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UASB—A/O工艺处理淀粉、维生素B12混合废水工程设计与运行

时间:2022-10-28 13:48:03 来源:网友投稿

zoޛ)j馐u#PntIЎxh?/n4۝&8>h?/_;]fݵn @u٨ky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。

关键词:水污染防治工程;淀粉废水;维生素B12废水;UASB—A/O工艺;设计与运行

中图分类号:X522 文献标志码:A

Abstract:Starch and VB12 wastewater with higher COD and ammonia nitrogen concentration, contains a large number of difficult 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 Wastewater Discharge Standard(GB 8978—1996).

Keywords:water pollution control engineering; starch wastewater; VB12 wastewater; UASB—A/O process; design and operation

某公司是以玉米淀粉和维生素B12为主要产品的企业,生产过程中产生的废水均为高浓度有机废水。其中,淀粉废水中的污染物主要为可溶性淀粉、蛋白质、纤维等[1-2],维生素B12废水中的污染物主要为有机酸、残糖、酮类、氨氮等[3]。这两种废水的水质特征为有机物浓度高,氨氮浓度高,成分复杂,可生化性较好[4]。

对于高浓度有机废水多采用厌氧消化技术进行处理,该方法处理负荷高,能耗低,可回收沼气作能源[5];废水中的氨氮宜采用A/O工艺进行处理,该方法净化彻底,无二次污染[6-8]。针对废水的水质特征,采用UASB—A/O工艺对淀粉、维生素B12混合废水进行处理。

1 废水的水质水量

淀粉废水主要来自淀粉生产过程的分离工序和蛋白质回收工序[9],维生素B12废水主要为提炼工序产生的废液和精制工序产生的酸碱废水[10]。混合废水的水质水量见表1。

2 工艺设计

2.1 设计参数

1)设计规模 设计处理能力为5 000 m3/d。

2)设计水质 进水水质:pH值为 4.5,COD质量浓度为10 000 mg/L,总氮(TN)质量浓度为 250 mg/L;出水水质:满足《污水综合排放标准》(GB 8978—1996)中的一级标准要求,即pH值为6~9,COD质量浓度不大于100 mg/L、氨氮(NH3-N)质量浓度不大于25 mg/L。

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