Anaerobic treatment of sludge from a nitrification-denitrification landfill leachate plant.
The viability of anaerobic digestion of sludge from a MSW landfill leachate treatment plant, with COD values ranging between 15,000 and 19,400mg O(2)dm(-3), in an upflow anaerobic sludge blanket reactor was studied. The reactor employed had a useful capacity of 9l, operating at mesophilic temperature. Start-up of the reactor was carried out in different steps, beginning with diluted sludge and progressively increasing the amount of sludge fed into the reactor. The study was carried out over a period of 7 months. Different amounts of methanol were added to the feed, ranging between 6.75 and 1cm(3)dm(-3) of feed in order to favour the growth of methanogenic flora. The achieved biodegradation of the sludge using an upflow anaerobic sludge blanket Reactor was very high for an HRT of 9 days, obtaining decreases in COD of 84-87% by the end of the process. Purging of the digested sludge represented approximately 16% of the volume of the treated sludge.
Marañón
E
E
Chemical and Environmental Engineering Department, Higher Polytechnic School of Engineering, University of Oviedo, Campus of Viesques, 33204 Gijón, Spain. emara@uniovi.es
Castrillón
L
L
Fernández
Y
Y
Fernández
E
E
D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D019216:Metals, Heavy / Q000032:analysis; D008697:Methane / Q000378:metabolism; D009566:Nitrates / Q000032:analysis / Q000378:metabolism; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000032:analysis / Q000378:metabolism; D012722:Sewage / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism
D019216:Metals, Heavy; D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D012722:Sewage; D014874:Water Pollutants, Chemical; D009584:Nitrogen; D008697:Methane