臭氧与共固定化微藻-活性污泥细菌共生体集成，用于高效现场处理肉类加工废水。
Integration of ozone with co-immobilized microalgae-activated sludge bacterial symbiosis for efficient on-site 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, USA.
Department of Food Science and Technology, Food Processing Center, University of Nebraska-Lincoln, Lincoln, NE, 68588-6205, USA; Daugherty Water for Food Global Institute, Nebraska Innovation Campus, University of Nebraska-Lincoln, Lincoln, NE, 68588-6204, USA.
出版信息
J Environ Manage. 2021 May 1;285:112152. doi: 10.1016/j.jenvman.2021.112152. Epub 2021 Feb 17.
Direct discharge of high concentration meat processing wastewater (MPW) into municipal sewage system will cause serious shock loading and reduce wastewater treatment efficiency, thus, efficient on-site pretreatment is usually required. Purpose of this study is to integrate ozone with microalgal biotreatment to achieve effective removal of both organic compounds and nutrients with one-step biodegradation and obtain high quality effluent dischargeable to municipal sewage system. Results showed that ozone pretreatment removed 35.0-90.2% color and inactivated 1.8-4.7 log CFU/mL bacteria in MPW. In post biotreatment using microalgae co-immobilized with activated sludge (ACS) bacteria, bacterial growth in ozone pretreated wastewater (7.1-8.1 log CFU/mL) were higher than non-pretreated control (6.0 log CFU/mL) due to enhanced biodegradability of wastewater pollutants. Algal biomass growth in wastewater pretreated with 0.5 (2489.3 mg/L) and 1 (2582.0 mg/L) minute's ozonation were improved and higher than control (2297.1 mg/L). Ozone pretreatment significantly improved nutrients removal. Following ozone pretreatment of 0.5 min, microalgal biotreatment removed 60.1% soluble chemical oxygen demand (sCOD), 79.5% total nitrogen (TN) and 91.9% total phosphate (PO) which were higher than control (34.4% sCOD, 63.4% TN, 77.6% total PO). Treated effluent contained 342.3 mg/L sCOD, 28.8 mg/L TN, 9.9 mg/L total PO and could be discharged into municipal sewage system. However, excessive ozone pretreatment displayed adverse impact on algal growth and sCOD removal. Therefore, integration of 0.5 min's ozone pretreatment with microalgae-based biotreatment is an efficient on-site treatment to simultaneously remove organic compounds and nutrients with one-step biodegradation.
将高浓度肉类加工废水（MPW）直接排放到城市污水系统会导致严重的冲击负荷，降低废水处理效率，因此通常需要高效的现场预处理。本研究的目的是将臭氧与微藻生物处理相结合，实现有机化合物和营养物质的有效去除，同时进行一步生物降解，并获得可排放到城市污水系统的高质量出水。结果表明，臭氧预处理可去除 MPW 中的 35.0-90.2%的颜色，并灭活 1.8-4.7 log CFU/mL 的细菌。在使用与活性污泥（ACS）细菌共固定化的微藻进行后生物处理时，臭氧预处理废水中的细菌生长（7.1-8.1 log CFU/mL）高于未预处理对照（6.0 log CFU/mL），因为废水污染物的生物降解性增强。在经过 0.5（2489.3 mg/L）和 1（2582.0 mg/L）分钟臭氧预处理的废水中，藻类生物量的生长得到改善，并且高于对照（2297.1 mg/L）。臭氧预处理显著提高了营养物质的去除率。在 0.5 分钟的臭氧预处理后，微藻生物处理去除了 60.1%的可溶性化学需氧量（sCOD）、79.5%的总氮（TN）和 91.9%的总磷（PO），高于对照（34.4% sCOD、63.4% TN、77.6%总 PO）。处理后的废水含有 342.3 mg/L 的 sCOD、28.8 mg/L 的 TN 和 9.9 mg/L 的总 PO，可以排入城市污水系统。然而，过量的臭氧预处理对藻类生长和 sCOD 去除有不利影响。因此，将 0.5 分钟的臭氧预处理与基于微藻的生物处理相结合是一种有效的现场处理方法，可同时进行一步生物降解，去除有机化合物和营养物质。
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