Pre-oxidation of biosolids to enhance anaerobic digestability

污泥的处理是污水处理厂运行的主要经济因素。污泥或生物固体的处理和管理费用占废水处理总费用的50%-60%。厌氧消化是世界上应用最广泛的污泥稳定过程，它分解污泥中约40-50%的有机物，形成有价值的沼气（甲烷），并在处理前降低污泥中的病原体含量。传统消化工艺的一个缺点是污泥水解速度慢，需要大容量消化器。提出的研究将通过引入污泥的氧化预处理来解决这个问题。高级氧化过程（AOPs）的各种组合被称为羟基自由基的原位生产者在实际数量将用于生物固体预处理。该项目的目标是确定最佳污泥预处理条件，以减少厌氧沼气池的体积，并带来额外的好处，如提高沼气产量，控制沼气中的硫化氢和气味，减少鸟粪石和/或鸟粪石沉淀引起的结垢，改善污泥的脱水能力，增强污泥在复杂有机化合物（如内分泌干扰化合物（EDC）和病原体）方面的稳定性。

Disposal of waste sludge is a major economical factor in operation of wastewater treatment plants. Sludge or biosolids processing and management costs account for 50%-60% of the overall wastewater treatment costs. Anaerobic digestion, which is the most widely used sludge stabilization process worldwide, breaks down about 40-50% of the organic matter of the sludge to form valuable biogas (methane) and to reduce pathogen content of the sludge prior to disposal. A disadvantage of the traditional digestion process is the slow sludge hydrolysis rate requiring large volume digesters. The proposed research will address this by introducing oxidative pretreatment of the sludge. Various combinations of advanced oxidation processes (AOPs) that are known as in-situ producers of hydroxyl radicals in practical quantities will be used for biosolids pretreatment. The objective of this project is to determine optimum sludge pretreatment conditions that will reduce the volume of anaerobic digesters with additional benefits such as higher biogas production, control of hydrogen sulfide and odor in the biogas, reduced scaling due to struvite and/or vivianite precipitation, improved dewaterability of sludge and enhanced sludge stabilization with respect to both complex organic compounds such as endocrine disruptive compounds (EDC) and pathogens.