Transport and survival of viruses in the subsurface—processes, experiments, and simulation models

Modeling the fate of viruses in aquifers: Multi-kinetics reactive transport, risk assessment, and governing parameters

The transport of viruses in groundwater is a complex process controlled by both hydrodynamic and reaction parameters. Characterizing the transport of viruses in groundwater is of crucial importance for investigating health risks associated with groundwater consumption from private individual or residential pumping wells. Setback distances between septic systems, which are the source of viruses, and pumping wells must be designed to offer sufficient groundwater travel times to allow the viral load to degrade sufficiently to be acceptable for community health needs. This study consists of developing numerical simulations for the reactive transport of viruses in the subsurface. These simulations are validated using published results of laboratory and field experiments on virus transport in the subsurface and applying previously developed analytical solutions. The numerical model is then exploited to investigate the sensitivity of the fate of viruses in saturated porous media to hydraulic parameters and the coefficients of kinetic reactions. This sensitivity analysis provides valuable insights into the prevailing factors governing health risks caused by contaminated water in private wells in rural residential contexts. The simulations of virus transport are converted into health risk predictions through dose-response relationships. Risk predictions for a wide range of input parameters are compared with the international regulatory health risk target of a maximum of 10-4 infections/person/year and a 30 m setback distance to identify critical subsurface contexts that should be the focus of regulators.

The Disposal of COVID-19 Dead Bodies: Impact of Sri Lanka's Response on Fundamental Rights

In early 2020, the Government of Sri Lanka decided that all bodies of individuals who had (or were suspected to have) died of COVID-19 should be disposed of by cremation alone. Although this decision appears to be neutral and does not give rise to de jure discrimination, as a matter of fact, it has significantly impacted the religious rights of the Muslim community in Sri Lanka. This is because they firmly believe in the need to bury the dead in a dignified and decent manner-cremation being regarded as a repugnant practice amounting to a desecration of the human body. As such, the Sri Lankan Government's decision to adopt a cremation-only policy interfered with the right of all Sri Lankan Muslims to manifest their religion or belief as guaranteed by the 1978 Constitution of Sri Lanka. Despite there being no scientific evidence to suggest that the burial of COVID-19 victims could give rise to contamination of the surroundings and thereby cause the spread of the virus, the Government of Sri Lanka continued with the policy for almost a whole year. Thereafter, due to international pressure, the Sri Lankan Government decided to allow burials but in a very restrictive manner. The objective of this article is to consider the extent to which the aforementioned decisions of the Sri Lankan Government are consistent with the fundamental rights framework of the country's Constitution.