- A comprehensive biofiltration model and its calibration and validation for a large-scale nitrifying WRRF under upgrade A biofiltration model has been developed for the Seine Aval water resource recovery facility, the largest in France (SIAAP, Paris region), which is being upgraded. Based on biofiltration models found in literature, several improvements are realized with respect to mass transport and biological reactions. Evaluations of energy consumption (aeration and pumping) and greenhouse gas emissions are also integrated to the model. The model was calibrated and validated for the nitrifying biofilter process with large datasets collected before and after the upgrade of the plant. The simulation results show that the model can well describe the performance of the process for different treatment configurations using the same parameter values. The objective of this presentation is to share the practical modelling methodology and results of the modelling work for the nitrifying biofilters of the Seine Aval WWTP.
- Enhancing water supply resiliency by unlocking nitrate-contaminated groundwater Climate change can impact critical water supplies, especially in agricultural regions where water contamination by nitrate has already led to the shutdown of thousands of wells. Microvi’s innovative technology, called Microvi MNE, uses nature's own billion-year-old solution to turn nitrate into harmless nitrogen gas. Physical or chemical technologies for nitrate simply concentrate it, thereby producing a hazardous waste stream. This waste stream is expensive to manage and potentially damaging to the environment. Microvi’s nature-based solution for nitrate can be faster, more reliable and less expensive than any available technology--without producing a secondary waste stream.
- You Don’t Know What You’re Missing - Designing a Grit Removal System That Works Wastewater grit is often treated as an afterthought, yet wastewater treatment plants are significantly impacted by grit. Grit is a nuisance material, causing abrasive wear to equipment, increasing maintenance and operational costs and accumulating in processes throughout the plant, reducing processing capacity and efficiency over time.
Grit systems can work as intended when designed with an accurate understanding of the nature and characteristics of the grit arriving at the treatment plant and how this grit actually behaves in wastewater. An effective system addresses size as well as settleability, produces a clean dry product for landfill, and minimizes deposits and accumulations in the plant.
This presentation discusses grit system design criteria and provides guidelines for determining design requirements.