Dear Rajeev,

The attached publication entitled " EVALUATION OF REVERSE OSMOSIS SCALING

PREVENTION DEVICES AT HIGH RECOVERY" may be helpful.

In addition, the following link contains an important information on the use of 

Reverse Osmosis Membrane Scale Inhibitors & RO Antiscalants

http://reverseosmosischemicals.com/reverse-osmosis-chemicals/ro-membrane-scale-inhibitors

Hoping this will be helpful,

Rafik

Thanks Sir for good information,I want to know the testing parameters for Antiscalants for quality evaluation purposes.

Try it in an easy way. The purpose of the antiscalant is recover the flow properties of the membranes system, so if you compare the flows (reject and product fixed volumes in your setting operation time) with one and another type you will find this is the major indicator of performance. As secondary criteria (but also important) you could consider the contact time and the remotion time of the chemicals, the remotion tell you a lot  about how much water you will spend cleaning the system which obviously is a good performance indicator, you want produce water not waste it.Greetings.

Dear Rajeev,

Testing parameters for Antiscalants for quality evaluation purposes

The RO feed, permeate, and concentrate are analyzed for trace metals (Al, As,

Ba, Fe, Mn, Sr), cations (Ca, Mg, Na, and K), anions (F, NO3, and SO4), TDS, alkalinity, hardness, and silica. All water quality samples are filtered through a 0.45 µm cellulose acetate membrane (0.45 µm HA, Millipore, Mass) to separate precipitated and colloidal solids from dissolved species. All membranes, retentates, and filtrates are preserved for documentation and further analysis.

Free and total chlorine is measured using Standard Method 4500-Cl G (APHA,

AWWA, and WEF 1998). For all free chlorine samples, 200 µl of 0.03 N thioacetamide solution per 10 mL of sample is added to control for interference by monochloramine.

For more information, please use the following link:

https://www.usbr.gov/research/AWT/reportpdfs/report085.pdf

Hoping this will be helpful,

Rafik