The experiment was carried out to study the reasonable composition of stable anaerobic sludge in the extensive green roof growth substrate by a total of 650 mm artificial rainfall event. Combined with the N, P leaching problem of the sludge resources utilization, the quality of the effluent and the change of the nutrient content of the substrate in the process of application were investigated. The results showed that the anaerobic sludge could significantly increase the plant biomass and the average weight gain was 808%. Stable anaerobic sludge caused a large amount of leaching of TP and water treatment residual could effectively control TP leaching and did not affect the absorption of P to the plant. During the experiment, the TP of the effluent was reduced by 68.66%.After stabilization, the effluent TP reached the surface water Ⅴ standard. The main form of leached TN was NO-N and the leaching of NO-N could be reduced by rice husk charcoal. In the experiment, the NO -N leaching mass was reduced by 28.86% totally. Increasing the amount of rice husk charcoal helped to control NO-N leaching. SS and COD could be quickly decreased and stabilized. The COD of effluent after stabilization was about 30 mg·L, which was better than the standard of surface water Ⅴ. Under the condition of actual precipitation with medium and small rainfall, the anaerobic sludge nutrient retention time should be more than 1 year, which meets the growing needs of plants for a long time.
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http://dx.doi.org/10.13227/j.hjkx.201701196 | DOI Listing |
Bioresour Technol
January 2025
School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, PR China.
The hybrid bioreactor combining sulfate-reducing ammonium oxidation (Sulfammox) and Anammox offered potential for simultaneous nitrogen and sulfur removal, but the removal efficiency and microbial mechanism remain unclear. This study demonstrated that in the hybrid bioreactor, the ammonium utilization rate (AUR) of Sulfammox increased by 5.42 times.
View Article and Find Full Text PDFBioresour Technol
January 2025
College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
Nanobubble water (NBW) or temperature-phased anaerobic digestion assisted by microbial electrolysis cell (MEC-TPAD) can promote sludge hydrolysis and methanogenesis. However, the role of the combined application of NBW and MEC-TPAD in terms of anaerobic performance and related microbial properties remains unclear. This study investigated the impact of Air-NBW on hydrolysis and methanogenesis of dewatered sludge MEC-TPAD.
View Article and Find Full Text PDFMicrob Cell Fact
January 2025
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
Background: The composition of anaerobically digested sludge is inherently complex, enriched with structurally complex organic compounds and nitrogenous constituents, which are refractory to biodegradation. These characteristics limit the subsequent rational utilization of resources from anaerobically digested sludge. White-rot fungi (WRF) have garnered significant research interest due to their exceptional capacity to degrade complex and recalcitrant organic pollutants.
View Article and Find Full Text PDFBioresour Technol
January 2025
School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China. Electronic address:
Organic carbon can influence nitrogen removal during the anaerobic ammonia oxidation (anammox) process. Propionate, a common organic compound in pretreated wastewater, its impacts on mixotrophic anammox bacteria and the underlying mechanisms have not been fully elucidated. This study investigated the core metabolism and shift in behavior patterns of mixotrophic Candidatus Brocadia sapporoensis (AMXB) under long-term propionate exposure.
View Article and Find Full Text PDFChemosphere
January 2025
DICAR University of Pavia, Pavia, 27100, Italy. Electronic address:
Excess biological sludge processing and disposal have a significant impact on the energy balance and economics of wastewater treatment operations, and on receiving environments. Anaerobic digestion is probably the most widespread in-plant sludge processing method globally, since it stabilizes and converts biosolids organic matter into biogas, allowing partial recovery of their embedded chemical energy. A considerable number of studies concerning applicable techniques to improve biogas production, both in quantity and quality, include pre-treatment strategies to promote biosolids disintegration aimed at the release and solubilization of intracellular energy compounds, inorganic/biological amendments aimed at improving process performance, and sludge thermal pre-treatment.
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