Arsenic Adsorption Into the Fixed Bed Column From Drinking Groundwater

Abstract

One of the main goals of the World Health Organization (WHO) and its Member States is that "all people, regardless of their stage of development and their social-economic condition, have the right to have access to adequate drinking water". The problem of remediation of waters contaminated with toxic substances, using natural resources, is a special concern at a high level. Researchers' efforts have sought to find effective and cheap ways to reduce the impact on the environment. As(III) gets into the environment from a variety of natural and anthropogenic sources. As As(III) is commonly found in rocks, soil or sediments, these sources are particularly important determinants of the As(III) zonal level in groundwater and surface water. As(III) contamination is currently one of the major problems with serious consequences on the biosphere. The main objective of this paper is the establishment of a method for the removal of As(III) from real waters by adsorption in a fixed bed column, using ecological materials, friendly to the environment. For this reason, the content of As(III) in groundwaters in the Romania-Hungary border area was determined, knowing the fact that the Pannonian Basin was given special attention, being an area heavily affected by As(III) contamination of natural water sources. The paper studies the adsorption of As(III) from a natural water taken from the monitored area. At the same time, it has followed the behaviour of microorganisms naturally existing in the soil of Timisoara city and in the Bega river in the presence of different amounts of As(III) in order to establish the relative toxicity of As(III) in them.

Synthesis, Characterization and Adsorptive Performances of a Composite Material Based on Carbon and Iron Oxide Particles

“…Based on experimental data obtained during preliminary attempts [34], the optimum conditions were established for synthesis of the desired composite material at different temperatures. So, when the synthesis was conducted at 45 °C, the reaction mass had to be stirred for 240 min (S2), at 55 °C the reaction mass had to be stirred for 45 min (S1), and at 58 °C the reaction mass had to be be stirred for 20 min (S3).…”

“…These quantities of precursors were calculated in order to obtain a final ratio of Fe:C equal to 1:10. This ratio was chosen because the experimental data showed that the usage of higher quantities of iron chloride was not recommended because it leads to starch gelatinization, simultaneously it was proved that smaller ratio leads to a composite material with a lower efficiency in various applications [34].…”

Characterization of Bottom Ash Waste Adsorbent from Palm Oil Plant Boiler Burning Process to Adsorb Carbon Dioxide in a Fixed Bed Column

“…As the contact time increases, the amount of adsorbate adsorbed to the adsorbent surface becomes higher until the equilibrium point is reached. Excessive contact time between adsorbent and adsorbate causes adsorbent to be saturated and detached from adsorbate [23][24][25].…”