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Waste heat promoted ammonia recovery from sludge lysate using a MES-TMCS system: thermal-electric-microbial synergies.

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Τίτλος: Waste heat promoted ammonia recovery from sludge lysate using a MES-TMCS system: thermal-electric-microbial synergies.
Συγγραφείς: Zhai S; School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China., Wang X; School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China., Ma W; School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China., Wang Q; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China., Liu C; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China; Jianghan Machinery Research Institute Limited Company of CNPC, Wuhan, 430021, China. Electronic address: liuchengyandr@cnpc.com.cn., Liu W; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China., Zhao Y; School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China., Wang A; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China. Electronic address: waj0578@hit.edu.cn., Cheng HY; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China. Electronic address: chenghaoyi@hit.edu.cn.
Πηγή: Water research [Water Res] 2026 Oct 15; Vol. 305, pp. 126445. Date of Electronic Publication: 2026 Jul 06.
Τύπος έκδοσης: Journal Article
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Pergamon Press Country of Publication: England NLM ID: 0105072 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-2448 (Electronic) Linking ISSN: 00431354 NLM ISO Abbreviation: Water Res Subsets: MEDLINE
Imprint Name(s): Original Publication: Oxford, Pergamon Press.
Ιατρικοί όροι (MeSH): Ammonia*/isolation & purification , Sewage*/chemistry , Sewage*/microbiology , Waste Disposal, Fluid*/methods , Electrochemical Techniques*/methods, Hot Temperature ; Nitrogen
Περίληψη: Sludge lysate from low-temperature pyrolysis is rich in high ammonia and waste heat (<100 °C), yet its conversional treatment is energy- and chemical- intensive. Microbial electrochemical systems (MES) coupled with ammonia recovery technologies have shown considerable potential for nitrogen recovery, but remain untested for such thermally impacted wastewaters. Here, an MES coupled with a transmembrane capture system (MES-TMCS) was applied to sludge lysate to investigate the ammonia recovery performance and underlying mechanisms under controlled temperature (25-45 °C). The best performance was achieved when both chambers were maintained at 45 °C. The NH₄⁺-N removal efficiency reached 81.26 ± 11.01%, representing a 31.77-percentage-point increase over the room-temperature group. The recovery ratio reached 0.94 ± 0.09, corresponding to a 1.65-fold improvement. Meanwhile, current generation was enhanced by 2.46-fold, and the system completely eliminated external alkali addition by exploiting cathodic OH- production. Analysis of FT-ICR-MS indicated that elevated temperature likely promoted to the partial biotransformation of nitrogen-containing organics (CHON) during microbial electrochemical conversion. The high temperature selectively enriched thermophilic electroactive bacteria (Desulfurella and Thermincola) and anaerobic degraders (Caldicellulosiruptor), which could enhance the electron transfer and refractory organics breakdown, thereby increasing NH4+ electromigration. Moreover, the elevated temperature lowered the pKa of the NH₄⁺/NH₃ equilibrium, reduced the mass-transfer resistance of NH₃, and facilitated subsequent NH₃ transfer and transmembrane capture. Overall, these finding suggest a potential thermal-electric-microbial coupling mechanism, in which elevated temperature enhances electrochemical reactions, promotes ammonia phase conversion, and enhances transmembrane capture, ultimately boosting ammonia recovery. The MES-TMCS offers an alkali-free strategy coupled with residual heat reuse for carbon-nitrogen separation and ammonia recovery from waste heat contained complex wastewaters, supporting the low-grade thermal energy utilization.
(Copyright © 2026 Elsevier Ltd. All rights reserved.)
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Contributed Indexing: Keywords: Ammonia recovery; Microbial electrochemical systems; Organic nitrogen transformation; Sludge lysate; Waste heat utilization
Substance Nomenclature: 7664-41-7 (Ammonia)
0 (Sewage)
N762921K75 (Nitrogen)
Entry Date(s): Date Created: 20260714 Date Completed: 20260909 Latest Revision: 20260909
Update Code: 20260909
DOI: 10.1016/j.watres.2026.126445
PMID: 42447665
Βάση Δεδομένων: MEDLINE
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  Data: Waste heat promoted ammonia recovery from sludge lysate using a MES-TMCS system: thermal-electric-microbial synergies.
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  Data: &lt;searchLink fieldCode=&quot;AU&quot; term=&quot;%22Zhai+S%22&quot;&gt;Zhai S&lt;/searchLink&gt;; School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.&lt;br /&gt;&lt;searchLink fieldCode=&quot;AU&quot; term=&quot;%22Wang+X%22&quot;&gt;Wang X&lt;/searchLink&gt;; School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.&lt;br /&gt;&lt;searchLink fieldCode=&quot;AU&quot; term=&quot;%22Ma+W%22&quot;&gt;Ma W&lt;/searchLink&gt;; School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.&lt;br /&gt;&lt;searchLink fieldCode=&quot;AU&quot; term=&quot;%22Wang+Q%22&quot;&gt;Wang Q&lt;/searchLink&gt;; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China.&lt;br /&gt;&lt;searchLink fieldCode=&quot;AU&quot; term=&quot;%22Liu+C%22&quot;&gt;Liu C&lt;/searchLink&gt;; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China; Jianghan Machinery Research Institute Limited Company of CNPC, Wuhan, 430021, China. Electronic address: liuchengyandr@cnpc.com.cn.&lt;br /&gt;&lt;searchLink fieldCode=&quot;AU&quot; term=&quot;%22Liu+W%22&quot;&gt;Liu W&lt;/searchLink&gt;; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China.&lt;br /&gt;&lt;searchLink fieldCode=&quot;AU&quot; term=&quot;%22Zhao+Y%22&quot;&gt;Zhao Y&lt;/searchLink&gt;; School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.&lt;br /&gt;&lt;searchLink fieldCode=&quot;AU&quot; term=&quot;%22Wang+A%22&quot;&gt;Wang A&lt;/searchLink&gt;; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China. Electronic address: waj0578@hit.edu.cn.&lt;br /&gt;&lt;searchLink fieldCode=&quot;AU&quot; term=&quot;%22Cheng+HY%22&quot;&gt;Cheng HY&lt;/searchLink&gt;; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China. Electronic address: chenghaoyi@hit.edu.cn.
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  Data: Sludge lysate from low-temperature pyrolysis is rich in high ammonia and waste heat (&amp;lt;100 &#176;C), yet its conversional treatment is energy- and chemical- intensive. Microbial electrochemical systems (MES) coupled with ammonia recovery technologies have shown considerable potential for nitrogen recovery, but remain untested for such thermally impacted wastewaters. Here, an MES coupled with a transmembrane capture system (MES-TMCS) was applied to sludge lysate to investigate the ammonia recovery performance and underlying mechanisms under controlled temperature (25-45 &#176;C). The best performance was achieved when both chambers were maintained at 45 &#176;C. The NH₄⁺-N removal efficiency reached 81.26 &#177; 11.01%, representing a 31.77-percentage-point increase over the room-temperature group. The recovery ratio reached 0.94 &#177; 0.09, corresponding to a 1.65-fold improvement. Meanwhile, current generation was enhanced by 2.46-fold, and the system completely eliminated external alkali addition by exploiting cathodic OH&lt;superscript&gt;-&lt;/superscript&gt; production. Analysis of FT-ICR-MS indicated that elevated temperature likely promoted to the partial biotransformation of nitrogen-containing organics (CHON) during microbial electrochemical conversion. The high temperature selectively enriched thermophilic electroactive bacteria (Desulfurella and Thermincola) and anaerobic degraders (Caldicellulosiruptor), which could enhance the electron transfer and refractory organics breakdown, thereby increasing NH&lt;subscript&gt;4&lt;/subscript&gt;&lt;superscript&gt;+&lt;/superscript&gt; electromigration. Moreover, the elevated temperature lowered the pKa of the NH₄⁺/NH₃ equilibrium, reduced the mass-transfer resistance of NH₃, and facilitated subsequent NH₃ transfer and transmembrane capture. Overall, these finding suggest a potential thermal-electric-microbial coupling mechanism, in which elevated temperature enhances electrochemical reactions, promotes ammonia phase conversion, and enhances transmembrane capture, ultimately boosting ammonia recovery. The MES-TMCS offers an alkali-free strategy coupled with residual heat reuse for carbon-nitrogen separation and ammonia recovery from waste heat contained complex wastewaters, supporting the low-grade thermal energy utilization.&lt;br /&gt; (Copyright &#169; 2026 Elsevier Ltd. All rights reserved.)
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  Data: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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