities (with persistent strains Streptomyces sp., Rhizobium sp., Brevundimonas sp., and Nitratireductor sp.), or sacrifice in biological activity for organic degradation. MgCO3 precipitated granules could be used in continuous-flow reactor for wastewater treatment at low cost and with easy processing efforts.
Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan. Electronic address: djlee@ntu.edu.tw.
Duu-Jong
DJ
Lee
Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.
Yu-You
YY
Chen
D000332:Aerobiosis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D011232:Chemical Precipitation; D004275:DNA, Ribosomal / Q000235:genetics; D058645:Denaturing Gradient Gel Electrophoresis; D008274:Magnesium / Q000737:chemistry*; D010316:Particle Size; D012722:Sewage / Q000737:chemistry*; D014465:Ultrasonics; D014865:Waste Disposal, Fluid
D004275:DNA, Ribosomal; D012722:Sewage; C005479:magnesium carbonate; D008274:Magnesium
COD removal; Continuous-flow reactor; Stability; Strength