本实验研究了Fe-Cu微电解法预处理炼焦废水的运行效果,并探讨了Fe-Cu双金属微电解法的反应机理。结果表明最佳运行条件为:HRT为45 min,p H值为4,铁铜质量比为5,曝气量为100 m L/min。此条件下COD的去除率达到35%-40%,酚的去除率达到37-...本实验研究了Fe-Cu微电解法预处理炼焦废水的运行效果,并探讨了Fe-Cu双金属微电解法的反应机理。结果表明最佳运行条件为:HRT为45 min,p H值为4,铁铜质量比为5,曝气量为100 m L/min。此条件下COD的去除率达到35%-40%,酚的去除率达到37-40%。污染物降解动力学过程符合一级反应。共存离子对微电解影响的研究结果表明NO3-,SO42-,NH4+离子对铁铜有一定的钝化,导致处理效果降低,而有还原性的S2-,NO2-等离子加入则会增加COD。Fe-Cu微电解法预处理炼焦废水是有效的方法。展开更多
A laboratory-scale anaerobic sequencing batch reactor (ASBR) was used to pretreat coking wastewater. Inoculated anaerobic granular biomass was acclimated for 225 d to the coking wastewater, and then the biochemical me...A laboratory-scale anaerobic sequencing batch reactor (ASBR) was used to pretreat coking wastewater. Inoculated anaerobic granular biomass was acclimated for 225 d to the coking wastewater, and then the biochemical methane potential (BMP)of the coking wastewater in the acclimated granular biomass was measured. At the same time, some fundamental technological factors, such as the filling time and the reacting time ratio (tf/tr), the mixing intensity and the intermittent mixing mode, that affect anaerobic pretreatment of coking wastewater with ASBR, were evaluated through orthogonal tests. The COD removal efficiency reached 38％～50％ in the stable operation period with the organic loading rate of 0.37～0.54 kg COD/(m3.d) at the optimum conditions of tf/tr, the mixing intensity and the intermittent mixing mode. In addition, the biodegradability of coking wastewater distinctly increased after the pretreatment using ASBR. At the end of the experiment, the microorganism forms on the granulated sludge in the ASBR were observed using SEM (scanning electron microscope) and fluoroscope. The results showed that the dominant microorganism on the granular sludge was Methanosaeta instead of Methanosarcina dominated on the inoculated sludge.展开更多
Dynamic effects of NO2--N accumulation were discussed owing to temperature.In different temperature,a series of vmax and Ks were found considering the relation between the temperature and rate of ammonia nitrogen tran...Dynamic effects of NO2--N accumulation were discussed owing to temperature.In different temperature,a series of vmax and Ks were found considering the relation between the temperature and rate of ammonia nitrogen transforming into NO2--N.The kinetics models,which reflected the conditions of ammonia nitrogen transforming into NO2--N in the treatment process of the coking wastewater,were built up.The characteristic coefficient temperature was determined according to Arrhenius.展开更多
文摘本实验研究了Fe-Cu微电解法预处理炼焦废水的运行效果,并探讨了Fe-Cu双金属微电解法的反应机理。结果表明最佳运行条件为:HRT为45 min,p H值为4,铁铜质量比为5,曝气量为100 m L/min。此条件下COD的去除率达到35%-40%,酚的去除率达到37-40%。污染物降解动力学过程符合一级反应。共存离子对微电解影响的研究结果表明NO3-,SO42-,NH4+离子对铁铜有一定的钝化,导致处理效果降低,而有还原性的S2-,NO2-等离子加入则会增加COD。Fe-Cu微电解法预处理炼焦废水是有效的方法。
基金Project (No. 40272108) supported by the National Natural Science Foundation of China
文摘A laboratory-scale anaerobic sequencing batch reactor (ASBR) was used to pretreat coking wastewater. Inoculated anaerobic granular biomass was acclimated for 225 d to the coking wastewater, and then the biochemical methane potential (BMP)of the coking wastewater in the acclimated granular biomass was measured. At the same time, some fundamental technological factors, such as the filling time and the reacting time ratio (tf/tr), the mixing intensity and the intermittent mixing mode, that affect anaerobic pretreatment of coking wastewater with ASBR, were evaluated through orthogonal tests. The COD removal efficiency reached 38％～50％ in the stable operation period with the organic loading rate of 0.37～0.54 kg COD/(m3.d) at the optimum conditions of tf/tr, the mixing intensity and the intermittent mixing mode. In addition, the biodegradability of coking wastewater distinctly increased after the pretreatment using ASBR. At the end of the experiment, the microorganism forms on the granulated sludge in the ASBR were observed using SEM (scanning electron microscope) and fluoroscope. The results showed that the dominant microorganism on the granular sludge was Methanosaeta instead of Methanosarcina dominated on the inoculated sludge.
文摘Dynamic effects of NO2--N accumulation were discussed owing to temperature.In different temperature,a series of vmax and Ks were found considering the relation between the temperature and rate of ammonia nitrogen transforming into NO2--N.The kinetics models,which reflected the conditions of ammonia nitrogen transforming into NO2--N in the treatment process of the coking wastewater,were built up.The characteristic coefficient temperature was determined according to Arrhenius.
