Abstract
The objective of the present study is the treatment of pistachio processing industry wastewaters (PPIW) using the supercritical water oxidation method. The experiments were conducted within a 400–600°C temperature range and a 30–150 s reaction time range, while maintaining a constant pressure of 25 MPa and using an O2/COD ratio of 1:1. To observe the effects of the initial PPIW and O2 concentrations on the treatment efficiency, experiments were also conducted with O2/COD ratios ranging from 0.5 to 3, while maintaining a constant reaction temperature and time of 500°C and 60 s, respectively. The influence of reaction temperature, reaction time and O2/COD ratio on the total organic carbon (TOC) and total nitrogen (TN) contents of the liquid PPIW effluents were investigated. Treatment efficiencies up to 99.75% regarding TOC conversion and 78.72% regarding TN conversion were obtained in very short reaction times. Additionally, the kinetics of oxidation of PPIW was studied, and reaction rate expressions based on TOC and TN were proposed.
| Original language | English |
|---|---|
| Journal | Environmental Technology (United Kingdom) |
| DOIs | |
| Publication status | Accepted/In press - 2024 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2024 Informa UK Limited, trading as Taylor & Francis Group.
Keywords
- kinetics
- Pistachio processing
- supercritical water oxidation
- treatment
- wastewater
