Experimental study of iodine removal efficiency in self-priming venturi scrubber

• Fabrication, erection of experimental set up and carrying out experimentation with self priming venturi scrubber.
• Predicting solubility of iodine in water and its pH dependency.
• Increasing pH of water increases iodine removal efficiency.
• Maximum iodine removal efficiency is obtained at 10 pH of water using sodium thiosulphate.

The objective of present experimental study is to examine the iodine removal efficiency of a self-priming venturi scrubber for submerged operating condition. The venturi scrubber is used in Containment Filtered Venting System of nuclear power plants to remove the gaseous pollutants from contaminated gas during severe accidents. The experiment consists of mixing the iodine vapours with the air using suction venturi and pressure cooker system. The purpose of iodine mixing with air is to examine scrubbing performance of the designed venturi scrubber with water as scrubbing liquid. The performance parameters of venturi scrubber are expressed mainly in terms of pressure drop and iodine removal efficiency. The iodine removal efficiency of venturi scrubber is estimated for a series of two experiments by measuring the quantity of iodine in water from iodometric titration with four distinct pH of water. It has been experimentally observed that iodine removal efficiency is improved by using higher pH value of scrubbing liquid since solubility of iodine gets improved at higher pH.