Chemical Dosing Pump For RO Plant – Precision Antiscalant, Acid & Dechlorination Injection
In reverse osmosis (RO) plants, even minor chemical dosing errors can lead to membrane scaling, fouling, or irreversible damage-causing costly downtime and reduced water recovery. Our chemical dosing pump for RO plant delivers ultra-precise, pulse-free, and maintenance-friendly feed of antiscalants, acid (for pH adjustment), and dechlorination agents (like sodium bisulfite). Engineered for low-flow accuracy (as low as 0.5 L/h) and seamless integration with RO skids, our metering pumps protect your membranes and maximize system efficiency-trusted by desalination plants, power stations, food processors, and industrial facilities worldwide.
Specification
Flow: 0-240 lph
Pressure: 0-8 Bar
Power: 370W, 220V/380V/400V/110V, 50/60Hz
Drive System: Two and three phase motor,Anti-explosion motor
Frequency conversion motor
Flow Control: Manual operation
Material
Pump head: SUS304, SUS316, PVC, PTEF
Diaphragm: PTFE
Valve: SUS304, SUS316, PVC, PTEF
Valve ball: ZrO2, SUS304, SUS316, Ceramic
Work Condition
Protection degree: IP55
Why Standard Pumps Fail in RO Applications-And Ours Don't
RO plants demand a unique dosing performance that generic metering pumps can't deliver:
* Extreme Low-Flow Accuracy: ±1% precision at flows as low as 0.5 L/h-critical for antiscalant dosing in small commercial RO units.
* Pulse Dampening Technology: Minimizes pressure spikes that can damage sensitive RO membranes.
* Gas-Lock Prevention: Special venting design for sodium bisulfite and other gas-generating chemicals.
* Chemical Compatibility: Wetted parts in PVDF, PTFE -resistant to antiscalants, sulfuric acid, and bisulfite solutions.
* Compact & Skid-Mount Ready: Designed to fit directly onto OEM RO frames without modification.
* 4–20mA / Modbus Integration: Synchronizes dosing with RO feedwater flow for proportional chemical feed.
Chemicals Used in RO Pretreatment & Their Dosing Requirements
| Chemical | Purpose | Dosing Challenge | Our Pump Solution |
|
Antiscalants (e.g., phosphonates, polyacrylates) |
Prevent CaCO₃, CaSO₄, silica scaling | Very low dose (2–5 ppm); viscous concentrates | Solenoid pump with PTFE diaphragm; flow calibration down to 0.5 L/h |
| Sulfuric Acid (H₂SO₄) or Hydrochloric Acid (HCl) |
Lower pH to reduce LSI and prevent carbonate scaling | Corrosive; requires inert materials | PVDF pump head + PTFE diaphragm; leak-proof design |
| Sodium Bisulfite (NaHSO₃) | Remove residual chlorine to protect polyamide membranes | Generates SO₂ gas → causes air lock | Pump with automatic degassing valve and oversized suction line |
Recommended Dosing Pump Types for RO Applications
1. Solenoid-Driven Metering Pumps (Most Common for RO)
Ideal For: Antiscalant, acid, and bisulfite dosing in commercial & industrial RO systems.
Key Features:
- Flow range: 0.5 – 20 L/h
- Max pressure: 10–16 bar (matches RO feed pressure)
- Built-in stroke length & frequency control
- Optional pulsation dampener
2. Motor-Driven Diaphragm Pumps (For Large-Scale RO/Desalination)
Ideal For: High-recovery seawater RO plants requiring stable, continuous feed.
Key Features:
- Flow range: 5 – 500 L/h
- Smooth, pulse-minimized output
- VFD speed control for variable flow plants<br>
Use Case: 10,000 m³/day desalination facility in the Middle East
Technical Data
| Type | Flow (L/H) | Pressure (MPA) | Power (KW) | Caliber (DN) |
| GM30L/1.0MPA | 30 | 1 | 0.37 | DN15 |
| GM50L/0.8MPA | 50 | 0.8 | 0.37 | DN15 |
| GM90L/0.8MPA | 90 | 0.8 | 0.37 | DN15 |
| GM120L/0.8MPA | 120 | 0.8 | 0.37 | DN15 |
| GM170L/0.7MPA | 170 | 0.7 | 0.37 | DN15 |
| GM240L/0.5MPA | 240 | 0.5 | 0.55 | DN15 |
| GM300L/0.5MPA | 300 | 0.5 | 0.55 | DN15 |
| GM400L/0.5MPA | 400 | 0.5 | 0.55 | DN15 |
| GM500L/0.5MPA | 500 | 0.5 | 0.55 | DN15 |
| GM600L/0.3MPA | 600 | 0.3 | 0.75 | DN25 |
| GM800L/0.2MPA | 800 | 0.2 | 0.75 | DN25 |
| GM1000L/0.1MPA | 1000 | 0.1 | 0.75 | DN25 |
| Type | Flow (L/H) | Pressure (MPA) | Power (KW) | Caliber (DN) |
| JX5L/10MPA | 5 | 10 | 0.55 | DN20 |
| JX20L/4MPA | 20 | 4 | 0.55 | DN20 |
| JX50L/4MPA | 50 | 4 | 0.55 | DN20 |
| JX100L/2.4MPA | 100 | 2.4 | 0.75 | DN20 |
| JX150L/2.0MPA | 150 | 2.0 | 0.75 | DN20 |
| JX200L/1.3MPA | 200 | 1.3 | 1.1 | DN20 |
| JX300L/0.8MPA | 300 | 0.8 | 1.5 | DN25 |
| JX400L/0.5MPA | 400 | 0.2 | 1.5 | DN25 |
Flow Components Material
| Material | Acids | Alkali class | Mucus and grout | Acid kind | Solvent |
| Pump Head | PPG/PVC | PPG/PVC | PPG/PVC | PVDF/PTFE | SUS316/304 |
| Ball Valve | Ceramic | Ceramic | SUS316 | Ceramic | SUS316/304 |
| Ball Seat | PPG/PVC | PPG/PVC | PPG/PVC | PVDF/PTFE | SUS316/304 |
| O-rings | Fluorine rubber | Fluorine rubber | EPDM | Fluorine rubber | -- |
| Diaphragm | PTFE+NBR | ||||
| Typical Cases | ① Acids: Sulfuric acid, Hydrochloric acid, hypochlorous; ② Alkali class: Hydrogen oxidation ③ Mucus and grout: PAC, PAM ④ Acid kind: Sulfuric acid, Hydrofluoric acid ⑤ Solvent: Organic solvent |
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Built for RO Skid Integration – Out of the Box
Our dosing pumps are designed to work seamlessly with major RO system manufacturers (DOW/FilmTec, Hydranautics, Toray, Pentair):
* Mounting brackets compatible with standard RO frame rails
* Pre-wired terminals for easy connection to RO PLC or local control panel
* Optional accessories:
- Back-pressure valve (prevents siphoning)
- Calibration column (for field verification)
- Pulsation dampener (protects membrane elements)
Specialists in RO Chemical Dosing – Not Just Pump Sellers
We've supplied over 5,000+ dosing pumps to RO systems since 2001. Every recommendation is based on:
* Your feedwater analysis (hardness, silica, chlorine, pH)
* RO system size and recovery ratio
* Chemical type and concentration
* Local environmental conditions (temperature, humidity)
We Also Offer:
* Free dosing calculation support (ppm → L/h conversion)
* Pump sizing tool and compatibility checklist
* Global spare parts network – diaphragms shipped in 48h
* 24-month warranty against manufacturing defects
Frequently Asked Questions
Q1: How do I calculate the required antiscalant dosing rate for my RO system?
A: Typical antiscalant dose is 2–5 ppm based on feedwater flow. For example:
- Feed flow = 10 m³/h (10,000 L/h) - Dose = 3 ppm = 3 g/m³
- If antiscalant concentration = 100% active, you need 30 g/h ≈ 0.03 L/h (assuming density ～1 kg/L).
We provide a free dosing calculator spreadsheet upon request.
Q2: Can I use the same pump for both acid and sodium bisulfite?
A: No-never share a pump between oxidizing and reducing agents. Mixing residues can cause dangerous reactions. We recommend dedicated pumps with clearly labeled lines. Our RO skid packages include dual-pump options with color-coded tubing.
Q3: Do you offer explosion-proof models for offshore RO platforms?
Yes. For marine, oil & gas, or hazardous locations, we supply ATEX/IECEx-certified solenoid pumps with intrinsically safe electronics (Zone 1/2).
