Page 218 - Water and wastewater engineering

CHEMICAL HANDLING AND STORAGE 5-21

Vent
Dust collector
Manhole
Large radius elbow

Cylindrical
lime
Pneumatic
silo
conveying pipe Load cell

Bin activator
Bin gate
10 cm dia. fill connection
to bulk delivery truck
Flexible coupling
Gravimetric dry
chemical feeder

Overflow

Slaker

Plastic milk Slaker
crate lined with discharge To venturl
hardware cloth Drain
eductor

FIGURE 5-6
Lime materials storage, handling, and feed system. Two feeder slaker units are required for redundancy.
Both may serve one silo. Transfer from the silo to day bins may also simplify measuring chemical usage.

Visit the text website at www.mhprofessional.com/wwe for supplementary materials
and a gallery of photos.

5-9 CHAPTER REVIEW
When you have completed studying this chapter, you should be able to do the following without
the aid of your textbooks or notes:
1. Given the plant capacity and/or the scenario for discharge, determine the number of
feeders required.
2. Describe a method for covering the range of feed capacities required when the turn-
down ratio of the feeder may not be sufficient.

3. Explain why the liquid chlorine level in chlorine tanks is nominally at 85 percent of the
volume of the tank.
4. Explain the difference between interruptible and noninterruptible chemicals and give
examples of each.