Optimization of arsenic removal from an acid mine drainage in an anaerobic membrane bioreactor
| Autor: | Ece Yigit, Senem Teksoy Basaran, Adem Yurtsever, Erkan Sahinkaya |
|---|---|
| Přispěvatelé: | HKÜ, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Anaerobic membrane bioreactor
Sulfide 0208 environmental biotechnology Soil Science chemistry.chemical_element 02 engineering and technology Plant Science Orpiment 010501 environmental sciences 01 natural sciences law.invention Arsenic chemistry.chemical_compound Acid mine drainage law Bioreactor Sulfate Dissolution Filtration 0105 earth and related environmental sciences General Environmental Science chemistry.chemical_classification Chemistry 020801 environmental engineering visual_art visual_art.visual_art_medium Sulfate reduction Nuclear chemistry |
| Popis: | This study aims at optimizing the arsenic removal performance of a sulfidogenic anaerobic MBR treating acid mine drainage (AMD). The feed sulfate concentration was kept constant at 2,000 mg/L and ethanol concentration was decreased steadily from 1,500 mg COD/L to 500 mg COD/L. Metal concentrations were kept at 75 or 150 mg/L Fe, 25 mg/L Cu, 5 mg/L Zn, 5 mg/L Co, 5 mg/L Mn, 2.5 mg/L Ni and 2.5 mg/L As. High sulfide concentration led to dissolution of orpiment (As2S3) and low As removal efficiency. Later, decrease of sulfide concentration in the bioreactor resulted in increasing As removal efficiency over 99% due to formation of orpiment and co-precipitation of As with amorphous iron precipitates. Flux was increased up to around 10 Li(m(2)h) (LMH). It was concluded that heavy metals in the AMD behaved as a filtration aid and increased the sludge filterability, which was assessed by the regular analyses of supernatant filterability, specific resistance to filtration and capillary suction time. (C) 2020 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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