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Title: Chloride or sulfate? Consequences for ozonation of textile wastewater
Authors: Öktem, Yalçın Aşkın
Yüzer, Burak
Aydın, Muhammed Iberia
Ökten, Hatice Eser
Meriç, Süreyya
Selçuk, Hüseyin
Keywords: Adsorbable organic halogens
Reactive dye
Textile wastewater
Issue Date: Oct-2019
Publisher: Academic Press Inc.
Source: :Öktem, Y. A., Yüzer, B., Aydın, M.I., Ökten, H. E., Meriç, S.and Selçuk, H. (2019). Chloride or sulfate? Consequences for ozonation of textile wastewater. Journal of Environmental Management, 247, 749-755. doi:10.1016/j.jenvman.2019.06.114
Abstract: Ozonation of chloride-rich textile wastewater is a common pretreatment practice in order to increase biodegradability and therefore meet the discharge limits. This study is the first to investigate ozone-chloride/bromide interactions and formation of hazardous adsorbable organic halogens (AOX) in real textile wastewater. Initially effect of ozonation on chloride-rich real textile wastewater samples were investigated for adsorbable organic halogens (AOX) formation, biodegradability and toxicity. After 15 min of ozonation, maximum levels of chlorine/bromine generation (0.3 mg/l) and AOX formation (399 mg/l) were reached. OUR and SOUR levels both increased by approximately 58%. Daphnia magna toxicity peaked at 100% for 10 min ozonated sample. Considering adverse effects of ozonation on chloride-rich textile industry effluents, we proposed replacement of NaCl with Na2SO4. Comparative ozonation experiments were carried out for both chloride and sulfate containing synthetic dyeing wastewater samples. Results showed that use of sulfate in reactive dyeing increased biodegradability and decreased acute toxicity. Although sulfate is preferred over chloride for more effective dyeing performance, the switch has been hampered due to sodium sulfate's higher unit cost. However, consideration of indirect costs such as contributions to biodegradability, toxicity, water and salt recovery shall facilitate textile industry's switch from chloride to sulfate.
ISSN: 0301-4797
Appears in Collections:Environmental Engineering / Çevre Mühendisliği
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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