Industry solution
Commercial Bakery Wastewater Treatment
Wastewater Treatment for Large commercial bakeries whose products include cakes, pies, cookies, biscuits, brownies, rolls, and a variety of other breads and desserts, generate wastewater with loads of contaminants too high for municipal discharge without pretreatment. This is because many POTWs now use biological treatment that would be overwhelmed by these loads.
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Bakery wastewater challenges
Bakeries use large volumes of butter, flour, shortening, sugar, and fillings. These ingredients can produce high levels of contaminants, including BOD, suspended solids, and fats, oils, and grease, which generally require pretreatment before discharge.
Typical content levels before treatment
| COD | BOD | TSS | TP | TKN | FOG |
|---|---|---|---|---|---|
| 7,000 | 3,200 | 6,000 | 6.8 | 36 | 820 |
Influent characteristics
Typical measured contaminant levels as wastewater leaves the factory include:
- COD: 7,000 mg/L
- BOD: 3,200 mg/L
- TSS: 6,000 mg/L
- TP: 50 mg/L
- TKN: 100 mg/L
- FOG: 820 mg/L
Required effluent characteristics
Typical treated-wastewater limits before discharge to publicly owned treatment works (POTWs) include:
- COD: 1,000 mg/L
- BOD: 250-500 mg/L
- TSS: 250 mg/L
- TP: 20 mg/L
- TKN: 50 mg/L
- FOG: 100 mg/L
Optimum treatment solutions
Pretreatment is necessary before bakery wastewater is discharged to a municipal sewer because municipal treatment plants may be unable to remove contaminant densities typical of commercial bakery wastewater. A dissolved air flotation (DAF) system is an efficient, cost-effective option for removing solids, fats, oils, and grease.
Pretreatment using an enhanced DAF system in a commercial bakery can reduce FOG by up to 99% and TSS by up to 97%. Flocculant addition and pH adjustment for FOG removal can be automated using the Ecologix Enhanced Dissolved Air Flotation System.
DAF process description
- A DAF system injects microscopic air bubbles into the DAF tank.
- The bubbles attach to insoluble pollutant materials and float them to the surface.
- Heavier materials may require flocculants, which attract suspended particles and air to form clusters that float to the pretreatment vessel surface.
- The accumulated surface contaminants, or sludge, are scraped from the water and removed from the treatment process.
- Clean water exits at the bottom of the DAF vessel and can be discharged to the sewer.
Preview results from an Enhanced Dissolved Air Flotation System (E-DAF) processing wastewater from a U.S.-based commercial bakery.
If your commercial bakery is struggling to meet wastewater discharge requirements, call 1-678-514-2100 or contact us to discuss an onsite package pretreatment plant.
