A direct-current air plasma jet operated underwater presents three stable modes including an intermittently-pulsed discharge, a periodically-pulsed discharge and a continuous discharge with increasing the power voltag...A direct-current air plasma jet operated underwater presents three stable modes including an intermittently-pulsed discharge, a periodically-pulsed discharge and a continuous discharge with increasing the power voltage. The three discharge modes have different appearances for the plasma plumes. Moreover, gap voltage-current characteristics indicate that the continuous discharge is in a normal glow regime. Spectral lines from reactive species（OH, N2, N2^＋, Hα,and O） have been revealed in the emission spectrum of the plasma jet operated underwater.Spectral intensities emitted from OH radical and oxygen atom increase with increasing the power voltage or the gas flow rate, indicating that reactive species are abundant. These reactive species cause the degradation of the methylene blue dye in solution. Effects of the experimental parameters such as the power voltage, the gas flow rate and the treatment time are investigated on the degradation efficiency. Results indicate that the degradation efficiency increases with increasing the power voltage, the gas flow rate or the treatment time. Compared with degradation in the intermittently-pulsed mode or the periodically-pulsed one, it is more efficient in the continuous mode, reaching 98% after 21 min treatment.展开更多
目的考查电-生物耦合法的强化降解性能.在生物水解反应器中添加微电场,以期能够促进水解,提高处理效果.方法在水解反应器中施加铁皮阳极,石墨柱阴极的微电场,形成电-生物耦合水解反应器,分别用电-生物耦合水解-好氧接触氧化法和生物水解...目的考查电-生物耦合法的强化降解性能.在生物水解反应器中添加微电场,以期能够促进水解,提高处理效果.方法在水解反应器中施加铁皮阳极,石墨柱阴极的微电场,形成电-生物耦合水解反应器,分别用电-生物耦合水解-好氧接触氧化法和生物水解-好氧接触氧化法处理直接耐晒蓝B2RL染料废水.停留时间：水解12 h,接触氧化7.95 h.电生物水解反应器采用电流密度依次为0.024、0.048、0.072、0.084和0.096 m A·cm^-2.结果电-生物系统对染料质量浓度、色度和CODCr的去除效果优于生物系统,对氨氮的去除效果则较生物系统差,且氨氮效果的差距随电流密度的增加而缩小.在电流密度为0.096 m A·cm^-2时,电-生物耦合工艺对染料质量浓度、色度、CODCr和氨氮的平均去除率分别为96.64%、95.83%、87.10%和51.43%.同期生物系统对应的平均去除率分别为42.80%、56.67%、79.23%和52.12%.结论电-生物耦合法对直接耐晒蓝B2RL染料废水的净化效果优于生物法.电-生物耦合法处理染料废水效果受到电流密度影响,在0.024~0.096 m A·cm^-2内电流密度越大处理效果越好.展开更多
基金sponsored by National Natural Science Foundation of China under Grant Nos.11575050 and 10805013One Hundred Talent Project of Hebei Province under GrantNo.SLRC2017021+3 种基金the Midwest Universities Comprehensive Strength Promotion Projectthe Natural Science Foundation of Hebei province,China,under Grant Nos.A2015201092,A2016201042 and A2015201199the Research Foundation of Education Bureau of Hebei province,China,under Grant No.LJRC011the 333 Talents Project of Hebei province,China,under Grant No.A2016005005
文摘A direct-current air plasma jet operated underwater presents three stable modes including an intermittently-pulsed discharge, a periodically-pulsed discharge and a continuous discharge with increasing the power voltage. The three discharge modes have different appearances for the plasma plumes. Moreover, gap voltage-current characteristics indicate that the continuous discharge is in a normal glow regime. Spectral lines from reactive species（OH, N2, N2^＋, Hα,and O） have been revealed in the emission spectrum of the plasma jet operated underwater.Spectral intensities emitted from OH radical and oxygen atom increase with increasing the power voltage or the gas flow rate, indicating that reactive species are abundant. These reactive species cause the degradation of the methylene blue dye in solution. Effects of the experimental parameters such as the power voltage, the gas flow rate and the treatment time are investigated on the degradation efficiency. Results indicate that the degradation efficiency increases with increasing the power voltage, the gas flow rate or the treatment time. Compared with degradation in the intermittently-pulsed mode or the periodically-pulsed one, it is more efficient in the continuous mode, reaching 98% after 21 min treatment.
文摘目的考查电-生物耦合法的强化降解性能.在生物水解反应器中添加微电场,以期能够促进水解,提高处理效果.方法在水解反应器中施加铁皮阳极,石墨柱阴极的微电场,形成电-生物耦合水解反应器,分别用电-生物耦合水解-好氧接触氧化法和生物水解-好氧接触氧化法处理直接耐晒蓝B2RL染料废水.停留时间：水解12 h,接触氧化7.95 h.电生物水解反应器采用电流密度依次为0.024、0.048、0.072、0.084和0.096 m A·cm^-2.结果电-生物系统对染料质量浓度、色度和CODCr的去除效果优于生物系统,对氨氮的去除效果则较生物系统差,且氨氮效果的差距随电流密度的增加而缩小.在电流密度为0.096 m A·cm^-2时,电-生物耦合工艺对染料质量浓度、色度、CODCr和氨氮的平均去除率分别为96.64%、95.83%、87.10%和51.43%.同期生物系统对应的平均去除率分别为42.80%、56.67%、79.23%和52.12%.结论电-生物耦合法对直接耐晒蓝B2RL染料废水的净化效果优于生物法.电-生物耦合法处理染料废水效果受到电流密度影响,在0.024~0.096 m A·cm^-2内电流密度越大处理效果越好.
