In this research, the effect of different calcination temperatures of diatomite mineral (550, 750, 900°C) on the chemical and physical properties of aquaculture wastewater, solutions with specific nitrate concentration (25-85 mg/liter) and Pars alcohol factory wastewater was investigated. . The results show that the amount of EC in the treatment of raw diatomite is low, and with the calcination of diatomite, the ability to dissolve ions in water increases, but as the calcination temperature increases, the ability to dissolve again decreases. Therefore, the highest amount of EC was obtained in the treatment with 550 °C. Also, with the passage of time and the change of the environment from acidic to alkaline, the value of EC increased and its highest value was measured in the treatment with 550 clay at 48 hours in the alkaline environment of 1780.67 microsiemens/cm. Also, the data shows that raw diatomite increases turbidity, which decreases with calcination of diatomite. The results of the experiment conducted with aquaculture wastewater on a laboratory and pilot scale with two treatments of calcined diatomite at 550 and 750 degrees Celsius showed a significant reduction of nitrite (p<0.05) in the 750 clay treatment, while the TAN value in pilot scale had no effect. The results show that in general, raw diatomite increases turbidity and has no significant ability to adjust turbidity, EC, pH, hardness and alkalinity parameters. Therefore, it is better to turn it into clay to improve its performance, but between the temperatures of 550, 750 and 900 degrees Celsius, the best performance in adjusting pH, reducing turbidity, and reducing nitrate was observed in clay 550. The performance eva‎luation results of 550 clay on nitrate concentration indicated a significant reduction of nitrate in the alkaline environment in 550 clay, which increased the amount of nitrate absorption by increasing the contact time of clay and nitrate solution from one to three grams and from two to six hours. Also, with the increase in amount and time (contact between pottery and alcohol factory effluent), effluent pH was associated with a greater increase. So that the highest increase in pH was observed in the treatment of 3 grams of Sefal 550 and in 24 hours (0.2 units). According to the research results, 550 °C clay is suggested to the industry as a purifier due to its help in adjusting the pH of acidic effluents, increasing some aquaculture parameters in favorable conditions such as hardness, alkalinity and EC, and reducing some nitrogenous compounds and turbidity.

عيسي ابراهيمي درچه , اميدوار فرهاديان

محمدرضا دهقاني

يزدان كيواني , اميد بيرقدار كشكولي