Effective Wastewater Treatment for Alcohol & Ethanol Production

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Experience in Treating Wastewater from Alcohol and Ethanol Production: What Businesses Should Know

1. Characteristics of Alcohol & Ethanol Wastewater

BOD5: 2,000 – 10,000 mg/L
COD: 3,000 – 12,000 mg/L
SS: 300 – 1,000 mg/L
Contains fermentation residues, leftover alcohol, unconverted starch, etc.
pH typically ranges from 3.5 to 5.5 (mildly acidic)

Note: If discharged untreated, alcohol wastewater can rapidly deplete dissolved oxygen in receiving bodies (rivers, ponds, canals), generate foul odors, and harm aquatic life.

2. Choosing the Right Treatment Process: Practical Insights

Selecting a suitable treatment system requires matching the organic load, flow rate, and discharge requirements. Below is an effective multi-stage treatment process commonly used:

Step 1: Preliminary Treatment – Screening & Flotation

Remove suspended solids and fermentation residues using bar screens, primary sedimentation, or Dissolved Air Flotation (DAF).
If grease and oil are present, include a grease trap or oil separator.

Step 2: Anaerobic Biological Treatment

Due to high COD, anaerobic treatment is essential.
The UASB (Upflow Anaerobic Sludge Blanket) tank removes 60–85% of COD efficiently.
Biogas generated during this process can be reused as an energy source.

Step 3: Aerobic Biological Treatment

After anaerobic treatment, wastewater enters Aerotank or MBR (Membrane Bioreactor) systems to further reduce BOD, COD, and ammonia.
Fine bubble diffusers and blowers help enhance oxygen transfer and biological activity.

Step 4: Filtration and Disinfection

Use sedimentation tanks, pressure filters, and chlorine/UV disinfection to ensure treated water meets Vietnam's QCVN 40:2011/BTNMT Column A or B discharge standards.

3. Important Operational Tips

✔ Maintain stable flow and organic load to avoid shocking the biological system
✔ Adjust pH to 6.5–7.5 before biological treatment
✔ Monitor sludge concentration and microbial activity
✔ Avoid discharging harsh chemicals or detergents into the system to protect microorganisms

4. Cost & Efficiency Considerations

Investment cost depends on the flow and chosen technologies (typically ranges from 300 to 1,500 million VND for 50–200 m³/day)
Low operating cost if biogas is reused
Treatment efficiency: Up to 90%+ BOD and COD removal, ensuring safe discharge

5. Tâm Lực – Trusted Supplier of Wastewater Treatment Systems for Alcohol & Ethanol Industries

With years of experience, Tâm Lực has successfully implemented treatment systems for:

Alcohol plants
Rice wine distilleries
Food & beverage factories

We offer:

Optimized design – cost-effective operation
Full technical documentation and environmental reports
Automatic operation – user-friendly systems
On-site support – long-term warranty

Need Expert Consultation? Contact Us Today!

Website: www.tamluc.com
Email: info@tamluc.com
Hotline: +84 909 xxx xxx

Effective Wastewater Treatment for Alcohol & Ethanol Production | Tâm Lực

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