摘要：采用热解回收的方法可以有效降低磷酸铵镁（MAP）法去除渗滤液氨氮的成本，热解产物的晶体形态变化对氨氮去除率有着显著的影响。磷酸铵镁多次热解复活后的氨氮去除率表明，新鲜渗滤液中磷酸铵镁的热解复活效率远低于老龄渗滤液。利用XRD（X射线衍射仪）、TGA（热重分析仪）和SEM（扫描电子显微镜）分析了不同热解温度、回用次数和渗滤液种类下的磷酸铵镁晶体形态变化过程，揭示了磷酸铵镁热解回收去除渗滤液氨氮机制以及渗滤液对磷酸铵镁热解复活的抑制作用。磷酸铵镁在100oC碱性环境下脱水释氨形成磷酸氢镁和磷酸钠镁等无定形磷酸镁盐以再次吸附氨氮形成磷酸铵镁晶体。新鲜渗滤液中高浓度的有机物和钙离子产生了结晶竞争、裹挟和晶格掺杂等抑制作用造成了磷酸铵镁及其热解产物的失活。
关键词：磷酸铵镁，热解，晶体形态
Abstract:
The ammonia removal cost significantly
decrease through the application of magnesium ammonia phosphate (MAP) pyrolysis
and reuse. The ammonia removal rate depends on the crystal morphology of the
MAP and its pyrolysis products. The pyrolysis efficiency and ammonia removal
rate in fresh leachate is far below the one in mature leachate. The crystal
morphology changes of MAP in different temperature, recycle times and leachate
type are researched by XRD (X-ray Diffraction), TGA (Thermo Gravimetric
Analyzer) and SEM (Scanning Electron Microscope). The mechanism of MAP pyrolysis
and ammonia removal are investigated considering the inhibition of different
leachate. At 100oC, MAP lose crystal waster and release ammonia in
alkaline environment and forms amorphous magnesium salt and phosphate, which
could absorb ammonia ions to crystalize again. High level of organic compounds
and calcium ions in young leachate result in competitive inhibition, inclusion
and lattice replacement leading to the inactivation of MAP and its pyrolysis
products.
Key
Words: Magnesium Ammonia Phosphate (MAP), Pyrolysis,
Crystal Morphology
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