4TH International Congress on Technology - Engineering & SCIENCE - Kuala Lumpur - Malaysia (2017-08-05)

Removal Of Some Heavy Metals From Sewage Water Using Natural And Modified Rice Straw
In this study, sewage water sample was treated using agricultural wastes such as natural and modified rice straw to reduce pollutant ratios especially heavy metals which cause harmful effects where they are non-biodegradable and can be accumulated in living tissues, causing various diseases and disorders. Different ratios of rice straw mixed with sand were used for removal of heavy metals from sewage water sample. The highest removal of heavy metals was at ratio of rice straw and sand (1: 1). The highest removal of heavy metals was after filtration of sewage water sample two times than after filtration one time. Factors affecting removal of heavy metals from sewage water sample using rice straw such as effect of temperature, particles size, initial iron concentration, contact time, pH, adsorbent amounts and foreign ion interference were studied. The highest removal of heavy metals was achieved after drying of rice straw at 80 0C, at particle size (0.1 mm) and when mixed with sand at ratio (1: 1). The highest removal of iron from solution using mixture of sand with rice straw was achieved at concentration 0.9 mg/L and pH 8. The equilibrium point for removal of iron from solution was reached after contact time 50 min. By increasing the adsorbent amount of rice straw, the removal efficiency of iron would increase. By increasing positive charge of interfered ions with iron, the removal efficiency would decrease.
Keywords: Sewage water, Heavy metals removal, Cellulose, Rice straw, Adsorption, Bleaching and pulping
Khaled Elgendy, Muneir Saad, Sherif Sobhy