期刊论文

Control of the microcrystal formation during high-hardness water softening with Fe_3O_4 induced-crystallization

Nie, X.

中文

环境工程学报

1673-9108

2021

15

2

563-571

10.12030/j.cjee.202005020

国家自然科学基金资助项目（51408068）； 湖南省教育厅科学研究重点项目（18A122）； 湖南省重点研发项目（2019SK2191）；

本校为第一机构

为降低高硬水软化过程中微晶产率和改善结晶产物的分离性能,采用Fe3O4作为诱导结晶体系晶种,通过改变晶种投加量,考察了诱导结晶对结晶体系微晶的控制效果,并探讨了微晶产率与结晶体系上清液浊度的关系,以及诱导结晶体系出水混凝除浊效果。结果表明:诱导结晶和均相结晶产物晶型均为方解石,诱导结晶体系中晶种的引入可起到抑制均相结晶、降低微晶产率的效果,但均相结晶仍不可避免,提高Fe3O4投加量有助于微晶产率的降低;结晶体系中上清液浊度与微晶产率呈线性正相关关系,当Fe3O4投加量由0 g·L-1提高到10 g·L-1时,微晶产率由32.3%降至9.0%,钙去除率由35.6%提高至51.7%,相应上清液浊度由215.9 NTU...

In order to reduce the formation ratio of microcrystal and improve the separation performance of crystallization products during the high-hardness water softening process, Fe3O4 was used as the seed of induced-crystallization system. Through changing the dosage of Fe3O4, the control effect of induced-crystallization on microcrystal was examined, the correlation between the formation rate of microcrystal and the turbidity of supernatant was investigated and the turbidity removal efficiency of PAC coagulation on effluent was also analyzed. The re...