Response mechanisms of microalgal-bacterial granular sludge to different loading strategies of copper oxide nanoparticles
This study investigated the effects of copper oxide nanoparticles (CuO NPs) at concentrations of 1–50 mg/L on the microalgal-bacterial granular sludge (MBGS) wastewater treatment process, comparing two nanoparticle addition methods: shock-load (SL) and stepwise (SW) increases. The results demonstrat...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2025
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| Sorozat: | ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
89 |
| Tárgyszavak: | |
| doi: | 10.1016/j.algal.2025.104099 |
| mtmt: | 36136994 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/36727 |
| Tartalmi kivonat: | This study investigated the effects of copper oxide nanoparticles (CuO NPs) at concentrations of 1–50 mg/L on the microalgal-bacterial granular sludge (MBGS) wastewater treatment process, comparing two nanoparticle addition methods: shock-load (SL) and stepwise (SW) increases. The results demonstrated that the chemical oxygen demand (COD) and ammonia‑nitrogen (NH3-N) removal were more sensitive in the reactor with shock-load (RSL), phosphate concentrations were higher in the effluent from the reactor with stepwise increases (RSW). Accumulation of nitrate‑nitrogen was observed only in the SW method at CuO NP concentrations ≥20 mg/L, likely due to the nanoparticles becoming entrapped within the granule interiors, as evidenced by scanning electron microscopy coupled with energy-dispersive X-ray (SEM-EDX) mapping. Although total EPS levels were highest in both reactors at 20 mg/L CuO NP dosage, the levels were significantly higher in the RSW sludge (191.1 mg/g MLVSS in RSL vs. 218.3 mg/g MLVSS in RSW), primarily due to the long-term exposure leading to increased loosely-bound EPS (LB-EPS) content (75.7 mg/g MLVSS in RSL vs. 102.9 mg/g MLVSS in RSW). Furthermore, CuO NPs interacted with EPS, binding to Nsingle bondH, Csingle bondN, Cdouble bondO, and C-O-C groups in protein (PN) and polysaccharide (PS) structures. |
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| Terjedelem/Fizikai jellemzők: | 9 |
| ISSN: | 2211-9264 |