CP119 RO Scale Inhibitor Performance Test Report

Experimental background

There has been a change in the raw water quality of a CITIC Envirotech water treatment plant. As a professional manufacturer of water treatment chemicals, EcoLan used its expertise in chemicals (reverse osmosis scale inhibitors) and provincial laboratory to conduct this scale inhibition performance test on CP119 used in the reverse osmosis system of the water plant. The test aimed to determine whether the scale inhibition of the CP119 scale inhibitor could meet the current water quality.

Water quality analysis data

Index UF product water(sample)
pH value 7.85
Conductivity (μs/cm) 4720.00
Turbidity (NTU) 0.11
M- Alkalinity (as CaCO3sub, mg/L) 640.39
Total hardness (as CaCO3, mg/L) 128.00
Calcium hardness (as CaCO3, mg/L) 64.00
Magnesium hardness (as CaCO3, mg/L) 64.00
Chloride (as Cl-, mg/L) 391.33
All Iron (as Fe, mg/L) 0.05
Fluoride (as F-, mg/L) 0.78
COD (ppm) 107.00
SiO3 (as SiO3, mg/L) 11.00
Sulfate (as SO42- , mg/L) 1193.18

Water quality analysis data

Experimental instruments

Perkin Elmer AA900T Atomic absorption spectrometer (for testing Ca2+ concentration data)

Experimental instruments

Hach DR6000 UV-Visible spectrophotometer (for testing SiO2 concentration data)

Experimental procedures

Based on the actual measured values of raw water from the CITIC Envirotech water treatment plant, a simulated concentrated water sample was prepared to investigate the scale-inhibiting performance of different agents with different alkalinity.

Add about 400ml of water into a 500ml volumetric flask, add a specific mass concentration of Ca2+ and Mg2+ mixture to make the theoretical value of Ca2+ and Mg2+ 100ppm, shake well, and add 5ppm of scale inhibitor CP121/CP119, shake well, add a specific mass concentration of NaHCO3 aqueous solution to make the theoretical value of alkalinity 700/900ppm.

After stirring well, add a specific mass concentration of Na2SO4 aqueous solution to make the theoretical value of SO42-4800ppm, stirring well and slowly add a specific mass concentration of Na2SiO3 aqueous solution to make the theoretical value of SiO2 about 44ppm, make up the volume with water to 500ml, adjust the pH to 8.6-8.8, take out 50ml and keep it for index test. The rest of the volume was sealed and left for 4H.

Experimental pictures

Observe the phenomenon of the test solution and make a photographic record.

Pre-experiment

Post-experiment

Experimental phenomena

Six water samples were left for 4 hours. There was no visible scaling to the naked eye.

Experimental data

The concentrations of Ca2+ and SiO2 were tested before and after the solutions, and the data are as follows.

Solution Index
CP121 CP121 CP121 CP119 CP119 CP119
Ca2+ concentration(ppm), initial value 101.3 104.6 102.25 103.95 102.8 105.8
Ca2+ concentration(ppm), 4 hours later 101.05 102.85 102 102.2 102.7 105.6
CaCO3 scale inhibiting rate 99.75% 98.33% 99.76% 98.32% 99.90% 99.81%
SiO2 concentration(ppm), initial value 36 37 35 36 35 35
SiO2 concentration(ppm), hours later 34 32 31 34 31 32
SiO2 scale inhibiting rate 94.44% 86.49% 88.57% 94.44% 86.11% 88.88%
Measured alkalinity(ppm) 760 943 758 762 951 752
Measured pH 8.63 8.69 8.71 8.63 8.73 8.67

Experimental conclusion

Scale inhibitor CP119P in simulated water samples of RO concentrated water from the CITIC Envirotech water treatment plant showed good scale inhibition of calcium carbonate ≥98% and silica ≥85%.

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