铁碳微电解预处理高盐腌制废水的运行方式研究

Operation Mode of Iron-carbon Microelectrolysis Pretreating High Salinity Pickle Wastewater

采用烧杯试验、铁碳微电解柱试验以及不同处理方式对比试验,考察了铁碳微电解技术对高盐腌制废水的预处理效能,并分析了铁碳微电解柱运行方式对处理效果的影响。结果表明,铁碳微电解法对高盐腌制废水的COD和PO3-4-P具有良好的去除效果,去除率分别为28%和100%,但对NH+4-N没有去除效果,且原水与铁碳填料的接触振荡时间为120 min即可。同时,铁碳微电解法显著提高了高盐腌制废水的可生化性,活性污泥对经过铁碳微电解处理后的废水COD比降解速率从0. 285 6 gCOD/(gVSS·h)提高到0. 430 7 gCOD/(gVSS·h)。铁碳微电解柱内水流紊动性是影响处理效果的关键因素,上向流连续运行模式下,铁碳填料几乎没有发挥作用,采用序批式运行设置微曝气能够提高水流紊动性,从而确保铁碳填料的预处理效果。经铁碳微电解预处理后,生物接触氧化单元对高盐腌制废水COD的去除率提高了13. 7%。

Pretreatment efficiency of high salinity pickle wastewater by iron-carbon microelectrolysis technology was investigated through beaker test, iron-carbon microelectrolysis column test and comparative test of different treatment methods. Moreover, the influences of iron-carbon microelectrolysis column operation mode on the treatment effect were discussed. The results showed that the iron-carbon microelec- trolysis had a good removal effect on COD and PO4^3 P of the high salinity pickle wastewater when vibra- tion contact time of raw water and iron-carbon filler was as short as 120 min, and the removal rates were 28% and 100% respectively, but there was no removal effect on NH4 - N. Meanwhile, biodegradability of the high salinity pickle wastewater was improved significantly by the iron-carbon microelectrolysis, and the specific COD degradation rate of the effluent from iron-carbon microelectrolysis by activated sludge was increased from 0. 285 6 gCOD/（gVSS · h） to 0. 430 7 gCOD/（gVSS · h）. Water turbulence in the iron-carbon microelectrolysis column was the key factor which influenced the treatment efficiency. The iron-carbon fillers hardly worked under upflow continuous operation mode, while micro-aeration with sequencing batch operation could improve the flow turbulence and ensured the pretreatment effect of iron carbon filler. The COD removal rate of the high salinity piekle wastewater in biological contact oxidation unit was increased by 13.7% after the iron-carbon microelectrolysis pretreatment.