Investigation of Dyestuff Recycled from Wastewater Containing Indigo/Sulfur Dyes

Öz

Turkey is one of the important centers of denim fabric production in the world. Warp yarn is usually dyed using indigo and/or sulfur dyes according to the impregnation method. The common feature of these two dyes is that they are insoluble in water and dye temporarily with a reduction reaction. The recovery of dyes in wastewater is targeted. Wastewater containing indigo and sulfur dyes taken from İskur Denim was sedimented using the chemical flocculation technique and solid material was obtained after drying. The sedimentation process was affected by the pH of the environment, the mixing speed and the concentration of sedimentation chemicals. The best sedimentation was achieved by adding flocculators supplied by AKKİM to the wastewater sample in the pH range of 8-8.5. The obtained sludge was subjected to condensation reaction with the developed binding agent. The energy levels of the highest occupied molecular orbital and the lowest unoccupied molecular orbital of the dyes obtained from indigo and sulfur wastewater were determined as -4.78 eV and -4.04 eV, respectively, by cyclic voltammetry. These values are very close to the original dyes and give hope for dyeing performance.

Anahtar Kelimeler

• Indigo dyestuff
• Sulfur dyestuff
• Wastewater
• Carbon footprint
• Denim

İndigo/Kükürt Boyaları İçeren Atık Sulardan Geri Dönüştürülen Boyar Maddelerin Araştırılması

Öz

Türkiye denim kumaş üretiminde Dünya’nın önemli merkezlerinden biridir. Çözgü ipliği genellikle emdirme yöntem ile indigo ve/veya kükürt boyarmaddeler kullanılarak boyanmaktadır. Bu iki boyar maddenin ortak özelliği, suda çözünmemesi ve indirgenme reaksiyonu ile geçici çözünür özellikte boyama yapmasıdır. Atık sularda bulunan boyar maddelerin geri kazanımı hedeflenmiştir. İskur Denim’den alınan indigo ve kükürt boyarmaddeleri içeren atık sular, kimyasal flokülasyon tekniği kullanılarak çökertilmiş ve kurutma sonrası katı madde elde edilmiştir. Çöktürme işlemin ortamın pH’sı, karıştırma hızı ve çöktürme kimyasallarının konsantrasyonu etkin olmuştur. En iyi çökelme; pH 8-8.5 aralığında atık su numunesine AKKİM’den temin edilen floklaştırıcıların eklenmesiyle sağlanmıştır. Geliştirilen bağlayıcı ajanla birlikte, elde edilen çamur kondenzasyon reaksiyonuna tabi tutulmuştur. Atıkt sudan elde edilen indigo ve sülfür boyalardan en yüksek dolu moleküler yörüngenin ve en düşük boş moleküler yörüngenin enerji seviyeleri sırasıyla -4,78 eV ve -4,04 eV olarak dönüşümlü voltametri ile belirlenmiştir. Bu değerler orijinal boyar maddelere oldukça yakın değerler olup, boyama performansı için umut vermektedir.

Anahtar Kelimeler

• İndigo boyar madde
• Kükürt boyar madde
• Atık su
• Karbon ayak izi
• Denim

Kaynakça

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