1m³ Per Hour RO Water Treatment Plant For Medicine / Irrigation / Purified Water
Before doing the reverse osmosis equipment process design, we should first determine the process flow, the recovery rate of each process
part and the amount of water treated, which is the basis of the entire process design.
Generally, the recovery rate of each major process is as follows, which can be adjusted according to different water quality conditions.
Ultrafiltration 90-95%
Primary reverse osmosis 75%
Secondary reverse osmosis 85%
The raw water is groundwater, with a conductivity of 1000 s/cm and a yield of 100t/h after pretreatment.
Dow BW30-400 film (film area 37.2m2)
1. It is designed as 2 sets with a single set of water yield of 50 t/h
Single inflow water = yield/recovery: 50/0.75=67t/h
Predicted water yield conductivity = raw water conductivity × (1-desalination rate) : 1000× (1-98%) =20 s/cm
2. The designed membrane flux was 27 L/ M2H
Single membrane yield (m3/h· branch) = membrane flux (L/ M2H) × membrane area (m2) /1000=27×37.2/1000=1.0 m3/h· branch
The number (branches) of a single sheath = water yield of a single sheath (m3/h)/water yield of a single sheath (m3/h· branches) =50/1=50
The reverse osmosis design software is used to bring in water quality, water quantity and the number of films to be used for simulation. If the
design is not reasonable, the software will give an alarm and adjust the number of films, the proportion of membrane shell in 1 or 2 sections,
or increase the inter-section pump, etc.
If the final number of membrane shells is determined to be 6 in one section and 3 in two sections, the total number of membrane shells is 2×9
per set, 2×54 membrane elements per set, and the membrane flux is 25 L/ m2H.
3. If secondary reverse osmosis is designed, the design method is the same as above.
However, the membrane flux is relatively high, generally 35-50 L/ m2H or even 60 L/ m2H.
The arrangement mode of membrane shells is usually 2 sections, the number of membrane shells in 1 section is ≈ 3:1, and 4 cores are
commonly used except for the large scale of the system
Because the reverse osmosis membrane has poor effect on the removal of dissolved gas in the water, and the water is treated by reverse
osmosis, the effluent is acidic, and the HCO3- in the raw water turns into free CO2 again, thus causing the carbon dioxide in the water to have
a certain influence on the conductivity of the effluent.
However, the dissolved gases CO2 and O2 in the molecular state of natural water are the main causes of metal corrosion.
Therefore, degassing is needed to remove most of the CARBON dioxide in the pure water of primary reverse osmosis.
When the secondary desalting process is the traditional ion exchange method, the carbon eliminator is usually used as the degassing device,
which can reduce the exchange capacity of the negative resin and even the consumption of the regenerated alkali.
For the two-stage reverse osmosis process, it is usually more economical and reasonable to set alkali addition devices between stages when
CO2 is not very high, so as to improve the pH value of reverse osmosis water production and remove CO2 from water.
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