A new polystyrene-latex-based and EPS-containing synthetic sludge

doi:10.1007/s11783-011-0390-7

Front Envir Sci Eng

2012, Vol. 6

Issue (1) : 131-139 https://doi.org/10.1007/s11783-011-0390-7

RESEARCH ARTICLE

A new polystyrene-latex-based and EPS-containing synthetic sludge

Ling-Ling Wang¹, Shan Chen¹, Hai-Ting Zheng², Guo-Qing Sheng¹, Zhi-Jun Wang¹, Wen-Wei Li¹, Han-Qing Yu¹(

)

1. Department of Chemistry, University of Science & Technology of China, Hefei 230026, China; 2. Department of Polymer Science and Engineering, University of Science & Technology of China, Hefei 230026, China

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Abstract

Since the living microorganisms in activated sludge continuously change, it is difficult to conduct controlled experiments and achieve reproducible results for evaluating sludge characteristics. Synthetic sludge, as a chemical surrogate to activated sludge, could be used to investigate the sludge physicochemical properties, and it is desirable to prepare synthetic sludge with similar structure and properties to real activated sludge to explore the flocculation and settlement processes in activated sludge systems. In this work, a high-strength synthetic sludge was prepared with functional polystyrene latex particles as the framework and extracellular polymeric substances (EPS) to modify its surface. The flocculation and settling characteristics of the microspheres and the prepared synthetic sludge were tested. Compared with other three functional polystyrene latex microspheres, the synthetic sludge prepared with EPS-modified polystyrene latex microspheres showed good settling characteristics and a significantly higher strength. They could be used for studying the physicochemical properties of activated sludge.

Keywords activated sludge extracellular polymeric substances (EPS) flocculation polystyrene latex particles synthetic sludge

Corresponding Author(s): Yu Han-Qing,Email:hqyu@ustc.edu.cn

Issue Date: 01 February 2012

Cite this article:

Ling-Ling Wang,Shan Chen,Hai-Ting Zheng, et al. A new polystyrene-latex-based and EPS-containing synthetic sludge[J]. Front Envir Sci Eng, 2012, 6(1): 131-139.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-011-0390-7
https://academic.hep.com.cn/fese/EN/Y2012/V6/I1/131

Fig.1 Synthetic route of: (1) PS-SOH microspheres; (2) PS-COOH microspheres; (3) PS-Al microspheres; and (4) PS-EPS microspheres.

Fig.2 Synthetic sludge preparation procedure: Step 1. microspheres were suspended; Step 2. alginate and cellulose were added and stirred for 12 h; and Step 3. CaCl was dosed and synthetic sludge was formed

Tab.1 Zeta potentials and sizes of the PS-CHCl, PS-SOH, PS-COOH, PS-Al and PS-EPS particles

Fig.3 IR spectroscopy of PS-SOH, PS-COOH, PS-Al and PS-EPS microspheres

Fig.4 Settling properties of PS-SOH, PS-COOH, PS-Al and PS-EPS microspheres

Fig.5 Settling properties of four types of synthetic sludge and activated sludge: (a) time= 0; and (b) time= 10 min. Synthetic sludge was prepared with the PS-SOH, PS-COOH, PS-Al and PS-EPS microspheres from left to right, respectively

Fig.6 Images of the synthetic sludge with the four types of microspheres and activated sludge after 10-s settling: (a) PS-SOH; (b) PS-COOH; (c) PS-Al; (d) PS-EPS and (e) activated sludge

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