Errors in chemical dosing are common, but also very preventable. They typically occur when chemical feed pumps are not calibrated correctly or when dosage calculation errors are made. The purpose of the information below is to provide a quick and easy dosage calculation.
Steps To Determine Dosage Parameters:
- Identify the optimum ppm dosage of the appropriate Vitec® antiscalant. This can be determined using the Avista Advisor™ Dosing Report (Example shown in Figure 1).
- Determine the desirable dilution in the chemical day tank (see Figure 2). 10% is the maximum recommended dilution.
- Identify the feedflow rate to the RO system.
- Calculate the dosage using the values determined in Steps 1-3 and the calculation below.
Dosage Confirmation
Using a drawdown assembly (as shown in Figure 3), verify that the proper ml/minute dosage is being delivered to the system.
If there is no drawdown tube, calibrate the pump by placing the pump suction line into a graduated cylinder filled with the solution to be pumped. Measure the drop in solution over a one-minute period to verify the ml per minute injection rate. Adjust the pump accordingly until it is correct.
The Avista Advisor computer program is available to recommend and dose Vitec antiscalants based on site specific feedwaters.
|
|
|
