Improvement of sludge dewaterability with modified cinder via affecting EPS

doi:10.1007/s11783-017-0967-x

Front. Environ. Sci. Eng.

2017, Vol. 11

Issue (6) : 19 https://doi.org/10.1007/s11783-017-0967-x

RESEARCH ARTICLE

Improvement of sludge dewaterability with modified cinder via affecting EPS

Weichao Ma^1,², Lei Zhao^3,⁴, Huiling Liu¹, Qianliang Liu¹, Jun Ma¹(

)

¹. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
². School of Architectural Engineering, Heilongjiang University, Harbin 150080, China
³. Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China
⁴. Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China

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Abstract

The organic matters decreased during the conditioning with cinders.

The modified cinder could improve the dewaterability via affecting EPS.

Variation of EPS disintegrated sludge floc especially for ACMC addition.

ACMC promoted the reconstruction of sludge floc as skeleton builder via adsorption.

The reconstruction mechanisms included charge neutralization, adsorption bridging.

The relationship between the improvement of sludge dewaterability and variation of organic matters has been studied in the process of sludge pre-conditioning with modified cinder, especially for extracellular polymeric substances (EPS) in the sludge. During the conditioning process, the decreases of total organic carbon (TOC) and soluble chemical oxygen demand (SCOD) were obviously in the supernatant especially for the acid modified cinder (ACMC), which could be attributed to the processes of adsorption and sweeping. The reduction of polysaccharide and protein in supernatant indicated that ACMC might adsorb EPS so that the tightly bound EPS (TB-EPS) decreased in sludge. In the case of ACMC addition with 24 g·L⁻¹, SRF of the sludge decreased from 7.85 × 1012 m·kg⁻¹ to 2.06 × 1012 m·kg⁻¹, and the ﬁlter cake moisture decreased from 85% to 60%. The reconstruction of “floc mass” was confirmed as the main sludge conditioning mechanism. ACMC promoted the dewatering performance through the charge neutralization and adsorption bridging with the negative EPS, and provided firm and dense structure for sludge floc as skeleton builder. The passages for water quick transmitting were built to avoid collapsing during the high-pressure process.

Keywords Sludge conditioning Acid or alkali modified cinder TB-EPS Floc mass Floc reconstruction

Corresponding Author(s): Jun Ma

Issue Date: 01 August 2017

Cite this article:

Weichao Ma,Lei Zhao,Huiling Liu, et al. Improvement of sludge dewaterability with modified cinder via affecting EPS[J]. Front. Environ. Sci. Eng., 2017, 11(6): 19.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-017-0967-x
https://academic.hep.com.cn/fese/EN/Y2017/V11/I6/19

Tab.1 The experimental analysis of orthogonal test of modified cinder

Fig.1 SEM images of conditioners and the sludge conditioned. a: RC; b: ALMC; c: ACMC; d: raw sludge; a1: sludge by RC; b1: sludge by ALMC; c1: sludge by ACMC

Fig.2 Changes in TOC (a) and SCOD (b) of supernatant with different conditioners dosage. (ΔTOC=TOC_ini−TOC_fin; ΔSCOD=SCOD_ini− SCOD_fin; _ini=initial content; _fin=final content)

Fig.3 Variations of extracellular polymeric substances of sludge under different preconditions. (a) Polysaccharides and protein contents in supernatant; (b) LB-EPS and TB-EPS in sludge

Fig.4 Settling curve of sludge with different cinder dosages. (a) RC, (b) ALMC, (c) ACMC, (d) different cinder comparison in dosage of 24 g·L⁻¹

Fig.5 Sludge SRF (a) and moisture of sludge cake (b) with different conditioners dosage

Fig.6 Variations of Zeta potential (a) and particle size (b) in the conditioned sludge supernatant under different preconditions (pH of sludge=6.8)

Fig.7 Micrographs of the raw sludge (a), sludge conditioned with RC (b), ALMC (c), ACMC (d) (magnification: 10 × 10)

Fig.8 Schematic of the sludge dewatering conditioned with ACMC

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