Recirculating Hydrolyzed Biosolids to Anaerobic Digestion Process: Impact on Nutrients and Recalcitrant Organics

在加拿大，市政污水处理厂每年产生约78万吨干吨生物固体，其中约50%是土地利用的生物固体。生物固体是废水处理过程中产生的营养丰富的有机物质，经过充分处理后可以安全地应用于土地。生物固体的土地应用已被证明是一种经济有效的废物处理方法，它有利于回收有机质和养分，并改善土壤质量。然而，没有得到充分处理的生物固体也可能对环境和人类健康构成潜在威胁。实现完全治疗的一种方法是通过合作组织Lystek使用专利LystMize®工艺。Lystek工艺是一种创新的、节能的低温热化学污泥水解技术，它使用专有的热、高pH值和高剪切混合的组合来产生高固体含量和无病原体的产品。这项拟议工作的目标是评估使用LysteMize®工艺处理生物固体时营养物质和顽固有机物的去向。

In Canada, municipal wastewater treatment plants generate an estimated 780,000 dry tonnes of biosolids per year, of which about 50% of the biosolids are land applied. Biosolids are nutrient rich organic material resulting from wastewater treatment that has been sufficiently processed to be land-applied safely. Land application of biosolids has proven a cost-effective method of waste disposal by beneficially recycling organic matter and nutrients and improving soil quality. However, not fully treated biosolids may also pose a potential threat to the environment and human health. One way of achieving complete treatment is through the use of a patented LystMize® process by the partnering organization Lystek. The Lystek process is an innovative, energy efficient and low temperature thermal-chemical sludge hydrolysis technology which uses a proprietary combination of heat, high pH, and high shear mixing to generate high solids and pathogen free product. The objective of the proposed work is to assess the fate of nutrients and recalcitrant organics in biosolids when processed using LysteMize® process.