Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/161937
Title: Mitigation of inhibitory effect of THP-AD centrate on partial nitritation and anammox: insights into ozone pretreatment
Authors: Cao, Shenbin
Du, Rui
Yan, Wangwang
Zhou, Yan
Keywords: Engineering::Environmental engineering
Issue Date: 2022
Source: Cao, S., Du, R., Yan, W. & Zhou, Y. (2022). Mitigation of inhibitory effect of THP-AD centrate on partial nitritation and anammox: insights into ozone pretreatment. Journal of Hazardous Materials, 431, 128599-. https://dx.doi.org/10.1016/j.jhazmat.2022.128599
Journal: Journal of Hazardous Materials
Abstract: Anaerobic digestion centrate produced from thermal hydrolysis pretreated sludge (THP-AD centrate) has serious inhibitory effect on ammonium oxidizing bacteria (AOB) and anammox bacteria. This imposes huge challenge to employ partial nitritation/anammox (PN/A) process to treat THP-AD centrate. This study, for the first time, presented an effective strategy, ozone pretreatment, to alleviate such inhibitory effect. The activities of AOB and anammox bacteria increased with increasing ozone dosage, which were likely related to the transformation of organic compounds including humic acid-like and fulvic acid-like substances as well as high molecular weight (HMW) protein. Long-term operation of PN/A system further demonstrated the improved performance in term of nitrogen removal, organics degradation as well as sludge settleability and effluent solids. Nitrogen removal rate (NRR) of 0.64 Kg N/m3/d was achieved (1.38 g O3/ g COD), which was 42.2% higher compared to treating untreated THP-AD centrate. Effluent nitrate, the by-product of PN/A process, was reduced by 39.7% despite of its release in ozonation. This was due to the enhanced denitrification activity, humic acid-like and fulvic acid-like substances as well as HMW protein were significantly reduced. Overall, this study provides a promising method to improve PN/A performance and final effluent quality when treating organic-rich THP-AD centrate.
URI: https://hdl.handle.net/10356/161937
ISSN: 0304-3894
DOI: 10.1016/j.jhazmat.2022.128599
Rights: © 2022 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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