Reusability of pre-treatment water obtained via textile wastewater by coagulation and filtration methods in reactive and disperse dyeing

Abstract

Besides high-water consumption in the textile industry, color, quantity, and variety of chemicals in discharged wastewater draws attention both in terms of environmental and economic aspects. Therefore, efficient, and reliable treatment techniques are needed. In this context, coagulation is a very important step in the treatment of wastewater. In this study, water recovery from textile wastewater taken from different discharge points was investigated by using coagulation and filtration methods. Iron (III) chloride hexahydrate (FeCl3.6H2O) was used as a coagulant. The optimum conditions were determined by studying the effect of different coagulant dosages and pH values. The filtration process was performed using 12-25 µm and <2 µm porous filters. Laboratory-scale reactive and disperse dyeing processes have been carried out to demonstrate the reusability of wastewater. At the end of the study, pollution removal efficiencies were determined as 91.1% for suspended solids, 64.7% for color and 72.1% for chemical oxygen demand. The findings of this study showed that coagulation and filtration will be useful processes for the enterprise in the pre-treatment of textile wastewater. It has been determined that the obtained pre-treatment waters can be used in disperse and reactive dyeing. Despite the pollution load in the pre-treatment water, it has been determined that dyeing errors do not occur, especially in reactive dyeing. This study revealed the effect of the pollution load in the pre-treatment water obtained by recovery methods from the wastewater discharged from textile dyehouse processes on the dyeing processes. In this study, it was aimed to emphasize that in order to reduce the water footprint, wastewater discharged from chemical processes can be classified and recycled and that pre-treatment water can be reused despite the pollution it contains.

Keywords

• Textile Wastewater
• Coagulation
• Filtration
• Disperse Dyeing
• Reactive Dyeing

Tekstil atık suyundan koagülasyon ve filtrasyon yöntemleriyle elde edilen ön arıtma suyunun reaktif ve dispers boyamalarda yeniden kullanılabilirliği

Abstract

Tekstil sektöründe yüksek su tüketiminin yanı sıra deşarj edilen atık sudaki kimyasalların rengi, miktarı ve çeşitliliği hem çevresel hem de ekonomik açıdan dikkat çekmektedir. Bu nedenle etkin ve güvenilir tedavi tekniklerine ihtiyaç vardır. Bu bağlamda atık suyun arıtımında pıhtılaşma çok önemli bir adımdır. Bu çalışmada farklı deşarj noktalarından alınan tekstil atık sularından koagülasyon ve filtrasyon yöntemleri kullanılarak su geri kazanımı araştırılmıştır. Pıhtılaştırıcı olarak demir (III) klorür heksahidrat (FeCl3.6H2O) kullanıldı. Optimum koşullar, farklı pıhtılaştırıcı dozajlarının ve pH değerlerinin etkisi incelenerek belirlendi. Filtrasyon işlemi 12-25 µm ve <2 µm gözenekli filtreler kullanılarak gerçekleştirildi. Atık suyun yeniden kullanılabilirliğini göstermek amacıyla laboratuvar ölçeğinde reaktif ve dispers boyama işlemleri gerçekleştirilmiştir. Çalışma sonucunda kirlilik giderim verimleri askıda katı madde için %91,06, renk için %64,68, kimyasal oksijen ihtiyacı için %72,12 olarak belirlendi. Bu çalışmanın bulguları, tekstil atıksularının ön arıtımında koagülasyon ve filtrasyonun işletme açısından faydalı prosesler olacağını göstermiştir. Elde edilen ön arıtma sularının dispers ve reaktif boyamalarda kullanılabileceği belirlenmiştir.

Keywords

• Tekstil atık suyu
• Koagülasyon
• Filtrasyon
• Dispers boyama
• Reaktif boyama

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