ประสิทธิภาพการกำจัดโลหะหนักบางชนิดในน้ำเสียจากอุตสาหกรรมแผงวงจรพิมพ์ด้วยตัวกลางเศษคอนกรีต / ทศพร ภู่ระหงษ์ = Efficientcy of some heavy metal removal from printed circuit boards industrail waste water by concrete rubbish media / Thossaporn Poorahong
This is a laboratory scale experiment to study the efficiency of concrete rubbish to remove 5 metals in waste water from printed circuit boards industrial. The experiment was divided into 3 parts. First was physical study of concrete rubbish properties which found that concrete rubbish has 10.5057 sq.m./g surface area. For concrete rubbish size distribution there are 15.00%, 46.67% and 27.67%by weigh for 0.5-0.6mm.,0.6-0.8 mm. and 0.8-1.0 mm. respectively and cation exchange capacity is 30.1 cmole/Kg concrete. The second was batch experiment to determine contact time, suitable pH and adsorption isotherm for removes Cr[superscript 3+] Cu[superscript 2+] Ni[superscript 2+] Pb[superscript 2+] and Zn[superscript 2+] from 10 mg/L synthetic waste water. From batch study found that Freundich isotherm can use to describe the adsorption process. Freundlich isotherm for each metal are y = 0.1348X[superscript 0.4525], y = 0.7724X[superscript 0.2531], y = 0.7416X[superscript 0.3410], y = 0.1034X[superscript 1.8844] andy = 0.7398X[superscript 0.4458] for Cr, Cu, Ci, Pb, and Zn respectively. The third was 1.80-m. depth adsorption column which found that concrete rubbish has maximum 50% removal efficiency for Cu, Ni, Pb and Zn in waste water form printed circuit boards with in 30 hr. operation.