ปัจจัยและประสิทธิภาพการกำจัดฟอสฟอรัสในน้ำเสียจากกิจกรรมซักล้างโดยการตกตะกอนด้วยสารส้ม

Abstract

The study of the efficiency of removal phosphorus from washing wastewater by chemical coagulation using alum with Jar Test method. In the experiment, 5 parameters of the independent variable were determined: 1) alum dosage (100 150 200 and 250 mg/l) 2) high rotating speed (100 150 200 and 250 rpm) 3) time of high rotating speed (1 2 3 and 4 minutes) 4) low rotating speed (20 30 40 and 50 rpm) 5) time of low rotating speed (10 15 20 and 25 minutes). The experiment was done in 3 replicates and analyzed to find the mean of efficiency of removal phosphorus. The results showed that the suitable parameters for chemical coagulation with alum were at alum dosage of 200 mg/l, high rotating speed 250 rpm, time of high rotating speed 1 minute, low rotating speed 30 rpm and time of low rotating speed 10 minutes, which can remove 100% phosphorus from washing wastewater and reduce COD 63.96%. In the analyzing of the experimental results with statistical One-Way ANOVA test found that the alum dosage significantly improved the treatment efficacy of phosphorus removal. Conversely, the level of high rotating speed, time of high rotating speed, low rotating speed and time of low rotating speed had no significant effect on the efficiency of phosphorus removal.