Low-carbon nitrogen removal from power plants circulating cooling water and municipal wastewater by partial denitrification-anammox

• Published in: Bioresource Technology Vol. 380; p. 129071
• Main Authors: Deng, Jiayuan, Xiao, Xiangmin, Li, Yu-You, Liu, Jianyong
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.07.2023; Elsevier BV
• Subjects: Anaerobic Ammonia Oxidation; Bioreactors; Bioreactors - microbiology; Chemically enhanced primary treatment; Denitrification; Municipal wastewater; Nitrogen; Oxidation-Reduction; Partial denitrification-anammox; Power plant circulating cooling water; Resource recovery; Sewage; Wastewater; Water reclamation; Resource recovery; Chemically enhanced primary treatment; Partial denitrification-anammox; Water reclamation; Power plant circulating cooling water; Municipal wastewater
• ISSN: 0960-8524; 1873-2976; 1873-2976
• DOI: 10.1016/j.biortech.2023.129071

[Display omitted] •PPCCW and municipal wastewater realised nitrogen removal without external carbon.•Effluent TN as low as was 8.0 mg N/L achieved by adjusting the C/N to 3.46 ± 0.16.•67% COD in the municipal wastewater can be captured and recovered.•Hydrolytic acidifying bacteria promoted the removal of COD and nitrogen.•A novel scheme for sustainable municipal wastewater treatment is proposed. As a reclaimed water reuse strategy, using treated municipal wastewater as power plants circulating cooling water (PPCCW) generates nitrate-rich wastewater due to evaporation requiring retreatment. An innovative low-carbon nitrogen removal process, partial denitrification-anammox (PD-A), was used in this study. The PPCCW and municipal wastewater pre-treated with 10 mg/L Fe3+ were simultaneously subjected to the PD-A process. The results showed that the total nitrogen of effluent less than 10 mg/L, and a removal efficiency of 79.67 ± 3.48% was attained. Unclassified_f_Brocadiaceae was the dominant anammox genus, with an increasing percentage (from 0.42 to 1.27%), laterally indicating the reactor stability. Furthermore, the hydrolytic acidifying bacteria SBR1031 and Bacillus increased substantially after feeding with actual wastewater, and the removal efficiencies of organic material and nitrogen increased, indicating that hydrolytic acidifying bacteria have a synergistic effect with PD-A bacteria. Finally, a novel wastewater treatment process that fully recovers carbon, phosphorus, and water was proposed.