Needle electrode design of pulsed high voltage discharge reactor for performance enhancement of 4-chlorophenol degradation in highly conductive solution
| Autor: | Deqi Liu, Lei Huang, Chunfeng Zhao, Shuai Liu, Xue Peng, Yanyu Su, Xiaojing Yang |
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| Rok vydání: | 2020 |
| Předmět: |
Needle electrode
Environmental Engineering Materials science Health Toxicology and Mutagenesis 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Conductivity 01 natural sciences Immersion (virtual reality) Environmental Chemistry Composite material Electrical conductor Electrodes NOx 0105 earth and related environmental sciences Public Health Environmental and Occupational Health Electric Conductivity High voltage General Medicine General Chemistry Pollution 020801 environmental engineering Electrode Performance enhancement Water Pollutants Chemical Chlorophenols |
| Zdroj: | Chemosphere. 266 |
| ISSN: | 1879-1298 |
| Popis: | In this paper, a pulsed high voltage discharge (PHVD) reactor composed of a new type of high-voltage (HV) needle electrode and mesh grounding electrode was utilized to degrade 4-chlorophenol (4-CP). The effect of needle installation position on 4-CP degradation efficiency in solution systems with different conductivities was studied. It is verified that the recessed- and flush-tip structures could effectively overcome the main technical problem of protruded-tip HV electrode, which is that how to maintain stable discharge in the solution with high conductivity. When the conductivity of solution surpassed 116 μS cm−1, the recessed-tip and flush-tip electrodes possessed higher energy efficiency than that of the protruded-tip electrode. Within 40 min, the flush-tip electrode had the highest 4-CP removal rate (86.2%) in pure water, which could further increased to 95.8% via increasing immersion depth of net electrode. Comprehensively considering the experimental results of 4-CP removal rate, discharge characteristic and tail gas emission, it is indicated that the optimal installation positions were 0-F and 5-R. Meanwhile, the increase in immersion depth could reduce the generation of tail gas (e.g. O3 and NOX) obviously. The possible mechanism of 4-CP degradation via PHVD was proposed. |
| Databáze: | OpenAIRE |
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