Secondary wastewater treatment removes pollutants like organic matter, nitrogen, and phosphorus that remain after primary treatment. This process uses biochemical reactions to degrade dissolved ...

There are four main types of industry: primary, secondary ... Buriganga River (Bangladesh), which turns black because of the pollutants. This river used to form part of the end of the Ganges.

The overall research goals are to quantify the emissions of primary pollutants and elucidate the formation mechanisms of secondary pollutants, especially ozone (O 3) and secondary aerosol. Much of ...

The primary pollutant was fire smoke with PM2.5, and secondary pollutants included 1-hour maximum concentrations of carbon monoxide, nitrogen oxides, and sulfur dioxide; the 8-hour maximum ozone ...