Needle electrode design of pulsed high voltage discharge reactor for performance enhancement of 4-chlorophenol degradation in highly conductive solution.

Yanyu Su, Shuai Liu, Chunfeng Zhao, Xiaojing Yang, Lei Huang, Xue Peng, Deqi Liu

Chemosphere 2021 Mar

filter terms:

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. Copyright © 2020 Elsevier Ltd. All rights reserved.

Citation

Yanyu Su, Shuai Liu, Chunfeng Zhao, Xiaojing Yang, Lei Huang, Xue Peng, Deqi Liu. Needle electrode design of pulsed high voltage discharge reactor for performance enhancement of 4-chlorophenol degradation in highly conductive solution. Chemosphere. 2021 Mar;266:129203