Environmental Engineering Reference
In-Depth Information
filter effluent tests
•
Dissolved oxygen
• pH
• Jar tests
Process effluent tests
•
Dissolved oxygen
•
pH
• Settleable solids
• BOD
5
• Suspended solids
7.3.7 Troubleshooting operational Problems
*
The following sections are not all inclusive; that is, they do not
cover all of the operational problems associated with the trickling filter
process. They do, however, provide information on the most common
operational problems.
7.3.7.1 Ponding
Symptoms
•
Small
pools or puddles of water on the surface of the media
•
Decreased performance in the removal of
BOD and TSS
•
Possible odors due to anaerobic conditions in the media
•
Poor air flow through the media
Causal factors
•
Inadequate
hydraulic loading to keep the media voids flushed clear
•
Application of high-strength wastes without sufficient recircula-
tion to provide dilution
•
Nonuniform media
•
Degradation of the
media due to aging or weathering
•
Uniform media that is too small
•
Debris (moss, leaves, sticks) or living organisms (snails) that clog
the void spaces
*
Much of the information in this section is based on Culp, G.L. and Heim, N.F.,
field
manual for Performance evaluation and Troubleshooting at municipal Wastewater
Treatment facilities
, U.S. Environmental Protection Agency, Washington, D.C., 1978.
