Effects of Sulfates on Enhanced Biological Phosphorus Removal in Three Waste Water Treatment Plants

Kanazawa, Sui; Yamamoto-Ikemoto, Ryoko; Matsuura, Norihisa

doi:10.2965/jwet.18-066

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…In batch experiments, TP254 and TP258 remained stable under anoxic and abiotic-oxic conditions but degraded by microbial processes under oxic conditions, as was also demonstrated by their occurrence in the anoxic/oxic stages of the WWTP. Several studies documented the abundance and activity of sulfate-reducing bacteria in various stages of municipal WWTPs, including the pipelines of sewage systems, primary clarifiers, digested sludge, and aerated activated sludge units. − Therefore, sulfate-reducing bacteria might have contributed to the anaerobic biotransformation of SMX, as evidenced by the detection of anaerobic TPs in anoxic stages of the WWTP. Exceptionally high concentrations of TP258 in digested sludge samples could be attributed to ion enhancement caused by the complex matrix effect during measurement.…”

Section: Resultsmentioning

confidence: 99%

Sequential Anaerobic–Aerobic Treatment Enhances Sulfamethoxazole Removal: From Batch Cultures to Observations in a Large-Scale Wastewater Treatment Plant

Akay,

Ulrich,

Rocha

et al. 2024

Environ. Sci. Technol.

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Sulfamethoxazole (SMX) passes through conventional wastewater treatment plants (WWTPs) mainly unaltered. Under anoxic conditions sulfate-reducing bacteria can transform SMX but the fate of the transformation products (TPs) and their prevalence in WWTPs remain unknown. Here, we report the anaerobic formation and aerobic degradation of SMX TPs. SMX biotransformation was observed in nitrate-and sulfate-reducing enrichment cultures. We identified 10 SMX TPs predominantly showing alterations in the heterocyclic and N 4 -arylamine moieties. Abiotic oxic incubation of sulfate-reducing culture filtrates led to further degradation of the major anaerobic SMX TPs. Upon reinoculation under oxic conditions, all anaerobically formed TPs, including the secondary TPs, were degraded. In samples collected at different stages of a full-scale municipal WWTP, anaerobically formed SMX TPs were detected at high concentrations in the primary clarifier and digested sludge units, where anoxic conditions were prevalent. Contrarily, their concentrations were lower in oxic zones like the biological treatment and final effluent. Our results suggest that anaerobically formed TPs were eliminated in the aerobic treatment stages, consistent with our observations in batch biotransformation experiments. More generally, our findings highlight the significance of varying redox states determining the fate of SMX and its TPs in engineered environments.

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Section: Resultsmentioning

confidence: 99%

Sequential Anaerobic–Aerobic Treatment Enhances Sulfamethoxazole Removal: From Batch Cultures to Observations in a Large-Scale Wastewater Treatment Plant

Akay,

Ulrich,

Rocha

et al. 2024

Environ. Sci. Technol.

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“…This can be explained by the change in the number and diameters of holes after hydrothermal carbonization at a high temperature. The higher specific surface area indicated that ABC has a potentially strong phosphorus adsorption capacity [17,18].…”

Section: Morphological Characterization Of Abcmentioning

confidence: 99%

Effects of Alkali-Activated Algae Biochar on Soil Improvement after Phosphorus Absorption: Efficiency and Mechanism

Liu

2021

Sustainability

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Biochar is often used for the removal of phosphorus in wastewater. However, the improper treatment of adsorbed biochar might cause secondary pollution. In order to promote the recycling and harmless utilization of biochar with adsorbed phosphorus, a new modified biochar (ABC) was prepared from cyanobacteria in this study. The maximum adsorption capacity of ABC calculated from the Langmuir isotherm model was 38.17 mg·g−1. ABC was used to absorb phosphorus in wastewater, whose product (ABC/P) was used for soil improvement and soybean cultivation. The results showed that adding the proper amount of ABC/P could significantly increase the pH of the soil (from 6.52 ± 0.04 to 7.49 ± 0.08), organic matter content (from 34.02 ± 0.41 to 47.05 ± 0.14 g·kg−1), cation exchange capacity (from 3.01 ± 0.18 to 3.76 ± 0.07 cmol·kg−1), water-holding capacity (from 28.78 ± 0.34 to 35.03 ± 0.31%), effective phosphorus content, and total phosphorus content. Meanwhile, the soil alkaline phosphatase activity was improved. The plant height, root length, and fresh quality were promoted by planting soybeans in ABC/P-improved soil and were better than those of the control group. Therefore, ABC/P, as a new type of phosphorus fertilizer, has the potential for soil amendment for legume crops.

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Effects of P/C ratios on the growth, phosphorus removal and phosphorus recovery of a novel strain of highly efficient PAO

Pan

Zhang

et al. 2021

Process Biochemistry

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Effects of Sulfates on Enhanced Biological Phosphorus Removal in Three Waste Water Treatment Plants

Cited by 3 publications

References 25 publications

Sequential Anaerobic–Aerobic Treatment Enhances Sulfamethoxazole Removal: From Batch Cultures to Observations in a Large-Scale Wastewater Treatment Plant

Sequential Anaerobic–Aerobic Treatment Enhances Sulfamethoxazole Removal: From Batch Cultures to Observations in a Large-Scale Wastewater Treatment Plant

Effects of Alkali-Activated Algae Biochar on Soil Improvement after Phosphorus Absorption: Efficiency and Mechanism

Effects of P/C ratios on the growth, phosphorus removal and phosphorus recovery of a novel strain of highly efficient PAO

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