Effect of Vermifiltration on COD and Color Removal from Textile Factories’ Waste Water

Document Type : Original Article


1 Environmental Health Engineering Department, Health School, Kashan University of Medical Sciences, Kashan, Iran

2 Center for Solid Waste Research, Institute of Environmental Research, Tehran University of Medical Sciences, Tehran, Iran

3 Deputy of Education, Kashan University of Medical Sciences, Kashan, Iran


Aims Textile industries are among the manufactures which produce the highly polluted
waste water. The purpose of this research was to evaluate the effect of vermifiltration on
COD and color removal from textile waste water.
Materials & Methods This experimental research was performed March to August 2014 in
one of the textile factories of Kashan region, Iran. The glass cubic kits with- without Eisenia
fetida were used to filter the waste water samples. Data was analyzed using Kruskal–Wallis
and two-way analysis of variance in SPSS 19 statistical software.
Findings The mean of COD concentration in the raw waste water samples was
1324.24±757.01mg/l which was decreased to 598.22±349.33 and 831.32±445.19mg/l after
the experimental and control kits usage, respectively (p<0.001). The mean of color intensity
in raw waste water samples was 51.2±30.6% which was decreased to 27.8±15.0 and
27.4±15.1% (p=0.635) in experimental and control kits, respectively. There was a significant
negative correlation between COD removal and hydraulic loads (p<0.001; r=-0.804) and a
significant negative correlation between color removal and hydraulic loads (p<0.001; r=-
0.278) in both experimental and control kits.
Conclusion The most important risk groups in our study were abattoir workers, butchers,
housewives and students who handle infected animals.