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The change in nitrogen balance causes many environmental and socioeconomic impacts. In relation to food production and nitrogen release in wastewater systems, wastewater and sludge discharge and mineral fertilizer use intensify nitrogen imbalance of a region. The replacement of mineral fertilizer by nitrogen from treated wastewater, biosolids, and treated urine is a promising alternative. This work presents a model to support decision taking for the management of reactive nitrogen flows in wastewater systems based on system dynamics. Six scenarios were simulated for nitrogen flows in wastewater systems and related components.

Studies have showed that precarious sanitary conditions are directly related to the dissemination of the novel coronavirus. The objectives of this work are to characterize the transmission risks of novel coronavirus and to identify prevention and control strategies associated with water, sanitation, hygiene and waste management. The methodology included a review of literature carried out on data basis of Science Direct. After the application of search filters, 10 articles were selected for evaluation and association with the Brazilian context. The results indicated that the social vulnerability associated with the lack of access to adequate conditions of water, sanitation and waste management is one of main problems for the health preservation in times of pandemic.

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