Achieving synergetic treatment of sludge supernatant, waste activated sludge and secondary effluent for wastewater treatment plants (WWTPs) sustainable development. (October 2021)

• Record Type: Journal Article
• Authors: Zhang, Fangzhai; Peng, Yongzhen; Wang, Zhong; Jiang, Hao; Ren, Shang; Qiu, Jingang
• Is Part Of: Bioresource technology. Volume 337(2021)
• Publication Date: 2021-10
• Subjects: Co-treatment of wastewater and sludge -- Advanced nitrogen removal -- Fermentation -- Anammox -- Partial denitrification; 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.2021.125416
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: NFAD treated sludge supernatant, WAS, and secondary effluent simultaneously. Satisfactory NRE of 98.7% and SRE of 44.6% were obtained. Anammox contributed up to 84.1% nitrogen removal in AD-UASB. In-situ fermentation contributed 13.3% electronic donor for partial denitrification. Abstract: A novel process that combines partial nitrification, fermentation and Anammox-partial denitrification (NFAD) was proposed to co-treat ammonia rich sludge supernatant (NH4 + -N = 1194.1 mg/L), external WAS (MLSS = 22092.6 mg/L) and WWTP secondary effluent (NO3 – -N = 58.6 mg/L). Three separated reactors were used for partial nitrification (PN-SBR), integrated fermentation and denitrification (IFD-SBR) and combined Anammox-partial denitrification (AD-UASB), respectively. The process resulted in excellent nitrogen removal efficiency (NRE) of 98.7%, external sludge reduction efficiency (SRE) of 44.6% and external sludge reduction rate of 4.1 kg/m 3 after 200 days of continuous operation. IFD-SBR and AD-UASB contributed towards 89.4% and 9.2% nitrogen removal, respectively. In AD-UASB, cooperation between Anammox bacteria (4.1% Candidatus Brocadia ) and partial denitrifying bacteria (3.2% Thauera ) resulted in significant stability of Anammox pathway, which contributed up to 84.1% nitrogen removal in the combined Anammox-partial denitrification process. NFAD saved up to 100% organic resource demand and 25% of aeration consumption compared with the traditional nitrification–denitrification process.