Project Overview

Recently, at the project site of a chemical plant, it was observed that surface water and pond water contained high levels of suspended solids, making them unsuitable for production and as feedwater for ultrafiltration (UF) and reverse osmosis (RO) systems. To address this, multi-media filters were installed to reduce turbidity, enabling the water to meet production and UF/RO feedwater standards as a replacement for tap water.

Technical Requirements

• Total Treatment Capacity: 300 m³/h

• Filter Media: Quartz sand/Activated carbon

• Inlet Water Turbidity: 30 NTU/10 NTU

• Outlet Water Turbidity: 3 NTU/1 NTU

• Inlet Chloride Content: 500 mg/L

• Outlet Chloride Content: 112 mg/L

• Inlet Pressure: ≥0.3 MPa

• Backwash Water Consumption Rate: ≤3%

• Backwash Intensity: 4-15 L/s·m²

• Backwash Expansion Rate: 40-50%

• Backwash Duration: 5-7 minutes

Design Solution

• Product Selection: Multi-Media Filters

• Equipment Configuration: 4 units in parallel, single-unit sequential backwashing

• Control Method: PLC Automatic

• Inlet Main Pipe: DN250

• Outlet Main Pipe: DN250

• Wastewater Discharge Pipe: DN250

• Backwash Air Inlet Pipe: DN50

• Backwash Method: Air wash + external water backwash (triggered by differential pressure and timer)

• Anti-Corrosion Type: Carbon steel with 3mm rubber lining, epoxy resin-coated pipelines

Control Methods

1. Automatic Control:
Automatic control can be set via timing or pressure differential.

• Set the filtration time on the timer; when the time is up, backwashing will commence, and the duration is controlled by the backwash timer.

• The system continuously monitors differential pressure. If the system pressure reaches the preset value, backwashing starts automatically.

• Once backwashing is complete, the system resets to its initial state, preparing for the next cycle.

2. Manual Control:
Switch the manual/automatic toggle on the control panel to "Manual" to initiate backwashing manually.

(Illustration: Diagram of the automatic and manual control system)

On-Site Installation

The multi-media filter system was successfully installed and commissioned. The team implemented seamless coordination across business, technical, production, and safety units, ensuring smooth installation, commissioning, and electrical synchronization. From project initiation to completion, the project was executed efficiently, and the equipment is now fully operational.

Water Quality Comparison

The engineering results showed a significant reduction in impurities and harmful substances in the raw water. This improvement in water quality met the expected purification targets and provided reliable feedwater for subsequent production processes.

Impact and Outcome

The successful implementation of this project underscores the importance of multi-media filters in improving water quality. The equipment not only meets the client’s specific requirements but also contributes to the high-quality development of the enterprise, laying a solid foundation for future growth.

LEFILTER: Committed to Delivering High-Quality Water Treatment Solutions.