Water Reuse Supplier & Manufacturer for the Bulgaria Market

The Black Sea exhibits an average total dissolved solids (TDS) concentration between 17,000 and 18,500 mg/L—substantially lower than the Mediterranean Sea (38,000–41,000 mg/L). Consequently, reverse osmosis systems operating in Bulgaria require significantly lower operating pressures (typically 35–45 bar versus 65–75 bar in the Mediterranean). This translates directly into smaller high-pressure feed pumps, lower specific energy consumption (≤ 2.5–2.8 kWh/m³), and the ability to utilize high-flux brackish-to-seawater hybrid membrane configurations, reducing Capex by up to 25%.

During late spring and summer, the western Black Sea experiences eutrophic algal blooms resulting in spikes of Silt Density Index (SDI) and extracellular polymeric substances (EPS). Tongjie's containerized plants utilize dual-stage prefiltration consisting of pressurized multimedia filters (anthracite/garnet) coupled with automatic self-cleaning ultrafiltration (UF) hollow-fiber membrane systems (pore size 0.02 μm). Continuous monitoring of SDI (< 3.0 target) and automated chemical dosing (coagulant and biocide/neutralizer) ensure downstream SWRO spiral-wound elements remain protected from biofouling.

All equipment exported to Bulgaria is designed, manufactured, and documented under CE declarations of conformity. Mechanical and pressure-retaining components (RO membrane housings, cartridge vessels, stainless manifolds) comply fully with the European Pressure Equipment Directive (PED 2014/68/EU). Control enclosures feature IP55/IP66 ingress protection, CE-marked Schneider or Siemens switchgear, and dual-language HMI interfaces (English/Bulgarian) compliant with Low Voltage (LVD) and EMC Directives. Complete material test certificates (EN 10204 3.1) are furnished with every delivery.

Standard containerized systems (100 to 1,000 m³/day) require 45 to 60 days for precision fabrication and full-load factory acceptance testing (FAT) in Shanghai. Maritime transit from Shanghai to the Port of Varna or Port of Burgas typically takes 30 to 38 days via standard Mediterranean/Black Sea shipping routes. Because skids are fully integrated and pre-commissioned within ISO standard containers, site erection and wet commissioning can be completed within 10 to 15 days following site arrival.

Yes. Tongjie DTRO systems are specifically engineered for heavy fouling and high osmotic pressure streams. The open-channel disc-tube geometry generates high shear turbulence across the membrane surface, preventing the concentration polarization layer from precipitating silica and calcium sulfate salts. DTRO can reliably operate up to 90–120 bar, concentrating brine TDS up to 100,000–120,000 mg/L before downstream thermal evaporation, thereby slashing the steam requirement of MVR crystallizers.

Our systems include industrial IoT remote telemetry modules that enable real-time cloud SCADA monitoring, remote diagnostics, and setpoint optimization directly from our Shanghai technical headquarters. For physical maintenance, Tongjie maintains long-term service agreements with regional European mechanical contractors, and we stock consumable components—including cartridge filters, chemical metering pumps, and standard membrane elements—available for rapid dispatch across the EU.