次氯酸钠预处理与共固定化微藻/细菌处理肉类加工废水的集成。
Integration of sodium hypochlorite pretreatment with co-immobilized microalgae/bacteria treatment of meat processing wastewater.
机构信息
Department of Food Science and Technology, Food Processing Center, University of Nebraska-Lincoln, Lincoln, NE 68588-6205, United States.
Department of Food Science and Technology, Food Processing Center, University of Nebraska-Lincoln, Lincoln, NE 68588-6205, United States; Daugherty Water for Food Global Institute, Nebraska Innovation Campus, University of Nebraska-Lincoln, Lincoln, NE 68588-6204, United States.
出版信息
Bioresour Technol. 2020 May;304:122953. doi: 10.1016/j.biortech.2020.122953. Epub 2020 Feb 4.
Wastewater with 0.2, 0.4, 0.8, 1.0 mg/L free chlorine was biologically treated using co-immobilized microalgae/bacteria. In contrast, non-pretreated wastewater was treated with beads (control) and blank beads (blank) under the same operating condition. Results showed that NaClO pretreatment removed 8-33% total nitrogen (TN), 31-45% true color and 0.7-2.5 log CFU/mL aerobic-bacteria. At the end of treatment, maximum algal biomass (2,027 dry weight mg/L) was achieved with 0.2 mg/L free chlorine. Bacterial growth in wastewater was decreased by NaClO pretreatment before reaching 7.2-7.7 log CFU/mL on the fifth day. Beads with microorganisms (control) removed 15% more chemical-oxygen-demand (COD), 16% more TN, and 13% more total phosphate (PO) than blank. Pretreatment with 0.2 mg/L free chlorine increased TN removal from 75% to 80% while pollutants removal was substantially decreased with 0.4-1.0 mg/L free chlorine. Considering algal biomass growth and pollutants removal, 0.2 mg/L free chlorine pretreatment was recommended for microalgae/bacteria co-immobilized system.
用 0.2、0.4、0.8 和 1.0mg/L 游离氯的污水进行了共固定化微藻/细菌的生物处理。相比之下，在相同的操作条件下，未经预处理的污水用珠粒（对照）和空白珠粒（空白）进行了处理。结果表明，次氯酸钠预处理去除了 8-33%的总氮（TN）、31-45%的真色和 0.7-2.5 log CFU/mL 需氧菌。在处理结束时，用 0.2mg/L 游离氯达到最大的藻生物量（2027 干重毫克/升）。次氯酸钠预处理会降低污水中的细菌生长，在第 5 天达到 7.2-7.7 log CFU/mL。与空白相比，带有微生物的珠粒（对照）去除了 15%更多的化学需氧量（COD）、16%更多的 TN 和 13%更多的总磷（PO）。用 0.2mg/L 游离氯预处理可将 TN 去除率从 75%提高到 80%，而用 0.4-1.0mg/L 游离氯处理会大大降低污染物的去除率。考虑到藻生物质的生长和污染物的去除，建议采用 0.2mg/L 游离氯预处理用于微藻/细菌共固定化系统。
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