UASB—A/O工艺处理淀粉、维生素B_(12)混合废水工程设计与运行

Design and operation of UASB—A/O process for treatment starch and VB_(12) wastewater

淀粉、维生素B12混合废水的COD和氨氮的浓度均较高,并含有大量的难生物降解物质,需采用稳定、高效的废水处理工艺对其进行净化处理,实现达标排放。采用UASB—A/O工艺处理淀粉、维生素B12混合废水,处理规模为5 000 m3/d。当进水COD质量浓度为8 544～9 720mg/L、总氮质量浓度为240～250mg/L时,处理系统出水COD质量浓度为78.4mg/L、氨氮质量浓度为18.7mg/L、总氮质量浓度为41.1mg/L,去除率分别可达99%以上、92.1%和82.7%。结果表明,采用UASB—A/O组合工艺对淀粉、维生素B12混合废水进行处理是可行的,各处理工艺单元的构成及设计参数选择合理且处理效果好,运行稳定,出水水质能够满足《污水综合排放标准》（GB 8978—1996）中的一级标准要求。

Starch and VB12 wastewater with higher COD and ammonia nitrogen concentration, contains a large number of diffi-cult biodegradable material, complex composition, is difficult to deal with. In recent years, with the increasingly stringent wastewater discharge standards, require the use of a stable and efficient wastewater treatment process for purification treatment of high concentration of ammonia nitrogen in wastewater and the refractory organic pollutants, to achieve discharge standards. Upflow Anaerobic Sludge Blanket （UASB）-Anoxic/Oxic（A/O） process was employed in a wastewater treatment of starch and Vitamin B12 wastewater,which was 5 000 m3/d with highly concentrated organic pollutants and ammonia. The efficiency and reliability of the process has been proven. The results of the system operation show that the concentration of the effluent COD, ammonia and total nitrogen （TN） were at 78. 4 mg/L, 18. 7 mg/L and 41. 1 mg/L, and the treatment efficiencies of COD, ammonia and TN reached over 99% , 92. 1% , 82. 7% , respectively, when the influent COD and TN concentration were in the ranges of 8 544？9 720 mg/L and 240？250 mg/L. The quality of the treated wastewater met the first-class discharge standards in Integrated Wastexvater Discharge Standard （GB 8978-1996）.