Reverse osmosis system
Introduction:
Reverse osmosis is a membrane separation operation that uses
pressure difference as the driving force to separate solvent from
solution. Because it is in the opposite direction of natural
penetration, it is called reverse osmosis. According to the
different osmotic pressure of various materials, the reverse
osmosis pressure greater than the osmotic pressure can be used,
that is, the reverse osmosis method, to achieve the purpose of
separation, extraction, purification and concentration.
Reverse osmosis membrane is an artificial semi-permeable membrane
with certain characteristics made by simulating biological
semi-permeable membrane, and it is the core component of reverse
osmosis technology. The principle of reverse osmosis technology is
that under the pressure greater than the osmotic pressure of the
solution, other substances can not pass through the semi-permeable
membrane to separate these substances from water. The membrane pore
size of the reverse osmosis membrane is very small, so it can
effectively remove dissolved salts, colloids, microorganisms, and
organic matter in the water. The system has the advantages of good
water quality, low energy consumption, no pollution, simple process
and easy operation.
Reverse osmosis membranes are classified into RO (reverse osmosis)
membranes and NF (nanofiltration) membranes according to different
filter pore sizes.
Application:
1. It is used for the preparation of pure water and high-purity
water. It has been widely used in many industrial fields such as
medicine, chemical industry, electronics, coating, beverage and
medium and high pressure boiler feed water.
2. It is used in the pre-treatment of boilers, thermal power
stations, chemical industry, light industry, textiles, medicine,
biology, electronics, atomic energy and pure water treatment. It
can also be used in the occasions of hard water softening and
deionized water preparation in industrial production.
Decolorization and purification of food and drugs, recovery of
precious metals and chemical raw materials, treatment of
electroplating wastewater, etc.
Equipment description:
1. Two control modes of manual and automatic can be realized. The
trigger conditions of automatic mode are liquid level, flow,
conductivity, running time, etc.
2. There are single-stage and multi-stage design methods, designed
according to specific conditions.
3 There are two operating mechanisms, single-level and
double-level, designed according to specific conditions.
4. Membrane elements with multiple functions and uses, adapted
according to operating requirements.
5. There are single-level pressurization and multi-level
inter-stage pressurization, designed according to water inlet
conditions.
设
Design parameters: (take a conventional single-level two-stage reverse osmosis system
as an example)
Operating pressure | 1.0~1.6Mpa | Inlet water resource | Water produced from pretreatment process |
Inlet water temperature | 5~35℃ | Inlet water total organic carbon | ≤10mg/L |
Inlet water PH | 5~9 | Inlet water residual chlorine | ≤0.01mg/L |
Recovery rate | 75% | Inlet water total iron | ≤0.01mg/L |
Inlet water conductivity
| Best conductivity ≤1000μm/cm | Operation mode | Concentrated water recycling type |
Maximum conductivity≤5000μm/cm(Ordinary brackish water membrane) | Concentrated water direct discharge type |
配套设备
List of corollary equipment (take a conventional single-level two-stage reverse osmosis system
as an example)
Model | (m³/h)
Water production | (mm)
Inlet and outlet water | (mm) Concentrated water | (mm)
Cleaning first-stage
| (mm)
Cleaning second-stage
|
Recovery rate
|
Number of membranes
| (T)
Equipment weight |
Size
(diameter×height)
|
| EDI-10 | 12 | DN40 | DN32 | DN40 | DN32 | 75% | 12 | 1.20 | 7.50×1.30×1.50 |
| EDI-20 | 20 | DN65 | DN32 | DN65 | DN40 | 75% | 18 | 1.60 | 7.50×1.30×1.80 |
| EDI-30 | 30 | DN80 | DN40 | DN80 | DN65 | 75% | 30 | 2.40 | 7.50×1.60×1.80 |
| EDI-40 | 45 | DN100 | DN40 | DN100 | DN80 | 75% | 42 | 3.30 | 7.50×1.60×2.20 |
| EDI-50 | 50 | DN100 | DN40 | DN100 | DN80 | 75% | 48 | 3.70 | 7.50×1.80×2.50 |
| EDI-60 | 60 | DN125 | DN50 | DN125 | DN100 | 75% | 60 | 4.80 | 7.50×2.00×2.80 |
