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Removal of Colloidal Particles by using Gelation Reaction of Sodium Alginate

海藻酸钠凝胶化反应去除胶体颗粒

基本信息

批准号：
10650765
负责人：
IWATA Masashi
金额：
$ 1.73万
依托单位：
Suzuka National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650765/
关键词：
sodium alginate gel colloid difficult to filter mud water shielding technique expression ion exchange carboxy methyl cellulose 圧密係数

项目摘要

A novel technique utilizing the gelation reaction of natural polymers has been proposed for the separation of solid from liquid in difficult-to-filter colloidal suspensions. This technique is especially effective in the treatment of colloidal muddy water of high solid concentration, which is often produced as a byproduct of certain construction processes. Colloidal suspensions are mixed with a sodium alginate solution, and this mixture is added to a calcium chloride solution, resulting in the entrapping of colloidal particles by the calcium alginate gel. Gel suspensions are then drained gravitationally, followed by mechanical expression of gel particles. Fundamental aspects of this process are investigated using sodium bentonite as an experimental material. The alginate-bentonite mixture is added dropwise to the calcium solution. Decreasing the droplet size of the mixture expedites gelation since the diffusion of calcium ions into droplets determines the rate of gelation reactions. Reducing the alginate content expedites expression of the gel since alginate content is inversely proportional to the rate of expression. Carboxy methyl cellulose (CMC) as a stabilizer of bentonite mud water does not affect the gelation reaction, while the expression rate of the gel decreases with the increase in CMC content in the gel. This is due to the water retention capacity of CMC.

已经提出了一种利用天然聚合物凝胶反应的新技术，用于在难以过滤的胶体悬浮液中分离固体和液体。该技术对于处理高固体浓度的胶体泥水特别有效，这种泥水通常是某些施工过程的副产品。将胶体悬浮液与海藻酸钠溶液混合，并将该混合物添加到氯化钙溶液中，导致海藻酸钙凝胶捕获胶体颗粒。然后通过重力排出凝胶悬浮液，然后对凝胶颗粒进行机械挤压。使用钠膨润土作为实验材料研究了该过程的基本方面。将藻酸盐-膨润土混合物滴加到钙溶液中。减小混合物的液滴尺寸会加速凝胶化，因为钙离子扩散到液滴中决定了凝胶化反应的速率。减少藻酸盐含量可加速凝胶的表达，因为藻酸盐含量与表达速率成反比。羧甲基纤维素（CMC）作为膨润土泥水的稳定剂，不影响凝胶化反应，而凝胶的表达率随着凝胶中CMC含量的增加而降低。这是由于CMC的保水能力。