紫外光联合二价铁活化次氯酸钠对污泥脱水影响及调理机制

蓝梅; 杨培森; 张慧龙; 孔嘉璐

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中国环境科学 ›› 2026, Vol. 46 ›› Issue (1) : 238-247.

固体废物

紫外光联合二价铁活化次氯酸钠对污泥脱水影响及调理机制

蓝梅, 杨培森, 张慧龙, 孔嘉璐

作者信息 +

Effects and conditioning mechanisms of sludge dewaterability by activating persulfate with a combination of ultraviolet light and ferrous iron

LAN Mei, YANG Pei-sen, ZHANG Hui-long, KONG Jia-lu

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文章历史 +

摘要

以NaClO作氧化剂,采用联合调理体系对污泥进行调理,考察调理前后污泥脱水性能的变化,验证紫外光对高级氧化体系的促进作用,同时对单独投加NaClO调理污泥时,出现脱水性能恶化的原因进行探讨.以毛细吸水时间(CST),污泥比阻(SRF)作为污泥脱水性能评价指标,考察药剂投加量比NaClO/FeSO₄,Fe²⁺投加量和pH值对污泥脱水性能的影响.结果表明紫外光可在Fe²⁺对次氯酸盐的活化基础上进一步活化出更高浓度的强氧化性自由基对EPS破解,添加UV照射后污泥CST降低率由61.5%提升至65.4%,污泥SRF降低率由71.4%提升至79.8%.实验过程中污泥TB-EPS向LB-EPS中转化,转化过程结束后,蛋白质物质的分解与氧化是污泥脱水性能提升的关键.分析发现单独投加NaClO时脱水恶化的原因是体系中氧化能力不足和投加NaClO调理污泥后产生的大量气泡.

Abstract

A combined conditioning system using NaClO as the oxidizing agent was employed to condition sludge. The variations in sludge dewatering performance before and after conditioning were investigated to validate the enhancing effect of ultraviolet irradiation on the advanced oxidation process. Meanwhile, the reasons for the deterioration in dewatering performance were discussed when NaClO was added alone. The effects of dosage ratios (NaClO/FeSO₄), Fe²⁺ dosage, and pH value on sludge dewatering performance were investigated using the capillary suction time (CST) and specific resistance to filtration (SRF) as key evaluation indicators. The results demonstrated that the ultraviolet irradiation activated a higher concentration of strong oxidative free radicals based on the activation of Fe²⁺ towards NaClO, thereby promoting the decomposition of EPS. With the addition of UV irradiation, the CST reduction rate increased from 61.5% to 65.4%, while the SRF reduction rate increased from 71.4% to 79.8%. During the experiment, the TB-EPS of the sludge were converted into the LB-EPS of the sludge. As a result of this conversion, the decomposition and oxidation of protein played a crucial role in enhancing sludge dewaterability. Analysis revealed that the deterioration in dewatering when NaClO was added alone was attributable to the insufficient oxidation capacity within the system and the excessive formation of bubbles during the conditioning process.

导出引用

蓝梅, 杨培森, 张慧龙, 孔嘉璐. 紫外光联合二价铁活化次氯酸钠对污泥脱水影响及调理机制[J]. 中国环境科学. 2026, 46(1): 238-247

LAN Mei, YANG Pei-sen, ZHANG Hui-long, KONG Jia-lu. Effects and conditioning mechanisms of sludge dewaterability by activating persulfate with a combination of ultraviolet light and ferrous iron[J]. China Environmental Science. 2026, 46(1): 238-247

中图分类号： X703

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