Understanding reverse osmosis equipment standards is essential for making more rational choices in water treatment systems.
With the continuous increase in demand for industrial water, wastewater reuse, natural water purification, and high-purity water preparation, reverse osmosis technology has become one of the important technologies in modern water treatment systems. When purchasing equipment, many users often pay more attention to treatment capacity, price, and membrane brand, while easily overlooking whether the equipment is designed, manufactured, tested, and operated in accordance with corresponding standards. In fact, a complete reverse osmosis system includes not only reverse osmosis membrane elements, but also raw water pretreatment, high-pressure pumps, pressure vessels, pipelines, instruments, automatic control systems, and concentrate discharge or reuse systems. Therefore, determining whether the equipment is suitable for a project cannot be based solely on a single component, but should be comprehensively considered from multiple aspects such as equipment classification, performance parameters, structural safety, test methods, and actual water quality conditions. This article will focus on reverse osmosis water treatment equipment standards, systematically introducing the definition, classification, main technical requirements, and test methods of the equipment, providing a reference for the selection of industrial water treatment projects.
I. What Is Reverse Osmosis Water Treatment Equipment?
Reverse Osmosis (RO) is a water treatment technology that utilizes pressure to drive separation through a semi-permeable membrane. Reverse osmosis membranes have selective permeation characteristics. Under certain pressure conditions, water molecules can pass through the membrane, while some dissolved salts, inorganic substances, organics, colloids, and other impurities in the water are retained on the concentrate side, thereby achieving the separation of water from dissolved substances. Unlike ordinary filtration, which mainly removes suspended solids, the RO system primarily targets dissolved substances and ions in the water, and therefore usually needs to be combined with pretreatment processes such as sand filtration, activated carbon filtration, security filtration, and ultrafiltration. For example: Raw Water → Pretreatment → Security Filtration → High-Pressure Pump → RO Membrane System → Permeate/Concentrate Reasonable pretreatment can reduce the impact of suspended solids, colloids, organics, and microorganisms on the membrane surface, thereby reducing membrane fouling and scaling risks. In actual industrial projects, reverse osmosis systems can be used for natural water purification, industrial water preparation, industrial wastewater reuse, and other water treatment scenarios where salinity needs to be reduced. The attached documents also point out that this type of equipment can be applied to industrial wastewater and municipal sewage purification and reuse, as well as the purification and desalination of general natural water, among other fields.
II. What Are Reverse Osmosis Water Treatment Equipment Standards?
The so-called reverse osmosis water treatment equipment standards are mainly used to regulate terms and definitions, classification and models, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation, and storage of related equipment. For equipment purchasers, the significance of standards lies not only in judging whether the equipment is "qualified", but also in helping users review equipment design schemes from multiple dimensions. For example, an industrial RO system usually needs to focus heavily during design on:
Raw water quality
Designed treatment capacity
Permeate production rate
System recovery rate
Operating pressure
Operating temperature
Effluent water quality
Membrane element configuration
Pretreatment process
High-pressure pump parameters
Automatic control mode
Safety protection measures
Equipment operation and maintenance conditions
The attached documents list two standards: GB/T 19249-2017 "Reverse Osmosis Water Treatment Equipment" and HJ/T 270-2006 "Technical Requirements for Environmental Protection Products - Reverse Osmosis Water Treatment Devices", and explain their scope of application. In actual projects, applicable regulations, standards, and technical specifications should also be confirmed according to the country or region of the project, industry requirements, raw water quality, and final water use standards, rather than judging solely by the equipment name.
III. What Are the Classifications of Reverse Osmosis Water Treatment Equipment?
The raw water quality and final water use requirements of different projects vary greatly, so there is no fixed configuration of RO systems applicable to all projects. The attached documents classify equipment into Class A, Class B, and Class C according to their application purposes.
Class A: Natural Water Purification and Desalination
Class A is mainly used for the purification and desalination of general natural water, and can be used for drinking water and industrial water preparation. For groundwater, surface water, or other natural water sources, system design usually needs to determine the pretreatment scheme combined with water quality indicators such as hardness, TDS, turbidity, iron and manganese, and organics.
Class B: Industrial Wastewater and Municipal Sewage Reuse
Class B is mainly used for the purification and reuse of industrial wastewater and municipal sewage. Such projects usually pay more attention to pollutant loads, membrane fouling, concentrate treatment, and long-term system operating stability. For industries such as textile, electronics, electroplating, food, and chemical engineering, RO is often an important unit in advanced wastewater treatment and reuse systems.
Class C: Special Purpose Water Treatment
Class C is mainly used for special water treatment needs, such as ultrapure water preparation, seawater desalination, and pharmaceutical water. For industries such as electronics, laboratories, and pharmaceuticals, relying solely on RO may not achieve the final water quality requirements, and therefore further configuration of EDI, ion exchange, or other advanced treatment units is usually required.
IV. What Are the Differences Between Different RO System Models?
In addition to classification by purpose, the attached documents also list different combination forms from Model 1 to Model 10.
Model 1: Single-Stage RO System
It has only one reverse osmosis membrane element, suitable for application scenarios with relatively good water quality and relatively moderate treatment requirements.
Model 2: Two-Stage RO System
It adopts a two-stage reverse osmosis structure, where the concentrate of the first stage serves as the feed water for the second stage, suitable for occasions with poor raw water quality or high requirements for permeate quality.
Model 3: RO + NF
It consists of one stage of reverse osmosis and one stage of nanofiltration, suitable for applications where water contains more organic matter and trace elements.
Model 4: RO + Electrodialysis
It consists of one stage of reverse osmosis and one stage of electrodialysis, suitable for scenarios where water contains more ions and salts.
Model 5: RO + UF
It consists of one stage of reverse osmosis and one stage of ultrafiltration. When raw water contains more suspended solids and colloids, ultrafiltration can serve as an important membrane pretreatment link.
Model 6: RO + MF
It consists of one stage of reverse osmosis and one stage of microfiltration, suitable for water treatment scenarios containing more particles and bacteria.
Model 7: RO + EDI
It consists of one stage of reverse osmosis and one stage of EDI, mainly used for ultrapure water preparation. In actual industrial pure water projects, RO is responsible for most salt removal, while EDI further reduces ion content, thereby obtaining higher quality permeate.
Model 8: RO + CDI
It consists of one stage of reverse osmosis and one stage of CDI, which can be used for ultrapure water preparation.
Model 9: RO + MBR
It consists of one stage of reverse osmosis and one stage of MBR, suitable for high-concentration organic wastewater treatment. It should be noted that MBR and RO solve different types of problems. MBR mainly removes organic pollutants and suspended solids through biological treatment and membrane separation, while RO further undertakes advanced desalination and water quality enhancement functions.
Model 10: Two-Stage RO Combination
This system sets up two reverse osmosis membrane elements, where the concentrate of the first stage enters the second stage, while the concentrate of the second stage is recirculated to the first stage, mainly used for treatment under specific water quality conditions. The attached documents point out that this model is suitable for situations where water contains higher silicates. Therefore, in actual engineering, the reverse osmosis system configuration should be jointly determined by raw water quality, target permeate water quality, designed water volume, and recovery rate, rather than simply selecting a certain fixed model.
V. What Technical Parameters Should Reverse Osmosis Equipment Focus On?
When selecting industrial reverse osmosis equipment, one cannot simply look at "how many tons per day", but also needs to comprehensively analyze multiple operating parameters.
1. Permeate Production Rate
Permeate production rate is an important indicator for evaluating system treatment capacity. For example, when users need a 20 T/D, 50 T/D, or 100 T/D system, it is necessary to calculate the design flow rate based on the actual daily operating hours of the equipment, rather than simply equating the daily permeate volume directly to the instantaneous flow rate of the membrane system.
2. Recovery Rate
Recovery rate indicates what proportion of the raw water entering the system is converted into permeate. Generally speaking, increasing the recovery rate can reduce concentrate discharge, but at the same time it may increase the concentration multiple on the membrane surface, thereby increasing the risk of scaling and fouling. Therefore, the RO system recovery rate needs to be designed based on raw water TDS, hardness, alkalinity, silica, and other scaling ions.
3. Operating Pressure
RO belongs to pressure-driven membrane separation technology. Operating pressure needs to be determined based on factors such as membrane type, raw water osmotic pressure, water temperature, target permeate production rate, and membrane flux. If the pressure is insufficient, it may lead to a decrease in permeate production; if the pressure is too high, it may increase energy consumption and equipment load.
4. Effluent Water Quality
Whether the equipment is suitable ultimately needs to return to the user's actual water use requirements. Different projects have different requirements for permeate conductivity, TDS, hardness, silica, and other indicators. For example, ordinary industrial water and pure water for the electronics industry do not have the same requirements for water quality, so the system configuration cannot be completely identical.
5. Operating Temperature
Temperature affects water viscosity and membrane system permeate performance. Under the same pressure, when the water temperature changes, the actual permeate production rate of the membrane may also change. Therefore, engineering design cannot be estimated solely based on normal temperature conditions, and the actual on-site temperature range must be considered. The attached documents list permeate volume, effluent quality, recovery rate, operating pressure, operating temperature, operating current, operating voltage, and operating power as important contents of equipment performance requirements.
VI. Why Does the RO System Require Pretreatment?
In a complete reverse osmosis system, pretreatment is not an optional auxiliary equipment, but an important link to protect the RO membrane. If the raw water contains a large amount of suspended solids, colloids, hardness ions, organics, or microorganisms, entering the membrane element directly may cause:
Membrane fouling
Membrane scaling
Pressure drop increase
Permeate production decrease
Desalination rate decrease
Cleaning frequency increase
Membrane element service life shortening
Therefore, according to different raw water conditions, pretreatment processes such as multimedia filtration, activated carbon filtration, softening, ultrafiltration, security filtration, and chemical dosing systems can be selected. For high-hardness water sources, it is also necessary to focus on evaluating potential scaling substances such as calcium carbonate, calcium sulfate, and silica. For water sources containing high organic matter or colloids, the risks of organic fouling and colloidal fouling should be focused on. This is why professional reverse osmosis water treatment equipment selection must be based on raw water quality analysis, rather than simply quoting prices directly according to the client's request of "needing an RO equipment".
VII. Equipment Structure and Safety Requirements Are Equally Important
In addition to membrane system performance, equipment structure is also an important part of standard requirements. A complete industrial RO device usually includes: Pretreatment System + Security Filter + High-Pressure Pump + RO Membrane Element + Pressure Vessel + Instrument System + Automatic Control System + Permeate System + Concentrate System For projects with a high degree of automation, a PLC control system can also be configured to realize monitoring of pressure, flow rate, conductivity, water tank liquid level, and equipment operating status. Equipment structural design also needs to pay attention to pipeline connections, equipment support, sealing, anti-corrosion, anti-vibration, anti-freezing, and safety requirements under specific environments. The attached documents also list equipment layout, installation, connection, support, sealing, anti-corrosion, anti-vibration, anti-freezing, and explosion-proof as structural requirements, and incorporate safety protection, safety signs, safety operation, and safety maintenance into safety requirements. Therefore, when purchasing equipment, one cannot focus only on the membrane brand and equipment appearance; complete engineering design and safety configuration are equally important.
VIII. How Is Reverse Osmosis Equipment Tested?
According to the attached documents, relevant tests mainly include three aspects: type testing, ex-factory testing, and on-site testing.
Type Testing
Type testing mainly conducts comprehensive inspections on equipment performance, structure, safety, and environment, and is used to verify whether the equipment meets design requirements and relevant standard requirements.
Ex-Factory Testing
Before the equipment leaves the factory, its performance, structure, and safety aspects need to be checked to confirm that the equipment is in normal operating and delivery conditions. For purchasers, ex-factory test data can serve as an important reference for equipment acceptance and subsequent commissioning.
On-Site Testing
After equipment installation is completed, debugging and inspection need to be carried out in combination with actual on-site conditions. The value of on-site testing lies in verifying the actual operating status of the equipment, including whether operating pressure, flow rate, permeate quality, and automatic control meet project design requirements. The attached documents explicitly define on-site testing as relevant inspections conducted at the user unit after equipment installation and commissioning are completed.
IX. How to Choose a Suitable RO System for Yourself?
For actual projects, "meeting standards" is only the foundation; what truly matters is whether the equipment can match the specific water quality and application scenarios. Before selecting industrial reverse osmosis equipment, it is recommended to prepare the following basic data:
Raw Water Information
Raw water source
TDS
Conductivity
pH
Turbidity
Hardness
Alkalinity
Silica
Iron and manganese
COD and organics
Microbial conditions
Project Requirements
Designed treatment capacity
Daily operating hours
Target permeate volume
Target permeate water quality
System recovery rate
Concentrate treatment method
Whether automatic operation is required
Whether remote monitoring is required
For complex industrial projects, comprehensive design also needs to be combined with on-site space, power supply conditions, ambient temperature, and subsequent maintenance capabilities. This is also an important difference between industrial reverse osmosis equipment selection and ordinary standardized equipment procurement.
X. How ECOLINK TECHNOLOGY Provides Water Treatment Solutions
ECOLINK TECHNOLOGY focuses on water treatment chemicals and water treatment equipment, providing clients with product matching, technical support, and one-stop service. For different project requirements, we can perform combined designs of RO, UF, EDI, and other water treatment units according to raw water conditions and final water use requirements. For example, for projects requiring the preparation of higher quality industrial water, the following can be considered: Raw Water → Pretreatment → UF → RO → EDI → Terminal Pure Water For industrial wastewater reuse projects, design can be carried out according to pollutant characteristics: Wastewater Treatment → Advanced Treatment → RO → Reuse Water System For projects in different countries and regions, adjustments must also be made in combination with local water quality, regulations, energy conditions, and operation and maintenance habits. ECOLINK TECHNOLOGY pays more attention to "product matching + technical support + project service" rather than simply selling a single piece of equipment. Through preliminary water quality analysis, equipment configuration, technical parameter confirmation, data support, and after-sales service, we help clients build a water treatment system more suitable for actual working conditions. If you are looking for a reverse osmosis water treatment equipment supplier, or are planning industrial pure water, wastewater reuse, seawater desalination, and other desalination projects, you can provide raw water quality, treatment capacity, and target permeate indicators, and we can further analyze equipment configuration based on actual working conditions.
XI. Conclusion
Reverse osmosis technology has been widely used in natural water purification, industrial water preparation, wastewater reuse, seawater desalination, and high-purity water systems. Understanding relevant equipment standards helps purchasers make more comprehensive judgments from aspects such as equipment classification, system structure, performance parameters, safety requirements, and test methods. However, in actual engineering, standards cannot replace project design. A truly rational reverse osmosis water treatment system needs to be comprehensively designed in combination with raw water quality, treatment capacity, target permeate water quality, recovery rate, operating pressure, membrane fouling risk, and subsequent maintenance conditions. For industrial projects requiring long-term stable operation, choosing appropriate equipment configuration, complete pretreatment, and reasonable operation control are also important factors to ensure system performance. ECOLINK TECHNOLOGY is committed to providing global clients with water treatment solutions that better match actual working conditions through water treatment chemicals, membrane treatment equipment, and technical services.
