The effects of Fenton's reagent pretreatment on the biodegradability of nonionic surfactants
WATER RESEARCH, cilt.33, sa.11, ss.2561-2568, 1999 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 33 Sayı: 11
- Basım Tarihi: 1999
- Doi Numarası: 10.1016/s0043-1354(98)00476-x
- Dergi Adı: WATER RESEARCH
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.2561-2568
- Anahtar Kelimeler: Fenton's reagent, nonionic surfactant, alkylphenol ethoxylates, ethylene oxide, propylene oxide, advanced oxidation process, biodegradation, ALKYLPHENOL POLYETHOXYLATE SURFACTANTS, AQUATIC ENVIRONMENT, HYDROGEN-PEROXIDE, WASTE-WATER, TRANSFORMATION, BEHAVIOR
- Süleyman Demirel Üniversitesi Adresli: Evet
Özet
The effectiveness of Fenton's reagent pretreatment on the biodegradability of selected nonylphenol ethoxylates (NPEs) ethylene oxide/propylene oxide (EO/PO) block copolymers and a nonsurfactant compound polypropylene glycol (PPG) was examined. Chemical oxidation kinetic studies were conducted that showed that the Fenton reaction was rapid at the base conditions used (approx. 1000 mg/L COD 1000 mg/L H2O2, H2O2,/Fe-II molar ratio of unity) based on dissolved organic carbon, chemical oxygen demand, H2O2 and Fe-II removals. Batch aerobic bioassays were conducted to assess both the rate and the extent of biodegradability of the chemically preoxidized and unoxidized samples. A 12-L sequencing batch reactor (SBR) was operated aerobically to provide acclimated biomass for use in the bioassays. EO/PO block copolymers, PPGs and (to a lesser degree) NPEs were found to be biorecalcitrant, that is, resistant to biomineralization. Advanced oxidation pretreatment using Fenton's reagent was highly effective at enhancing the biodegradability of EO/PO block copolymers and PPG. The biodegradability of NPEs, however; decreased with low oxidant dosages and increased with higher oxidant dosages. Economic estimates showed that chemical costs would comprise more than 90% of the overall treatment costs for an integrated Fenton/activated sludge treatment system. (C) 1999 Elsevier Science Ltd. All rights reserved.