In order to improve 4-CP degradation efficiency, a novel gas-liquid hybrid discharge （liD） reactor was developed. Removal of 4-CP with spark-spark discharge （SSD） was higher than that with spark-corona discharge ...In order to improve 4-CP degradation efficiency, a novel gas-liquid hybrid discharge （liD） reactor was developed. Removal of 4-CP with spark-spark discharge （SSD） was higher than that with spark-corona discharge （SCD）. Amount of H2O2 and O3 produced with SSD were larger than that with SCD. OH formation was increased by the combination of H2O2 and O3. The contribution of ·OH （38 % formed by O3 conversion） oxidation on removal of 4-CP accounted for nearly 60 %. The other effects of ultraviolet radiation, intense shock waves and pyrolysis, played partial roles in about 40 % of removal rate.展开更多
A new process for removing the pollutants in aqueous solution-activated alumina bed in pulsed high-voltage electric field was investigated for the removal of phenol under different conditions. The experimental results...A new process for removing the pollutants in aqueous solution-activated alumina bed in pulsed high-voltage electric field was investigated for the removal of phenol under different conditions. The experimental results indicated the increase in removal rate with increasing applied voltage, increasing pH value of the solution, aeration, and adding Fe^2＋. The removal rate of phenol could reach 72.1% when air aeration flow rate was 1200 ml/min, and 88.2% when 0.05 mmol/L Fe^2＋ was added into the solution under the conditions of applied voltage 25 kV, initial phenol concentration of 5 mg/L, and initial pH value 5.5. The addition of sodium carbonate reduced the phenol removal rate. In the pulsed high-voltage electric field, local discharge occurred at the surface of activated alumina, which promoted phenol degradation in the thin water film. At the same time, the space-time distribution of gas-liquid phases was more uniform and the contact areas of the activated species generated from the discharge and the pollutant molecules were much wider due to the effect of the activated alumina bed. The synthetical effects of the pulsed high-voltage electric field and the activated alumina particles accelerated phenol degradation.展开更多
液相高压脉冲放电产生的强氧化性活性物质和紫外光、冲击波等可以有效地用于水处理。为此,以扁藻作为处理目标物,采用多喷嘴–板式水处理装置和气液两相纳秒负脉冲放电形式,分析了反应器电气特性、不同放电参数对扁藻杀灭率的影响。实...液相高压脉冲放电产生的强氧化性活性物质和紫外光、冲击波等可以有效地用于水处理。为此,以扁藻作为处理目标物,采用多喷嘴–板式水处理装置和气液两相纳秒负脉冲放电形式,分析了反应器电气特性、不同放电参数对扁藻杀灭率的影响。实验结果表明,随着脉冲峰值电压的增大,单脉冲能量随之增加;能量效率先增后减,在脉冲峰值电压为-7.6 k V时出现拐点,此时能量效率为34.1%。扁藻的杀灭率随着脉冲峰值电压、脉冲重复频率、放电处理时间的增加而增大;随着鼓气速率的增大,扁藻的杀灭率呈现先增后减的趋势。当脉冲峰值电压为-9.4 k V、鼓气速率为70 m L/min、循环速率为380 m L/min、放电处理时间为30 min、脉冲重复频率为70 Hz时,扁藻的杀灭率为100%。展开更多
A double-chamber gas-liquid phase DBD reactor(GLDR), consisting of a gas-phase discharge chamber and a gas-liquid discharge chamber in series, was designed to enhance the degradation of benzene and the emission of NOx...A double-chamber gas-liquid phase DBD reactor(GLDR), consisting of a gas-phase discharge chamber and a gas-liquid discharge chamber in series, was designed to enhance the degradation of benzene and the emission of NOx. The performance of the GLDR on discharge characteristics,reactive species production and benzene degradation was compared to that of the single-chamber gas phase DBD reactor(GPDR). The effects of discharge gap, applied voltage, initial benzene concentration, gas flow rate and solution conductivity on the degradation and energy yield of benzene in the GLDR were investigated. The GLDR presents a higher discharge power, higher benzene degradation and higher energy yield than that of the GPDR. NO2 emission was remarkably inhibited in the GLDR, possibly due to the dissolution of NO2 in water. The benzene degradation efficiency increased with the applied voltage, but decreased with the initial concentration, gas flow rate, and gas discharge gap, while the solution conductivity presented less influence on benzene degradation. The benzene degradation efficiency and the energy yield reached 61.11% and 1.45 g k Wh-1 at 4 mm total gas discharge gap, 15 k V applied voltage, 200 ppm benzene concentration,0.2 L min-1 gas flow rate and 721 μS cm-1 water conductivity. The intermediates and byproducts during benzene degradation were detected by FT-IR, GC-MS and LC-MS primarily, and phenols,COx, and other aromatic substitutes, O3, NOx, etc, were determined as the main intermediates.According to these detected byproducts, a possible benzene degradation mechanism was proposed.展开更多
基金This work is financial support from National Key Natural Science Foundation of China （No.20336030） Distinguished Youth Foundation of Zhejiang Province （RC 02060）.
文摘In order to improve 4-CP degradation efficiency, a novel gas-liquid hybrid discharge （liD） reactor was developed. Removal of 4-CP with spark-spark discharge （SSD） was higher than that with spark-corona discharge （SCD）. Amount of H2O2 and O3 produced with SSD were larger than that with SCD. OH formation was increased by the combination of H2O2 and O3. The contribution of ·OH （38 % formed by O3 conversion） oxidation on removal of 4-CP accounted for nearly 60 %. The other effects of ultraviolet radiation, intense shock waves and pyrolysis, played partial roles in about 40 % of removal rate.
基金Project supported by the Technology Innovation Project of University (No. 705013)
文摘A new process for removing the pollutants in aqueous solution-activated alumina bed in pulsed high-voltage electric field was investigated for the removal of phenol under different conditions. The experimental results indicated the increase in removal rate with increasing applied voltage, increasing pH value of the solution, aeration, and adding Fe^2＋. The removal rate of phenol could reach 72.1% when air aeration flow rate was 1200 ml/min, and 88.2% when 0.05 mmol/L Fe^2＋ was added into the solution under the conditions of applied voltage 25 kV, initial phenol concentration of 5 mg/L, and initial pH value 5.5. The addition of sodium carbonate reduced the phenol removal rate. In the pulsed high-voltage electric field, local discharge occurred at the surface of activated alumina, which promoted phenol degradation in the thin water film. At the same time, the space-time distribution of gas-liquid phases was more uniform and the contact areas of the activated species generated from the discharge and the pollutant molecules were much wider due to the effect of the activated alumina bed. The synthetical effects of the pulsed high-voltage electric field and the activated alumina particles accelerated phenol degradation.
文摘液相高压脉冲放电产生的强氧化性活性物质和紫外光、冲击波等可以有效地用于水处理。为此,以扁藻作为处理目标物,采用多喷嘴–板式水处理装置和气液两相纳秒负脉冲放电形式,分析了反应器电气特性、不同放电参数对扁藻杀灭率的影响。实验结果表明,随着脉冲峰值电压的增大,单脉冲能量随之增加;能量效率先增后减,在脉冲峰值电压为-7.6 k V时出现拐点,此时能量效率为34.1%。扁藻的杀灭率随着脉冲峰值电压、脉冲重复频率、放电处理时间的增加而增大;随着鼓气速率的增大,扁藻的杀灭率呈现先增后减的趋势。当脉冲峰值电压为-9.4 k V、鼓气速率为70 m L/min、循环速率为380 m L/min、放电处理时间为30 min、脉冲重复频率为70 Hz时,扁藻的杀灭率为100%。
基金support of National Natural Science Foundation of China (No. 21577011)
文摘A double-chamber gas-liquid phase DBD reactor(GLDR), consisting of a gas-phase discharge chamber and a gas-liquid discharge chamber in series, was designed to enhance the degradation of benzene and the emission of NOx. The performance of the GLDR on discharge characteristics,reactive species production and benzene degradation was compared to that of the single-chamber gas phase DBD reactor(GPDR). The effects of discharge gap, applied voltage, initial benzene concentration, gas flow rate and solution conductivity on the degradation and energy yield of benzene in the GLDR were investigated. The GLDR presents a higher discharge power, higher benzene degradation and higher energy yield than that of the GPDR. NO2 emission was remarkably inhibited in the GLDR, possibly due to the dissolution of NO2 in water. The benzene degradation efficiency increased with the applied voltage, but decreased with the initial concentration, gas flow rate, and gas discharge gap, while the solution conductivity presented less influence on benzene degradation. The benzene degradation efficiency and the energy yield reached 61.11% and 1.45 g k Wh-1 at 4 mm total gas discharge gap, 15 k V applied voltage, 200 ppm benzene concentration,0.2 L min-1 gas flow rate and 721 μS cm-1 water conductivity. The intermediates and byproducts during benzene degradation were detected by FT-IR, GC-MS and LC-MS primarily, and phenols,COx, and other aromatic substitutes, O3, NOx, etc, were determined as the main intermediates.According to these detected byproducts, a possible benzene degradation mechanism was proposed.
