Production and application of anaerobic granular sludgeproduced by landfill
WANG Jin , ZHANG Zhen-jia , ZHANG Zhi-feng , QAISAR Mahmood , ZHENG Ping
DOI:
Received February 14, 2007,Revised April 24, 2007, Accepted , Available online
Volume 19,2007,Pages 1454-1460
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Sludge granulation is considered to be the most critical parameter governing successful operation of an upflow anaerobic sludge
blanket and expanded granular sludge bed (EGSB) reactors. Pre-granulated seeding sludge could greatly reduce the required startup
time. Two lab-scale and a pilot-scale EGSB reactors were operated to treat Shaoxing Wastewater Treatment Plant (SWWTP)
containing wastewater from real engineering printing and dyeing with high pH and sulfate concentration. The microbiological structure
and the particle size distribution in aerobic excess sludge, sanitary landfill sludge digested for one year, and the granular sludge of
EGSB reactor after 400 d of operation were analyzed through scanning electron microscopy (SEM) and sieves. The lab-scale EGSB
reactor seeded with anaerobic sludge after digestion for one year in landfill showed obviously better total chemical oxygen demand
(TCOD) removal e ciency than one seeded with aerobic excess sludge after cation polyacrylamide flocculation-concentration and
dehydration. The TCOD removed was 470.8 mg/L in pilot scale EGSB reactor at short hydraulic retention time of 15 h. SEM of sludge
granules showed that the microbiological structure of the sludge from di erent sources showed some di erences. SEM demonstrated
that Methanobacterium sp. was present in the granules of pilot-scale EGSB and the granular sludge produced by landfill contained a
mixture of anaerobic/anoxic organisms in abundance. The particle size distribution in EGSB demonstrated that using anaerobic granular
sludge produced by sanitary landfill as the seeding granular sludge was feasible.
