Integrating dairy manure for enhanced resource recovery at a WRRF: Environmental life cycle and pilot‐scale analyses
Integrating dairy manure for enhanced resource recovery at a WRRF: Environmental life cycle and pilot‐scale analyses
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DOI：
10.1002/wer.1574
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发表时间：
2021-04
影响因子：
3.1
通讯作者：
C. Bryant;Erik R. Coats
中科院分区：
文献类型：
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作者：
C. Bryant;Erik R. Coats
爱达荷州的双子瀑布污水处理厂（WWTP）目前的运作完全是为了达到监管许可的要求。进行了研究以评价将污水处理厂转变为水资源回收设施和评价水资源回收设施的环境可持续性；对生产再生水、生物固体、鸟粪石、沼气和生物塑料（聚羟基烷酸酯，PHA）这五种资源的工艺配置进行了评估。利用发酵的牛粪产生PHA。使用Dynamita的SUMO过程模型进行的最先进的生物动力学建模与环境生命周期评估相结合，以量化环境可持续性。结果表明：热电联产在实现环境可持续性方面最为重要；能源补偿从43%到60%不等，从而减少了对外部化石燃料能源的需求。鸟粪石的生产有助于维持弹性增强生物除磷（EBPR）过程，而MgO2的生产则对环境产生负面影响；与热电联产的整合消除了不良后果。利用牛粪生产生物塑料使资源回收组合多样化，同时保持WRRF环境的可持续性；中试规模的评估表明，WRRF出水质量不受PHA生产废水的影响。总体而言，研究结果表明，将奶牛粪便纳入WRRF可以在以环境可持续方式运营的同时，生产多样化的产品组合。
The Twin Falls, Idaho wastewater treatment plant (WWTP), currently operates solely to achieve regulatory permit compliance. Research was conducted to evaluate conversion of the WWTP to a water resource recovery facility (WRRF) and to assess the WRRF environmental sustainability; process configurations were evaluated to produce five resources—reclaimed water, biosolids, struvite, biogas, and bioplastics (polyhydroxyalkanoates, PHA). PHA production occurred using fermented dairy manure. State‐of‐the‐art biokinetic modeling, performed using Dynamita's SUMO process model, was coupled with environmental life cycle assessment to quantify environmental sustainability. Results indicate that electricity production via combined heat and power (CHP) was most important in achieving environmental sustainability; energy offset ranged from 43% to 60%, thereby reducing demand for external fossil fuel‐based energy. While struvite production helps maintain a resilient enhanced biological phosphorus removal (EBPR) process, MgO2 production exhibits negative environmental impacts; integration with CHP negates the adverse consequences. Integrating dairy manure to produce bioplastics diversifies the resource recovery portfolio while maintaining WRRF environmental sustainability; pilot‐scale evaluations demonstrated that WRRF effluent quality was not affected by the addition of effluent from PHA production. Collectively, results show that a WRRF integrating dairy manure can yield a diverse portfolio of products while operating in an environmentally sustainable manner.