Optimization of dredging residual water treatment by magnetic loading coagulation using response surface methodology

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Aug.2024, Vol.47 No.8: 1021-1027, 1034

DOI: 10.3969/j.issn.1003-5060.2024.08.003

Authors

ZHANG Yuming $ ^{1,2} $, HUANG Guoping $ ^{1} $, HAN Jiuchun $ ^{1} $, XIAO Yuanting $ ^{2} $, XU Deqian $ ^{2} $, FENG Jingwei $ ^{2} $

(1. Anhui Construction Engineering Traffic and Shipping Group Co., Ltd., Hefei 230022, China; 2. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In this paper, the dredging residual water in the dredging mud dumping area of the project to divert water from the Yangtze River to the Huaihe River is used to carry out experiments, exploring the treatment effect of nine kinds of coagulants on dredging residual water, optimizing the process conditions of magnetic loading coagulation treatment of dredging residual water by using response surface methodology, and analyzing the changes of colored dissolved organic matter and nitrogen and phosphorus concentrations during this process. The results of coagulant screening experiments show that aluminum sulfate is the best coagulant when the removal rate of suspended solids (SS) from dredging residual water is taken as the evaluation index. The response surface test results show that the aluminum sulfate dosage has the greatest effect on SS removal rate of dredging residual water, followed by stirring G value and magnetic powder dosage. The optimal process conditions under the experimental conditions are as follows: the magnetic powder is 260 mg/L, the aluminum sulfate is 40 mg/L, and the stirring G value is 80 s $ ^{-1} $. The colored dissolved organic matter in the dredging residual water is mainly fulvic acid and humic acid, which can be selectively removed by magnetic loading aluminum sulfate coagulation. Magnetic loading aluminum sulfate coagulation can achieve the standard discharge of SS, chemical oxygen demand (COD $ _{cr} $), ammonia nitrogen and total phosphorus in highly concentrated dredging residual water (SS mass concentration of 1 405 mg/L), and the addition of magnetic powder.

Keywords: dredging residual water; magnetic loading; coagulation; response surface; suspended solids(SS)

作者信息

张玉明 $ ^{1,2} $，黄国平 $ ^{1} $，韩久春 $ ^{1} $，肖源廷 $ ^{2} $，徐得潜 $ ^{2} $，冯景伟 $ ^{2} $

(1. 安徽建工交通航务集团有限公司, 安徽合肥 230022; 2. 合肥工业大学土木与水利工程学院, 安徽合肥 230009)

摘要和关键词

摘要: 文章采用引江济淮工程疏浚泥浆抛泥区中的疏浚余水展开实验, 探究9种混凝剂对疏浚余水的处理效果, 使用响应面法优化磁加载混凝处理疏浚余水的工艺条件, 分析该过程中有色溶解性有机物和氮磷质量浓度的变化规律。混凝剂筛选实验结果显示, 以疏浚余水悬浮物(suspended solids, SS)去除率为评价指标时优选混凝剂为硫酸铝。响应面实验结果表明: 硫酸铝投加量、搅拌G值、磁粉投加量对疏浚余水SS去除率的影响程度逐渐减弱, 实验条件下最优工艺条件为磁粉、硫酸铝的投加量分别为260、40 mg/L, 搅拌G值 $ 80\ s^{-1} $; 疏浚余水的有色溶解性有机物以黄腐酸类和腐殖酸类物质为主, 磁加载硫酸铝混凝对两类物质有较大幅度的选择性去除; 磁加载硫酸铝混凝可实现对高质量浓度疏浚余水(SS质量浓度1405 mg/L)的SS、Cr元素化学需氧量(chemical oxygen demand, COD $ _{cr} $)、氨氮、总磷达标排放, 磁粉的投加显著提高了混凝去除SS的效率。该研究可为疏浚余水高效处理工艺的开发和应用提供参考。

关键词: 疏浚余水；磁加载；混凝；响应面；悬浮物(SS)

Funding

安徽省交通运输行业重点科技资助项目（2021-KJQD-021）；引江济淮航运部分科研资助项目（2021-HY-07）

合肥工业大学学报(自然科学版)

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