Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite.

The typical disposal of high-arsenic waste acid is at the expense of discharging a large quantity of hazardous solid waste, resulting in secondary pollution of arsenic. We propose a modified lime/ferric salt method for high-arsenic waste acid disposal by the stepwise formation of gypsum and scorodite at atmospheric pressure. The sulfuric acid in the high-arsenic waste acid is first removed by calcium carbonate generating gypsum, and then the arsenic in the solution is precipitated in form of scorodite.

[Susceptibility of 15 collections of Aedes albopictus from Guizhou to dengue virus oral infection].

Objective: To study the susceptibility of Aedes albopictus to dengue virus infection.

Methods: Aedes albopictus from 15 collections in Guizhou province were challenged orally with dengue virus 1-4 types, respectively. The total RNA from mosquitos were extracted.