Ozonation pre and post-treatment of denim textile mill effluents: Effect of cleaner production measures

Morali, E. Kaan
Yetiş, Ülkü
Denim production, which is one of the leading sub-sectors of textile industry that generates considerable amount of wastewater with high pollution load both from dyeing and finishing processes. This sub-sector is therefore to consider cleaner production opportunities for these processes to reduce its wastewater generation and pollution load. In a denim-producing plant, the wastewater treatability studies have revealed that the most technically applicable cleaner production alternatives are caustic recovery from alkaline finishing wastewaters, and reuse of indigo dyeing wastewaters via the application of membrane filtration. In the present study, impact of the changes in the final effluent quality due to the foreseen cleaner production measures were considered in reference to the evaluation of impact on ozonation treatment of the effluent from a denim-producing plant. Ozonation was applied as pretreatment to the effluent from the plant before the foreseen measures (chemical oxygen demand, COD = 2750 mg/L; color = 3950 Pt-Co), and to the simulated effluent after the foreseen measures (COD = 3100 mg/L; color = 4500 Pt-Co); and also as post-treatment to the biologically treated effluent (COD = 800 mg/L; color = 3700 Pt-Co) before the foreseen measures. When applied to the effluent before the foreseen measures as pretreatment, ozonation provided 86% color and 46% COD removal with 3240 mg/h ozone dose in 70 min. However, less satisfactory results were obtained with the wastewater after the measures; with 86% color and 31% COD removals at 3960 mg/h ozone dose in 80 min. In parallel to the decrease observed in COD removal, ozone consumption was also much higher than that for the wastewater before the cleaner production measures. The findings have indicated that the environmental benefits to be brought by cleaner production measures have to be balanced against the risks to be encountered in the treatment of the final effluent.


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Moralı, Eyüp Kaan; Yetiş, Ülkü; Department of Environmental Engineering (2010)
Denim production is one of the leading sub-sectors of textile industry which basically generates highly colored indigo dyeing effluents. In the present study, ozonation was applied to the indigo-dyeing effluent(COD=820 mg/L;color=5500 Pt-Co), and to the whole effluent from a denim-producing plant before(COD=2750 mg/L;color=3950 Pt-Co) and after(COD=800 mg/L,color=3700 Pt-Co) biological treatment for degradation/detoxification purposes. Ozonation was also tried in the wastewater of the plant(COD=3100 mg/L;co...
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This study aims at coupling of activated sludge treatment with nanofiltration to improve denim textile wastewater quality to reuse criteria. In the activated sludge reactor, the COD removal efficiency was quite high as it was 91 +/- 2% and 84 +/- 4% on the basis of total and soluble feed COD, respectively. The color removal efficiency was 75 +/- 10%, and around 50-70% of removed color was adsorbed on biomass or precipitated within the reactor. The high conductivity of the wastewater, as high as 8 mS/cm, did...
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To improve the sustainability of cement and concrete production, there is an increasing trend towards using industrial wastes throughout their production processes. The aim is to find new resources that can be used in any step of cement and concrete production and to find solutions to many problems related to the disposal of wastes. This article discusses the use of wastes generated from cement-bonded wood particle board (CB) manufacturing in cement production. CB waste, which basically contains wood chips ...
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The water consumption in textile industry, especially in dyeing and washing processes is too high. Therefore, large amount of wastewater is produced and discharged to the receiving environment during textile production process. Discharge of colored effluents without decoloration originated from textile industries may cause serious problems in the receiving environments. Besides water resources are limited. The textile industry should look for recycling and reusing this water. The objective of this chapter i...
Citation Formats
E. K. Morali, N. UZAL, and Ü. Yetiş, “Ozonation pre and post-treatment of denim textile mill effluents: Effect of cleaner production measures,” JOURNAL OF CLEANER PRODUCTION, pp. 1–9, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48005.