Solving DAT-Schaub's Problem Of 'High Fat Content Wastewater'
DAT-Schaub, in collaboration with Alumichem, has developed a solution that ensures more stable plant operation, halves chemical consumption, and improves wastewater treatment in the meat industry.
Introduction
Dat-Schaub is one of the world’s largest producers of natural casings for luxury sausages. Dat-Schaub in Aabybro receives trimmings and waste from other Dat-Schaub facilities in Denmark. This waste is processed into biodiesel and animal feed. The sludge from the wastewater is converted into biogas.
The Challenge
The wastewater entering the treatment plant is high in fat content and has varying characteristics. It is received at a temperature of 80°C. The high temperature, combined with the high fat content, caused fat deposits and unstable operation of the water treatment system when the fat cooled down.
Alumichem’s Solution
Alumichem’s consultant inspected the plant, conducted on-site laboratory tests, and then performed full-scale tests by switching from ferric chloride (FeCl3) to AluBLEND.
| Coagulant | Before (Ferric Chloride) | After (AluBLEND 600) |
| Total-N | 319-697 mg/L | 166 mg/L |
| Total-P | 15-45 mg/L | 7,4 mg/L |
| Fat + oil | 43 mg/L | 12 mg/L |
| COD | 2990-5700 mg/L | 1720 mg/L |
Results
After switching the coagulant, Dat-Schaub now meets strict environmental requirements more effectively. The wastewater, which contained high levels of COD, fat + oil, phosphorus, and nitrogen (see table), is now treated to comply with regulatory limits. At the same time, there is a significant reduction in chemical consumption: >50% reduction in coagulant consumption. 10-20% reduction in polymer usage.
“A smooth process with professional handling of trials – and great results.” Lars Larsen, Operational Manager Dat-Schaub, Aabybro, Denmark
Source: Alumichem