- 2025-07-22
TSS Water Treatment
TSS pollution characteristics and control requirements
TSS concentration in industrial wastewater is usually 200-2000mg/L (up to 5000mg/L in food/printing and dyeing industries)
Discharge limit: primary standard ≤70mg/L, centralized sewage treatment plant ≤20mg/L
UV disinfection interference threshold: when TSS＞15mg/L, the transmittance decreases by 40%
Three-stage cascade treatment process
1. Primary physical and chemical treatment
High-efficiency coagulation and sedimentation system (PAC/PAM composite addition, G value gradient control)
Surface load of inclined tube sedimentation tank 0.8-1.0m³/(㎡·h)
TSS removal rate＞85% (when the influent is 500mg/L)
2. Core filtration technology
Ultrafiltration membrane separation system
Polyvinylidene fluoride hollow fiber membrane (MWCO 50kDa)
Transmembrane pressure difference ≤ 0.15MPa, flux 50-80LMH
Water sand content of effluent < 1NTU
Deep media filtration
Multi-layer graded filter media (anthracite + quartz sand + garnet)
Filtration rate 8-12m/h, backwash intensity 13L/(㎡·s)
3. Precision solid-liquid separation
Automatic plate and frame filter press (feed pressure 0.8MPa)
Sludge moisture content reduced to below 60%
Centrifugal dehydrator solid recovery rate > 95%
Key process control points
Coagulant optimization:
Aluminum coagulant effective pH 6.0-7.2
Iron coagulant effective pH 4.5-5.5
Membrane pollution prevention and control:
Air-water combined backwash (0.25MPa, 45min interval)
Chemical enhanced backwash (0.1% sodium hypochlorite + 0.5% citric acid)
Specific industry solutions
Food wastewater: cyclone flotation + drum filtration (TSS reduced from 3000mg/L to 50mg/L)
Printing and dyeing wastewater: catalytic ozone oxidation + fiber bundle filtration (90% simultaneous removal of chromaticity)
Electronic wastewater: tubular microfiltration + ion exchange resin (meeting pure water preparation requirements)
Engineering implementation verification indicators
Filtered water SDI value <3 (core indicator of reverse osmosis inlet water)
Ultraviolet disinfection effective dose ≥30mJ/cm² (TSS≤10mg/L guaranteed value)
Sludge settling ratio (SV30) <20% (biochemical system pre-control indicator)
