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Removal of metals from industrial wastewater and urban runoff by mineral and bio-based sorbents
- Source :
- Journal of environmental management. 209
- Publication Year :
- 2017
-
Abstract
- The study was performed to evaluate chemically modified biosorbents, hydrochloric acid treated peat (HCl-P) and citric acid treated sawdust (Citric acid-SD) for their metal removal capacity from dilute industrial wastewater and urban runoff and compare their efficiency with that of commercially available mineral sorbents (AQM PalPower M10 and AQM PalPower T5M5 magnetite). Batch and column experiments were conducted using real water samples to assess the sorbents' metal sorption capacity. AQM PalPower M10 (consisting mainly of magnesium, iron and silicon oxides) exhibited excellent Zn removal from both industrial wastewater and spiked runoff water samples even at low dosages (0.1 g/L and 0.05 g/L, respectively). The high degree of Zn removal was associated with the release of hydroxyl ions from the sorbent and subsequent precipitation of zinc hydroxide. The biosorbents removed Ni and Cr better than AQM PalPower M10 from industrial wastewater and performed well in removing Cr and Cu from spiked runoff water, although at higher dosages (0.3–0.75 g/L). The main mechanism of sorption by biosorbents was ion exchange. The sorbents required a short contact time to reach equilibrium (15–30 min) in both tested water samples. AQM PalPower T5M5 magnetite was the worst performing sorbent, leaching Zn into both industrial and runoff water and Ni into runoff water. Column tests revealed that both HCl-P and AQM PalPower M10 were able to remove metals, although some leaching was witnessed, especially As from AQM PalPower M10. The low hydraulic conductivity observed for HCl-P may restrict the possibilities of using such small particle size peat material in a filter-type passive system.
- Subjects :
- Environmental Engineering
Sorbent
Industrial Waste
Hydrochloric acid
02 engineering and technology
010501 environmental sciences
Management, Monitoring, Policy and Law
Wastewater
01 natural sciences
Water Purification
Industrial wastewater treatment
chemistry.chemical_compound
Metals, Heavy
Waste Management and Disposal
0105 earth and related environmental sciences
Urban runoff
Minerals
Ion exchange
Chemistry
Sorption
General Medicine
021001 nanoscience & nanotechnology
Leaching (chemistry)
visual_art
Environmental chemistry
visual_art.visual_art_medium
Sawdust
Adsorption
0210 nano-technology
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 10958630
- Volume :
- 209
- Database :
- OpenAIRE
- Journal :
- Journal of environmental management
- Accession number :
- edsair.doi.dedup.....df27482284aca89e11ca81213a5612d8