Purpose: to test the physicochemical and sorption treatment of drainage and wastewater from a rice irrigation system.
Materials and methods. The process simulation which involved sequential treatment of water with aluminum oxychloride coagulant, aeration, and a single filtration through clinoptilolite was performed. To determine the effect of aeration duration on the amount of sediment formed, two experiments were conducted: after adding the coagulant, the forced aeration was performed for 5 and 30 minutes, with the air flow rate in both cases being 10 % of the water flow rate.
Results and discussion. The experiments proved that the sediment weight after five minutes of water aeration and settling for 1.5 hours is 0.365 g per 1 liter of treated water, and it is 0.36 g after thirty minutes of aeration and subsequent settling. After five minutes of aeration and settling, the iron content in treated water decreased by 81 %, manganese by 97 %, and nickel by 20 %. With single filtration through clinoptilolite, the iron concentration decreased by 41 % compared to the previous stage of purification, manganese by 50 %, copper by 33 %, lead by 72 %, zinc by 33 %, nickel by 41.5 %, and cadmium by 31.25 %. After 30 minutes of aeration and settling, the concentrations of the above-mentioned metals decreased by 88, 97, and 20 %, respectively, as well as cadmium by 19 %, requiring repeated zeolite filtration.
Conclusions. The effectiveness of physicochemical and sorption purification of drainage and wastewater from a rice irrigation system using the proposed technology has been proven. To intensify the heavy metal removal process while reducing the aeration time after coagulant injection, it is recommended to filter repeatedly the clarified water through a zeolite bed.Purpose: to test the physicochemical and sorption treatment of drainage and wastewater from a rice irrigation system.
Materials and methods. The process simulation which involved sequential treatment of water with aluminum oxychloride coagulant, aeration, and a single filtration through clinoptilolite was performed. To determine the effect of aeration duration on the amount of sediment formed, two experiments were conducted: after adding the coagulant, the forced aeration was performed for 5 and 30 minutes, with the air flow rate in both cases being 10 % of the water flow rate.
Results and discussion. The experiments proved that the sediment weight after five minutes of water aeration and settling for 1.5 hours is 0.365 g per 1 liter of treated water, and it is 0.36 g after thirty minutes of aeration and subsequent settling. After five minutes of aeration and settling, the iron content in treated water decreased by 81 %, manganese by 97 %, and nickel by 20 %. With single filtration through clinoptilolite, the iron concentration decreased by 41 % compared to the previous stage of purification, manganese by 50 %, copper by 33 %, lead by 72 %, zinc by 33 %, nickel by 41.5 %, and cadmium by 31.25 %. After 30 minutes of aeration and settling, the concentrations of the above-mentioned metals decreased by 88, 97, and 20 %, respectively, as well as cadmium by 19 %, requiring repeated zeolite filtration.
Conclusions. The effectiveness of physicochemical and sorption purification of drainage and wastewater from a rice irrigation system using the proposed technology has been proven. To intensify the heavy metal removal process while reducing the aeration time after coagulant injection, it is recommended to filter repeatedly the clarified water through a zeolite bed.
drainage and wastewater, rice irrigation system, treatment technology, coagulation, aeration, heavy metals
Milchenkova D. V., Drovovozova T. I., Pyatnitsyna E. V. Test results of physical-chemical and sorption purification of drainage and wastewater of a rice irrigation system. Ways of Increasing the Efficiency of Irrigated Agriculture. 2026;99(2):96–110. (In Russ.).
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