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Simultaneous removal of nitrate and chromate in groundwater by a spiral fiber based biofilm reactor.
- Source :
-
Bioresource technology [Bioresour Technol] 2017 May; Vol. 232, pp. 278-284. Date of Electronic Publication: 2017 Feb 11. - Publication Year :
- 2017
-
Abstract
- A spiral fiber based biofilm reactor was developed to remove nitrate and chromate simultaneously. The denitrification and Cr(VI) removal efficiency was evaluated with synthetic groundwater (NO <subscript>3</subscript> <superscript>-</superscript> -N=50mg/L) under different Cr(VI) concentrations (0-1.0mg/L), carbon nitrogen ratios (C/N) (0.8-1.2), hydraulic retention times (HRT) (2-16h) and initial pHs (4-10). Nitrate and Cr(VI) were completely removed without nitrite accumulation when the Cr(VI) concentration was lower than 0.4mg/L. As Cr(VI) up to 1.0mg/L, the system was obviously inhibited, but it recovered rapidly within 6days due to the strong adaption and domestication of microorganisms in the biofilm reactor. The results demonstrated that high removal efficiency of nitrate (≥99%) and Cr(VI) (≥95%) were achieved at lower C/N=0.9, HRT=8h, initial pH=7, and Cr(VI)=1.0mg/L. The technology proposed in present study can be alternative for simultaneous removal of co-contaminants in groundwater.<br /> (Copyright © 2017 Elsevier Ltd. All rights reserved.)
- Subjects :
- Carbon chemistry
Carbon isolation & purification
Carbon pharmacokinetics
Chromates pharmacokinetics
Denitrification
Nitrates pharmacokinetics
Nitrites isolation & purification
Nitrites pharmacokinetics
Nitrogen chemistry
Nitrogen isolation & purification
Nitrogen pharmacokinetics
Bioreactors
Chromates isolation & purification
Groundwater chemistry
Micropore Filters
Nitrates isolation & purification
Water Purification methods
Subjects
Details
- Language :
- English
- ISSN :
- 1873-2976
- Volume :
- 232
- Database :
- MEDLINE
- Journal :
- Bioresource technology
- Publication Type :
- Academic Journal
- Accession number :
- 28237899
- Full Text :
- https://doi.org/10.1016/j.biortech.2017.01.076