剩余活性污泥有机质资源原位回收利用驱动晚期垃圾渗滤液深度脱氮——一种具有显著能源优势的创新生物技术

Fangzhai Zhang; Shang Ren; Haoran Liang; Zhaozhi Wang; Ying Yan; Jiahui Wang; Yongzhen Peng

doi:10.1016/j.eng.2023.03.005

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工程（英文） ›› 2024, Vol. 34 ›› Issue (3) : 120-132. DOI: 10.1016/j.eng.2023.03.005

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剩余活性污泥有机质资源原位回收利用驱动晚期垃圾渗滤液深度脱氮——一种具有显著能源优势的创新生物技术

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Organics Recovery from Waste Activated Sludge In-Situ Driving Efficient Nitrogen Removal from Mature Landfill Leachate: An Innovative Biotechnology with Energy Superiority

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・PN/DN-F/DN enabled simultaneous treatment of WAS and mature landfill leachate.

・An average of 19 350.6 mg COD organics were recovered per operational cycle with 95.2% NRE.

・Ultra-fast sludge reduction rate of 4.89 kg/m3·d was obtained with 53.4% sludge reduction.

・PN/DN-F/DN total benefit in equivalent terms of energy was 291.8 kW·h/t TS.

Abstract

The sustainable recovery and utilization of sludge bioenergy within a circular economy context has drawn increasing attention, but there is currently a shortage of reliable technology. This study presents an innovative biotechnology based on free nitrous acid (FNA) to realize sustainable organics recovery from waste activated sludge (WAS) in-situ, driving efficient nitrogen removal from ammonia rich mature landfill leachate by integrating partial nitrification, fermentation, and denitrification process (PN/DN-F/DN). First, ammonia ((1708.5 ± 142.9) mg·L⁻¹) in mature landfill leachate is oxidized to nitrite in the aerobic stage of a partial nitrification coupling denitrification (PN/DN) sequencing batch reactor (SBR), with nitrite accumulation ratio of 95.4% ± 2.5%. Then, intermediate effluent (NO₂⁻-N = (1196.9 ± 184. 2) mg·L⁻¹) of the PN/DN-SBR, along with concentrated WAS (volatile solids (VSs) = (15 119.8 ± 2 484.2) mg·L⁻¹), is fed into an anoxic reactor for fermentation coupling denitrification process (F/DN). FNA, the protonated form of nitrite, degrades organics in the WAS to the soluble fraction by the biocidal effect, and the released organics are utilized by denitrifiers to drive NO_x⁻ reduction. An ultra-fast sludge reduction rate of 4.89 kg·m⁻³·d⁻¹ and nitrogen removal rate of 0.46 kg·m⁻³·d⁻¹ were realized in the process. Finally, F/DN-SBR effluent containing organics is refluxed to PN/DN-SBR for secondary denitrification in the post anoxic stage. After 175 d operation, an average of 19 350.6 mg chemical oxygen demand organics were recovered per operational cycle, with 95.2% nitrogen removal and 53.4% sludge reduction. PN/DN-F/DN is of great significance for promoting a paradigm transformation from energy consumption to energy neutral, specifically, the total benefit in equivalent terms of energy was 291.8 kW·h·t⁻¹ total solid.

Keywords

Waste activated sludge / Bioresource recovery / Simultaneous treatment of wastewater and sludge / Mature landfill leachate / Free nitrous acid

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Fangzhai Zhang, Shang Ren, Haoran Liang. . Engineering. 2024, 34(3): 120-132 https://doi.org/10.1016/j.eng.2023.03.005

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