Abstract
The present study was conducted to explore the efficiency of water hyacinth (Eichhornia crassipes) to cleanup of tannery effluent in terms of pH, TDS, EC, BOD and most importantly Cr. The study period was from November, 2013 to April, 2014. After 7 days of treatment by water hyacinth, the removal rates were: 68.15% for BOD, 59.82% for TDS and 46.56% for EC, where the corresponding rates after 15 days were: 81.73% for BOD, 67.15% for TDS and 61.93% for EC. After treatment with water hyacinth, pH of effluent reached to nearly neutral level from alkaline condition. In this study, major focus was on Cr removal and the treatment of tannery effluent using water hyacinth resulted in 32.42% reduction of Cr after 7 days and 54.72% after 15 days. The present results revealed that water hyacinth had the strong capability of absorbing Cr. On the other hand, the reduction rates after 15 days for sedimentation were: 54.23% for BOD, 30.21% for TDS, 22.28% for EC and 14.37% for Cr. After comparing the two treatment processes, it was found that the reduction rate by phytoremediation process was much higher than that of sedimentation process. This result reflected the high efficiency of water hyacinth to reduce pollutant especially Cr from tannery effluent as eco-friendly sustainable technology.Res. Agric., Livest. Fish.4(3): 151-156, December 2017
Highlights
Water pollution is a worldwide issue; accumulation of different heavy metals in water has become very common phenomena
This study aims to determine the suitability of water hyacinth (Eichhornia crassipes) for phytoremediation of Cr and some chemical parameters like pH, total dissolved solids (TDS), electrical conductivity (EC) and biological oxygen demand (BOD) from tannery effluent
Water hyacinth samples were collected in polythene bags from nearby ponds of Mawlana Bhashani Science and Technology University (MBSTU) Campus, Tangail
Summary
Water pollution is a worldwide issue; accumulation of different heavy metals in water has become very common phenomena. There has been an increasing concern with regard to accumulation of heavy metals in environment as they pose big threat to both human health and natural environment. In Bangladesh, water pollution with heavy metal is severe where small industrial units are pouring their untreated effluents in the surface drains, which are degrading both of the surface and ground water quality (Borkar et al, 2013). Tannery effluents are ranked as the highest pollutants among all industrial wastes (Belay, 2010). Among various wastes discharged from tanning industries, heavy metals are the most concerning factor. Along with heavy metals tannery effluent contains substantial pollution load such as pH, total dissolved solids (TDS), electrical conductivity (EC) and biological oxygen demand (BOD)
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