Textile Wastewater Treatment by Combination of Chemical and Phytoremediation Processes

Document Type: Original Research Paper

Authors

1 1. Department of Environmental Science and Disaster Management, Noakhali Science and Technology University, P. O. Box 3814, Noakhali, Bangladesh 2. Department of Environmental Sciences, Jahangirnagar University, P. O. Box 1342, Dhaka, Bangladesh

2 Department of Environmental Science and Disaster Management, Noakhali Science and Technology University, P. O. Box 3814, Noakhali, Bangladesh School of Environmental Science, University of Shiga Prefecture, P.O. Box 522-8533, Shiga, Japan

3 Department of Environmental Science and Disaster Management, Noakhali Science and Technology University, P. O. Box 3814, Noakhali, Bangladesh

4 Department of Environmental Sciences, Jahangirnagar University, P. O. Box 1342, Dhaka, Bangladesh

5 Department of Environmental Science and Disaster Management, Noakhali Science and Technology University, P. O. Box 3814, Noakhali, Bangladesh Research Cell, Noakhali Science and Technology University, P. O. Box 3814, Noakhali, Bangladesh

Abstract

In the present investigation, coagulation-flocculation and fenton process in conjunction with phytoremediation by water hyacinth (Eicchornia crassipes) were applied to treat the most frequently occurred contaminants in textile wastewater. The mean values of EC, TDS, turbidity, pH, DO, BOD, COD and TOC in the raw effluents were 2300 μSCm-1, 1260 mgL-1, 48.28 FTU, 10.5, 1.2 mgL-1, 265 mgL-1, 522 mgL-1 and 12.8 mgL-1, respectively whereas the average concentration of Cr, Pb, Mg, Cu, Ni and Zn was 0.86, 1.21, 10.97, 0.47, 2.85 and 0.52 mg/L, correspondingly which evidently indicated that the effluents were highly contaminated compared to Bangladeshi standard. The results demonstrated that the values of EC, TDS, turbidity, pH, BOD, COD and TOC reduced significantly compared to raw effluents by both coagulation-flocculation and fenton processes and meet the standards set by BDS-ECR except BOD and DO. After being treated the COD value reduced to 70 mg/L (86.56%) and 188 mg/L (63.985%) from its initial concentration by coagulation-flocculation and fenton process, respectively on the other hand TOC removal efficiency by coagulation- flocculation process was 97.8125%, significantly greater than fenton methods where removal efficiency was 63.9%. However, the BOD removal efficiency by both treatment processes was ~50% which was not satisfactory compared to local standard. Interestingly, the concentration of DO increased substantially by both coagulation-flocculation (1.2 to 4.4 mg/L) and fenton process (1.2 to 3.85 mg/L). In case of trace elements removal, the combination of coagulation-flocculation-water hyacinth and fenton-water hyacinth show promising results where the removal efficiency of coagulation-flocculation-water hyacinth and fenton-water hyacinth was 24%-76% and 17%-76.36%, respectively. Therefore, it can be concluded that coagulation-flocculation-water hyacinth combination is better than fenton-water hyacinth combination in terms of trace metals removal. Textile effluents treatment and management is considered as one of the most significant issues in Bangladesh herein based on the this study, combination of chemical and phytoremediation technologies could be a promising sustainable low cost alternative for Bangladesh’s textile industrial sector.

Keywords


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