Using which of the following methods can assist in reducing turbidity in discharged water?

The application of a sand filter is effective in reducing turbidity in discharged water as it functions by physically removing suspended particles and pollutants through a filtration process. When water passes through the layers of sand, larger particles are trapped on the surface, and smaller particles are captured in the spaces between sand grains. This method is particularly beneficial in stormwater management, where high turbidity can result from runoff containing sediment and other particulates.

Organic fertilizers, while beneficial for soil health and plant growth, do not address turbidity directly. They can potentially contribute to turbidity by introducing additional nutrients that may promote the growth of algae or other microorganisms, which can cloud water. Silt fences are primarily designed to prevent sediment from leaving a construction site, but they do not actively filter water or reduce turbidity; rather, they temporarily hold sediment in place until it can settle out.

The sand filter's ability to physically strain particulates makes it the most effective choice for reducing turbidity among the options presented.