环境工程学报2024，Vol.18Issue(10)：2785-2794,10.DOI:10.12030/j.cjee.202311022
预氧化对聚铝混凝去除拉氏尖头藻水华的影响
Effects of pre-oxidation on the removal of Raphidiopsis raciborskii by coagulation with polyaluminum chloride
摘要
Abstract
Toxic and harmful cyanobacteria blooms with Raphidiopsis raciborskii as the dominant species have erupted frequently in lakes and reservoirs in Southern China,seriously affecting local ecological health and water safety.In this investigation,hydrogen peroxide(H2O2)and sodium hypochlorite(NaClO)were used to study the treatment effect of preoxidation coagulation technology on the disposal of algal water of Raphidiopsis raciborskii.By measuring the length,surface potential,activity and dissolved organic matter of algal filament,the reason why preoxidation promotes coagulation effect is analyzed.The results showed that an escalation in the dosage of oxidants or coagulants correspondingly heightens the removal efficiency of Raphidiopsis raciborskii.Specifically,doses of 0.6 mg·L-1 H2O2 or 1.2 mg·L-1 NaClO reduced the polyaluminum chloride(PACl)dosage from 25 mg·L-1 to 15 mg·L-1,achieving a removal efficiency surpassing 80％.Post oxidation treatment,Fv/Fm of algal cells plummeted from 0.39 to below 0.07,and esterase activity was not observed by fluorescence microscopy,indicating that algal cells were deactivated and membrane permeability increased.H2O2 elevated the Zeta potential of algal water from-14 mV to-10 mV,facilitating the electrostatic neutralization of PAC1 on algal cells,while NaClO exhibited negligible impact on the Zeta potential.Both H2O2 and NaClO augmented the dissolved organic matter(DOM)concentration in algal water from 5.95 mg·L-1 to 7.01 mg·L-1 and 6.68 mg·L-1,respectively.However,the content of strongly negatively charged protein and humic substance components exhibited a notable decrease with H2O2 or NaClO treatment,resulting in a 13.7％or 7.1％enhancement in algal cell removal efficiency.This implies that preoxidation treatment can enhance coagulation effectiveness by influencing DOM characteristics.The outcomes of this study furnish data support and a theoretical foundation for the effectiveness and safety of oxidation coagulation in the treatment of Raphidiopsis raciborskii,underscoring its potential utility in the in-situ emergency disposal of Raphidiopsis raciborskii blooms.关键词
拉氏尖头藻/水华/预氧化/混凝/溶解性有机物Key words
Raphidiopsis raciborskii/blooming/preoxidation/coagulation/dissolved organic matters分类
资源环境引用本文复制引用
耿征颜,蔡启佳,赵瑞,徐丽,梁荣昌,姚玲爱,马千里,苟婷,冯雁辉,孙瑞欣,杨裕茵..预氧化对聚铝混凝去除拉氏尖头藻水华的影响[J].环境工程学报,2024,18(10):2785-2794,10.基金项目
中央级公益性科研院所基本科研业务专项所自立资助项目(PM-zx703-202204-075) （PM-zx703-202204-075）
国家自然科学基金青年科学基金资助项目(42007295) （42007295）
