8Th iwa symposium on waste management problems in agro-industries- agro'2011: H2O2/UV-C treatment of textile preparation wastewater: Kinetic investigation on alternative combinations of commercial textile preparation auxiliaries

Idil Arslan-Alaton*, Tugba Olmez-Hanci, Sarina Shayin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Four different textile preparation effluents were simulated to examine the applicability of the hydrogen peroxide/ultraviolet-C(H2O 2/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 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.

Original languageEnglish
Pages (from-to)1531-1537
Number of pages7
JournalEnvironmental Technology (United Kingdom)
Volume33
Issue number13
DOIs
Publication statusPublished - 2012

Funding

The authors acknowledge the financial support of the Scientific and Technological Research Council of Turkey (TUBITAK) under project number 108Y051.

FundersFunder number
TUBITAK108Y051
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

    Keywords

    • Hydroxyl radical scavengers
    • Nonyl phenol decaethoxylate (NP-10)
    • Phosphonic acidbased sequestering agents
    • Textile preparation effluent

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