200 QJB Submersible Mixers Delivered for a Russian Municipal Wastewater Treatment Project

Quzhou Zhongyi Chemicals Co., Ltd. (brand ZY) has successfully completed the production, testing and shipment of 200 units of QJB submersible mixers for a large municipal wastewater treatment project in Russia. The order was placed by a Russian environmental engineering contractor after a technical evaluation period, and the equipment is now being installed across several aeration and sludge tanks in the client's upgraded treatment plant.

Project Background

The client operates wastewater treatment facilities serving a residential and industrial district with strong seasonal temperature swings. Their existing mixing equipment suffered from frequent seal failures and shaft vibration, which reduced tank turnover efficiency and drove up maintenance costs. The project required a reliable replacement solution capable of continuous duty in cold climates, low energy consumption, and full compatibility with the local 380V/50Hz three-phase power supply.

After comparing suppliers from Europe and Asia, the contractor selected our QJB series because of the combination of proven hydraulic design, complete technical documentation and competitive delivery time.

Why the QJB Series Was Selected

• High-efficiency mixing performance — optimized impeller geometry creates strong axial flow, preventing sludge sedimentation and keeping suspended solids evenly distributed.
• IP68 double mechanical seal — two independent mechanical seals plus a moisture sensor protect the motor even during long-term submerged operation.
• Cold-climate reliability — motors and seals were configured for low-temperature duty, with frost-resistant lubrication and reinforced cable entry.
• Low maintenance cost — the guide rail and lifting system allow the mixer to be raised for inspection without draining the tank.
• Corrosion resistance — SS304 wetted parts for aggressive municipal sewage, cast iron epoxy-coated versions for standard aeration basins.

Technical Configuration of the 200-Unit Order

All units are rated for 380V/50Hz three-phase operation, IP68 protection, Class F insulation and continuous duty (S1). Each mixer is supplied with lifting hoist, guide rail brackets, 10 m submersible cable and a full installation manual.

Quality Control and Documentation

Before packing, every mixer passed a four-stage inspection:

1. Motor winding resistance and insulation test
2. Dynamic balancing of impeller and shaft assembly
3. 24-hour continuous running test with current and temperature logging
4. Double mechanical seal pressure and leak test

The shipment was accompanied by test reports, material certificates, CE documentation, wiring diagrams and a Russian-language operation manual, so the client's installation team could commission the equipment without waiting for on-site support.

Export Packing and Delivery

The 200 mixers were packed in fumigation-free plywood cases with foam-secured motor housings, loaded into two 40HQ containers and shipped via the China–Europe rail corridor to shorten transit time to the client's inland site. Our export team handled the complete document set, including commercial invoice, packing list, certificate of origin and insurance.

About Quzhou Zhongyi Chemicals Co., Ltd.

Founded in 2007, Quzhou Zhongyi Chemicals Co., Ltd. is a manufacturer and exporter of pumps and valves serving municipal wastewater, chemical processing and industrial fluid handling markets. With more than 80% of output exported, we support OEM and ODM projects, provide full technical selection support, and deliver submersible mixers, sewage pumps and progressive cavity pumps worldwide.

For technical selection of QJB submersible mixers for your wastewater treatment project, contact our export team for a specification sheet and quotation.