WASTEWATER
By Rick Lallish
What part of a gravity belt thickener clears a path on the belt where the water falls freely through the belt?
A. Polymer inlets
B. Linear tension rods
C. Chicanes
D. Rivets
Answer: C. Gravity belt thickeners are very effective in thickening sludge for further conditioning before land application. They can achieve 0.4-8% solids, and sometimes higher. The devices remove water from the chemically conditioned sludge as it moves across a woven or porous belt. Chicanes are placed along the width and length of the belt. In addition to clearing a path, the chicanes assist in rolling the material, allowing the more filtrate to
