Related references
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Article
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Meiling Yu et al.
Summary: A pyrrhotite and sulfur-circulating packed bed reactor (PS-CPBR) was used to study the removal process and mechanism of NO3--N and PO43--P with different electron donors. The results showed that the removal performance of mixed electron donors (pyrrhotite and sulfur) was better than that of single electron donor (pyrrhotite). The optimum conditions for NO3--N and PO43--P removal in the PS-CPBR were HRT of 12 h and C/N of 0, with average removal efficiencies of 100% and 86.39% respectively. Sulfur in mixed electron donors promoted the dissolution of pyrrhotite and formation of polysulfide, enhancing the effectiveness of electron donors for NO3--N removal, while PO43--P was removed through FePO4 precipitation. Microbial and functional gene analyses indicated that different electron donors influenced microbial community abundance and denitrification functional genes. Mixed electron donors also increased protein content and reduced electron transfer resistance in biofilms.
Article
Environmental Sciences
Hong-Xu Bao et al.
Summary: Dosing sulfide in the sulfur-packed-bed (S0PB) can enhance denitrification efficiency, but the response of sulfur-metabolizing biofilm to different sulfide dosages has not been studied. This study conducted S0PB reactor experiments with increasing sulfide dosages, and found that the effluent nitrate decreased from 14.2 to 2.7 mg N/L with accelerated denitrification efficiency (k: 0.04 to 0.27) when sulfide dosage exceeded 0.9 kg/m3/d (optimum value), nitrite accumulated to 6.5 mg N/L. The study also observed that overdosing sulfide caused biofilm expulsion and significant decreases in biomass, live cell population, and ATP. The study confirms the ability of dosing sulfide to improve denitrification efficiency in S0PB but highlights the negative effects of exceeded dosing.
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Yi-Lu Sun et al.
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CHEMICAL ENGINEERING JOURNAL
(2023)
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Xue-Ning Zhang et al.
Summary: This study investigates the impact of low temperature on the performance of S-0-SAD biofilter and proposes the use of thiosulfate to enhance nitrate removal efficiency. By extending EBCT and reducing thiosulfate dosage simultaneously, the desired nitrate removal efficiency is achieved.
ENVIRONMENTAL RESEARCH
(2022)
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Hefei Shi et al.
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Hui Pan et al.
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(2022)
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(2022)
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Hong-Xu Bao et al.
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Environmental Sciences
Wen Hao et al.
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SCIENCE OF THE TOTAL ENVIRONMENT
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Gang Guo et al.
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Weidong Chen et al.
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ENVIRONMENT INTERNATIONAL
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Na Zhang et al.
Summary: Nitrate pollution is a major cause of eutrophication and ecological disruption. The element sulfur-based denitrification (ESDeN) has gained attention due to its non-carbon source dependence, low sludge yield, and cost-effectiveness. This study comprehensively investigated the shaping of ESDeN microbial communities under different temperature conditions and found that dissolved oxygen and temperature were important factors in shaping the microbial community structure.
ENVIRONMENTAL RESEARCH
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Akashdeep Singh Oberoi et al.
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Qi Zhao et al.
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Dandan Liang et al.
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Shu-Sen Wang et al.
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