H2O2/UV-C treatment of textile preparation wastewater: kinetic investigation on alternative combinations of commercial textile preparation auxiliaries


Arslan-Alaton I. , OLMEZ-HANCI T., SHAYIN S.

ENVIRONMENTAL TECHNOLOGY, cilt.33, sa.13, ss.1531-1537, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 33 Konu: 13
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1080/09593330.2012.665489
  • Dergi Adı: ENVIRONMENTAL TECHNOLOGY
  • Sayfa Sayıları: ss.1531-1537

Özet

Four different textile preparation effluents were simulated to examine the applicability of the hydrogen peroxide/ultraviolet-C (H2O2/UV-C) advanced oxidation process for the treatment of real textile preparation (desizing, scouring and bleaching) wastewater bearing the non-ionic surfactant nonyl phenol decaethoxylate (NP-10). In the absence of any textile preparation chemical, NP-10 degradation was complete in 15 min (rate coefficient: 0.22 min(-1)) accompanied by 78% chemical oxygen demand (COD) (rate coefficient: 0.026 min(-1)) and 57% total organic carbon (TOC) (rate coefficient: 0.014 min(-1)) removals achieved after 60 min photochemical treatment. H2O2 consumption rates were not significantly affected by the introduction of carbonate and chloride ions (average rate coefficient: 0.032 min(-1)) at pH values <11.5, above which H2O2 dissociation to its conjugate base HO2- became pronounced. The organic, phosphonate-based sequestering agents competed with NP-10 for UV-C light absorption and HO center dot radicals. H2O2/UV-C oxidation of the simulated textile preparation effluent containing 3.0 g L-1 Cl-, 1.5 g L-1 NaOH and 1.0 g L-1 diethylenetriamine pentamethylene phosphonic acid (DTPMP) resulted in the worst treatment performance due to its high pH and organic carbon content. For this textile preparation effluent, NP-10 abatement was complete in 100 min (rate coefficient: 0.018 min(-1)), while COD and TOC removals dropped down to only 16% and 8%, respectively, achieved after 60 min treatment. The highest H2O2/UV-C oxidation efficiency resulting in 34% COD and 28% TOC removals was obtained for the simulated textile preparation effluent comprising of 3.0 g L-1 Cl-, 1.5 g L-1 NaOH and 1.0 g L-1 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP). For this textile preparation effluent, NP-10 degradation was complete after 50 min (rate coefficient: 0.061 min(-1)) exposure to H2O2/UV-C treatment.