A rational strategy of combining Fenton oxidation and biological processes for efficient nitrogen removal in toxic coking wastewater. (November 2022)

• Record Type: Journal Article
• Authors: Wang, Chen; Liu, Yaming; Huang, Mingjie; Xiang, Wei; Wang, Zhicheng; Wu, Xiaohui; Zan, Feixiang; Zhou, Tao
• Is Part Of: Bioresource technology. Volume 363(2022)
• Publication Date: 2022-11
• Subjects: Partial nitrification–denitrification -- Coking wastewater -- Fenton oxidation -- Biological treatment -- Ternary combined process; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127897
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: A novel ternary process was developed for removing nitrogen in coking wastewater. Oxic biological pretreatment removed most COD and SCN -, but marginal N. Fenton sub-treatment degraded residual toxic organics to protect (de)nitrifying bacteria. The final partial nitrification–denitrification process realized denitrification efficiently. Rationally combining chemical/biological processes was cost-effective for TN removal. Abstract: Effective removal of nitrogen from coking wastewaters is a great challenge, since conventional biological technologies commonly suffer from concentrated bio-toxic components such as phenolic compounds and thiocyanide (SCN - ). This study has successfully developed a novel ternary process for efficiently removing nitrogen from a practical coking wastewater, by rationally combined biological pretreatment, Fenton sub-pretreatment and final partial nitrification–denitrification (PN) process. It was noted that the oxic biological pretreatment (OP) could degrade above 80 % of COD and SCN - in the wastewater, by adopting the pristine coking wastewater sludge. Fenton sub-pretreatment would further degrade the residual toxic organics and protect the metabolic activity of nitrobacteria and denitrobacteria, realizing the efficient removal of NH4 + -N and TN that occurred in the final PN process with self-cultivated sludge. This work can provide an interesting strategy by rationally combining biological-physicochemical processes for nitrogen removal in toxic industrial wastewaters.