Anaerobic Digester Pilot Study
On average, a brewery will produce 3 barrels of wastewater for each barrel brewed. Brewery wastewater includes high biochemical oxygen demand (BOD), high chemical oxygen demand (COD) and high total suspended solids (TSS), which cannot be disposed to the public sewer system when produced in high quantity.
A common way to treat brewery wastewater is to use anaerobic digestion, a natural breakdown of organic materials into biogas, clean water, and natural fertilizer. Anaerobic digesters are typically paired with a dewatering technology that enables the anaerobic digester to operate at a constant concentration.
Our client was seeking a more cost-effective ultrafiltration solution that delivered the required permeate water quality for discharge. By delivering a stable flux performance at increased solids concentrations (3% TSS), the CAPEX and OPEX of the system will be considerably reduced.
Our CERA~DUR technology was evaluated to deliver an enhanced performance and offer a lower total cost solution. The CERA~DUR modules are designed to operate in crossflow in-out mode with ultrafiltration ceramic hollow fiber membranes having a pore size (D90) of 80 nm.
The operating conditions were as follows:
- Average flux: 130 LMH
- Transmembrane pressure (TMP): 1 bar
- Backwash frequency and duration: 20 seconds every 30 minutes
- Backwash pressure: 2 bar
Pilot Performance Results
Successfully dewatered the waste stream to 5% concentration of biomass, overachieving our objective of 3%
Delivered high quality permeate water to be disposed, containing < 1 ppm TSS
Achieved a stable flux of 130 LMH at constant concentration of 3% TSS