Table 10-13.TroubIeshooting Effluent DisposalContinued
ACTIONS TO TAKE
Effluent pH too
low or too high.
very little treat-
ment being pro-
1. Secondary units organi-
2. Hydraulic overload.
1. Industrial discharges not
2. Septic conditions in col-
lection system or in the
Toxic material leaking or
being discharged to the col-
1. Not enough chlorine
2. Chlorine not well mixed
with the wastewater.
3. Contact time too short.
1. Keep organic loading of secondary units
within design capacity if reasonably possible.
Carefully inspect aerated units for DO con-
tent and mixing.
2. Same action as for too many settleable
solids in the effluent due to hydraulic
1. Inspect and sample the wastewater from the
collection system to find the source. Require
or provide proper pretreatment.
2. Inspect both collection system and plant
for detention time in sewer pipes, wetwell,
and clarifiers. Clean and flush clogged or
partly clogged sewers. Aerate and/or chlori-
nate the influent wastewater for temporary
Immediately notify downstream users and
regulatory authorities, giving all available
information as to type and quantity of toxic
substance, also time of release. If the operator
has advance warning of a spill or discharge
of toxic waste, then all available storage
should be used to contain the toxic material
instead of letting it pass through the plant. If
it cannot be contained, use all available
methods to neutralize and/or dilute the toxic
waste. Try to find the source of the toxic
material and use every reasonable means to
prevent its discharge to the system.
1. Test several times daily for free chlorine
residual, especially during and immediately
after peak flows. Adjust dose of chlorine
according to test results. Inspect chlorine feed
pump for working condition. If chlorine com-
pounds such as HTH and others are being
used, be sure of its percentage of chlorine con-
tent when adjusting the feed rate (dose).
2. Inspect mixing equipment to be sure the
chlorine and wastewater are well mixed
immediately. Test for free chlorine residual
in several areas of the contact tank to be sure
of proper mixing.
3. Carefully check the contact (detention) time
of the tank to be sure that 15 to 30 minutes
contact time is provided. Remove sludge
deposits, if any are present, from the contact