عنوان مقاله [English]
نویسندگان [English]چکیده [English]
The shortage of irrigation water with suitable quality for use in domestic, irrigation and industrial sectors is one of the most important problems in arid and semi-arid regions that include one-third area of the world. There is a progressive request for low quality water in regions, due to fresh water shortage. Therefore, many efforts have been taken place to decrease water salinity and increase the quality of abnormal waters such as saline and brackish waters. In this research, the impact of wheat straw and sawdust in sand filters on the physical and chemical properties of water was investigated and compared. For this purpose, saline water passed through a column of pure sand, a column of mixed wheat straw and sand and a column of mixed sawdust and sand, all having the same weight. The turbidity, hardness, chloride anions, magnesium and calcium cations concentration were measured with time. The results showed that the highest sorption of chloride anions (30 percent), magnesium (22 percent) and the maximum reduction of turbidity (74 percent) and hardness (19.27 percent) were achieved by passing water through straw wheat, but the sawdust had the most impact on electrical conductivity reduction (6.34 percent) and removal of calcium cations (23.7 percent) from saline water.