Using Water Storage Reservoir as Contact Basin
Using Water Storage Reservoir as Contact Basin
(OP)
Does anyone have any experience or thoughts about using a large water storage reservoir to obtain the chlorine contact time for a hypochlorite disinfection system? I have been asked to look at the possibility of adding hypochorite prior to a 240,000 gallon circular water storage reservoir and then using the time that the water is in the reservoir to obtain the required contact time. I am concerned about short circuiting. This tank will be over 50 feet tall. Would adding large vertical curtain baffles inside the tank to make a more serpintine flow path do much good? Has anyone seen this done?





RE: Using Water Storage Reservoir as Contact Basin
There are companies that make spiral mixers that might be better suited for your application.
Is there a typo in you dimensions? You say the tank is 240,000 gallons, yet it is 50 ft. tall. Is that the tank elevation or height?
RE: Using Water Storage Reservoir as Contact Basin
RE: Using Water Storage Reservoir as Contact Basin
CT went from 7500 gallon equivalent to 30,000 gallon equivalent with 3 walls
The forces on the walls is not noticeable.
mixing will shorten CT, cause what counts is the first 10% and mixing will ensure that 10% will go fast to the exit.
The testing protocol I used: step change the chlorine dose. The results are set when 10% of the final change appears in the outlet. Initial residual 0.5 ppm , a step change to final residual of 1.0 ppm. time is counted when reading is 0.55 ppm.
Hydrae
RE: Using Water Storage Reservoir as Contact Basin
Steve
RE: Using Water Storage Reservoir as Contact Basin
I am pushing to keep money in the budget to perform tracer testing of the finished tank and baffling so that we can determine actual CT values of the "as-built" system and then look at ways to improve the CT through the tank if necessary.
RE: Using Water Storage Reservoir as Contact Basin
We proposed to build a reservior for aprox. 1,000,000 gallon of water.
the water source is a stream/river that is in the same location which will be use. I would like your assitance in the design for this project which include pumping, filtering and sterlizing/chorinating of the water for human consumption
Dannyc1
RE: Using Water Storage Reservoir as Contact Basin
You might find it more helpful to start a new thread and ask your question there.