BackgroundElectrochemical oxidation has attracted wide attention in wastewater treatment because of its strong oxidation performance and ease of control. This work investigated the feasibility of electrochemical treat...
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BackgroundElectrochemical oxidation has attracted wide attention in wastewater treatment because of its strong oxidation performance and ease of control. This work investigated the feasibility of electrochemical treatment using a Ti/RuO2-IrO2 anode as an advanced treatment of coking wastewater. The influential operating factors including current density (9.6-108.2mAcm(-2)) and electrode gap (0.5-2.5cm) were evaluated. ResultsThe current density and electrodes gap had significant effects on COD and NH4+-N removal and the energy consumption. The degradation of COD and NH4+-N followed pseudo-first-order kinetics. In most experiments, high levels of NH4+-N removal (NH4+-N removal ratio>95%) was achieved along with moderate mineralization (COD removal ratio: 60-80%). COD (178.0-285.0mgL(-1)) and NH4+-N (55.0-76.0mgL(-1)) were degraded by 62% and 96%, respectively, at the optimum conditions (electrode gap: 0.5cm, current density: 15.6mAcm(-2)) after 60min treatment. Under this optimal condition, the corresponding energy consumption was 8.60 kWh m(-3) for effluent meeting the discharge standards. Furthermore, gas chromatography-mass spectrometry (GC-MS) analysis indicated that this technique could be employed to eliminate bio-refractory and toxic compounds such as phenanthrene, indole, quinoline and pyrimidine in coking wastewater. ConclusionTi/RuO2-IrO2 anode systems were confirmed to be effective in advanced treatment of biologically pretreated coking wastewater. (c) 2012 Society of Chemical Industry
The great amount of resource consumption and the depletion of metal rich primary ores are the main driving forces to develop and utilize the valuable resource hiding in urban mines. Although urban mining possesses sev...
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ISBN:
(纸本)9783037857427
The great amount of resource consumption and the depletion of metal rich primary ores are the main driving forces to develop and utilize the valuable resource hiding in urban mines. Although urban mining possesses several advantages such as lower energy consumption, less cost and easier to develop and less pollution than conventional primary mining, the various wastes generated in the urban mining become a burden for the society because of poor organization production and the implementation of the strict environmental regulations. This paper investigated the environmental problems and the wastes characterization in development and utilization by taking secondary copper as an example. The main pollutants discharged in secondary copper production were exhaust gas containing POPs and metals, waste water of heavy metals and acid water, and the residues of melting and electrolytic plants. The toxic pollutants like heavy metals asked for appropriate dumping and disposal to prevent the damage to the environment.
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