Considerations/guiding principles when dosing BCP® chemistry:
System Size – how long does it take to circulate the chemistry through the system?
- Allow ample contact time for BCP® chemistry to soak into deposits.
- When the slurry dissipates, BCP® chemistry goes back to surfaces and continues the cleaning process. Give it time to work through that process.
- How many processes/surfaces are in the system?
- More system surfaces offer a higher potential for biofouling=more deposits for BCP® chemistry to interact with
- More surfaces = more circulation/cleaning time
Recirculation rate (related to system size)
- How long will it take a slug to get through the system?
- What is the blow down rate which will remove some of the chemistry?
- Can you turn off the blow down temporarily to let the chemistry circulate longer?
How fouled is the system?
- More fouling deposits will put a greater demand on the chemistry and generate more slurry.
Are there areas of high agitation?
- Greater agitation causes more foaming in general. (mechanical mixing of organics and air)
Where are you dosing?
- Dosing in the cold well, or into the discharge line from the tower, allows the chemistry to get to the heat exchanger and piping surfaces before going through the cooling tower.
- If you dose into the return line to the towers, you will put a higher concentration of chemistry in the cooling tower which has more agitation and greater foaming potential.
Always confirm the compatibility of all chemicals, including BCP® chemistry, at the concentrations they are expected to be in contact at any location in the system. (including side stream loops, and tower basin discharge or return lines)
BCP® chemistry has been used successfully with most common oxidizing biocides (including chlorine-based, bromine-based, DCDMH/DBDMH/BCDMH, Justeq-07, chlorine dioxide, hydrogen peroxide, peracetic acid, chloramines, mixed oxidants), and non-oxidizing biocides (Isothiazolone, TTPC/Bellacide, DBNPA, bronopol, THPS, quats/polyquats, carbamates, glutaraldehyde). Keep in mind, in some cases applying glutaraldehyde and BCP® chemistry together may cause the water to develop a pink tint.
General Dosing Considerations
If you dose into a side stream loop:
- The concentration of all of the chemicals will be at high concentrations. Best practice is to not dose multiple chemicals in the side stream loop at the same time.
- If you can’t control timing, confirm the compatibility of all chemicals at the concentration in which they will interact in the side stream loop.
How quickly are you pumping the chemical in the system?
- If the chemical is pumped in at a faster rate or isn’t in an area with good mixing- you will have zones of higher chemical concentrations.
