Shallow Sand Filter Side Filtration Project Case for Circulating Water in Chemical Enterprises
Project Background
Owner: A chemical enterprise in Shandong Province
Application: Side-stream purification of circulating cooling water to solve cooling tower packing blockage, heat exchange efficiency reduction and bacterial & algae breeding problems
Design Capacity: Treatment flow rate of 100 m³/h
System Configuration: Complete 4-unit shallow sand filter system, PLC automatic control cabinet, internal backwashing pipeline
Process Route: Circulating return water → Shallow sand filtration system → Clean circulating water flows back to cooling tower
Pain Points (Before Renovation)
The long-term turbidity of circulating water stays at 12～20 NTU with high suspended solids concentration;
Heat exchangers need to be shut down for cleaning every six months;
Large dosage of water treatment chemicals and high water consumption.
Solution Highlights
- Nternal backwashing: No external backwashing water supply needed. Each tank can be backwashed independently, and the rest tanks maintain continuous filtration to ensure uninterrupted production.
- Dual control logic: Backwashing triggered by pressure difference and timing; local manual operation and remote monitoring are both available.
- High filtration speed and small floor area. It is applicable to bypass reconstruction of original pipelines in the plant without large-scale civil construction.