水解产物晶型转变对铁盐混凝除藻的影响

方鑫; 万俊力; 聂小保; 涂栾林; 孙士权; 赵宇新

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中国环境科学 ›› 2026, Vol. 46 ›› Issue (1) : 152-160.

水污染与控制

水解产物晶型转变对铁盐混凝除藻的影响

方鑫¹, 万俊力^1,2, 聂小保^1,2, 涂栾林¹, 孙士权^1,2, 赵宇新³

作者信息 +

Effect of crystal transformation of hydrolysis products on coagulation performance of iron salt for algae removal

FANG Xin¹, WAN Jun-li^1,2, NIE Xiao-bao^1,2, TU Luan-lin¹, SUN Shi-quan^1,2, ZHAO Yu-xin³

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摘要

蓝藻暴发会危及饮水安全,混凝是自来水厂的关键除藻技术,铁盐为最常用的混凝剂之一.为进一步探明铁盐除藻机制,以铜绿微囊藻及藻源有机物为处理对象,考察水解产物晶型转变对除藻效果和混凝过程的影响.结果表明,水解产物发生晶态、晶相及晶型转变主要受混凝剂投加量和pH值影响,随着投加量和pH值上升,主要水解产物FeO(OH)被无定形Fe(OH)₃(PDF#22-0346)替代,随后转化为Fe₃O₄,最终向准晶态Fe(OH)₃(PDF#38-0032)转变.水解产物的晶态和晶型变化会影响藻絮体表面特性,投加量为0.7mmolFe/L时的藻絮体S_BET和V_t值最大,有利于吸附藻源有机物而处理效果最优.在0.1~0.5mmolFe/L投加范围内,主要水解产物的晶型转变对除藻效果、藻絮体粒径及其增长速率的影响更为显著.

Abstract

Outbreak of blue-green algae posesa threat todrinking water safety. Coagulation is a key technology for algae removal in waterworks, andiron salt is one of the most commonly used coagulants. To further explore the mechanism of iron salt for removing algae, Microcystis aeruginosa and algal organic matters were selected as the target pollutants. The effect of crystal transformation of the main hydrolysis products on removal efficiency and coagulation process was investigated. The results indicated thatthe transformationof crystalline state, crystalline phase, and crystal form of hydrolysis products were mainly affected by the coagulant dosage and pH value. With the increase of dosage and pH, the main hydrolysis product FeO(OH) was replaced by amorphous Fe(OH)₃(PDF#22-0346), and then converted to Fe₃O₄. Amorphous Fe(OH)₃ finally transformed into quasicrystalFe (OH)₃(PDF#38-0032). The surface characteristics of algal flocs were affected by the crystalline state and crystal form change of hydrolysis products. The maximum S_BET and V_t values of algal flocs were observed at a dosage of 0.7mmolFe/L, which werebeneficial to adsorb algal organic matters andresulted in the optimal treatment efficiency. Within the range of 0.1~0.5mmolFe/L, the crystal transformation of the main hydrolysis products had a more significant effect on algae removal efficiency, particle size and growth rate of algal flocs.

导出引用

方鑫, 万俊力, 聂小保, 涂栾林, 孙士权, 赵宇新. 水解产物晶型转变对铁盐混凝除藻的影响[J]. 中国环境科学. 2026, 46(1): 152-160

FANG Xin, WAN Jun-li, NIE Xiao-bao, TU Luan-lin, SUN Shi-quan, ZHAO Yu-xin. Effect of crystal transformation of hydrolysis products on coagulation performance of iron salt for algae removal[J]. China Environmental Science. 2026, 46(1): 152-160

中图分类号： X703.1

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