Experimental and computational investigation of cold atmospheric plasma/visible-light/N-TiO2 in treatment of synthetic and real wastewaters

IF 4.5 3区工程技术 Q1 WATER RESOURCES

Water Resources and Industry Pub Date : 2024-12-24 DOI:10.1016/j.wri.2024.100276

Mohsen Sheydaei, Parisa Moharramkhani, Baharak Ayoubi-Feiz, Farhad Khodabandeloo

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Abstract

Cold atmospheric plasma and visible-light photocatalysis (CAPVP) is considered as an effective advanced oxidation process. Experimental and computational investigation of CAPVP application for treatment of synthetic and industrial wastewaters was conducted for the first time in this work. N-TiO₂ as a visible-light photocatalyst was synthesized and characterized. The CAPVP reactor was developed and its performance in synthetic (cefixime) and real wastewater (Eshtehard Industrial Zone, Iran) was investigated. The effect of catalyst dosage, discharge voltage, inlet gas, visible-light power, and electrode distance from water surface was investigated on the cefixime degradation efficiency. The combined CAPVP with catalyst dosage = 1 g L⁻¹, air flow rate = 5 L min^-1 under visible-light power of 36 W with discharge voltage = 35 kV and the electrode-water surface distance of 5 mm caused about 95 % cefixime degradation after 20 min. A three-layered feed forward back propagation artificial neural network was developed for analysis of different variables influence on the CAPVP process. Findings showed that the catalyst dosage and discharge voltage had the highest effect on the degradation among the investigated variables. Also, the comparative experiments showed that the efficiency of the CAPVP was higher than that of one stage photocatalysis and plasma processes and showed a synergistic coefficient of 3.06. Furthermore, the CAPVP was used to treat the effluent of the real industrial wastewater and the effect of the catalyst dosage and discharge voltage was investigated on treatment efficiency. The results indicated that the combined process for 240 min reduced the COD of the effluent of Eshtehard Industrial Zone up to 95 %.

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低温大气等离子体/可见光/N-TiO2处理合成废水和实际废水的实验和计算研究

低温大气等离子体-可见光催化（CAPVP）是一种有效的高级氧化工艺。本文首次对CAPVP在合成废水和工业废水处理中的应用进行了实验和计算研究。合成了N-TiO2可见光催化剂并对其进行了表征。研制了CAPVP反应器，并对其在合成（头孢克肟）和实际废水（伊朗Eshtehard工业区）中的性能进行了研究。考察了催化剂用量、放电电压、进气口、可见光功率、电极与水面距离等因素对头孢克肟降解效率的影响。在可见光功率为36 W、放电电压为35 kV、电极-水面距离为5 mm、催化剂用量为1 g L−1、空气流速为5 L min-1的条件下，头孢克肟在20 min后降解率约为95%。建立了三层前馈反传播人工神经网络，分析了不同变量对CAPVP过程的影响。结果表明，催化剂用量和放电电压对降解的影响最大。对比实验表明，该工艺效率高于单阶段光催化和等离子体工艺，协同系数为3.06。在此基础上，采用CAPVP处理实际工业废水出水，考察了催化剂用量和放电电压对处理效果的影响。结果表明，联合处理240 min可使埃什特哈德工业区出水COD降低95%以上。

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来源期刊

Water Resources and Industry Social Sciences-Geography, Planning and Development

CiteScore

8.10

自引率

5.90%

发文量

审稿时长

75 days

期刊介绍： Water Resources and Industry moves research to innovation by focusing on the role industry plays in the exploitation, management and treatment of water resources. Different industries use radically different water resources in their production processes, while they produce, treat and dispose a wide variety of wastewater qualities. Depending on the geographical location of the facilities, the impact on the local resources will vary, pre-empting the applicability of one single approach. The aims and scope of the journal include: -Industrial water footprint assessment - an evaluation of tools and methodologies -What constitutes good corporate governance and policy and how to evaluate water-related risk -What constitutes good stakeholder collaboration and engagement -New technologies enabling companies to better manage water resources -Integration of water and energy and of water treatment and production processes in industry