Biodispersant for cooling tower

Question

hi guys.
how much biodispersant (ppm) for cooling tower must be inject  to get the best result?
Help much appreciated!
 
system volume: 3000 m3
No of concentration: 2
delta T: 6.5  Celsius
PH: 7.4
total H: 1200 ppm
ca H: 700 ppm
chloride: 1000 ppm
turbidity: 10  ntu
EC: 3800 micro s/cm

Water Network Research · Accepted Answer

Here is the answer from Chat GPT
The optimal dosage of biodispersant for a cooling tower system depends on several factors, including the specific characteristics of the water, the system's operating conditions, and the type of biodispersant being used. Biodispersants are chemicals used to prevent biofouling in cooling systems by dispersing biological matter, thereby preventing the formation of biofilm and microbial growth.
Given your system’s parameters, here’s a general guideline on how to approach the determination of biodispersant dosage:
Factors to Consider:
System Volume: Your system has a volume of 3000 m³.
Water Quality Parameters: PH, total hardness, calcium hardness, chloride concentration, turbidity, and electrical conductivity (EC) all influence the tendency for scale and biofilm formation.
Cooling Tower Operation: The number of concentrations, delta T (temperature differential), and flow rate affect the concentration of minerals and the potential for biofouling.
Biodispersant Dosage Estimation:
Manufacturer’s Recommendation: Always start with the manufacturer's guidelines for the specific biodispersant product. These guidelines are based on extensive testing and provide a good starting point.
Initial Dosage: As a rule of thumb, initial dosages for biodispersants in cooling towers can range from 50 to 200 ppm. However, this can vary widely based on the specific product and system conditions.
System-Specific Adjustment:
Given your system's total hardness and chloride levels, which are relatively high, you might need a higher initial dosage to effectively manage biofouling. The turbidity level (10 NTU) is also a factor to consider, as it indicates the presence of suspended particles, which could harbor microbial growth.
Trial and Monitoring:
Start with a conservative dosage within the recommended range. Monitor the system closely for changes in parameters like microbial counts, turbidity, and system efficiency. Adjust the dosage based on performance. If biofouling is still evident, gradually increase the dosage until the desired control level is achieved.
Regular Testing: Regular water testing is crucial. Monitor for biological activity, corrosion rates, and other indicators of system health.
Safety and Environmental Compliance: Ensure that the biodispersant and its dosage comply with all relevant safety and environmental regulations.
Final Considerations:
Compatibility: Check the compatibility of the biodispersant with other treatment chemicals used in the system.
Professional Consultation: It’s advisable to work with a water treatment specialist who can analyze your specific system and provide tailored recommendations.
Documentation and Review: Keep detailed records of treatments and their outcomes to refine your approach over time.
Remember, the goal is to use the minimum effective amount of biodispersant to control biological growth while minimizing chemical costs and environmental impact. Regular monitoring and adjustment are key to maintaining an optimal balance.

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