Study on the disintegration mechanism of excess sludge under the chemical effect of ultrasonic cavitation

doi:10.19965/j.cnki.iwt.2024-0607

Abstract

Abstract:

To investigate the chemical effect of ultrasonic disintegration of excess sludge,bacteria and excess sludge were treated with ultrasonic for 0-40 min,and the content of H₂O₂ produced during the process was measured. In addition,bacteria and excess sludge were treated with the same amount of H₂O₂ as produced during the ultrasonic process. The effect of isopropanol on the ultrasonic disintegration of excess sludge was analyzed. The results showed that the content of H₂O₂ increased continuously after ultrasonic treatment of bacteria and excess sludge,which verified the existence of the chemical effect of ultrasonic cavitation. Both ultrasonic and H₂O₂ had disintegration effect on bacteria,and multiple effects of ultrasonic cavitation could promote cytoplasmic efflux. By comparing the disintegration rates of ultrasonic and H₂O₂ on excess sludge,and the reduction rates of nucleic acid and peptidoglycan concentration after ultrasonic and ultrasonic with the addition of isopropanol,it was concluded that the chemical effect of ultrasonic cavitation contributed about 10% to the disintegration of excess sludge.

Key words: ultrasonic, excess sludge, sludge disintegration, bacteria

摘要：

为考察超声破解剩余污泥的化学效应，用超声对细菌和剩余污泥各作用0~40 min，测量其过程中产生的H₂O₂质量浓度，再用0~40 min内产生相应量的H₂O₂作用细菌和剩余污泥，并对比分析加入异丙醇前后超声对剩余污泥的破解情况。研究结果表明：超声作用细菌和剩余污泥后H₂O₂浓度持续增加，验证了超声空化存在化学效应，超声和H₂O₂对细菌均有破解作用，超声空化的多种效应能促使细胞质流出。通过对比超声和H₂O₂对剩余污泥的破解率、超声和添加异丙醇的超声作用剩余污泥后核酸和肽聚糖浓度的降低率发现，超声空化的化学效应对剩余污泥破解的贡献率为10%左右。

关键词: 超声, 剩余污泥, 污泥破解, 细菌

CLC Number:

X705

Meiyan YOU, Jin HAN, Xiuxiu ZHANG, Yuanhua XIE, Tong ZHU. Study on the disintegration mechanism of excess sludge under the chemical effect of ultrasonic cavitation[J]. Industrial Water Treatment, 2025, 45(8): 90-95.

由美雁, 韩进, 张秀秀, 谢元华, 朱彤. 超声空化化学效应破解剩余污泥的机制研究[J]. 工业水处理, 2025, 45(8): 90-95.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-0607

https://www.iwt.cn/EN/Y2025/V45/I8/90

Figures/Tables 10

Fig.1 The concentration of H₂O₂ produced during ultrasonic of deionized water，bacteria and excess sludge

Fig.2 The increase rate of disintegration index after H₂O₂ on bacteria

Fig.3 Concentrations of nucleic acid and peptidoglycan in bacteria treated with ultrasound and H₂O₂

Fig.4 Malondialdehyde concentration in bacteria treated with ultrasound and H₂O₂

Fig.5 Transmission electron microscopy analysis of bacteria treated with ultrasound and H₂O₂

Fig.6 Concentrations of peptidoglycan，SCOD，protein and nucleic acid in excess sludge treated with ultrasonic and H₂O₂

Fig.7 Comparison of disintegration rate of excess sludge treated with ultrasonic and H₂O₂

Fig.8 Comparison of excess sludge disintegration effects under three conditions

Fig.9 Nucleic acid and peptidoglycan concentrations after ultrasonic treatment of excess sludge under two conditions

Fig.10 Comparison of ultrasonic disintegration effects on excess sludge before and after adding isopropanol

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