TITLE:
Iranian Natural Red Soil and Its Modified Form with EDTA for Removal of Phosphorous from Aqueous Solution
AUTHORS:
Mansur Zarrabi, Reza Ali Falahzadeh, Mohammad Shakak, Mojtaba Sadeghnia, Ahmad Fattahi, Shahram Sadeghi
KEYWORDS:
EDTA, Red Soil, Phosphorus, Batch System
JOURNAL NAME:
Open Access Library Journal,
Vol.2 No.10,
October
26,
2015
ABSTRACT:
In water, removing excessive amounts of phosphorus
is necessary to prevent eutrophication. Phosphorus can be seen usually in the form of organic phosphate and
inorganic phosphate in surface waters and wastewater. Phosphates are one of the
main materials of many factories and industries and it is a major factor in the
development and control of water resources eutrophication. The purpose of this
study is the survey of potential use of red Pumice Stone of western Azerbaijan
region and its Modified form by EDTA for remove phosphate from aqueous
solutions. In this study, we used the red soil of western Azerbaijan region to
remove phosphorus from simulated solutions. All experiments were performed in a
batch system. The effect of various parameters such as reaction time, initial
concentration of phosphorus, pH and dissolved amount of adsorbent on the removal
efficiency of the process was studied. The results showed that the removal
efficiency increased with increasing contact time, adsorbent dose and initial
concentration of phosphate ions. The highest efficiency occurred in 150 minutes
of reaction time with 10 g/L adsorbent and 50 mg/ L dissolved
phosphate concentration at the pH 5. In optimal conditions, using of raw
sorbent removed about 65 percent of the phosphate ion and with the modified
inorganic Pumice removed about 78 percent of phosphorus ions. In general,
results showed that raw red soil was able to remove phosphate ions in the
acceptable range due to high calcium levels in soil context. And its removing
ability will increase significantly if modified by EDTA.