Department of Chemistry, Faculty of Arts and Science, Siirt University, Kezer Campus, Siirt, Turkey.
Siirt Municipality Directorate of Water and Sewerage Affairs, Siirt, Turkey.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2022;57(3):183-192. doi: 10.1080/10934529.2022.2046987. Epub 2022 Mar 2.
This study aims to apply an efficient and environmentally friendly subcritical water oxidation (SWO) method for the treatment of pistachio processing plant wastewater (PPPW). The effects of temperature (336.2-399.8 K), the concentration of HO (0.08-0.92 M) and treatment time (6.4-73.6 min) on the oxidation of PPPW were investigated using the SWO method and experimental parameters were optimized using the response surface method. While the highest chemical oxygen demand (COD) removal was obtained as 53.8% in 73.6 min at 373 K using 0.5 M of HO, the highest obtained total phenol (TP) and color removals were 92.80%, and 99.6%, respectively, in 20 min at 373 K using 0.75 M of HO. values of COD, TP and color removal models were 0.9694, 0.9868 and 0.9649, respectively, and values of the models were 35.24, 82.86 and 30.54, in the same order. In the vast majority of the experimental samples, the concentrations of nitrate, total phosphate, total nitrogen and suspended solids were found to be decreased while the nitrite concentration was increased after the SWO process. The effectiveness of SWO in water recovery from PPPW was demonstrated by the high, COD, TP and color removal values obtained.
本研究旨在应用高效、环保的亚临界水氧化（SWO）方法处理开心果加工厂废水（PPPW）。采用 SWO 法考察了温度（336.2-399.8 K）、HO 浓度（0.08-0.92 M）和处理时间（6.4-73.6 min）对 PPPW 氧化的影响，并采用响应面法对实验参数进行了优化。当在 373 K 下使用 0.5 M 的 HO 处理 73.6 min 时，COD 去除率最高为 53.8%，而在 373 K 下使用 0.75 M 的 HO 处理 20 min 时，TP 和色度的去除率最高分别为 92.80%和 99.6%。COD、TP 和色度去除模型的值分别为 0.9694、0.9868 和 0.9649，模型的 值分别为 35.24、82.86 和 30.54。在绝大多数实验样品中，SWO 处理后，硝酸盐、总磷酸盐、总氮和悬浮物的浓度降低，亚硝酸盐浓度升高。SWO 对 PPPW 中水分的回收效果显著，COD、TP 和色度去除率均较高。
