• 2025-07-22

Surface water treatment

Core treatment process

Coagulation stage

Add PAC (polyaluminium chloride) or PFS (polyferric sulfate) coagulant

Fast mixing (G value > 300s⁻¹) to destabilize the colloid

Flocculation control

Gradient speed reduction stirring (40-20s⁻¹) to form ≥2mm alum flowers

Reaction time 15-25 minutes (water temperature 10-25℃ range)

Sedimentation optimization

Slope tube sedimentation tank surface load 0.6-1.0m³/(㎡·h)

Water turbidity control ≤3NTU

Multi-stage filtration

Dual media filter bed (anthracite + quartz sand, total depth 1.2m)

Activated carbon layer adsorbs organic pollutants (iodine value ≥950mg/g)

Terminal disinfection

Chlorine contact time ≥30 minutes (CT value > 15mg·min/L)

Residual chlorine at the end of the pipe network 0.05-0.3mg/L

Surface water characteristics challenge

Pollution load

✔ Seasonal fluctuations in algae density (10⁴-10⁶cells/mL)

✔ Micro-polluting organic matter (CODMn 5-15mg/L)

✔ Risk of residual Giardia cysts

Processing bottlenecks

✔ Traditional process for the removal rate of two parasites (Cryptosporidium/Giardia) <1log

✔ Chlorine disinfection generates THMs byproducts

FupengWater innovative solutions

Ultrafiltration system (UF)

Adopting PVDF external pressure hollow fiber membrane (0.03μm pore size)

Continuous guarantee:

✔ Turbidity <0.1NTU

✔ Two parasites removal rate >4log

✔ Bacteria retention rate 100%

Ultraviolet disinfection system

Equipped with 40mJ/cm² ultraviolet dose generator

Pre-requisites:

✔ UF/sand filtration pretreatment (SDI15 <3)

✔ UVT＞85%

Real-time monitoring of UV intensity and transmittance

Project value

Water quality assurance

106 indicators meet the new national standard GB5749-2022

Odor threshold (TON) stable ≤ level 3

Operation optimization

Ultrafiltration backwash cycle extended to 60 minutes

Disinfectant dosage reduced by 40%

Sustainability

Membrane system recovery rate＞95%

No generation of halogen-free disinfection by-products