介质阻挡放电强化沸石处理氨氮废水
Removal of aqueous ammonia nitrogen with permutite ehanced by dielectric barrier discharge
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摘要: 本文采用介质阻挡放电（DBD）强化沸石处理废水中的氨氮，比较了人造沸石、4A沸石分子筛、13X沸石分子筛等3种沸石对氨氮的去除效果，去除率分别为84.84%、17.54%、16.65%.DBD强化人造沸石对氨氮废水去除效果最佳，两者表现出了良好的协同去除氨氮作用.采用单因素实验和正交实验考察了放电电压、放电间距、放电频率等电气参数对氨氮处理的影响.研究结果表明，最佳实验参数为：放电间距0 mm，放电电压22 kV，放电频率14.5 kHz，20-40目人造沸石投加量10 g·L-1，处理20 min，初始浓度100 mg·L-1的模拟氨氮废水去除率达84.84%.在协同体系中，DBD产生的高压电场、热效应加速了离子的迁移，冲击波和超声等增加了分子、离子与沸石颗粒的碰撞几率.氨氮克服沸石表面界膜阻力的能力增加，促使沸石表面吸附的氨氮向沸石内部迁移，氨氮更易被去除.Abstract: In this study, enhanced removal of aqueous ammonia nitrogen with zeolite by dielectric barrier discharge (DBD) were investigated. Three types of synthetic zeolites, permutite, molecular sieves type 4A, and molecular sieves type 13X were compared for ammonia nitrogen removal. The removal rates were 84.84%, 17.54% and 16.65%, respectively. Permutite showed the best synergistic effect with DBD on ammonia nitrogen removal. The effects of electrical parameters such as peak voltage, discharge distance, and discharge frequency were evaluated by single factor experiment and orthogonal experiment. The results showed that the optimum electrical parameters were discharge distance 0 mm, peak voltage 22 kV, discharge frequency 14.5 kHz when the ammonia nitrogen concentration was 100 mg·L-1 and 20-40 mesh permutite dosage was 10 g·L-1. The removal rate was 84.84% after 20 min treatment. In the synergistic system, the high-voltage electric field and thermal effects generated by DBD accelerated the migration of the ions in the water. The blast and ultrasound generated by DBD increased the collision between molecules, ions and permutite. The ability of ammonia nitrogen overcoming the resistance of permutite surface boundary increased and then promoted its migration from the surface into the inside of permutite. Therefore, ammonia nitrogen was more easily removed.
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Key words:
- ammonia nitrogen wastewater /
- permutite /
- dielectric barrier discharge /
- synergistic
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