等离子体废水处理装置能量利用效率的评价方法

等离子体废水处理装置类型多样,对不同装置处理废水的性能加以比较有利于促进反应装置的进一步开发与完善. 目前广泛采用的等离子体水处理装置的评价指标为G₅₀(能量利用效率)和E_TOC(去除TOC的能量利用效率),通过对二者的特点及其之间的关系研究发现,现有指标在评价等离子体水处理装置能效方面存在对反应影响因素考虑不全面、反应目标物质不明确、评价参数选择不尽合理等缺陷；并且2种评价指标相关性差(R2＜0.1),无法准确衡量装置效能. 在综合考虑污染物类型、处理时间等条件下,提出了以E_T(标准能量利用效率)作为考查等离子体水处理装置能量利用效率的指标,明确了以TOC(建议以苯酚作为目标污染物)作为基本参数,以TOC降解50%时,单位输入能耗可降解TOC的量表征装置的处理性能,以便在同一标准下对不同的等离子体废水处理装置的性能进行比较. 

Method of Evaluating the Energy Efficiency of Plasma Wastewater Treatment Reactors

Treating wastewater using electrical discharge plasma has attracted a great attention in research areas. Due to the diversity of plasma wastewater treatment reactors, evaluation indicators are needed to compare the efficiency of different reactors. This would be a great impetus to further development and improvement of plasma wastewater treatment reactors. By analyzing two widely used indicators, G₅₀ (energy efficiency) and E_TOC (TOC removal energy efficiency), and their relationship, it was revealed that although they could represent the efficiency of wastewater treatment reactors to some extent, short comings still existed in these two factors, such as the lack of limiting reaction conditions, the uncertainty of target pollutants and the imperfection in selecting evaluation parameters. Besides, the correlation between the two factors was low (R2<0.1), indicating that only one of them was not sufficient to express the reactor efficiency. Thus, considering the type of target pollutants and treatment time, an evaluation indicator, E_T, was proposed to evaluate the energy efficiency of plasma wastewater treatment reactors. This indicator was based on the removal rate of TOC per input power when 50% TOC was degraded (phenol was suggested as the target pollutant), and thus provided a more convenient way to compare the energy efficiencies of different reactors in the same condition.