Application of water treatment technology
POLYCO GROUP’S introduction
Sewage treatment system for breweries
With a consumption of 3.8 billion liters in 2015, Vietnam is one of the largest beer markets in Asia. According to brewing industry, in 2015,
Sewage from breweries
Beer contains mostly water (> 90%), ethanol (3 - 6%), CO2 and other solvents. The brewing industry is one of the largest users of water, the average water use of Sabeco and Habeco is about 4.6 to 6.0 liters per liter of beer. Brewing is therefore one of the industries that requires a lot of water, so it emits a very large amount of sewage. Sewage from breweries usually includes the following types:
1. Cooling water, condensate. This type of water is not polluted so it can be pre-treated and re-used;
2. Water using for sanitary equipment such as washing pot cooking, tank, floor of manufacturer. This sewage contains a lot of organic matter which needs to be treated to clean the environment and re-use;
3. Sanitary water and fermentation equipment, pipeline containers, fermented floors. This type of sewage contains many yeast carcasses, the yeast is easy to decay causing serious pollution. This type of sewage requires special treatment to reduce the risk of contamination;
Picture 1. Diagram of
Sewage from breweries is highly organic pollution which decomposes very quickly so sewage is black and it causes serious pollution plus additives and chemical process of production such as CaSO4, H3PO4 , NaOH, Na2CO3 etc If not being treated, these substances will cause seriously environmental pollution when the sewage is discharged directly to the receiving source without being treated well.
Based on the above analysis, sewage treatment in beer production to reuse is the most effective solution. Sewage from brewery’s operations has high nutrient content and traditional treatment methods by introducing sewage into urban or industrial sewage treatment plants, both wasteful and pressurized to the downstream source. In addition, sewage treatment of urban sewage treatment plants or industrial zones greatly increases the cost of breweries.
Because of the potential value of sewage from brewery rich in carbon and nutrients (N / P), the choice of optimal technology can save costs, can use renewable energy and reuse to reduce cost is an urgent need.
sewage from brewery
2-8 hL sewage/hL beer
0.5-3 kg COD/hL beer
0.2 – 2kg BOD/hL beer
0.1-0.5 kg TSS/hL beer
There are many technologies to treat sewage from breweries. However, with the current conditions, current breweries such as Sabeco and Habeco choose anaerobic and aerobic treatment technologies. The use of this technology results in lower operating costs and stable discharge quality and high system safety.
With a high organic content, the BOD5 / COD> 0.5 ratio should be treated with anaerobic and aerobic combined bioreactors. Sewage treatment technologies commonly used are: UASB (Upflow Anaerobic Sludge Blanket), combined with SBR (Sequencing Batch Reactors).
Table 2. Comparison between anaerobic and aerobic systems
High: CH4 is produced as biogas
Low: CO2 only
Low energy consumption
Remove (N / P)
UASB anaerobic treatment process (Upflow Anaerobic Sludge Blanket):
In UASB tank, sewage is evenly distributed on bottom of the tank and goes from the bottom to the suspended sediment, then through mud layer (microorganism), anaerobic in tank will mix absorbs organic matters. (BOD, COD etc) dissolve in sewage, and break down and convert them into biogas (about 70-80% of methane and 20-30% of carbon dioxide and other gases). Output biogas is collected for
Picture 2. UASB system and collecting biogas to supply steamer
Advantages of UASB technology:
COD removal efficiency up to 90%
Sewage treatment with very high levels of organic pollution
Very low energy consumption during operation.
Sequencing Batch Reactors (SBR):
As a reactor works in the form of activated sludge treatment, two periods of
Anoxic Fill Phase: Sewage at this stage is distributed throughout the tank with activated sludge at the bottom of the tank. Bioprocesses occurring simultaneously in this stage are anaerobic and aerobic. Sewage flowing into the tank to the level indicator, the sensor signal level signaling the valve closed again.
Reaction: After finishing Anoxic Fill Phase, sewage is continuously aerated with stirring. In this stage, sewage is treated until sewage is treated to the permitted level. This process creates a biochemical reaction between activated sludge and activated sludge. The length of ventilation and aeration are dependent on the quality of sewage and the level of treatment required.
Sedimentation process: Aeration process and stirring stop, activated sludge is settled to the bottom of the tank. Sedimentation occurs in a static environment, the hydraulic effect of the tank reaches 100%.
Water splash in: Inner water is collected in the disinfection tank through decanter.
Activated sludge collection / retention: The tank is ready for loading. Activated sludge is pumped into the slurry tank.
Cycle work cycles are installed through intelligent and flexible control software.