接触辉光放电等离子体降解苯酚过程中的毒性变化

Degradation and toxicity change of phenol in contact glow discharge electrolysis

苯酚是工业废水中一种常见的高毒性难降解有机污染物,研究其降解过程中的毒性变化对废水处理和生态环境保护具有重要意义.本文以小球藻为受试生物,测定了接触辉光放电等离子体(CGDE)降解苯酚过程中的毒性变化.CGDE降解1.0 g/L苯酚90 min,降解率为16.0%,降解过程中EC50从179.5降低至128.9而后逐渐升高到413.3 mg/L,表明毒性先小幅增大后逐渐降低.加入30.0 mg/L Fe2+后,苯酚降解率增加了32.7%,降解过程中EC50从179.5升至260.9后降低至234.3 mg/L,毒性先降低后略有增大.结果表明:Fe2+有利于苯酚的快速降解,但90min内不能有效降低CGDE降解苯酚过程中的毒性.

Abstract： Due to its highly toxicity and refractory degradation in industrial wastewater treatment, it is important to study the toxicity changes of phenol in the degradation process. This paper investigated the toxicity change during phenol degradation by contact glow discharge plasma （CGDE） with chlorella vulgaris as testing organism. The degradation rate of 1.0 g/L phenol after 90 min CGDE treatment is 16.0%, and ECs0 reduced from 179.5 to 128.9 and then gradually increase to 413.3 mg/L, showed that the toxicity first slightly increases and then gradually reduce. With 30.0 mg/L Fe^2＋ in presence of solution, phenol degradation rate increased to 32.7% and ECs0 rose from 179.5 to 260.9 and then down to 234.3 mg/L, the toxicity reduced and then slightly increases. The results indicated that Fe^2＋ was of great benefit to the rapid degradation of the phenol, but 90 min CGDE treatment still could not effectively reduce the toxicity of phenol solution.