1.

What is the surface area of the River rock (Small) packing material used in trickling filters as the packing medium?

A. t60 m<sup>2</sup>/m<sup>3</sup>
B. t90 m<sup>2</sup>/m<sup>3</sup>
C. t98 m<sup>2</sup>/m<sup>3</sup>
D. t150 m<sup>2</sup>/m<sup>3</sup>
Answer» B. t90 m<sup>2</sup>/m<sup>3</sup>


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