Global NEST Journal

ISSN:

Print ISSN: 1790-7632

Electronic ISSN: 2241-777X

Issue 2

Volume number:

11

Publication year:

2009

Publication month:

July

Editorial:

115_11-2_Foreword.pdf

Papers presented at 2nd International Conference on Engineering for Waste Valorisation - WasteEng2008, 3-5 June 2008, Patras, Greece

Articles

Using wood and bone ash to remove metal ions from solutions

Chojnacka K. and Michalak I. , Pages:205-217

DOI:

https://doi.org/10.30955/gnj.000582

Paper Topic:

General

Issue:

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Abstract

In 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 sulphide

Shareefdeen Z.Μ. , Pages:218-222

DOI:

https://doi.org/10.30955/gnj.000583

Paper Topic:

General

Issue:

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Abstract

Industrial 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 Remediation

Dhodapkar R., Borde P. and Nandy T., Pages:223-234

DOI:

https://doi.org/10.30955/gnj.000586

Paper Topic:

General

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Abstract

Laboratory 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 processes

Murthy Z.V.P. and Chaudhari L.B., Pages:235-240

DOI:

https://doi.org/10.30955/gnj.000581

Paper Topic:

General

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Abstract

The 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 electrodeposition

Masavetas 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.000595

Paper Topic:

General

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Abstract

During 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.

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Issue 2

Articles

Using wood and bone ash to remove metal ions from solutions

Development of a biofilter media for removal of hydrogen sulphide

Super Absorbent Polymers in Environmental Remediation

Treatment of distillery spent wash by combined UF and RO processes

Production of copper powder form printed circuit boards by electrodeposition

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