Recyclable zero-valent iron activating peroxymonosulfate synchronously combined with thermal treatment enhances sludge dewaterability by altering physicochemical and biological properties

Yifu Li; Xingzhong Yuan; Dongbo Wang; Hou Wang; Zhibin Wu; Longbo Jiang; Dan Mo; Guojing Yang; Renpeng Guan; Guangming Zeng

doi:10.1016/j.biortech.2018.04.050

Recyclable zero-valent iron activating peroxymonosulfate synchronously combined with thermal treatment enhances sludge dewaterability by altering physicochemical and biological properties

Bioresour Technol. 2018 Aug:262:294-301. doi: 10.1016/j.biortech.2018.04.050. Epub 2018 Apr 21.

Authors

Yifu Li¹, Xingzhong Yuan¹, Dongbo Wang², Hou Wang³, Zhibin Wu⁴, Longbo Jiang¹, Dan Mo¹, Guojing Yang⁵, Renpeng Guan¹, Guangming Zeng¹

Affiliations

¹ College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
² College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China. Electronic address: dongbowang@hnu.edu.cn.
³ College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China; School of Chemical & Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 639798, Singapore.
⁴ College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China; College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, PR China.
⁵ College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China; College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315100, PR China.

PMID: 29729607
DOI: 10.1016/j.biortech.2018.04.050

Abstract

In this study, zero valent iron (ZVI) activated peroxymonosulfate (PMS) as novel technique (i.e. ZVI-PMS technology) was employed to enhance sludge dewatering. In optimal sludge dewatering conditions of ZVI and KHSO₅ dosages, the specific resistance to filtration (SRF) was reduced by 83.6%, which was further decreased to 90.6% after combination of ZVI-PMS with thermal treatment at 50 °C (i.e. ZVI-PMS-T technology). Subsequently, the ESR spectrum and quenching tests demonstrated that OH, rather than SO₄^-, was predominant radicals in ZVI-PMS conditioning. Thereafter, the variation of physicochemical properties and the distributions and compositions of extracellular polymeric substances (EPS) were further investigated to uncover the influence of these techniques on sludge bulk properties. The results indicated that sludge particles were disintegrated into smaller particles and surface charges were neutralized, sludge flowability were elevated obviously after treatments. In ZVI cycle experiment, the high dewatering efficiency was maintained by ZVI-PMS and ZVI-PMS-T pretreatment.

Keywords: Dewaterability; Extracellular polymeric substances (EPS); Thermal; Waste activated sludge (WAS); Zero valent iron (ZVI)/peroxymonosulfate (PMS).

MeSH terms

Iron / chemistry*
Oxidation-Reduction
Peroxides*
Sewage
Waste Disposal, Fluid

Substances

Peroxides
Sewage
peroxymonosulfate
Iron