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 |
|---|---|
| Pages (from-to) | 315-324 |
| Number of pages | 10 |
| Journal | Environmental Technology (United Kingdom) |
| Volume | 46 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2025 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2024 Informa UK Limited, trading as Taylor & Francis Group.
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 6 Clean Water and Sanitation -
SDG 9 Industry, Innovation, and Infrastructure
Keywords
- Pistachio processing
- kinetics
- supercritical water oxidation
- treatment
- wastewater
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