Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (7): 37-41,46.

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Cultivation of Aerobic Granular Sludge in Microaerobic Condition

Lan Hui-xia  Chen Zhong-hao  Chen Yuan-cai  Chen Rong   

  1. State Key Laboratory of Pulp and Paper Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2004-03-12 Online:2005-07-25 Published:2005-07-25
  • Contact: Lan Hui—xia(born in 1974)，female，Ph．D．candidate． mainly researches on po llution control of wastewater E-mail:lanhuixia@ tom.com
  • About author:Lan Hui—xia(born in 1974)，female，Ph．D．candidate． mainly researches on po llution control of wastewater
  • Supported by:

    Suppo rted by the Guangdong Provincial Natural Science Foundation(031430)and the Foundation of State Key Laboratory of Pulp and Paper Engineering,So uth China University of Technology(200335)

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Abstract:

Aerobic granular sludge was cultured in microaernbic condition,that is,with a dissolved oxygen (DO)content in the aeration vessel of 0.2 to 0.7 me/L.Anaerobic granules were chosen as the seed sludge.The variations in the appearance an d size of the anaerobic sludge during the cultivation were observed,an d the varia-tions in the MLSS(Mixed-Liquor Suspended Solid),SV(Sludge Volume),SVI(Sludge Volumetric Index)and VSS(Volatile Suspended Solids)of the flocculent sludge as well as in the volume of the granular sludge were also measured.It is f0und that the an aerobic gran ules are completely disaggregated after a 5-day cultivation.that new granules are formed after a 10-day cultivation,and that the sludge in the reactor is completely gran ulated after40 days.It is also shown that the mature gran ules ale san dy beige,witIl a diameter of 500 to 3000 m,a SVI value of 18.147mL/g,a specific gravity of 1.020g/cm3 ,a mass fraction of the moisture of 95.7% and a mass fraction of the organ ic components of 74.1% .thus resulting in a settling rate of 52 m/h.All these items overmatch those of the conventional activated sludge an d the aerobic granular sludge cultivated in conventional aeration.

Key words: microaerobic condition, aerobic granular sludge, cultivation, granulation