International Journal of Advanced Research and Development

Authors
Shahzada Zakria Owas

Abstract
The present study estimates the removal of dye by using natural coagulants from synthetic textile wastewater Aluminumsulfate (alum), ferrous sulphate, ferric chloride and ferric chloro-sulphate were commonly used as coagulants. However, a possible link of Alzheimer’s disease with conventional aluminium based coagulants has become an issue in wastewater treatment. Hence, special attention has shift towards using biodegradable polymer, chitosan in treatment, which are more environmental friendly. Moreover, chitosan is natural organic polyelectrolyte of high molecular weight and high charge density which obtained from deacetylation of chitin. Experiments were carried out on textile industry wastewater by varying the operating parameters, which are chitosan dosage, pH and mixing time in order to study their effect in flocculation process by using chitosan. The results revealed that chitosan had successfully flocculated the anionic suspended particles and reduce the levels of chemical oxygen demand and turbidity in textile industry wastewater. The optimum conditions for this study were at 50 mg/l of chitosan, pH 4 and 20 minutes of mixing time with 100rpm mixing rate for 1 minute, 40 rpm of mixing rate for 20 minutes and 30 minutes of settling time. Moreover, chitosan showed the highest performance under these conditions with 74% of dye reduction.