Alternative cleaning of compost leachate using biopolymer chitosan
Compost leachate poses a threat to the environment because it contains many organic and inorganic pollutants. Chemical Oxygen Demand (COD) has been reported at values above 5000 mg/l O2. Heavy metals, such as nickel, lead, chromium are also present within these waters. Thus, in order to comply with the increasingly stringent environmental quality standards such contaminants must be removed effectively. The research approach in this paper is directed towards chelating pre-treatment procedures. Nontoxic and biodegradable biopolymer chitosan was used as a chelator for the removal of dissolved metals from compost leachate. The influence of chemical conditions regarding the chelation efficiency was studied in model solutions. The optimal treatment conditions were applied onto compost leachate which was analysed further regarding metals. In addition, the influence of chitosan was studied on compost leachate toxicity. The most important aspect of this paper is to demonstrate the potential of waste chitosan recycling. Thus, the chitosan chelates were subjected to the electrospinning procedure in order to develop new nano-porous structures, such as, for example, conductive textiles.
KeywordsCompost leachate Biopolymer chitosan Metal removal Toxicity Waste recycling Electrospinning
Unable to display preview. Download preview PDF.
- 6.M. Benavente, “Adsorption of Metallic Ions onto Chitosan: Equilibrium and Kinetic Studies”, Licentiate Thesis, Sweden, 2008.Google Scholar
- 8.L. Fras Zemljič, T. Ristić, and T. Tkavc, J. Eng. Fiber. Fabr., 7, 50 (2012).Google Scholar
- 10.A. Greiner and J. H. Wendorff, Nagewandte Chem., 46, 5670 (2007).Google Scholar
- 13.ISO 11348-2:2007, Water Quality. Determination of the Inhibitory Effect of Water Samples on the Light Emission of Vibrio fischeri (Luminescent Bacteria Test). Part 2: Method Using Liquid-dried Bacteria, 2007.Google Scholar
- 14.[ISO 6341/1996, Water Quality. Determination of the Inhibition of the Mobility of Daphnia Magna Straus (Cladocera, Crustacea) -Acute Toxicity Test, 1996.Google Scholar
- 16.Official Gazette of Republic of Slovenia, No64/2012, Decree on the Substance and Heat Emission in the Wastewater Discharge into Recipient and Public Sewage System, 2012.Google Scholar