ABSTRACT

Sunlight-mediated disinfection in wastewater treatment ponds is widely recognised as the main role for disinfection, but pathogen removal can be limited by poor light penetration in the water column. The aim of this research is to evaluate a different and simple type of intervention for improving bacterial disinfection, by placing mid-depth transverse baffles perpendicular to the theoretical flow in an existing shallow maturation pond, aiming at increasing the opportunity for bacteria to receive radiation at the upper layers of the pond. In order to understand the hydrodynamic mechanisms and evaluate the effectiveness of the proposed intervention, a 3D Computational Fluid Dynamic (CFD) model was applied, including the transverse baffles and a particle-tracking model. This was complemented by monitoring E. coli in the pond, in the phase before and after inclusion of the transversal baffles. Overall, the transverse baffles increased disinfection efficiency by moulding/re-routing the hydrodynamic flow and increasing microorganism exposure to the sunlight.

摘要

废水处理池中的阳光介导消毒被广泛认为是消毒的主要作用，但病原体的去除可能会因水柱中光线穿透性差而受到限制。本研究的目的是通过在现有浅成熟池中垂直于理论流量放置中等深度横向挡板来评估一种不同且简单的干预措施，以改善细菌消毒，旨在增加细菌接受辐射的机会。池塘的上层。为了了解流体动力学机制并评估所提议干预的有效性，应用了 3D 计算流体动力学 (CFD) 模型，包括横向挡板和粒子跟踪模型。监测大肠杆菌对此进行了补充在池塘中，在包含横向挡板之前和之后的阶段。总体而言，横向挡板通过塑造/重新布置流体动力流和增加微生物暴露于阳光下来提高消毒效率。