%0 Journal Article
%T 火电厂高镁硬度脱硫废水预处理技术研究<br>Research on Pretreatment Technology of High Magnesium Hardness Desulfurization Wastewater from Thermal Power Plants
%A 李飞
%A 朱利明
%A 刘海洋
%A 杨春平
%A 武旭升
%A 白玉勇
%A 荆亚超
%A 胡浩
%A 王慧卿
%J International Journal of Ecology
%P 290-297
%@ 2324-7975
%D 2024
%I Hans Publishing
%R 10.12677/ije.2024.132038
%X 以高镁硬度脱硫废水为研究对象，分析了药剂和反应条件等因素对其中Ca<sup>2 </sup>和Mg<sup>2 </sup>去除效果的影响。结果表明：当草酸钠添加量为n (C2O42-):n (Ca<sup>2 </sup>) = 1.4:1，pH为4，陈化时间为8 h，草酸钙晶种添加量为0.35%时，Ca<sup>2 </sup>的去除率高达91.2%，Mg<sup>2 </sup>的去除率仅为2.5%。本方法可在基本不影响Mg<sup>2 </sup>含量的同时，实现对Ca<sup>2 </sup>的选择性去除。以本实验采用的废水为例，相对于常规双碱软化法，本方法可降低86.7%的沉淀量，降低93.4%的软化剂投加量，减少80.3%的软化剂成本，具有显著的技术和经济优势。<br />
This study focused on the preferential softening of Ca<sup>2 </sup> in high magnesium desulfurization wastewater. Effects of softener and reaction conditions on the removal of Ca<sup>2 </sup> and Mg<sup>2 </sup> were investigated. When sodium oxalate was added as n (C2O42-):n (Ca<sup>2 </sup>) = 1.4:1, pH was 4, aging time was 8h, and calcium oxalate (seed crystal) was added as 0.35%, the removal rate of Ca<sup>2 </sup> could reach up to 91.2%, while the removal rate of Mg<sup>2 </sup> was merely 2.5%. The content of Ca<sup>2 </sup> can be removed preferentially, with little Mg<sup>2 </sup> being removed. In comparison with the common NaOH-Na<sub>2</sub>CO<sub>3</sub> softening process, the precipitation quantity, dosage of softener and cost of softener can be reduced by 86.7%, 93.4%, and 80.3%, respectively. The softening method proposed by this study has significant technological and economic advantages.
%K 高盐废水，高镁硬度，钙硬度，预处理<br>High Salt Wastewater
%K High Magnesium Hardness
%K Calcium Hardness
%K Pretreatment
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=88230