Click for new scientific resources and news about Corona[COVID-19]

Paper Information

Journal:   MODARES TECHNICAL AND ENGINEERING   FALL 2008 , Volume - , Number 33 (SPECIAL ISSUE ON CIVIL ENGINEERING); Page(s) 45 To 59.
 
Paper: 

IMPACT OF CARBONATE ON THE EFFICIENCY OF ELECTROKINETICS METHOD FOR ZINC REMOVAL FROM CLAYEY SOILS IN A PILOT SCALE

 
 
Author(s):  SHARIATMADARI N.*, SAEIDIJAM S., OUHADI V.R.
 
* IRAN UNIV. OF SCIENCE AND TECHNOLOGY, TEHRAN, IRAN
 
Abstract: 
In geo-environmental engineering, electrokinetics is one of effective methods for contaminant removal from clayey soils. Even though kaolinite due to its low negative charge has the small capability for contaminant retention, the presence of carbonate causes a noticeable increase on contaminant retention. In spite of several research works which have been perfomled on the efficiency of electrokinetics remediation method, the impact of carbonate on such efficiency in a pilot scale has not been well investigated.
In this paper, the effect of carbonate calcium on the process of heavy metals removal by electrokinetics method on kaolinite soil and a clayey soil of liner of waste disposal site of Hamedan in laboratory in a pilot scale are investigated. Based on theoretical considerations, series of electrodes in pilot scale were designed and a series of pilot scale experiments were performed. In laboratory scale, kaolinite specimens were mixed with 4, 10, 15, 20, 25 and 30% calcite. Different concentrations of zinc nitrate were used as a source of heavy metal contamination. Batch tests were performed to define Zn (II) adsorption onto these samples. Series of electrokinetics experiments were carried out on these artificially prepared samples. The study showed that during the electrokinetics experiments, soils which have higher carbonate percentages prevent the development of an acid front. Therefore, an alkaline condition will form throughout the soil. This significantly lowers the efficiency of the method.
For pilot scale experiments, the electrodes were designed and made on the basis of theoretical patterns and were arranged in two rows by I-meter distance. The natural soil of clay liner of waste disposal site of Hamedan were artificially contaminated and were used as a soil sample for pilot scale experiments in previously designed site. The experiments were performed for 100 days. Results show that the Zn(II) decontamination was inefficient. This was attributed to the presence of 28% carbonate in the natural soil. Finally, monitoring of Zn distribution is presented.
 
Keyword(s): ELECTROKINETICS, ELECTRO-OSMOSIS, PILOT SCALE, SOIL REMEDIATION, CONTAMINANT RETENTION, CARBONATE, KAOLINITE, ZINC
 
References: 
  • ندارد
 
  Persian Abstract Yearly Visit 60
 
Latest on Blog
Enter SID Blog