Chlorine Monitoring and Dechlorination Techniques Handbook

Chlorine Monitoring and Dechlorinating Techniques Handbook
Table 3-8
Summary of Dechlorinating Steps
Steps Emergency Response Planned Response
Step 1 - Preparation - prepare emergency response
kit in advance
Step 2 - Notify Authorities and
Record Activities
- notify the authorities having
jurisdiction in the area of the
release of chlorinated water
- record all activities in the
field for future reference and
as part of the due diligence
process
- have excess
dechlorinating agent onsite
- have tools and
equipment ready,
including spare parts
- record all activities in
the field for future
reference and as part of
the due diligence
process
Step 3 - Measure the TRC - assume chlorine is present - measure using field
monitoring kit
Step 4 - Prepare Stock Solution not applicable - prepare the solution in
advance using
information provided in
tables
Step 5 - Determine Flow Rates - estimate flow as best as
possible
- determine flow rate by
calculating, measuring
or estimating
- can also determine total
volume over a set time
period using the flow
rate
Step 6 - Determine Dosing Rate - overdosing is best approach - determine dosing rate of
dechlorinating solution
Step 7 - Add Dechlorinating
Agent
- add solid dechlorinating
agent in pre-filled fibre mesh
bags
- add dechlorinating
agent solution by using
chemical metering
pump
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