改性沸石吸附柱去除氨氮的研究毕业论文.doc

改性沸石吸附柱去除氨氮的研究毕业论文.doc

  1. 1、本文档共55页,可阅读全部内容。
  2. 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
  3. 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  4. 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
摘 要 氨氮是引起水体富营养化和环境污染的重要物质,采用沸石去除水中氨氮是水污染控制领域的研究热点之一。沸石是一种廉价的非金属矿物,具有独特的吸附和离子交换性能。天然沸石在改性过程中, 硅的质量分数显著减少,而钠的质量分数增多. 这样有利于NH4+-N的交换反应,因此改性沸石对氨氮的吸附NH4+-N的性能加强。 本研究首先对天然沸石进行了改性,确定了最佳的改性条件,并通过采用动态法研究改性沸石吸附柱去除微污染水源中氨氮的规律,包括改性沸石的粒径大小、入水流速、初始氨浓度等参数的影响,绘制穿透曲线。通过研究,本文得出了以下结论:①沸石改性的最佳条件为:NaCl溶液浓度3mol/L,水浴温度70~75℃,时间3h;②NaCl改性沸石的去除率明显高于未改性的。相比之下对氨氮的去除率增加了8%;③沸石粒径越小,去除率越高,改性效果越好。沸石粒径在0.5-1mm是对氨氮的去除率最高;④入水流速越小,改性沸石对氨氮的去除率越高;⑤废水的初始浓度越低,改性沸石对氨氮的去除率越高。最高可到达74%. 关键词:改性沸石 氯化钠 氨氮 吸附 Abstract Ammonia-nitrogen(NH4+)is an important contaminant for eutrophication of water bodies and environmental pollution. Zeolite is a cheap non-metallic minerals,with unique adsorption and ion -exchange performance。 After natural zeolite is modified quality score of silicon significantly reduces,And quality score of Sodium increases。It helps in ammonium-ion exchange, so dsorption performance of modified zeolite strengthens。 At first the natural zeolite was modified by chemical approaches in the research,and choose the best modifying condition of zeolite.Then study its treatment effect of low concentration NH4+in column reactor and draw breakthrough curve, investigating such factors as pellet size, velocity of flow and nitial ammonia concentration etc. The main results of this research were as follows:ⅠUnder these circumstances:,c=3mol/l,T=70~75℃,the modification time3hours,we can get the the right modified zeolite; Ⅱ removal efficiency of zeolite modified with for ammonia nitrogen is significantly higher than unmodified 。In contrast to ,removal rate of ammonia nitrogen increases by 8%;ⅢThe smaller the modified zeolite particle size, the higher the modification ;Ⅴthe water velocity is smaller, removal of ammonia nitrogen is higher;Ⅳwastewater concentration is lower, the modified zeolite of removal rate of ammonia nitrogen is higher . The highest removal rate can reach 74 percent Key words:modified zeolite NaCl ammonia nitroge wastewater

文档评论(0)

seunk + 关注
实名认证
内容提供者

该用户很懒,什么也没介绍

1亿VIP精品文档

相关文档