Arthur Wellington, Morgan Zach, Reina Antillon Marco, Drabold Edward, Wells Daniel E, Bourassa Dianna V, Wang Qichen, Higgins Brendan T
Biosystems Engineering, Auburn University, Auburn, Alabama 36849, United States.
Department of Poultry Science, Auburn University, Auburn, Alabama 36849, United States.
ACS ES T Water. 2024 Aug 2;4(9):3964-3975. doi: 10.1021/acsestwater.4c00262. eCollection 2024 Sep 13.
Poultry processing wastewater (PPW) is a nutrient-rich effluent with the potential for reuse in crop irrigation. This study investigated transforming PPW into a hydroponic nutrient solution using a pilot scale "poultryponics" system operated continuously for 222 days. The system treated ∼57 L d of real PPW and consisted of bioreactors (inoculated with a consortium of microalgae and nitrifying bacteria), clarifiers, membrane filters, a UV disinfection unit, and a deep-water hydroponic system. The system was evaluated in terms of nitrogen transformation, organic removal efficiency, and pathogen levels. Although soluble organic removal efficiencies (sCOD) were high (>80%) in all bioreactors, nitrification was limited due to high organic loading (350-800 mg sCOD L), relatively short retention time (24 h), and low dissolved oxygen levels (<3.5 mg O L). Grow beds showed significant nitrification, indicating the importance of upstream organic removal. CO supplementation (0.5% v/v) in bioreactors did not promote nitrification in the bioreactors but was beneficial for nitrification in grow beds due to pH-modulating effects. Microbiological analyses showed no detection in bioreactors and substantial reductions in total coliform (∼40%) and aerobic plate counts (∼30%) after UV treatment. These findings demonstrate the sustainable and safe reuse of nutrient-rich industrial effluents in agriculture.
家禽加工废水（PPW）是一种营养丰富的废水，具有用于作物灌溉再利用的潜力。本研究使用一个连续运行222天的中试规模“家禽水培系统”，研究将PPW转化为水培营养液。该系统处理约57升/天的实际PPW，由生物反应器（接种微藻和硝化细菌联合体）、澄清器、膜过滤器、紫外线消毒单元和深水水培系统组成。对该系统在氮转化、有机物去除效率和病原体水平方面进行了评估。尽管所有生物反应器中可溶性有机物去除效率（sCOD）都很高（>80%），但由于高有机负荷（350 - 800毫克sCOD/升）、相对较短的停留时间（24小时）和低溶解氧水平（<3.5毫克O₂/升），硝化作用受到限制。种植床显示出显著的硝化作用，表明上游有机物去除的重要性。生物反应器中补充CO₂（0.5% v/v）并未促进生物反应器中的硝化作用，但由于其pH调节作用，对种植床中的硝化作用有益。微生物分析表明，生物反应器中未检测到病原体，紫外线处理后总大肠菌群（约40%）和好氧平板计数（约30%）大幅减少。这些发现证明了营养丰富的工业废水在农业中的可持续和安全再利用。
