title: Effects of high salinity and constituent organic compounds on treatment of photo-processing waste by a sulfur-oxidizing bacteria/granular activated carbon sludge system.
abstract: To achieve practical treatment of photo-processing waste (PW) using our previously proposed sulfur-oxidizing bacteria (SOB)/granular activated carbon (GAC) sludge system, this paper elucidates why 3- to 5-X dilution of PW was required. That is, a series of experiments were carried out to show the effects of high salinity and constituent organic compounds in PW, respectively. Both an inorganic salts system and calcination PW system showed that SOB completely oxidizes S2O(3)2- -S to SO(4)2- -S even at 12.3 or 13.6% salinity, respectively; hence the dilution requirement is not attributable to high salinity. In experiments employing SOB and SOB/GAC systems to investigate the effects of 23 constituent compounds in PW, compounds were classified into Groups I, II, IIIa, and IIIb. Even with 10 g/l GAC, the nine compounds in Group IIIb still exhibited a toxic effect on SOB activity at 1- and 3-X dilutions; thus it is these compounds that are responsible for requiring dilution of PW. Accordingly, a reduction in their use within the photodeveloping and fix-stabilizing industry, and/or use of > 10g/l GAC, are new considerations for establishing a more practical PW treatment process.
authors.affiliation: Research Center for Chemical Risk Management, National Institute of Advanced Industrial Science and Technology, Tsukuba City, Japan. binle-lin@aist.go.jp
authors.forename: Bin-Le
authors.initials: BL
authors.lastname: Lin
authors.forename: Masaaki
authors.initials: M
authors.lastname: Hosomi
authors.forename: Akihiko
authors.initials: A
authors.lastname: Murakami
mesh_terms: D001419:Bacteria; D019149:Bioreactors; D002606:Charcoal / Q000737:chemistry*; D007220:Industrial Waste; D009930:Organic Chemicals; D010781:Photography; D012965:Sodium Chloride / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D009930:Organic Chemicals; D002606:Charcoal; D012965:Sodium Chloride