What is it about?

VPum and VSco are aboundantly found in many parts of the world. Thus, low-cost adsorbents, pumice (VPum) and scoria (VSco) were investigated for the removal of Cu(II) as function of various parameters using batch experiments observing the influence of Cd(II) and Ni(II) alongside. Kinetic data showed a trend of fast removal at initial stages, thereby achieving maximum adsorption after 1 h agitation. Adsorption capacity were found 1.432 and 1.015 mg/g using VPum and VSco, respectively. This work showed the promising nature of pumice and scoria to effectively remove copper from water.

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Why is it important?

-The adsorbent used is cost effective and applicable easily -The nature of adsorbents, microvesicular texture, and porosity enhance surface area and is promising for amending too.


Chromium (VI) is a highly toxic metal ion found in the priority list of pollutants, which is also often abundant in areas having low access to high-tech solutions for chromium (Cr) removal. This study was initiated to investigate the capacity of home-use refrigerators to generate fresh water free from Cr(VI) by melting ice produced from Cr(VI) polluted water. Simulated tap water samples as well as deionized water to which different concentrations of Cr(VI) were added were frozen in a closed freezer unit. The effects of initial concentration, time of ice nucleation, fraction of ice volume, and influence of co-occurring ions were evaluated in relation to the quality of the produced ice. The physicochemical characteristics of the produced ice cubes were also evaluated. A high total water recovery of up to 85% was achieved. Chromium removal ranged from 57.4 to 80% for simulated tap and from 93 to 97% for deionized water spiked with Cr. The energy consumption estimation basing form the refrigerator amounted to 0.076 kWh. Freeze desalination was found to be relatively viable desalination technology in terms of quality of water produced, easiness for safe water production, and amount of energy consumed, especially where high-tech solutions for Cr(VI) removal are not available.

Dr. Fekadu Melak Assaye
Jimma University

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This page is a summary of: Use of porous volcanic rocks for the adsorptive removal of copper, Water and Environment Journal, February 2017, Wiley, DOI: 10.1111/wej.12234.
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