Process Optimization of Electrochemical Oxidation of Ammonia to Nitrogen for Actual Dyeing Wastewater Treatment

Jiachao Yao, Yu Mei, Guanghua Xia, Yin Lu, Dongmei Xu, Nabo Sun, Jiade Wang and Jun Chen
Additional contact information
Jiachao Yao: College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
Yu Mei: College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
Guanghua Xia: College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
Yin Lu: College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
Dongmei Xu: College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
Nabo Sun: College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
Jiade Wang: College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
Jun Chen: College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China

IJERPH, 2019, vol. 16, issue 16, 1-13

Abstract: To mitigate the potential environmental risks caused by nitrogen compounds from industrial wastewater, residual ammonia after conventional wastewater treatment should be further eliminated. In this work, an electrochemical oxidation process for converting ammonia to nitrogen in actual dyeing wastewater was investigated. The effects of the main operating parameters, including initial pH value, applied current density, NaCl concentration, and flow, were investigated on ammonia removal and products distribution. Experimental results indicated that, under optimal conditions of an initial pH value of 8.3, applied current density of 20 mA cm −2 , NaCl concentration of 1.0 g L −1 , and flow of 300 mL min −1 , the ammonia could be completely removed with N 2 selectivity of 88.3% in 60 min electrolysis. A kinetics investigation using a pseudo-first-order model provided a precise description of ammonia removal during the electro-oxidation process. Experimental functions for describing the relationships between kinetic constants of ammonia removal and main operating parameters were also discussed. Additionally, the mechanisms and economic evaluation of ammonia oxidation were conducted. All these results clearly proved that this electro-oxidation process could efficiently remove ammonia and achieve high N 2 selectivity.

Keywords: electro-oxidation; ammonia; N 2 selectivity; process optimization; kinetics (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1660-4601/16/16/2931/pdf (application/pdf)
https://www.mdpi.com/1660-4601/16/16/2931/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:16:y:2019:i:16:p:2931-:d:257894

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().