摘要：Suspended materials in irrigation water are very important for the economic life of pressured ir- rigation systems. This study analyzed the effective- ness of pumice and sand-gravel media in removing suspended solids from irrigation water. Sand-gravel and pumice media passed through 0.05-2 mm and 2- 4 mm sieve openings were used. Raw water with a sediment concentration of 250 mg/L was passed through the media filters under the operating pres-sure of 100 kPa. For each hour of process time, thedischarge velocities measured and the sediment con- tents determined via the gravimetric method. Total cumulative flow volumes for sand-gravel and pum-ice media were 12897 L and 14035 L respectively, after the 30 h operating period. The discharge veloc- ities were changed between 47.71 m/m/h and 3.22 m/m2/h for sand-gravel medium, and 49.46 m3/m'/hand 3.44 m3/m?/h for pumice medium. Based on the analyses, we found that the sediment contents and discharge velocities decreased as the total amount of treated water increased in both sand-gravel and pum-ice media filters. Layers created of small size weremore effective than the other layers at removing thesolid particles. Based on the amount of the sediment measured of the treated water, it can be said that the sand-gravel medium was more effective than the pumice medium.
