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2017, Volume 11, Issue 6

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Frontiers of Environmental Science & Engineering >> 2017, Volume 11, Issue 6 doi: 10.1007/s11783-017-0967-x

Improvement of sludge dewaterability with modified cinder via affecting EPS

. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.. School of Architectural Engineering, Heilongjiang University, Harbin 150080, China.. Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China.. 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

Available online: 2017-08-01
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Abstract

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 , SRF of the sludge decreased from 7.85 × 1012 m·kg to 2.06 × 1012 m·kg , 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.

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