ZHANGYa-li,LIUYan,GAOYi.Application of Reverse Osmosis in Nitrate Control of Water Supply Plant[J].China Water & Wastewater,2023,39(18):90-94.
Application of Reverse Osmosis in Nitrate Control of Water Supply Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第18期
Page:
90-94
Column:
Date of publication:
2023-09-17
- Keywords:
- water supply; nitrate; sulfate; ultrafiltration; reverse osmosis
- Abstract:
- High concentration of nitrate and sulfate is detected in raw water of a water supply plant in Yantai. The nitrate and sulfate concentration in raw water is 13.54 mg/L and 315 mg/L respectively in wet weather, which can not be effectively controlled by conventional coagulation, sedimentation and filtration process. These two items are main desalting objectives for the advanced treatment process. The effluent from the sand filter is treated by reverse osmosis to produce desalinated water with volume of 7.20×104 m3/d, which is mixed with the effluent from the conventional treatment process with volume of 9.04×104 m3/d, and the production target of water supply with capacity of 16.24×104 m3/d is eventually achieved. The nitrate removal efficiencies of reverse osmosis is not less than 80%, respectively. The ultrafiltration pretreatment ensures that the SDI is less than 3. The recovery rate of the fresh water RO unit is greater than 80%, the recovery rate of the concentrated water RO unit is greater than 50%, and the total recovery rate of the system is greater than 90%. The indicators of the effluent from the advanced treatment process are better than the design values.
Last Update:
2023-09-17