不同方式活化过硫酸盐对污泥过滤性能及胞外聚合物的影响

doi:10.19965/j.cnki.iwt.2024-0828

摘要/Abstract

摘要：

分别采用热和铁（Ⅱ）活化过硫酸盐（PDS）对污泥进行预处理，对比考察两种活化方式下PDS氧化调理对污泥过滤性能的改善情况，并采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X光电子能谱（XPS）、傅里叶红外光谱（FT-IR）、有机碳-有机氮检测器分析污泥胞外聚合物（EPS）特性的变化。结果表明，相较于热（80 ℃）活化，Fe（Ⅱ）（16.8 mg/g）/PDS改善污泥过滤性能的效果更佳，在PDS投加量为238 mg/g时，过滤时间和泥饼含水率分别下降75.4%和8.7%。热/PDS和Fe（Ⅱ）/PDS均可破坏EPS的链状结构，使污泥产生孔隙便于水分输送，且使EPS中小分子中性物质占比减少，其中热活化组小分子中性物质占比从78%降至58%，Fe（Ⅱ）活化组该占比降至38%。

关键词: 污泥脱水, 过硫酸盐, 二价铁离子, 胞外聚合物, 有机碳

Abstract:

Thermal and iron(Ⅱ) activated persulfate(PDS) were used to pretreat sludge, and the improvement of sludge filtration performance by PDS oxidation conditioning under two activation methods was compared and investigated. Scanning electron microscope(SEM), transmission electron microscope(TEM), X-ray photoelectron spectroscopy(XPS), Fourier transform infrared spectroscopy(FT-IR), and organic carbon-organic nitrogen detector were used to analyze the changes in the characteristics of extracellular polymeric substances(EPS) of sludge. The results showed that compared to thermal(80 ℃) activation, Fe(Ⅱ) (16.8 mg/g)/PDS had better effect on improving sludge filtration performance, with the decrease of 75.4% in filtration time and 8.7% in sludge cake moisture content under PDS dosage of 238 mg/g. Both thermal/PDS and Fe(Ⅱ)/PDS could destroy the chain structure of EPS, create pores in sludge for water transport, and reduce the proportion of small molecule neutral substances in EPS. The proportion of small molecule neutral substances in the thermal activation group was decreased from 78% to 58%, and the proportion in the Fe(Ⅱ) activation group was decreased to 38%.

Key words: sludge dewatering, persulfate, ferrous iron, extracellular polymer substances, organic carbon

中图分类号:

X703.1

郭绍东, 王张羽, 刘赛, 周龙, 尹希. 不同方式活化过硫酸盐对污泥过滤性能及胞外聚合物的影响[J]. 工业水处理, 2025, 45(10): 94-101.

Shaodong GUO, Zhangyu WANG, Sai LIU, Long ZHOU, Xi YIN. Effects of different activated persulfate on the filtration performance and extracellular polymers of sludge[J]. Industrial Water Treatment, 2025, 45(10): 94-101.

https://www.iwt.cn/CN/Y2025/V45/I10/94

图/表 8

图1 污泥过滤时间（a）、可滤体积（b）、泥饼含水率（c）及黏度（d）的变化

Fig.1 Changes of sludge filtration time（a），filtration volume（b），mud cake moisture content（c） and viscosity（d）

图2 原泥（a）、热/PDS处理污泥（b）和Fe（Ⅱ）/PDS处理污泥（c）的SEM

Fig.2 SEM of raw sludge（a）， thermal /PDS treated sludge（b） and Fe（Ⅱ）/PDS treated sludge（c）

图3 原泥、热/PDS处理污泥、Fe（Ⅱ）/PDS处理污泥的FT-IR

Fig.3 FT-IR of raw sludge，thermal /PDS treated sludge，and Fe（Ⅱ） /PDS treated sludge

图4 原泥（a）、热/PDS处理污泥（b）、Fe（Ⅱ）/PDS处理污泥（c）中EPS的SEM，及原泥（d）、热/PDS处理污泥（e）、Fe（Ⅱ）/PDS处理污泥（f）中EPS的TEM

Fig.4 SEM of EPS in raw sludge（a），thermal/PDS treated sludge（b），Fe（Ⅱ）/PDS treated sludge（c），and TEM of EPS in raw sludge（d），thermal/PDS treated sludge（e），Fe（Ⅱ）/PDS treated sludge（f）

图5 原泥、热/PDS处理污泥、Fe（Ⅱ）/PDS处理污泥EPS的 FT-IR

Fig.5 FT-IR of EPS in raw sludge， thermal /PDS treated sludge， and Fe（Ⅱ）/PDS treated sludge

图6 原泥、热/PDS处理污泥和Fe（Ⅱ）/PDS处理污泥C 1s、N 1s和O 1s的XPS

Fig.6 XPS spectra of C 1s，N 1s and O 1s in raw sludge，thermal/PDS treated sludge and Fe（Ⅱ）/PDS treated sludge

表1 DOM分析 (%)

Table 1 DOM analysis

样品	HOC占比	CDOC占比
样品	HOC占比	生物聚合物	腐殖质	构造块	小分子酸	小分子中性物质	总计
原泥DOM（丰度873）	0	12.9	0.1	5.4	3.4	78.2	100.0
热/PDS组DOM（丰度1 503）	0	21.0	13.0	8.0	0.1	57.9	100.0
Fe（Ⅱ）/PDS组DOM（丰度294）	56.0	1.0	0.1	3.1	2.3	37.5	44.0

图7 Fe（Ⅱ）/PDS和热/PDS处理后污泥EPS蛋白质（a）和多糖（b）的变化

Fig.7 Changes in EPS proteins（a） and polysaccharides（b） of sludge after Fe（Ⅱ）/PDS and thermal/PDS treatments

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