Double-Pass High Purity Reverse Osmosis Water Treatment System 10TPD Pharmaceutical Semiconductor Grade

The FRO-DP Series Double-Pass Reverse Osmosis System is purpose-built for applications demanding the highest possible permeate purity from membrane-based treatment alone. By cascading two independent RO stages with intermediate pH adjustment and UV sterilization, the system achieves combined salt rejection exceeding 99.9%, producing water with conductivity consistently below 1.0 μS/cm (TDS < 0.5 ppm) from typical municipal or well water sources. The 10TPD capacity configuration is ideal for pharmaceutical purified water (USP/EP compliant), semiconductor wafer fabrication rinse water, laboratory-grade reagent water (ASTM Type E-1), and medical device manufacturing where water quality directly impacts product safety and regulatory compliance. Every wetted surface from the intermediate storage tank through final distribution uses sanitary-grade SS316L with tri-clamp connections, ensuring full drainability and cleanability in accordance with GMP guidelines.

True Double-Pass Configuration: The first pass removes over 99% of dissolved solids using six BW30-4040 brackish water membranes, with the permeate flowing to a sealed SS316L intermediate storage tank equipped with UV sterilization at 254 nm to control microbial growth before entering the second pass. The second pass processes this already high-quality water through four additional BW30-4040 membranes, achieving the final ultrapure specification with TDS below 0.5 ppm.

Automatic pH Optimization: A precision NaOH dosing system with pH probe feedback injects pharmaceutical-grade sodium hydroxide into the first-pass permeate before the second pass, converting dissolved carbon dioxide (CO₂) to bicarbonate ions (HCO₃^-) for effective removal by the second-pass membranes. This critical step ensures consistent permeate conductivity below 1.0 μS/cm regardless of feed water alkalinity variations.

Full Sanitary SS316L Construction: All wetted components from the intermediate tank to the final permeate outlet are fabricated from pharmaceutical-grade SS316L stainless steel with electropolished internal surfaces (Ra ≤ 0.8 μm), sanitary tri-clamp connections, and zero dead-leg design meeting ASME BPE guidelines for hygienic processing systems.

Triple-Point Conductivity Monitoring: Online conductivity analyzers with temperature compensation are installed at three critical control points: first-pass permeate, intermediate tank outlet, and final permeate, providing complete transparency on each stage's performance and enabling early detection of membrane degradation or seal leakage before water quality is compromised.

GMP-Ready Documentation Package: The system ships with a comprehensive qualification documentation set including Design Qualification (DQ), Installation Qualification (IQ) protocol templates, Operational Qualification (OQ) test scripts, and material certification for all wetted components with traceability to melt certificates, substantially reducing validation timeline for pharmaceutical and medical device manufacturers.

Grundfos SS316L Pumps for Both Passes: Each RO stage is powered by a dedicated Grundfos CRN vertical multi-stage centrifugal pump with super duplex stainless steel construction, mechanical shaft seal with FDA-compliant EPDM elastomers, and VFD-ready motor for precise pressure control and energy optimization across varying operating conditions.

Hot Water Sanitizable Option: The system can be specified with hot-water-sanitizable membrane elements and components rated for periodic sanitization at 85°C, providing an additional microbial control strategy that eliminates the need for chemical sanitizers in pharmaceutical water systems and extends intervals between chemical CIP cycles.

The FRO-DP Series is specifically engineered for industries where water quality is a critical process parameter and regulatory compliance is mandatory. Primary applications include pharmaceutical purified water (PW) generation in compliance with USP <1231> and European Pharmacopoeia monographs, serving as pretreatment for Water for Injection (WFI) distillation systems, semiconductor wafer fabrication rinse water meeting ASTM D5127 Type E-1.2 specifications, medical device cleaning and passivation processes, biotechnology fermentation and cell culture media preparation, clinical laboratory analyzer feed water, cosmetic and personal care product manufacturing, and high-pressure boiler feed water for power generation where silica and TDS must be minimized to prevent turbine blade deposition. For applications requiring sub-ppb TOC levels, the double-pass permeate can serve as ideal pretreatment for downstream electrodeionization (EDI) or ultrapure water polishing systems, extending EDI stack life and reducing regeneration chemical consumption. The skid-mounted design with casters allows relocation within facilities as production layouts evolve.

Each FRO-DP system is subjected to an intensive factory acceptance test including 48-hour continuous operation with instrumented water quality monitoring, membrane integrity pressure hold testing, sanitary system hydrostatic testing at 1.5* design pressure, and full PLC sequence validation. Following testing, the system is completely drained, nitrogen-purged to prevent microbial growth during transit, and all openings are capped with sanitary closures. The complete assembly is packed in an ISPM-15 compliant fumigated export crate with shock indicators, tilt indicators, and humidity monitoring cards. Documentation deliverables include material certificates for all wetted components, surface finish certificates, weld inspection reports, pressure test certificates, and a pre-populated validation binder. Optional on-site IQ/OQ execution by qualified engineers is available to support regulatory inspections. The 1-year standard warranty includes priority technical support with remote diagnostic capability for installations worldwide.