Rainwater treatment

Rainwater treatment uses a graded interception process to purify surface runoff. The core filtration unit includes:

Heavy metal targeted adsorption: special ion exchange resin accurately captures metal ions such as lead and zinc (removal rate > 98%)

Multi-layer media filtration: quartz sand + activated carbon composite filter bed intercepts > 50μm suspended solids (turbidity ≤ 1NTU)

Membrane deep treatment: 0.1μm ultrafiltration membrane blocks microorganisms and colloids (SDI value is stable < 4)

Key indicators of system operation and maintenance

Filter media maintenance

Backwashing is required when the pressure difference of the multi-media filter layer is > 0.15MPa

Activated carbon adsorption saturation Cycle ≤ 6 months

Ecological facility control

Detention pond sludge accumulation depth < 30cm

Artificial wetland plant coverage ≥ 85%

Project implementation focus

Pretreatment enhancement: pre-treatment of cyclone sand removal device (SS removal rate > 80%)

Intelligent monitoring: online turbidity meter + heavy metal sensor real-time warning

Emergency guarantee: parallel filter tank design ensures continuous operation during the rainy season

Environmental benefit verification

Pollution control

Reduction of runoff petroleum substances ≥ 90%

TSS load reduced to below 20mg/L

Ecological protection

Heavy metal compliance rate of receiving water bodies 100% (GB 3838-2002 Class III standard)

Catchment ecological restoration cycle shortened by 40%

Resource benefits

Rainwater reuse rate reaches 70% (greening/cooling water replacement)

Municipal sewage treatment load reduced by 35%

All about water...