GAC-UF一体化净水柱去除水中硝酸盐氮的研究

Study on removal of nitrate nitrogen in water by GAC-UF integrated water column

在硝酸盐氮浓度5～25 mg/L,pH值在5. 5～8. 5,进水流量75～150 mL/min,颗粒活性炭厚度在100～150 mm的变化条件下,考察了GAC-UF一体化净水柱对水中硝酸盐氮去除的效果,以及活性炭和超滤的协同去除效果。结果表明,随着活性炭厚度、硝酸盐氮浓度的增大,硝酸盐氮的去除率增加;在流量75 mL/min时,pH值为5. 5和8时,硝酸盐氮去除率分别可达25. 21%,23. 01%。协同实验表明,超滤对硝酸盐氮的去除率仅为3. 97%,而活性炭的去除率为14. 55%,但一体化净水柱的去除率达到23. 01%,表明颗粒活性炭和超滤具有协同作用。该装置对硝酸盐氮浓度不超过饮用水标准1. 25倍的原水,经处理后,可达到饮用水标准。

The concentration of nitrate nitrogen was 5 ~ 25 mg/L,the p H value was 5. 5 ~ 8. 5,the influent flow was 75 ~ 150 m L/min,and the granular activated carbon thickness under the 100 ~ 150 mm variation,the effect of the integrated water column on the removal of nitrate nitrogen in water and the synergistic removal effect of activated carbon and ultrafiltration was examined. Results provided nitrate removal rate increases with the activated carbon thickness,nitrate nitrogen concentration increases. Nitrate nitrogen removal rate of up to 25. 21%,23. 01% at pH 5. 5 and 8,the flow rate of 75 m L/min. Synergetic experiments showed that the removal rate of nitrate nitrogen by ultrafiltration was only 3. 97%,while the removal rate of activated carbon was 14. 55%,but the removal rate of the integrated water column reached23. 01%,indicating that the granular activated carbon and ultrafiltration had a synergistic effect. The device uses raw water whose concentration of nitrate nitrogen does not exceed 1. 25 times the standard of drinking water and can reach drinking water standards after treatment.