维生素类制药废水深度处理中试研究

采用"水解酸化—复合厌氧—流离生物床—臭氧—三相生物流化床"工艺对维生素类制药废水处理后的出水进行深度处理。由于废水的可生化性极差,将其与生活污水混合后,BOD/COD值由0.05提高到0.18。中试试验结果表明,利用水解酸化和臭氧氧化对废水可生化性进行改善,可使COD和氨氮的去除率分别达到80%和90%以上。出水COD和氨氮完全达到GB18918—2002《城镇污水处理厂污染物排放标准》的一级A标准要求。

Pilot study on the advanced treatment of vitamins-making pharmaceutical sewage

The given article is concerned about a renovated method of advanced treatment of vitamins-making pharmaceutical sewage developed by its authors known as "hydrolytic acidification integrated anaerobic-flow-separated bio-bed-ozonation three-phase bio-fluid bed" treating method.The so-called three phase of biofluid bed treating can be summarized as follows: First of all,we have to let the sewage pass through a hydrolytic acidification reaction cell,which accounts for the regulation of water quality and water quantity.It is for this purpose,the water entering the cell has to be purified and then the macromolecular and micro-molecule organic compounds were let to be decomposed with the biodegradability of the sewage improved.And then,when the purified sewage flew through the two reaction cells,that is,the hybrid anaerobic reaction cell and the flow-separating biological bed,the organic materials in the sewage would be split into pieces by microorganisms in the two reactors.The pollutant-removing rate should be accelerated in this stage.Thirdly,there will be an ozone oxidation system added to promote the decomposition of the residual refractory organisms and heighten the biodegradability,with which the organisms are to be degraded by the microbiological device in the three-phase bio-fluidized bed.Since the biodegradability of the sewage is poor by nature,it should get easily mixed with the rest part of sewage.But,it is possible to increase the biodegradability of the sewage by adding BOD/COD value from 0.05 to 0.18.In addition,the effluent of flow-separated biological bed can help to increase its COD removal from 14.7% to 43.4% prior to the mixture.Thus,the results of our pilot test prove that the process of hydrolysis pretreatment and the three-step ozonation bio-fluidized bed,when combined with the advanced treating technology,are expected to promote the biodegradability of the sewage and heighten the removing rate.Besides,since the hydrolysis phase is favorable for reducing its COD value with the average COD removing rate of 17.8%,it is also favorable for reducing its volatility.All these factors should contribute to increasing the average COD removing rate to 49.8% in the three ozonation-phase bio-fluidized bed.For the period of 20 d running,the COD concentration of the entire system remains below 50 mg/L,with NH+4N concentration being the lowest at a level of 0.25 mg/L.And,finally,the COD and NH+4N removing rate should be managed to reach about 80% and 90%.The effluent quality of COD and NH+4-N can be managed to achieve class A in the Discharge Standard of Pollutants for Urban Sewage Treating Plant(GB 18918—2002).So far as we can see,the treating method developed by us can not only heighten the biodegradability of the sewage,but is able to increase the removing rate of COD and ammonia nitrogen.