Issue 2 [July]( Papers presented at 2nd International Conference on Engineering for Waste Valorisation - WasteEng2008, 3-5 June 2008, Patras, Greece )Editorial Using wood and bone ash to remove metal ions from solutionsChojnacka K. and Michalak I. , Pages:205-217 DOI: https://doi.org/10.30955/gnj.000582Paper Topic: General Issue: Issue 2Get Full Paper AbstractIn the present work, wood and bone ash were used to remove metal cations from solutions. Cation-removal capacity of the ashes was analyzed by potentiometric titration. It was found that the capacity of wood ash was two times higher (37.3 meq g-1) than bone ash (15.2 meq g-1). Kinetics of metal ions removal by both ashes was described with pseudo-second order equation and Langmuir model was employed to describe equilibrium of the process. Wood ash had better removal properties than bone ash - at the same experimental conditions biosorption capacity at equilibrium for wood ash was 2 times higher (244 mg g-1) than for bone ash (123 mg g-1). Promising results were also obtained for wood ash, which was capable of removing 67.9 % of Zn(II) ions, 70.4 % of Cd(II) ions, 92.8 % of Cu(II) ions and 99.1 % of Cr(III) ions from model solution of wastewater from metallurgical industry and 84.5 % of Cr(III) ions from the postbiosorption solution from the production process of biological feed additives. The utilization of ashes of biological origin was found to be a promising alternative to conventional processes of wastewater treatment. Development of a biofilter media for removal of hydrogen sulphideShareefdeen Z.Μ. , Pages:218-222 DOI: https://doi.org/10.30955/gnj.000583Paper Topic: General Issue: Issue 2Get Full Paper AbstractIndustrial facilities emit pollutant air that contains volatile organic compounds (VOCs) and reduced sulphur compounds (RSCs) which are nuisance, corrosive to materials and dangerous to health. In recent years, biofiltration has replaced numerous conventional processes (i.e. adsorption) due to its more effective, economical and environmental benefits. Thus, increasingly industrial facility operators are adopting biofilters for removal of air pollutants. Biofiltration takes place in bioreactors that are packed with media particles. On these media particles micro-organisms form biofilms where biological oxidation takes place. The new biofilter media developed in this study consists of a base material, hydrophobic coatings, nutrients and binding agents. In this contribution, method of development, evaluation and performance of this new bioreactor media are discussed. Super Absorbent Polymers in Environmental RemediationDhodapkar R., Borde P. and Nandy T., Pages:223-234 DOI: https://doi.org/10.30955/gnj.000586Paper Topic: General Issue: Issue 2Get Full Paper AbstractLaboratory studies reported earlier, have shown very promising results in the selective removal of dyes from aqueous solutions by a commercially available (super absorbent polymer) SAP, Jalshakti® (JS). JS is mesoporous in nature and is a potential adsorbent for the basic dyes studied. This paper presents the adsorption and kinetic studies for the Methylene blue dye (MB) in a batch mode. The equilibrium adsorption capacity increases from 138.9 to 1428.6 mgg-1 as the initial concentration of MB increases from 100-1000 mg l-1. The maximum adsorption capacity obtained is 1200 mgg-1 which is more than the adsorbents reported in literature. The Kf value is 165.3 mg1-(1/n)g-1L1/n. The slope 1/n, ranging between 0 and 1, is indicative of the relative energy distribution on the adsorbent surface (or surface heterogeneity) The kinetics of the adsorption process suggests that the pseudo second order model is predominant. The pore diffusion kinetics as described by intraparticle diffusion model also controls the adsorption process but is not the only rate limiting mechanism. Treatment of distillery spent wash by combined UF and RO processesMurthy Z.V.P. and Chaudhari L.B., Pages:235-240 DOI: https://doi.org/10.30955/gnj.000581Paper Topic: General Issue: Issue 2Get Full Paper AbstractThe present study deals with the treatment of distillery spent wash by an ultrafiltration (UF) membrane followed by reverse osmosis (RO) membrane on a pilot scale membrane setup. The performance of the system was evaluated by varying applied pressure on the thin-film composite polyamide (TFC-PA) UF and RO membranes. In the first stage, UF experiments are carried out for concentration of effluents by removing the suspended solids (SS). RO has effectively separated the total dissolved solids (TDS), chemical oxygen demand (COD), biochemical oxygen demand (BOD), sulphate and potassium with the rejection efficiency of 97.9%, 96.8%, 97.9%, 99.7% and 94.65%, respectively. UF was effective for the separation of SS with the rejection efficiency of 95.5%. The pollutant level in permeate are below the maximum contaminant level as per the guidelines of the World Health Organization and the Central Pollution Control Board (CPCB) of India specifications for effluent discharge (less than 1000 ppm of TDS and 500 ppm of COD). Production of copper powder form printed circuit boards by electrodepositionMasavetas I., Moutsatsou A., Nikolaou E., Spanou S., Zoikis-Karathanasis A., Pavlatou E.A. and Spyrellis N., Pages:241-247 DOI: https://doi.org/10.30955/gnj.000595Paper Topic: General Issue: Issue 2Get Full Paper AbstractDuring the last years, the waste electrical and electronic equipment (WEEE) are gathering attention, as a very special section of waste. In fact, they have been proven to be source for the recovery of metals. In the present study printed circuit boards (PCBs) were cut and treated thermally at 500oC for 1 h in both air and nitrogen atmosphere. The obtained material was dissolved in three different acid media HNO3aq, HClaq and H2SO4aq, in order to extract copper. The achieved Cu recovery percentages were 97.5, 65 and 76.5% respectively. Electrodeposition technique was applied in order to recover copper in powder form. More than 98% of copper was recovered achieved by application of high current density resulting to dendritic structure of copper. The applied process was characterised by a high current efficiency and led to the production of copper powder of 80 μm mean diameter appropriate for powder metallurgy applications. Pages« first ‹ previous 1 2
