Cation-exchange resin regeneration waste liquid as alternative NaCl source for enhancing anaerobic fermentation of waste activated sludge: Compositions of dissolved organic matters and chemical conditioning performance

Heliang Pang; Xinxin Jiang; Deqiang Li; Junguo He; Zhongsen Yan; Yingqun Ma; Shiyi Luo; Jun Nan

doi:10.1016/j.biortech.2020.123659

Cation-exchange resin regeneration waste liquid as alternative NaCl source for enhancing anaerobic fermentation of waste activated sludge: Compositions of dissolved organic matters and chemical conditioning performance

Bioresour Technol. 2020 Oct:313:123659. doi: 10.1016/j.biortech.2020.123659. Epub 2020 Jun 10.

Authors

Heliang Pang¹, Xinxin Jiang², Deqiang Li³, Junguo He⁴, Zhongsen Yan⁵, Yingqun Ma⁶, Shiyi Luo⁷, Jun Nan²

Affiliations

¹ School of Environment, Harbin Institute of Technology, Harbin 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China; Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore. Electronic address: 15B927008@hit.edu.cn.
² School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
³ Architectural Design and Research Institute of Guangdong Province, Guangzhou 510006, PR China.
⁴ School of Environment, Harbin Institute of Technology, Harbin 150090, PR China; School of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China. Electronic address: junguohe@263.net.
⁵ College of Civil Engineering, Fuzhou University, Fuzhou 350116, PR China.
⁶ Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore.
⁷ State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

PMID: 32554151
DOI: 10.1016/j.biortech.2020.123659

Abstract

This study reported the NaCl-enhanced anaerobic fermentation with cation-exchange resin regeneration waste liquid (CRWL) as alternative NaCl source for waste activated sludge (WAS) disposal and carbon recovery. Through 4-day CRWL-enhanced anaerobic fermentation at Na⁺ concentration of 0.34 mol/L, the Na⁺-caused sludge disintegration triggered numerous release of dissolved organic matters (DOMs), i.e. 371.6 mg/g VSS, with composition distribution: acetic acid (28.2%) > butyric acid (16.1%) ≈ valeric acid (17.8%) ≈ proteins (16.4%) > propionic acid (14.4%) > unknown (3.2%) > carbohydrates (3.9%). Satisfying chemical conditioning performance for the fermented sludge was observed at the FeCl₃ dosage of 0.3 g/g DS, attributing to the roles of double-layer compression and electric neutralization. The capillary suction time (CST) and sludge cake moisture content were decreased to 60.3 s and 75.1%, against those of 607 s and 93.5% before conditioning, respectively. Such "treating waste by waste" strategy could provide numerous environmental and economic benefits.

Keywords: Anaerobic fermentation; Cation-exchange resin regeneration waste liquid; Chemical conditioning; Organic compositions; Waste activated sludge.

MeSH terms

Anaerobiosis
Cations
Fatty Acids, Volatile
Fermentation
Sewage*
Sodium Chloride*
Waste Disposal, Fluid

Substances

Cations
Fatty Acids, Volatile
Sewage
Sodium Chloride