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Anaerobic Co‐Digestion of Aircraft Deicing Fluid and Municipal Wastewater Sludge
Author(s) -
Zitomer D.,
Ferguson N.,
McGrady K.,
Schilling J.
Publication year - 2001
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143001x143376
Subject(s) - alkalinity , chemical oxygen demand , methanogenesis , waste management , kjeldahl method , wastewater , environmental science , anaerobic digestion , biochemical oxygen demand , anaerobic exercise , methane , environmental engineering , chemistry , nitrogen , engineering , physiology , organic chemistry , biology
At many airports, aircraft deicing fluid and precipitation mix, becoming aircraft deicing runoff having a 5‐day biochemical oxygen demand (BOD 5 ) of 10 2 to 10 6 mg/L. Publicly owned treatment works can be used for aerobic biological treatment; however, it may be more economical to use anaerobic digesters to codigest a mixture of aircraft deicing fluid and sludge. The objectives of this investigation were to determine benefits and appropriate propylene glycol aircraft deicing fluid loadings to anaerobic codigesters. Results demonstrate aircraft deicing fluid can be successfully codigested to produce methane; supernatant BOD 5 and Kjeldahl nitrogen concentration were not higher in codigesters compared to a conventional digester. Aircraft deicing fluid loadings as high as 1.6 g chemical oxygen demand (COD)/L·d were sustainable in codigesters, whereas system fed only aircraft deicing fluid with nutrients and alkalinity achieved a loading of 0.65 g COD/L·d. The sludge used increased digester alkalinity and provided nitrogen, iron, nickel, cobalt, and biomass required for methanogenesis. The deicer provides organics for increased methane production.