http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Farshid Ghanbari,Masoumeh Khatebasreh,Mostafa Mahdavianpour,Ali Mashayekh-Salehi,Ehsan Aghayani,Kun-Yi Andrew Lin,Behnam Kazemi Noredinvand 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.7
Landfill leachate is classified as special wastewater because it contains a large amount of hazardous materials that can lead to the pollution of surface water, generating polluted water with landfill leachate (PWLL) with high organic load. This study investigated the treatment of PWLL by peroxymonosulfate (PMS)/O3/UV process. The effects of several operating parameters such as pH, reaction time, O3 and PMS dosage were investigated in detail. The results showed that PMS/O3/UV removed total organic carbon (TOC) (74%), color (98%), ammonia (93%), chemical oxygen demand (COD) (81%), and biochemical oxygen demand (BOD) (69%) in 75 min at optimal conditions (pH=7, PMS=5mM, O3=1.7 mg/min). According to the results, O3 and UV can well activate PMS and promote the ability of the process to remove TOC from PWLL. Adding ferrous ion to PMS/O3/UV increased the TOC removal efficiency (77%), but cobalt ions had no significant effect on the TOC removal. The elimination of TOC by the PMS/O3/UV process follows pseudo-first-order kinetic model with the reaction rate constant of 0.0203 min1. Compared to peroxone/ UV, PMS/O3/UV showed high yield in TOC, COD, color and ammonia removal. Thus the PMS/O3/UV process can be a new approach for treatment of polluted water in low volume.
Mojtaba Pourakbar,Farshid Ghanbari,Amir Hossein Cheshme Khavar,Maryam Khashij,Mohammad Mehralian,Ali Behnami,Mohammad Satari,Mostafa Mahdaviapour,Ali Oghazyan,Ehsan Aghayani 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.10
The present study comprehensively investigated the degradation of naproxen (NPX) using UV/O3/peroxymonosulfate (PMS), UV/O3, UV/PMS, and O3/PMS processes. The effects of various parameters such as PMS and ozone dosage, pH, and NPX concentration were investigated on process performance. Scavenging tests were conducted to identify the dominant radical species. The results under the optimal conditions show that the UV/O3/PMS process is highly efficient for NPX degradation within 30 min of reaction time. Synergy index was also calculated and it was found that ozonation of the UV/PMS process leads to higher removal efficiency and a synergy effect of about 25% was calculated. It was also found that after complete destruction of NPX molecules, 76.9% of TOC was also removed. The final degradation by-products was tracked and it was proved that hydroxylation and decarboxylation were the main pathways in NPX degradation in the UV/O3/PMS reactor. It was also proved that •OH was the main oxidizing agent in the UV/O3/PMS and accordingly the degradation mechanism of NPX was suggested. Cytotoxicity assessment of the process effluent indicated a noticeable reduction in the toxicity of the NPX-laden solution after treatment using UV/ O3/PMS process. Furthermore, cost analysis of the different oxidation processes for real wastewater indicated that UV/ O3/PMS is the most cost-effective process compared to that of other processes (112US$/m3). Accordingly, it can be put forth that the UV/O3/PMS process is a promising and reliable process for the degradation of naproxen.