Colour Removal from Biologically Treated Textile Dyeing Wastewater with Natural and Novel Pre-Hydrolysed Coagulants

Year 2018, Volume: 5 Issue: 1, 23 - 36, 15.12.2017

G. Yıldız Töre , R Ata S. Özden Çelik Ş Kırhan Sesler

https://doi.org/10.18596/jotcsa.370752

Cited By: 2

Abstract

In this paper, natural (chitosan and
starch) and novel pre-hydrolysed coagulants (PACl, PAFC, PFS and PFC) were performed
with coagulant aid for colour removal from a biologically treated textile
wastewater including multiple dyes (indigo and reactive). According to the
experimental results, optimum coagulant dosages which provide the best colour
removal for PACl, PAFCl, PFS (%10) and PFCl (%10), were determined as 80 mg/L,
10 mg/L, 3 mg/L and 40 mg/L, respectively, at pH 4 and pH 6,98 (natural pH of
studied wastewater, pHnww). Maximum colour removal was determined as 97% for
PAFCl, minimum removal was 23% for PFCl at pH 4, while it was calculated as 75%
and 52% at pHnww. COD removal was observed as 45% at pH 4 and 55% at pHnww for maximum
colour removal. Sludge production rate was measured as 71 kg/d while this rate
was found as 60 kg/d at pHnww. On the other hand colour removal efficiencies
were determined in the range of 55-88% at pHnww and pH 3 for chitosan while it
was calculated as 52% for starch at pHnww and pH 9. According to the results, PAFCl
and chitosan were found as the best coagulants for colour removal of
investigated textile wastewater. According to the economic analysis results, the best colour
effiency were found as 97% with PAFCl and the second best colour removal were
found as 88% with Chitosan. Due to lower sludge production than PAFCl and lower
chemical costs; Chitosan can be considered as a reasonable alternative for this
wastewater.

Keywords

Natural and Novel pre-hydrolysed coagulant, Colour removal, Textile wastewater, PAFCl, Chitosan

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