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电吸附除盐技术是一种新型的饮用水处理技术,具有能耗低、无二次污染和电极可重复利用等优点。采用活性炭纤维(ACF)作为电极材料对其电吸附去除水中的硝酸盐进行了研究,考察了电压、pH、流速、初始浓度等因素对电吸附效率的影响以及超声处理对电极脱附和再次利用的影响。结果表明,电吸附作用对硝酸盐的去除有较高的效率,最佳的工艺条件为:电压1.0 V,pH为5.0~6.0,进水流速10 m L·min~(-1),初始NO_3~--N浓度为25~30 mg·L~(-1),在该条件下硝酸盐去除效率为68.3%~72.62%。超声处理对电极的脱附作用和再生效率有较大的改善和提高,超声处理过的电极比未处理的电极对硝酸盐的去除率可提高16.10%~18.98%。
Electrosorption desalination technology is a new drinking water treatment technology, with low energy consumption, no secondary pollution and electrodes can be reused and so on. The activated carbon fiber (ACF) was used as the electrode material to remove the nitrate from the water. The effects of voltage, pH, flow rate and initial concentration on the efficiency of the electro-adsorption were investigated. The effects of ultrasonic treatment on the electrode desorption and reuse influences. The results showed that the electrosorption was efficient for the removal of nitrate. The optimum conditions were as follows: voltage 1.0 V, pH 5.0-6.0, inflow velocity 10 m L · min -1, initial NO 3 ~ - N was 25 ~ 30 mg · L -1, nitrate removal efficiency was 68.3% ~ 72.62% under this condition. The desorption and regeneration efficiencies of the electrode were greatly improved and enhanced by sonication, and the removal rate of nitrate by sonotrope increased by 16.10% ~ 18.98% compared with the untreated electrode.