การสกัดแยกไอออนปรอทในรูปของ (HgCl₄)²⁻ ออกจากน้ำทิ้งที่ได้จากหลุมขุดเจาะก๊าซธรรมชาติด้วยเยื่อแผ่นเหลวที่พยุงด้วยเส้นใยกลวงและ การทำนายผลด้วยแบบจำลองทางคณิตศาสตร์ / ยศินทร์ ยางทอง = Separation of mercury as (HgCl₄)²⁻ from natural gas well produced water via hfslm and prediction by mathematical model / Yasin Yangthong
Separation of mercury ions (HgCl₄)²⁻ from natural gas well produced water through hollow fiber supported liquid membrane (HFSLM) is the main objective of this research. The several parameters were investigated: concentration of extractant (Aliquat 336 and TOA), concentration of HCl in feed solution, concentration of thiourea in striping solution and flow rate. In additional, the separation system efficiency of 2 hollow fiber modules in batch system was also studied. As a result, the separation system of 2 modules obtains the efficiency of mercury ion separation higher than the separation system of 1 module also obtains. From the experiment, the maximum percentages of extraction and recovery at: 4% (v/v) Aliquat 336 in both the first and second hollow fiber modules, 0.2 M HCl in feed solution, 0.1M thiourea as the stripping solution and the flow rate of 100 mL/min were 99.89% and 95.45%, respectively. The mercury level in feed decreased to below waste water discharge limit issued by Ministry of Industry, Thailand. For the mathematical model, the mass transfer at low concentration conditions with linear equation behavior is the main idea. At steady state condition, the constant of extraction (kf) and recovery (ks) as 215.43 and 0.236, respectively were achieved. The mathematical model can predict the concentration of mercury ions in the output feed and stripping at various times to be accurately obtained at steady state condition.
