Secondary Reverse Osmosis Precision Filtration Reduces Salinity and Explosion-proof Water Filtration Equipment
Product description
Technical Analysis of Secondary Reverse Osmosis Precision Filtration Salt Reduction and Explosion proof Water Treatment Equipment
1、 System core positioning and application scenarios
This equipment is a special water treatment system that integrates “secondary reverse osmosis deep desalination+precision filtration+explosion-proof design”, designed specifically for high salt, flammable and explosive environments (such as chemical workshops, oil and gas fields, pharmaceutical explosion-proof areas). It can not only reduce the salt content (TDS) in water to extremely low levels (≤ 10mg/L), but also meet the safety regulations of explosion-proof areas (such as Ex d Ⅱ CT4 explosion-proof level), ensuring stable operation in potentially explosive gas environments.
2、 System architecture and process flow
plaintext
Raw water → Explosion proof pretreatment system (mechanical filtration+activated carbon filtration+precision filtration) → First stage reverse osmosis (explosion-proof type) → Intermediate water tank → Second stage reverse osmosis (explosion-proof type) → Pure water tank → Explosion proof water supply pump set
1. Explosion proof pre-treatment system (dual guarantee of safety and purification)
Explosion proof mechanical filter:
Material: 316L stainless steel (corrosion-resistant), filter material is quartz sand (0.8-1.2mm), removing large particle impurities such as sediment and rust (particle size ≥ 20 μ m), turbidity is reduced from 20NTU to ≤ 5NTU.
Explosion proof design: Valves and motors adopt explosion-proof type (Ex d Ⅱ CT4), with a sealed structure to prevent spark leakage.
Explosion proof activated carbon filter:
Filter material: Coconut shell activated carbon (specific surface area ≥ 1000m ²/g), capable of adsorbing residual chlorine (removal rate>99%), organic matter, and flammable and explosive volatile substances (such as benzene derivatives), to avoid reacting with RO membranes or forming explosive mixtures.
Safety control: Equipped with explosion-proof differential pressure transmitter, real-time monitoring of filter blockage status (automatic alarm for pressure difference>0.05MPa).
Explosion proof precision filter:
Filter element: 5 μ m explosion-proof folding filter element (material compatible with explosion-proof environment), intercepting fine particles (5-20 μ m) remaining after pretreatment, making the inlet SDI ≤ 3, and protecting the RO membrane.
Structure: Quick opening explosion-proof shell, easy to replace filter element, avoiding static sparks during operation.
2. Secondary reverse osmosis system (deep salt reduction core)
First level reverse osmosis (RO1):
Membrane element: Anti pollution and explosion-proof polyamide composite membrane (such as Dow BW30-400FR), with a desalination rate of ≥ 99%, can reduce the TDS of raw water from 5000mg/L to ≤ 100mg/L under a pressure of 1.2-1.5MPa.
Explosion proof configuration: The high-pressure pump is of explosion-proof type (motor Ex d Ⅱ CT4), and the pipeline is made of seamless stainless steel (316L). The connecting flange is equipped with anti-static jumper to avoid static electricity accumulation.
Secondary Reverse Osmosis (RO2):
The inlet water is RO1 produced water (low salinity), and the operating pressure is reduced to 0.8-1.0MPa. The membrane element is selected with a high desalination rate model (such as Dow BW30-440i), with a desalination rate of ≥ 99.8%. The final produced water TDS is ≤ 10mg/L, and the conductivity is ≤ 20 μ S/cm.
Concentrated water reuse: RO2 concentrated water flows back to RO1 inlet, increasing the total recovery rate of the system to 80% -85% and reducing wastewater discharge.
3. Explosion proof control and water storage system
Explosion proof control cabinet:
Core: PLC explosion-proof controller (Ex d Ⅱ CT4), integrating explosion-proof sensors such as pressure, flow, conductivity, etc., to achieve fully automatic operation (one click start stop, automatic flushing, fault alarm).
Safety features: automatic overpressure relief, leakage protection, gas leakage linked shutdown (explosion-proof gas detector can be optionally selected).
Explosion proof pure water tank:
Material: 316L stainless steel, with a capacity of 1-2 times the system’s water production, equipped with an explosion-proof level gauge (non-contact radar level gauge) to avoid sparks caused by mechanical contact.
3、 Salt reduction effect and explosion-proof performance indicators
Project raw water (typical chemical wastewater) first level RO water production second level RO water production explosion-proof requirements (compliant with standards)
TDS（mg/L） 5000-10000 ≤100 ≤10 Ex dⅡCT4（GB 50058-2014）
Conductivity (μ S/cm) 8000-15000 ≤ 200 ≤ 20 Protection level IP65
Hardness (CaCO ∝, mg/L) 500-1000 ≤ 10 ≤ 1 Anti static grounding resistance ≤ 4 Ω
Residual chlorine (mg/L) ≤ 1.0 ≤ 0.02 ≤ 0.01 Explosion proof component temperature group T4 (≤ 135 ℃)
4、 Technological advantages and core innovation
Deep Salt Reduction and Water Quality Stability
The two-stage RO series design has a retention rate of over 99.9% for monovalent ions (such as Na ⁺, Cl ⁻) and over 99.95% for divalent ions (such as Ca ² ⁺, SO ₄ ² ⁻), meeting the strict requirements of industries such as chemical and pharmaceutical industries for high-purity water (such as TDS ≤ 10mg/L for injection water).
Comprehensive explosion-proof safety design
From equipment material (316L stainless steel), electrical components (explosion-proof motors, sensors) to system grounding (anti-static jumper), the entire process complies with the “Design Code for Electrical Installations in Explosive Hazardous Environments” and can be used in Zone 1 and Zone 2 explosive gas environments.
Anti pollution and long-lasting operation
Pre treatment with three-stage filtration and RO membrane anti fouling coating extends the membrane cleaning cycle to 12-18 months;
The explosion-proof high-pressure pump adopts frequency conversion control, with energy consumption as low as 2.5-3.5 kWh/m ³, saving 20% energy compared to traditional systems.
5、 Typical application scenarios
Chemical Explosion proof Zone: Treat high salt process wastewater (such as chlor alkali workshop and pesticide production wastewater), reuse the produced water for reactor cooling and equipment cleaning, and avoid salt accumulation affecting production.
Oil and gas field operation area: Processing oilfield produced water (TDS 10000-50000mg/L), reducing salt and using it for drilling fluid configuration and oilfield water injection, reducing the cost of fresh water transportation.
Pharmaceutical explosion-proof workshop: produces purified water that meets GMP standards (conductivity ≤ 1.3 μ S)/ cm@25 ℃), used for the production of sterile preparations such as antibiotics and vaccines, to avoid salt and drug reactions.
In the field of military explosion prevention: providing pure water for ammunition workshops and pyrotechnic warehouses to prevent salt corrosion of equipment or electrochemical reactions.
6、 Maintenance and safety regulations
Component maintenance content cycle Explosion proof safety precautions
Before replacing the filter material of the pre-treatment filter, the filter element should be powered off and ventilated every 6-12 months, and explosion-proof tools should be used
Chemical cleaning and membrane element replacement cleaning of RO membrane system for 12 months, membrane for 3-5 years. Cleaning agents are stored in explosion-proof cabinets to avoid contact with fire sources
Explosion proof electrical components testing: Sealing of explosion-proof surfaces and grounding resistance. It is strictly prohibited to dismantle explosion-proof enclosures without authorization every quarter. Maintenance must be carried out by certified personnel
7、 Selection suggestions
Small system (1-10m ³/h): suitable for laboratories and small explosion-proof workshops, covering an area of 10-20 square meters, with explosion-proof rating Ex d Ⅱ CT4;
Medium sized system (10-50m ³/h): suitable for oil and gas fields and chemical industrial parks, equipped with 20-100m ³ explosion-proof water tanks, with a power of 15-50kW;
Customized configuration:
High sulfur water source: pre-treatment with sulfur removal filter (H ₂ S removal rate>99%);
High temperature raw water (>40 ℃): Choose a high-temperature resistant RO membrane (temperature resistance ≤ 50 ℃) to avoid membrane performance degradation.
summarize
This equipment is equipped with a “two-stage reverse osmosis deep desalination+full chain explosion-proof design”, which ensures safe operation in flammable and explosive environments while meeting the requirements of high salt water purification (TDS ≤ 10mg/L). It is an indispensable special water treatment solution in the fields of chemical, oil and gas, pharmaceutical, etc., balancing purification efficiency and safety reliability.
