GOLDTONâ„?Antiscalant Users' Manual 
Application
1. Feed point
For maximum effectiveness, antiscalant should be added prior to the static mixer or cartridge filter housing. Feed pump should be calibrated. Antiscalant should be added continuously and directly proportional to feed water flow.
For specific questions, please consult GOLDTON CHEM. local technician.
2. Dosing
Typical dosage is the amount of standard liquid product needed for per unit of feed water flow.
GOLDTON CHEM. can provide Dosage Projection Software, which can calculate the recommended dosage required based on the salt content, temperature and other aspects of feed water quality as well as on the operating conditions of RO system and types of membranes used.
3. Preparation of treatment solution
Antiscalant can be fed neat or diluted. Maximum dilution is 10% with RO permeate or DI water.
The following methods can be used to help decide exact dosage.
· Method 1
Calibrate and ascertain feed pump rate. The first step is to calculate the concentration of treatment solution based on recommended dosage and feed flow. Based on the volume of the treatment solution, calculate the amount of antiscalant required.
Concentration of treatment solution (g/L) = antiscalant required per unit time (g/h)/feed pump rate (L/h)
Where antiscalant required per unit time (g/h) =feed flow (T/h) * desired ppm of antiscalant (g/T, ppm).
Total amount of antiscalant needed per treatment (kg) = solution concentration (g/L)*solution volume (L)/1000 (g/kg)
· Method 2 How to calculate feed pump rate
Treatment solution concentration (g/L) = total amount of antiscalant/per treatment (kg)/ solution volume (L) * 1000 (g/kg)
Feed pump rate (L/h) = antiscalant required per unit time (g/h)/ solution concentration (g/L)
Where antiscalant required per unit time (g/h) =feed flow (T/h) * desired ppm of antiscalant (g/T, ppm).
Example:
Assume a RO system of 100T/h with a recovery ratio of 75%. Then the system has a feed flow of 133.33T/h. Assume the recommended dosage is 3ppm. Therefore, antiscalant required per unit time= 133.33T/h * 3(g/T) =400g/h.
Method 1: Adjust feed pump rate to 2L/h. Total antiscalant required for 1000L treatment solution:
Treatment solution concentration= 400 (g/h)/2(L/h) =200g/L
Total antiscalant required= 200g/L *1000L/ (1000g/kg) =200kg.
Method 2: To get 1000L treatment solution with 200kg of antiscalant, calculate the feed pump rate:
Treatment solution concentration = 200kg/1000L * 1000g/kg=200g/L
Feed pump rate (L/h) = 400 (g/h)/200(g/L) = 2L/h
Note: The above-mentioned calculation methods are for standard liquid. For concentrated liquid, the calculations can be adjusted according to the extent of concentration. For example, for 8-times concentrated liquid, such as GOLDTONâ„?GTCâ„?P1800, the amount of antiscalant needed is 25kg (which is equivalent to 200kg of standard liquid).
Professional Advices
1. High content of salt and iron oxides in feed water will cause scales on membrane surface. Periodic removal of scales is necessary or else scales will result in high pressure differential in the RO system which can damage membrane surface.
2. Please make sure that the compatibility of antiscalant with coagulant. Incompatibility will blind the membrane.
3. Over and under-dosing may cause membrane fouling.
4. When storage temperature falls below specified freezing point, antiscalant will be frozen. In such a case, it should be unfrozen completely and stirred uniformly so as to ensure the accuracy of dosage.
Safety Precautions
Before use, please read carefully product’s label and Material Safety Data Sheets (MSDS) which contain detailed information about the products. |
