Traditional pretreatment processes often face three major failure risks:
Cream fat coagulation leads to pipeline blockage, suspended matter accumulation deteriorates sludge settling properties, and pH mutation causes coagulation failure. Professional pretreatment requires three core equipment: air flotation machines break the oil-water emulsion to remove cream particles ≥20μm, sedimentation tanks capture colloidal casein and calcium phosphate precipitation, and integrated equipment integrated units cope with small and medium flow fluctuations.
Air flotation machines need to break through three key technologies in cream separation:
The pressure of the dissolved air system is maintained at 0.35-0.45 MPa (15% higher than the conventional one), the aperture of the energy releaser is ≤5 microns to control the bubble particle size to 20-50 microns, so that the cream adhesion efficiency is increased to more than 98%. The anti-clogging flow channel design needs to control the water inlet flow rate to 0.8-1.2 m/s to prevent cream deposition, the scraper adopts variable frequency control (5-15 times/hour) to adapt to the change of grease thickness, and the mud discharge slope is ≥45° to avoid mud accumulation on the inclined plate. Energy consumption control requires a dissolved air-water return ratio of 30%-40% (10% lower than traditional DAF), and power consumption per ton of water ≤2.5 kWh (models with a processing capacity of ≥50 cubic meters/hour).
The removal of colloidal pollutants in the sedimentation tank relies on the modular design of inclined tubes:
The diameter of the regular hexagonal honeycomb tube is 50 mm, and the inclination angle is 60° to optimize the mud-water separation trajectory, with a surface load of 1.25±0.15 cubic meters/(square meters·hour). The coagulation reaction zone needs to be dosed in stages: polyaluminum chloride is added to the rapid stirring zone to compress the casein double layer, and anionic PAM is added to the slow flocculation zone to form alum flowers through bridging. The sludge discharge system adopts a siphon-type sludge discharger (vacuum degree ≥0.06 MPa), and the sludge solid content is ≥3% (40% higher than gravity sludge discharge).
The process integration of the integrated equipment follows a compact logic:
The flotation unit → sedimentation zone → A/O biological zone is connected in three stages in series, and the land occupation is reduced by 45% compared with the traditional process. The core parameter control includes hydraulic retention time (25-30 minutes for flotation, 1.5-2 hours for sedimentation, 8-10 hours for biological stage) and sludge return ratio of 50%-70%. The intelligent control system adjusts the dosage in real time through PLC (based on turbidity/COD online monitoring), and the flotation dissolved air pressure is automatically compensated (temperature sensor linkage).
For the pretreatment needs of dairy wastewater, we provide
Flotation machine/sedimentation tank/integrated non-standard customization (material optional 304SS/carbon steel anti-corrosion)
Integrated equipment is delivered quickly in 30 days
Free process design, quick accesshttps://www.lamella-clarifier.com/contact.html
