Role of surfactants on the hydrolysis and acidogenesis of waste-activated sludge

Lin XuJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing210094, Jiangsu Province, China, Tel./Fax: +86 25 84315941;EIA Section, Nanjing Yuanheng Institute for Environmental Studies Co. Ltd., Nanjing210049, Jiangsu Province, China

Can ChenJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing210094, Jiangsu Province, China, Tel./Fax: +86 25 84315941;Institute of Environmental Engineering Technology, Guangdong Provincial Academy of Enviromental Science, Guangzhou510045, Guangdong Province, China

Na LiJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing210094, Jiangsu Province, China, Tel./Fax: +86 25 84315941

Xiuyun SunJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing210094, Jiangsu Province, China, Tel./Fax: +86 25 84315941Correspondence[email protected]

Jinyou ShenJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing210094, Jiangsu Province, China, Tel./Fax: +86 25 84315941

Jiansheng LiJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing210094, Jiangsu Province, China, Tel./Fax: +86 25 84315941

Lianjun WangJiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing210094, Jiangsu Province, China, Tel./Fax: +86 25 84315941Correspondence[email protected]

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Abstract

The role of a biosurfactant (i.e. alkyl polyglycosides, APG in short) and a chemical surfactant (i.e. sodium dodecyl sulfate, SDS in short) on the hydrolysis and acidogenesis of waste-activated sludge was investigated in this study. The results showed that both sludge hydrolysis and short-chain fatty acids (SCFAs) accumulation were increased by APG or SDS addition. The maximum SCFAs concentrations were as high as 2,330 mg L⁻¹ at SDS dosage of 0.2 g g⁻¹ TSS, and 2,222 mg L⁻¹ at APG dosage of 0.2 g g⁻¹ TSS, while the maximum SCFAs concentration was only 1,212 mg L⁻¹ in the blank test. In addition, the distribution of individual SCFA was also influenced significantly at the presence of these two surfactants. With the addition of APG or SDS, α-glucosidase and protease activities were enhanced, while the activity of the hydrolase decreased with the increase in the incubation time. Comparison of sludge surface morphology showed that the sludge matrix could be broken up at the presence of the two surfactants. The enhanced production of SCFAs at the presence of the APG or SDS was mainly caused by biological effect rather than chemical effect. Moreover, the contribution to SCFAs production by the degradation of the two surfactants was negligible.

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Acknowledgment

The research was funded by the National Natural Science Foundation of China (No. 51278248).

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Role of surfactants on the hydrolysis and acidogenesis of waste-activated sludge

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Role of surfactants on the hydrolysis and acidogenesis of waste-activated sludge

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