Case: Domestic sewage treatment plant in a certain city
I. Project background
Processing scale: 50,000 m³/day (serving 400,000 people)
II. Original process pain points:
Effluent does not meet the local "quasi-Class IV" new regulations;
Sludge moisture content is 80%, and the landfill cost is high;
Energy consumption reaches 0.45 kWh/m³, and carbon emission pressure is high.
III Transformation goals:
Effluent is stable at "quasi-Class IV"
Sludge reduction is 50% + energy self-sufficiency rate>30%;
Recycled water reuse rate ≥20%
IV. Detailed explanation of core unit process
Coagulation sedimentation tank (chemical enhanced pretreatment)
Function: remove SS, colloidal organic matter and part of phosphorus, reduce biochemical load
Application of reagents:
Reagent | Dosage point | Dosage | Mechanism of action |
PAC | Inlet pipe | 30-50 mg/L | Neutralize charge and form Al(OH)₃ flocs
|
PAM | Flocculation reaction zone | 0.5-1 mg/L | Bridging effect increases floc volume |
2. Sludge dewatering section (PAC+PAM synergistic conditioning)
Reagent operation specifications:
Link | PAC dosage | PAM type/dosage | Target of action |
Sludge conditioning | 3-5kg/ton dry mud | Cationic PAM 0.8-1.2kg/ton | dry mud Destroy colloid structure and enhance dewatering |
VI ：PAM Slection
On-site verification
