Simulated Co-Substrate Threshold Manifests Steady-State Amelioration of Coal Gasification Gray Water Via Synergistic Biotransformations in Continuous-Flow Anoxic-Oxic System

Опубликована: Янв. 1, 2025

This case study explored the mechanisms influencing anoxic/oxic processes in 100 ton/h treatment system of coal gasification gray water (CGGW). It was experiencing "spiked" and COD, unstable operation. To identify issues find solution, sideline simulation experiments were commenced by installing 600 times miniaturized bioreactor 14 m3 with 70 L/h inlet flow rate. Data during start-up revealed that period sludge acclimation (24 days) stabilization (10 days), 30% reflux from oxic- to anoxic-pond, 0.8-1.2 mg L‒1 DO oxic-pond favored nitrification. However, it could not sustain denitrification without adding organic carbon anoxic-pond. Therefore, two co-substrates (glucose methanol) supplemented separately metabolic response aerobic/anaerobic ammonia-oxidizing bacteria (AerAOB/AnAOB), denitrifying (DNB). Glucose increased both ponds reflecting hampered partial anammox anoxic-pond heterotrophic non-function over DNB, intolerance AOB carbon. also declined depriving AerAOB AnAOB. Methanol addition quickly enhanced denitrification; however, later declined, spiked. By reducing methanol, effluent COD met standards again. indicated overdosed methanol exceeded DNB usage, carried oxic-pond, where restricted AOB's growth On this basis, dosage main plant reduced 2400 1540 kg/day, which meet standards, achieved plant's operational stability. These findings conceptualized CGGW model "synergistic anammox-nitrification denitrification-anammox (SPANDA)" regulated lower dosage.

Язык: Английский

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Iron-dependent autotrophic denitrification as a novel microbial driven and iron-mediated denitrification process: A critical review

Environmental Research, Год журнала: 2025, Номер unknown, С. 120808 - 120808

Опубликована: Фев. 1, 2025

Язык: Английский

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Investigation of Nitrogen Conversion Efficiency in Hydrogen-based Autotrophic Nitrate Reduction Reactor

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Фев. 10, 2025

This study investigates the performance of a hydrogen-based membrane biofilm reactor (MBfR) for nitrogen transformation over an extended operational period exceeding 200 days. During monitoring, sustained highly alkaline conditions with pH consistently 11.20, while achieving ammonia conversion efficiency above 60% and maintaining nitrite accumulation rate below 1%. Integrated mass balance calculations microbial community profiling revealed coexistence denitrification dissimilatory nitrate reduction to ammonium (DNRA) pathways within network. A factorial experimental design was implemented hydraulic retention time (HRT) influent concentration as independent variables, generating nine distinct regimes through cross-variable permutations. Subsequent analysis extensive datasets enabled development Response Surface Methodology (RSM) model simulate dynamics. Model validation confirmed statistical reliability predictive accuracy RSM framework. Critical demonstrated that in hydrogen autotrophic system exhibited significant correlation individual variables themselves but showed negligible dependence on their interactive effects. These findings provide novel insights into process optimization strategies theoretical understanding convention.

Язык: Английский

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Organic carbon-induced transition from autotrophic to mixotrophic denitrification in H2-driven biofilm systems treating low C/N wastewater

Journal of Cleaner Production, Год журнала: 2025, Номер unknown, С. 145140 - 145140

Опубликована: Фев. 1, 2025

Язык: Английский

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Investigation of nitrogen conversion efficiency in hydrogen-based autotrophic nitrate reduction reactor

Journal of Water Process Engineering, Год журнала: 2025, Номер 72, С. 107536 - 107536

Опубликована: Март 22, 2025

Язык: Английский

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Simulated co-substrate threshold manifests steady-state amelioration of coal gasification gray water via synergistic biotransformations in continuous-flow anoxic/oxic system

Journal of Water Process Engineering, Год журнала: 2025, Номер 72, С. 107537 - 107537

Опубликована: Апрель 1, 2025

Язык: Английский

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Response of algal-bacterial symbiosis to light/dark cycle in rotating biological contactor treating mariculture wastewater: Performance evaluation, enzymatic activity and response metabolism

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 162293 - 162293

Опубликована: Апрель 1, 2025

Язык: Английский

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Optimizing the Nitrogen Removal Efficiency of an Intermittent Biological Sponge Iron Reactor by Immobilizing Aerobic Denitrifying Bacteria in the Biological Sponge Iron System

Water, Год журнала: 2025, Номер 17(9), С. 1308 - 1308

Опубликована: Апрель 27, 2025

This study investigates the enhancement of nitrogen removal performance in an intermittent biological sponge iron system (BSIS) through immobilization aerobic denitrifying bacteria. The aim is to improve efficiency simultaneous nitrification and denitrification (SND) BSIS by optimizing microbial community involved conversion. technique not only stabilizes activity abundance bacteria, but also promotes a more efficient process. optimal material ratio polyvinyl alcohol–sodium alginate gel beads was determined as 10 g/100 mL PVA, 4 SA, 2 CaCl2, bacterial suspension, achieving maximum NO3−-N rate 91.73%. A response surface model (RSM), established for operational conditions, (shaker speed, temperature, pH) showed high fitting degree (R2 = 0.9960) predicted conditions 109.24 rpm, 23.6 °C, pH 7.9. Compared R1 (47.82%), R3 achieved higher average total (TN) 95.49%, following addition immobilized bacteria BSIS.

Язык: Английский

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Bio-augmentation driven sulfur autotrophic denitrification process: focusing on denitrification performance, microbial community and gene characteristics

Journal of environmental chemical engineering, Год журнала: 2024, Номер unknown, С. 114905 - 114905

Опубликована: Ноя. 1, 2024

Язык: Английский

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Efficient nitrogen and phosphorus removal performance and microbial community in a pilot-scale anaerobic/anoxic/oxic (AOA) system with long sludge retention time: Significant roles of endogenous carbon source

Environmental Research, Год журнала: 2024, Номер 263, С. 120164 - 120164

Опубликована: Окт. 15, 2024

Язык: Английский

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