title: Characterization of organic particulates present in milk factory process waters used for reuse along with aerobically digested effluent wastewater.
abstract: Wastewater from a dairy processor is being reused and recycled both within the plant and for irrigation. Flash pyrolysis GC-MS was used to examine nitrogen and phenol containing compounds (M.W.=35 to 450 g/mol) in the particulate fraction of the milk condensate, combined clean wastewater and aerobic bioreactor effluent. For comparison, the particulates were also prepared for standard GC-MS analyses using conventional solvent extraction methods. Compounds detected by pyrolysis GC-MS were found mostly in the bioreactor with the amino acid arginine (220 mg/kg) and the amino acid derivative 1-methyl-5-oxo-L-proline methyl ester (130 mg/kg) found at the highest concentrations. In comparison, sterols detected in the effluent were found at higher concentrations when using solvent extraction indicating some degradation with pyrolysis GC-MS. However, with few exceptions, particulates were generally found not to act as passive collectors capable of concentrating less water soluble chemicals.
authors.affiliation: School of Applied Science and Engineering, Bldg. 2W, Gippsland Campus, Monash University, Churchill, Victoria 3842, Australia.
authors.forename: Vincent
authors.initials: V
authors.lastname: Verheyen
authors.forename: Alicia
authors.initials: A
authors.lastname: Cruickshank
authors.forename: Karl
authors.initials: K
authors.lastname: Wild
authors.forename: Michael W
authors.initials: MW
authors.lastname: Heaven
authors.forename: Rachel
authors.initials: R
authors.lastname: McGee
authors.forename: Mark
authors.initials: M
authors.lastname: Watkins
authors.forename: David
authors.initials: D
authors.lastname: Nash
mesh_terms: D000332:Aerobiosis; D000818:Animals; D001419:Bacteria / Q000378:metabolism*; D055598:Chemical Phenomena; D003612:Dairying; D008401:Gas Chromatography-Mass Spectrometry; D008892:Milk; D052638:Particulate Matter / Q000737:chemistry*; D059027:Recycling / Q000379:methods*; D045483:Rivers / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
chemical_list: D052638:Particulate Matter; D012997:Solvents