高浓度氨氮废水中氨氮的去除
coupled plasma-atomic emission
spectrometry(ICP—AES),and
microscopy(SEM).For
the 1 00mL 1 000 mg‘L~NH4+-N solution, 5.0 g modified clinoptilolite is 77.8%.
obvious effect.
Key
Words:ammonia-nitrogen
wastewater,orthogonal experiment,Na—P zeolite,
magnesium hydrogen phosphate
lV
一———————————————————————————————————————————一
wastewater with Na2C03
as
used
to
dispose
ammonium-nitrogen
adjusting
agent.To wastewater with initial concentration
of NH4+1 000 mg‘L~.the ratio of elimination for NH4+-N by 2.5 g
摘要
环使用性能,同时大大降低了处理成本。 三、在改性沸石及化学法研究去除氨氮废水的基础上,以高浓度氨氮模拟 废水为处理对象,研究了两者组合工艺去除氨氮的效果,氨氮去除效果明显。 关键词:氨氮废水,正交试验,Na.P型分子筛,磷酸氢镁
Abstract
With
ammonia the development of industry technology,the emssion problem of
are
heating under 1 00℃in 3 h wastewater.high
repeatedly used to dispose ammonium-nitrogen
efficient
circulate and cost reduction is realized.
3.On the basis of the modified zeolite
an
health and aquatic organisms.It also leads to the increasingly serious risk to human mass multiplication of algae and eutrophication in water system.Therefore,it is very important
.nitrogen wastewater becomes more and more serious.High—concentration NH4+-N of wastewater turned into nitrate nitrogen and nitrite nitrogen has imposed
hydrothermal
reaction.The
adsorption
capacity
of
modified
clinoptilolite for ammonia—nitrogen was measured.The modification processes of clinoptilolite were optimized through orthogonal experiment with 5x6 factors.It is found that the temperature of hydrothermal treatment was the most significant impact
In this paper,the formation and harm of the concentrated NH4+-N wastewater were discussed firstly.Then current methods were used to deal with the pollution of
(ICP.AES)和扫描电镜(SEM)对改性前后的沸石进行了表征。结果表明:用
碱熔法处理的沸石转变为低硅铝比的Na.P型分子筛,它对氨氮废水中NH4+-N 的去除效果要比天然斜发沸石好,且是个快速吸附平衡过程。当改性沸石投加
量为5 g,对100 mL浓度为1000 mg・Lo氨氮溶液,氨氮去除率可达77.8%,改
ammonia—nitrogen,and the methods
were
advantages related
and
disadvantages of different treatment
clinoptilolite wastewater.
detailedly
and
reviewed.Modified ammonia-nitrogen
第一章绪论
第一章绪论
第一节氨氮废水综述
我国水资源比较短缺,人均水资源占有量为2400.2500 m3,仅为世界人均 占有量的1/4,排在世界的第110位[1】。同时水污染情况也异常严重,七大水系 近一半河段污染严重,80%的河流都遭受不同程度的污染,主要湖泊的水质下 降[21,这使我国缺水形势更为严峻。目前,水资源污染问题已经成为我国社会、 经济长稳发展的瓶颈。而氨氮在废水污染物中占很大的比例,2010年我国废水 中氨氮污染物的排放量高达120.3万吨[31。『F是废水中氨氮排放数量大、来源较 广泛,对环境危害大,氨氮废水的排放控制标准也更加严格。因此对水体中氨 氮去除的研究有至关重要的意义。
for the property of
modified
clinoptilolite
in
the
removal
of
ammonia—nitrogen.In the modification processes the Na-P zeolite with lower Si/A1 molar ratio Primary
and
the chemical method to remove process shows is
an
ammonia-nitrogen
in
concentrated
NH4+-N
wastewater,combined
the result
researched to remove ammonium-nitrogen wastewater,and
性沸石吸附NH4+-N的过程较好的符合Langmuir吸附等温模式,偏向于单分子 层的吸附过程。文章还对改性沸石的再生问题及其对金属离子cu2+的吸附作了 初步研究。 二、通过磷酸盐复分解法制备磷酸氢镁,然后探讨了以磷酸氢镁(MHP) 为吸附剂,Na2C03为pH调节剂来处理高浓度氨氮废水的过程。结果表明:对
a
isothermal
adsorption model,and it
monomolecular layer adsorption.
hydrogen it
2.Magnesium
phosphate(MHP)is
is
prepared the
by
double
decomposition method.Then
MHP
is 92.5%.
Moreover,The
analysis with XRD,TG-DTA is researched
on
the decomposition of
the magnesium ammonium
phosphate(MAP).The residues of MAP decomposed by
and
MgHP04‘3H20
have been studied to deal with
as
The main work in the thesis iS
follows:
1.The Chinese natural clinoptilolite was modified through fusing with sodium hydroxide and
to
remove ammonia.nitrogen in wastewater.Due
to
increasingly stringent
control of NH4+一N wastewater,processing attracting more attention.
of ammonia-nitrogen wastewater is
南开大学 硕士学位论文 高浓度氨氮废水中氨氮的去除 姓名:丁真贞 申请学位级别:硕士 专业:无机化学 指导教师:黄唯平 2012-05
摘要
随着工业的发展,氨氮废水的排放量同趋增多。在过高浓度氨氮废水中, 氨氮可被微生物转化为毒害较大的硝态氮,亚硝态氮等,对人体及水中生物产 生一定的毒害作用,同时造成水中微生物及藻类的大量繁殖,形成水体富营养 化污染,因此对水体中氨氮的去除有至关重要的实际意义。现在由于氨氮废水 的控制越来越严格,高浓度氨氮废水的处理研究日益引起关注。 文章通过参阅大量资料文献,在探讨高浓度氨氮废水的形成、分布及对人 体危害的基础上,分析比较了目前国内外使用的各种去除氨氮的方法,并对不 同处理方法的优缺点进行了对比。主要探讨了将天然沸石通过熔融一水热法改性 和以MgHP04"3H20为吸附剂的化学法去除氨氮的方法。 本论文主要研究以下几个方面: 一、采用氢氧化钠碱熔水热法处理缙云斜发沸石,并以其对氨氮废水进行 处理,采用正交实验研究了碱熔法处理斜发沸石过程中的各个影响因素,确定 了碱熔水热法改性沸石的最佳条件。试验表明:处理沸石的水热温度对氨氮去除 效果影响最显著。用粉末X射线衍射(XRD)、电感耦合等离子体发射光谱法