at 14H00 | 518 B

Phosphorus Removal: 2.0 Solutions

Moderated by: Simon Vincent, Veolia
Innovation and clean technology

- Development of a Tertiary Phosphorus Removal Process: Passive Filtration with Two Simultaneous Mechanisms

The proliferation of cyanobacteria in water bodies result in a tightening of phosphorus discharge requirements in wastewater. In order to provide simple operational alternatives while performing well to achieve values as low as 0.3 mgPtot/L, development efforts need to be made. Since 2010, the Quebec Industrial Research Center (CRIQ), in collaboration with Université Laval, has been developing a passive technological approach consisting of trapping phosphorus in forest by-products specifically conditioned to act in adsorption and reductive dissolution. The technology is currently under development for real wastewaters. Among other things, an on-site piloting for 2 years for the continuous treatment of about 1 m3/day of tertiary effluent from a residual material management site (Gazon Savard Saguenay Inc.) has made it possible to evaluate the behavior of the technology under real conditions.

- Utilizing IOT, AI, and Algorithms to Optimize Chemical Treatments for Compliance with Phosphorous Effluent Permits

Acknowledging that Canadian municipalities, government agencies, fisheries, citizens and many other stakeholders in North America share concerns over phosphorous discharges - and the consequences for the environment - the authors wish to share their experiences in the UK, of meeting effluent guidelines by utilizing one of the lowest CAPEX & OPEX options - chemically enhanced tertiary treatments (CETT). A relevant case to be presented was initiated by the Water Framework Directive (WFD). Under this directive, the UK has been driven to tighten effluent phosphorus levels down to 0.5 mg/l in their Asset Management Plan 6 (AMP6) and even further to 0.1 mg/l in AMP7. The presentation will discuss: implementation using auto-optimized dosing systems, remote monitoring of effluent phosphorus levels, automatic reporting of deviations from set targets, predictions of maximum and minimum chemical usages over the fiscal year, and having it all occur in real-time.

- Phosphorus removal from domestic wastewater by steel slag filters – challenges in process development

Steel slag filters are a passive technology that is promising for phosphorus removal in decentralized applications: phosphorus concentration at effluent below 1 mg P/L is often reached with potentially low cost and level of maintenance. Slag filters, however, are not yet commonly implemented due to technical challenges. In this presentation, process development work conducted at Polytechnique Montreal in recent years will be discussed, based on fifteen experimental projects conducted between 2009 and 2018. Important challenges were solved: neutralization of the effluent before discharge, prediction of filter lifetime and media replacement frequency, removal of soluble and particulate phosphorus and reactor configuration in various contexts.