Enhanced Sewage Sludge Disintegration and Nutrients Release by Catalytic Microbubbles Ozonation Using Sewage Sludge-Based Char as Catalyst

Xin Zhang, Guangming Li (), Yijing Li, Yan Ma, Xiaomeng Han and Xinyu Zhou
Additional contact information
Xin Zhang: School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
Guangming Li: School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
Yijing Li: School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
Yan Ma: School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
Xiaomeng Han: Shanghai Municipal Water Resources Development and Utilization National Engineering Center Co., Ltd., Shanghai 200082, China
Xinyu Zhou: Shanghai Municipal Water Resources Development and Utilization National Engineering Center Co., Ltd., Shanghai 200082, China

Sustainability, 2023, vol. 15, issue 2, 1-11

Abstract: Using microbubble ozonation (MO) technique to disintegrate sludge is a promising sludge treatment process. To enhance the lysis and reduction of sludge, the catalytic ozonation consisting of MO and sewage sludge derived char (SC) were combined. Total solids (TS), volatile solids (VS), total nitrogen and phosphate (TN and TP) were selected as main parameters for evaluating the treatment performance both in solids and supernatant. With the utilization of the catalytic MO, the ozone utilization and sludge reduction were largely improved. At a reaction time of 90 min, an ozone utilization efficiency exceeding 99% was achieved by using a MO system. The optical ozone and sludge char dosages of 150 mg/g suspended solids (SS) and 1 g/L were found for sludge lysis, respectively. TS and VS concentrations decreased by 43% and 56%, respectively, as compared to those of 16.7% and 17.9% obtained by the treatment with MO alone under the condition of sludge solution pH 4. The supernatant soluble chemical oxygen demand (SCOD), TN, TP, NH 4 + -N and NO 3 − -N increased by 1750%, 205%, 25%, 31% and 43%, respectively. A small amount of additional SC exhibited strong catalytic activity on dissolving organic matter of the sludge, demonstrating the positive effect caused by the heterogeneous catalytic ozonation on sludge disintegration.

Keywords: sludge; microbubbles ozonation; char; disintegration (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/15/2/1641/pdf (application/pdf)
https://www.mdpi.com/2071-1050/15/2/1641/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:15:y:2023:i:2:p:1641-:d:1035842

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().