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钾、钠离子对垃圾渗滤液RO浓缩液中鸟粪石结晶的影响
The effect of potassium and sodium ions on the crystallization of struvite in RO concentrate of landfill leachate
投稿时间:2018-11-01  
中文关键词:垃圾渗滤液  RO浓缩液  钾钠离子  氨氮  鸟粪石
英文关键词:landfill leachate  RO concentrate  potassium and sodium ions  ammonia nitrogen  struvite
基金项目:国家自然科学基金资助项目(41772035)
作者单位E-mail
陶琼 合肥工业大学 资源与环境工程学院, 纳米矿物与环境材料实验室, 安徽 合肥 230009  
陈天虎 合肥工业大学 资源与环境工程学院, 纳米矿物与环境材料实验室, 安徽 合肥 230009 chentianhu@hfut.edu.cn 
刘海波 合肥工业大学 资源与环境工程学院, 纳米矿物与环境材料实验室, 安徽 合肥 230009  
朱守成 污水净化与生态修复材料安徽省重点实验室, 安徽 合肥 230009  
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中文摘要:
      垃圾渗滤液RO浓缩液等高氨氮废水中钾钠离子浓度较高,而钾钠离子对鸟粪石结晶法回收氨的影响规律尚未了解。本文通过向人工配制不同钾钠浓度的模拟和实际RO浓缩液中投加镁盐、磷酸盐促使鸟粪石结晶,测定结晶前后溶液中氨氮、磷酸盐、钾钠离子浓度,并利用XRD、SEM分析结晶产物的结构和形貌,探讨钾钠离子对鸟粪石结晶及氨回收率的影响。结果表明,随着K+浓度增加,氨氮回收率由96.5%降至83.0%,结晶产物中K+质量分数由2.4%升至6.4%;鸟粪石特征衍射峰向高角度偏移,说明K+进入鸟粪石晶格位置形成含钾鸟粪石;由于K+与NH4+存在竞争,在相同镁、氨氮、磷配比条件下会降低氨的回收率,但K+对鸟粪石粒径和形貌基本无影响。Na+对氨氮回收率影响不显著,但会影响鸟粪石晶体形貌。用实际垃圾渗滤液RO浓缩液实验表明,在鸟粪石结晶回收氨氮的水处理中考虑到K+的竞争,提高镁盐、氨氮与磷酸盐的投加比例为1.8:1:1.5即可保证氨氮的回收率,同时还可部分回收其中的K+成为缓释肥营养组分。
英文摘要:
      The high ammonia nitrogen wastewater in the landfill leachate RO concentrate contains high potassium and sodium ions, but the effect of potassium and sodium ions on the crystallization of struvite remains unknown. In this paper, the addition of magnesium salts and phosphates to the simulation of different potassium and sodium concentrations and the actual RO concentrate promotes the crystallization of struvite. The concentrations of ammonia nitrogen, phosphate, potassium and sodium ions in the solution before and after crystallization were determined. The structure and morphology of the crystallized products were analyzed by XRD and SEM. The effects of potassium and sodium ions on the crystallization and ammonia recovery of struvite were discussed. The results showed that, with the increase of potassium ion concentration, the ammonia nitrogen removal rate decreased from 96.5% to 83.0%, and the mass percentage of potassium ions in the precipitated product gradually increased from 2.4% to 6.4%. The characteristic peak of struvite is shifted to a high angle, indicating that potassium ions enter the lattice position of struvite and form a K-struvite; due to the competition between potassium ions and ammonium ions, the removal rate of ammonia nitrogen is reduced under the same magnesium, ammonia nitrogen and phosphorus ratio conditions. However, potassium ions have little effect on the crystal size and morphology of struvite. Sodium ion has no significant effect on ammonia nitrogen recovery, but it will affect the crystal morphology of struvite. Experiments with the actual landfill leachate RO concentrate show that the competition of potassium ions is considered in the water treatment of the recovery of ammonia nitrogen from struvite crystals, and the ratio of magnesium salt, ammonia nitrogen and phosphate is increased by 1.8:1:1.5. The recovery rate of ammonia nitrogen is ensured and, at the same time, the potassium ion is partially recovered as a nutrient component of the slow-release fertilizer.
陶琼,陈天虎,刘海波,朱守成,2019,钾、钠离子对垃圾渗滤液RO浓缩液中鸟粪石结晶的影响[J].岩石矿物学杂志,38(3):417~423.
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