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Natural zeolites as clinoptilolite may be used to recover wastewater ammonium, decrease the nitrogen content in the effluent from on-site sanitation systems and in wastewater treatment plants when nitrification-denitrification efficiency is low. The objective of this study was to estimate the ammonium adsorption capacity of clinoptilolite when being loaded with wastewater. Phosphorus and potassium sorption, ammonium desorption with tap water, and clogging were also studied. The study was performed by column experiments. Results of the investigation showed the ammonium adsorption capacity to increase with decreasing grain size, and the highest experimental adsorption capacity was 2.7 mg NH 4 -N/g. The breakthrough occurred immediately, probably due to a too high loading rate. Phosphorus and potassium sorption were minor. Of adsorbed ammonium, 23% was desorbed by tap water and desorption was more pronounced during saturated conditions. Filter clogging was extensive and probably caused by particles in the effluent wastewater and by microbiological growth.Résumé : Les zéolithes naturelles, tels que la clinoptilolite, peuvent être utilisées pour récupérer l'ammonium dans les eaux usées et diminuer l'effluent azoté des systèmes d'assainissement sur place et des usines de traitement des eaux usées lorsque l'efficacité de nitrification-dénitrification est faible. L'objectif de la présente étude était d'estimer la capacité d'adsorption d'ammonium de la clinoptilolite lorsque chargée avec des eaux usées. La sorption du phosphore et du potassium, la désorp-tion de l'ammonium avec l'eau du robinet, ainsi que l'encrassement ont également été étudiés. L'étude a été effectuée sur les colonnes. Les résultats de l'étude ont montré que la capacité d'adsorption d'ammonium augmente avec la diminution de la granulométrie et que la plus forte capacité d'adsorption expérimentale était de 2,7 mg NH 4 -N/g. La crevaison du filtre est survenue immédiatement, probablement en raison d'un taux de charge trop élevé. La sorption du phosphore et du potassium était mineure. De tout l'ammonium adsorbé, 23 % était désorbé par l'eau du robinet et la désorption était plus prononcée en conditions saturées. L'encrassement du filtre était généralisé et probablement causé par la présence de particules dans l'effluent d'eaux usées et la croissance microbiologique.

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The presence of SARS-CoV-2 RNA in wastewater was first reported in March 2020. Over the subsequent months, the potential for wastewater surveillance to contribute to COVID-19 mitigation programmes has been the focus of intense national and international research activities, gaining the attention of policy makers and the public. As a new application of an established methodology, focused collaboration between public health practitioners and wastewater researchers is essential to developing a common understanding on how, when and where the outputs of this non-invasive community-level approach can deliver actionable outcomes for public health authorities. Within this context, the NORMAN SCORE “SARS-CoV-2 in sewage” database provides a platform for rapid, open access data sharing, validated by the uploading of 276 data sets from nine countries to-date. Through offering direct access to underpinning meta-data sets (and describing its use in data interpretation), the NORMAN SCORE database is a resource for the development of recommendations on minimum data requirements for wastewater pathogen surveillance. It is also a tool to engage public health practitioners in discussions on use of the approach, providing an opportunity to build mutual understanding of the demand and supply for data and facilitate the translation of this promising research application into public health practice.

Integrated approach to assess the sustainability of on-site sanitation systems.