DTRO is a classification of DT. DT membrane technology is Disc Tube Module, which is divided into DTRO (disc type reverse osmosis), DTNF (disc type nanofiltration), DTUF (disc type ultrafiltration). The three categories are a patented membrane separation module. This technology is specially developed for the filtration separation of high-concentration liquids (eg, landfill leachate, zero discharge of wastewater, etc.) membrane products. The DT adopts an open flow channel, and the liquid enters the pressure vessel through the inlet. The treated liquid flows into the deflector at the shortest distance, reverses 180 degrees from one side of the membrane and flows into the other side of the membrane, and then enters the next deflector. Finally, Finally, out the outlet. This special design creates a turbulent flow when the liquid flows through the surface of the membrane and collides with the bumps on the surface of the membrane, increasing the transmission rate and self-cleaning function and prolonging the service life of the membrane.
*Note: The above performance parameters are nominal values. The actual water production of a single membrane module may fluctuate within ±15%.
*** The performance specifications table shows the reference values. The water yield of the single membrane module varies within the range of ± 15% of the stated value. DTRO75 test conditions: 2000mg / L NaCl solution, test pressure 15.5bar15% recovery, PH8@25 °C.
DTRO90 test conditions: 32,000 mg/l NaCl solution, test pressure 55.2 bar.
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CP-DTRO-75 |
CP-DTRO-90 |
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Material |
Polyamide composite anti-contamination film |
Polyamide composite anti-contamination film |
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Number of diaphragms |
209 piece |
209 piece |
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Element structure |
Disc tube, fiberglass housing |
Disc tube, fiberglass housing |
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Membrane area |
9.4㎡（101ft²） |
9.4㎡（101ft²） |
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Influent flow |
500-1000 l/h |
500-1000 l/h |
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Water production |
80-450 l/h |
80-400 l/h |
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Stable salt rejection rate ** |
99% |
99.3% |
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Minimum salt rejection rate |
98% |
98.5% |
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Plate material |
ABS |
ABS |
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System design crossflow |
0.8m³/h@2.8bar ▲p |
0.8m³/h@2.8bar ▲p |
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Maximum pressure drop |
9bar |
9bar |
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Maximum operating pressure |
75bar |
90bar |
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Maximum operating temperature |
40℃ |
40℃ |
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Best operation of the pH range |
6-9 |
6-9 |
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Short-term cleaning pH range |
2-12 |
2-12 |
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Tolerant to residual chlorine |
≤0.1ppm |
≤0.1ppm |
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CP-DTRO-120 |
CP-DTRO-160 |
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Material |
Polyamide composite anti-contamination film |
Polyamide composite anti-contamination film |
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Number of diaphragms |
209 piece |
209 piece |
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Element structure |
Disc tube, fiberglass housing |
Disc tube, fiberglass housing |
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Membrane area |
9.4㎡（101ft²） |
9.4㎡（101ft²） |
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Influent flow |
100-500 l/h |
100-500 l/h |
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Water production |
80-350 l/h |
80-300 l/h |
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Stable salt rejection rate ** |
99.5% |
99.5% |
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Minimum salt rejection rate |
98.5% |
98.5% |
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Plate material |
ABS |
ABS |
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System design crossflow |
0.8m³/h@2.8bar ▲p |
0.8m³/h@2.8bar ▲p |
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Maximum pressure drop |
9bar |
9bar |
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Maximum operating pressure |
120bar |
160bar |
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Maximum operating temperature |
40℃ |
40℃ |
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Best operation of the pH range |
6-9 |
6-9 |
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Short-term cleaning pH range |
2-12 |
2-12 |
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Tolerant to residual chlorine |
≤0.1ppm |
≤0.1ppm |
The flat membrane is assembled on a central tension bar with metal flanges at both ends. The stacked membrane stack is placed in an 8-inch standard high pressure tank that is open at both ends.
The inlet water is sealed by a pressure flange seal. The high pressure tank is designed to allow the membrane length and tube material to be varied at will. The special modular structure facilitates easy and quick access to the membrane for repair and replacement.
The flat membrane stack operates under compensating pressure. The special hydraulic properties ensure safe operation at every pressure stage and maximum pressure drop.
Such hydraulics result in high flow rates through the membrane at a minimum influent flow rate. The open inlet runner on the membrane surface ensures optimum cleaning of contaminated deposits on the membrane surface.
DISC (disc) is made of POM material. The material is also suitable for special influent water quality. The disc is covered on the membrane mat without applying pressure to the membrane surface. The influent water is sealed by the O-ring and the clean water in the center rod. Membrane spacing and water production pipes are designed as part of the disc.
The integrated spacing forms an open inlet channel. The membrane mat is sealed by ultrasonic welding.
A very short influent path passes through the membrane and the water then reverses through 180 degrees to eliminate concentration polarization. As a result, the DT membrane module has the smallest possibility of membrane fouling and contamination.
The produced water is discharged from the middle layer of the membrane mat to the pipeline with minimal water flow passage and minimum resistance.
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Operating conditions of the CP-DTRO |
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Raw water operating pressure |
65-160bar |
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Maximum operating pressure |
≤150bar |
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Pressure drop |
5~6bars/piece |
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Maximum number of membranes in series |
1piece |
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Max. number of module in parallel |
Depend on the flow rate of the booster pump |
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Cross flow of each module |
0.4-1.2 m³/h, depending on water quality |
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Continuous operating temperature |
40℃ |
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Highest temperature tolerance |
＜50℃ |
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raw water flux |
10LMH |
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High pressure stage flux |
5 LMH |
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Raw water stage recovery rate |
70-85% Depending on water quality |
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High pressure stage recovery rate |
25-50% Depending on water quality |