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The industry of stone cutting is one of the largest active industrial sectors and considered a major economic factor worldwide (1-2). During the cutting process, two types of solid and semiliquid waste are produced (2-3). Stone slurry is a semi-liquid material consisting of particles following the use of water in order to facilitate cutting, cooling devices and prevent dust generated in this industry (2,4). Studies show that about 20 percent of the total weight of the stone block is converted into slurry. The combination of slurry produced in the stone industry contains 96% water and is about 4% solid. Stone cutting industries are one of the industries with high consumption of water (1,56). Annual production of approximately 700,000 to 1,000,000 tons of slurry (7) and a prohibition of its discharge to public health systems have led to many problems in terms of disposal, environmental pollution and health risks (6,8-10). The discharge of these substances leads to the deposition of solid material in the downstream agricultural lands, A-R-T-I-C-L-EI-N-F-O A-B-S-T-R-A-C-T Article Notes: Received: Sep 13, 2018 Received in revised form: Feb 24, 2019 Accepted: Feb 28, 2019 Available Online: Marc 14, 2019 Background & Aims of the Study: In this study three types of starch such as wheat, corn and potato were used as natural coagulants for turbidity removal of wastewater in stone cutting industry using jar test and their performance was compared with that of alum. Materials & Methods: This study is an analytical-applied. Natural wastewater from stone industry was used. The conventional jar test apparatus was utilized in all the coagulationflocculation experiments. To evaluate the effect of gelatinized starch, the solution was prepared in both autoclaved and non-autoclaved forms. The effect of pH and coagulant doses were investigated in this study. Results: It was found that with regard to the effect of control sample from autoclaved starches, potato starch with a pH of 6 had the highest removal rate with 4.78% and among non-autoclaved starches, wheat starch with a pH of 7 had the maximum turbidity removal rate with 9.53%. Conclusions: The results showed that the non-autoclaved wheat starch has more efficiency in turbidity removal from wastewater in stone cutting industry than other starches.

The Performance of Starch as a Natural Coagulant for Turbidity Removal from Wastewater in Stone Cutting Industry