BFQ Series Pump: A Reliable Solution for Chemical Sludge Dewatering

Aug,28,2026

A fine chemical wastewater treatment station processes several thousand tons of combined wastewater per day. The thickened sludge has a solids content of 25% and contains corrosive salts, sand/grit, and flocculated agglomerates, and needs to be fed to a plate-and-frame filter press for dewatering. The original conventional pumps were prone to abrasion from sand particles, offered poor corrosion resistance in the pump housing, and required frequent parts replacement. Additionally, the flow rate was non-adjustable, making it difficult to match the two-stage process of "chamber filling first, then pressing" — resulting in material overflow and poor dewatering performance.

Solution

The site replaced the original pumps with the BFQ Series stainless steel large-flow pneumatic diaphragm pumps, specifically addressing the conveying challenges:

  1. Corrosion Resistance, Anti-Clogging, and Wear Resistance: The 304 stainless steel pump body withstands salt-induced corrosion. The large-flow-path design allows passage of large solid particles, and the wear-resistant diaphragms resist clogging and sand erosion.

  2. Adjustable Flow and Pressure: Supply air pressure is controlled via a pressure regulator valve. In the early feed stage, low air pressure is applied to enable high reciprocation speed and high flow rate for rapid chamber filling. Once the filter chambers are filled, the air pressure is increased to boost output pressure for high-pressure squeezing — perfectly matching the varying requirements of each filter-press phase.

  3. Safe and Reliable Operation: Fully pneumatically driven and explosion-proof, suitable for chemical plant hazardous areas. The pump can run dry, withstand dead-heading, and is not easily damaged by liquid level fluctuations or feed-side pressure surges.

  4. Easy Maintenance: The stainless steel housing is easy to clean, and the pump assembly/disassembly is simple — allowing single-person maintenance.

Application Benefits

  1. Improved Quality & Efficiency, Process Compatibility: Resolved issues of corrosion-induced material sticking and feed-rate imbalance. Filter-press cycle times were shortened, sludge treatment capacity increased, and cake dewatering performance improved.

  2. Cost Reduction & Risk Mitigation: Replacement intervals for wear parts were significantly extended, maintenance frequency sharply reduced, and both spare parts and labor costs lowered. The risk of environmental leakage incidents was greatly minimized, ensuring stable production line operation.

The BFQ Series stainless steel large-flow pneumatic diaphragm pump effectively addresses the pain points of corrosive salt-laden sludge conveying — including corrosion, difficult flow control, and frequent maintenance. Leveraging its corrosion-resistant large-bore construction, air-pressure flow/pressure control, pneumatic explosion-proof design, and easy maintenance, it is ideally suited for sludge filter-press feed applications. This solution helps enterprises improve quality, reduce costs, and serves as a preferred upgrade option for replacing aging conveying equipment.

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