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Depth treatment of coal-chemical engineering wastewater by a cost-effective sequential heterogeneous Fenton and biodegradation process.
- Source :
-
Environmental science and pollution research international [Environ Sci Pollut Res Int] 2018 May; Vol. 25 (13), pp. 13118-13126. Date of Electronic Publication: 2018 Feb 27. - Publication Year :
- 2018
-
Abstract
- In this study, a sequential Fe <superscript>0</superscript> /H <subscript>2</subscript> O <subscript>2</subscript> reaction and biological process was employed as a low-cost depth treatment method to remove recalcitrant compounds from coal-chemical engineering wastewater after regular biological treatment. First of all, a chemical oxygen demand (COD) and color removal efficiency of 66 and 63% was achieved at initial pH of 6.8, 25 mmol L <superscript>-1</superscript> of H <subscript>2</subscript> O <subscript>2</subscript> , and 2 g L <superscript>-1</superscript> of Fe <superscript>0</superscript> in the Fe <superscript>0</superscript> /H <subscript>2</subscript> O <subscript>2</subscript> reaction. According to the gas chromatography-mass spectrometer (GC-MS) and gas chromatography-flame ionization detector (GC-FID) analysis, the recalcitrant compounds were effectively decomposed into short-chain organic acids such as acetic, propionic, and butyric acids. Although these acids were resistant to the Fe <superscript>0</superscript> /H <subscript>2</subscript> O <subscript>2</subscript> reaction, they were effectively eliminated in the sequential air lift reactor (ALR) at a hydraulic retention time (HRT) of 2 h, resulting in a further decrease of COD and color from 120 to 51 mg L <superscript>-1</superscript> and from 70 to 38 times, respectively. A low operational cost of 0.35 $ m <superscript>-3</superscript> was achieved because pH adjustment and iron-containing sludge disposal could be avoided since a total COD and color removal efficiency of 85 and 79% could be achieved at an original pH of 6.8 by the above sequential process with a ferric ion concentration below 0.8 mg L <superscript>-1</superscript> after the Fe <superscript>0</superscript> /H <subscript>2</subscript> O <subscript>2</subscript> reaction. It indicated that the above sequential process is a promising and cost-effective method for the depth treatment of coal-chemical engineering wastewaters to satisfy discharge requirements.
- Subjects :
- Biodegradation, Environmental
Biological Oxygen Demand Analysis
Cost-Benefit Analysis
Oxidation-Reduction
Sewage analysis
Water Purification economics
Chemical Engineering
Coal analysis
Hydrogen Peroxide chemistry
Iron chemistry
Wastewater chemistry
Water Pollutants, Chemical analysis
Water Purification methods
Subjects
Details
- Language :
- English
- ISSN :
- 1614-7499
- Volume :
- 25
- Issue :
- 13
- Database :
- MEDLINE
- Journal :
- Environmental science and pollution research international
- Publication Type :
- Academic Journal
- Accession number :
- 29488201
- Full Text :
- https://doi.org/10.1007/s11356-018-1571-8