title: Organotins' fate in lagoon sewage system: dealkylation and sludge sorption/desorption.
abstract: Organotin compounds (OTs) have been widely used for their biocidal properties and as stabilizers in various industrial applications. Due to their high toxicity, organotins are subject to many studies regarding their behavior in wastewater treatment plant and aquatic environment. However, few studies are available regarding their behavior in lagoon sewage system, although such treatment is commonly used for sewage treatment in low-population areas. The present study aimed at studying the fate of organotins (monobutyltin (MBT), dibutyltin (DBT), and tributyltin (TBT)) in lagoon sewage system. Short-term experiments, carried out at lab scale, consisted in sampling sludge from aerobic stabilization ponds, and then quantifying sorption and desorption of the different organotin species, as well as their respective transformation, under defined operating conditions (e.g., tributyltin spike and dilution) simulating possible change in the surrounding environment of sludge in the lagoon. Results established that a very important percentage of the OTs was localized in the solid phase of the sludge (more than 98 %), whatever the operating conditions may be; however, transformation and locations of the three OT species differed according to the different conditions of sludge dilution, TBT spiking, and test duration. After dilution of lagoon sludge, TBT desorption from sludge was observed; it was supposed that dealkylation of TBT after desorption occurred rapidly and increased dissolved MBT and DBT in liquid phase; MBT sorbed subsequently on solid phase. The nature of the diluent (i.e., tap water or saline solution) appeared to slightly influence the sludge behavior. After TBT spiking, TBT was supposed to be rapidly sorbed but also transformed in DBT and MBT that would as well sorbed on the sludge, which explained the decrease of these species in the liquid phase. Tests aimed at studying long-term effect of TBT spiking demonstrated that the sorbed species could be remobilized and transformed after a dilution.
authors: Innovation and Management College, Songkhla Rajabhat University, Muang, Songkhla, 90000, Thailand.
authors: Thiwari
authors: T
authors: Ophithakorn
authors: UMR HydroSciences Montpellier, Université de Montpellier, Montpellier Cedex 5, France.|Faculté des Sciences et Techniques de Fès, Université Sidi Mohamed Ben Abdellah, Route d'Imouzzer, BP 2202, 30000, Fès, Morocco.
authors: Aboubakr
authors: A
authors: Sabah
authors: UMR Qualisud, UFR des Sciences Pharmaceutiques et Biologiques, Université de Montpellier, Montpellier Cedex 5, France.
authors: Michele
authors: M
authors: Delalonde
authors: UMR HydroSciences Montpellier, Université de Montpellier, Montpellier Cedex 5, France.
authors: Chrystelle
authors: C
authors: Bancon-Montigny
authors: ASEAN Institute for Health Development, Mahidol University, Phutthamonthon, Nakhonpathom, 73170, Thailand.
authors: Thunwadee Tachapattaworakul
authors: TT
authors: Suksaroj
authors: UMR Qualisud, UFR des Sciences Pharmaceutiques et Biologiques, Université de Montpellier, Montpellier Cedex 5, France. christelle.wisniewski@univ-montp1.fr.
authors: Christelle
authors: C
authors: Wisniewski
mesh_terms: D000327:Adsorption; D003640:Dealkylation; D004784:Environmental Monitoring / Q000379:methods*; D005602:France; D009947:Organotin Compounds / Q000032:analysis* / Q000737:chemistry; D061005:Ponds / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D014220:Trialkyltin Compounds / Q000032:analysis / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D009947:Organotin Compounds; D012722:Sewage; D014220:Trialkyltin Compounds; D062065:Wastewater; D014874:Water Pollutants, Chemical; C516409:mono-n-butyltin; C056189:di-n-butyltin; C011559:tributyltin
keywords: Dealkylation; Desorption; Dibutyltin; Lagoon sludge; Monobutyltin; Organotin; Sorption; Tributyltin