文档介绍：硕士学位论文
非金属矿物去除污水中氮磷的研究
摘要
随着工业化程度不断加深,环境污染问题也越来越严重,水污染问题受到人们所重视,净化处理受污染的水质成为当前的热门课题。传统的污水净化处理成本过高,综合治理效果也不是很明显。本课题针对上述问题,利用天然粘土矿物累托石的吸附性能,储量多、价格便宜的特点,旨在为预防和修复水体富营养化开辟一条新的处理途径。具体来讲,本论文主要有以下两方面的内容。
本文首先对天然非金属矿物(累托石、高岭土、伊利石、硅藻土、膨润土、海泡石、沸石(8~20目)、沸石(2~4mm))吸附氮磷的吸附性能进行对比试验。实验结果表明,天然粘土矿物对水体中氮磷虽然有一定去除作用,但效率不高。
其次,本文重点讨论了天然累托石的改性及改性累托石对氮磷的吸附性能,并对混合改性累托石吸附氮磷的影响因素进行了控制单因子变量研究。实验结果表明:经高温煅烧后的累托石,其比表面和层间距均显增大,经700℃煅烧过的累托石对氮磷的吸附性能最好;酸改性、碱改性、无机盐改性和有机改性可分别对累托石的结构及理化性质进行微调,改性累托石对模拟水样中氮磷的吸附性能均有所提高,但由于各种因素的相互制约,单因子改性累托石对模拟水样中氮磷吸附容量均出现阀值;通过对累托石的混合改性,其对模拟水样中氮磷的吸附性能均大大提高,其中等摩尔比混合改性的累托石对模拟水样中氮磷的吸附性能最好,N、/g,%%。
体系初始pH、吸附温度、吸附时间等对等摩尔比混合改性累托石氮磷的吸附容量有较大影响。等摩尔比混合改性累托石在酸强度较小的范围内其氮磷吸附容量达到最大;当吸附温度达35℃时,氮磷吸附速率最大, ,较高温度均有利于改性累托石对水样中氮磷的吸附;当吸附时间达到130min时,改性累托石对氮磷的吸附均达到饱和。
关键词:累托石,氮吸附,磷吸附,改性,水环境修复
NON-METALLIC MINERAL REMOVAL OF NITROGEN AND PHOSPHORUS IN SEWAGE
Author: Yin Zhiwei Instructor: Liu Hengsheng
ABSTRACT
At present, with the development of China's industry, more and more serious problems of environmental problems, such as water pollution, attracting more and more peoples’ attention. The study of purification of contaminated water has e hot topic. However, traditional eutrophication water treatment costs high and ineffective. Focus on solve these problems, in this paper, natural clay of rectorite was used as excellent materials to adsorption N and P.
Firstly, the natural non-metallic mineral were used, such as rectorite kaolinite, illite, diatomite, bentonite, sepiolite, zeolite (8 to 20 mesh), zeolite (2 ~ 4mm) ., there nitrogen and phosphorus adsorption performance were test. The experimental results show that the natural clay minerals can adsorption N, P, but the efficiency is low.
Secondly, the article focuses on the natural rectorite modified and modified rectorite adsorption properties, moreover, the mixed modified rectorite adsorption nitrogen, phosphorus influencing factor