The Up flow Anaerobic Sludge Blanket (UASB) digester is a widely adopted biological wastewater treatment technology, especially in developing countries such as India. It is primarily used for the treatment of municipal and industrial wastewater, offering an efficient, cost-effective, and energy-saving solution for organic matter removal.
Industrial Applications
UASB digesters are extensively used across various industries owing to their robustness and adaptability:
- Municipal Wastewater Treatment: Commonly employed in sewage treatment plants across Indian cities and towns.
- Food and Beverage Industry: Effective in treating effluents from breweries, dairies, sugar mills, and distilleries.
- Pulp and Paper Industry: Used to treat high-strength organic wastewater generated during paper production.
- Chemical and Pharmaceutical Industry: Suitable for treating effluents containing biodegradable organics.
- Argo-based Industries: Used for wastewater from processing units such as potato, starch, and vegetable processing.
Parameter Reduction Table
| PARAMETER | INFLUENT LEVEL | EFFLUENT LEVEL | REDUCTION (%) |
| Chemical Oxygen Demand (COD) | 1,500-80,000 mg/L | 300-800 mg/L | 70-80% |
| Biochemical Oxygen Demand (BOD) | 800-2, 5000 mg/L | 150-400 mg/L | 75-85% |
| Total Suspended Solids (TSS) | 500-1,500 mg/L | 100-300 mg/L | 70-80% |
| Volatile Fatty Acids (VFA) | 200-600 mg/L | 30-100 mg/L | 70-85% |
| pH | 6.5-8.0 | 6.8-7.5 | Stable |
Capacity
UASB digesters are scalable and can be designed for a wide range of capacities, from small community plants to large-scale industrial applications. Typical capacities include:
- Small-scale: 50-500 m3/day – suitable for small towns or industrial units.
- Medium-scale: 500-5,000 m3/day – commonly used in municipal sewage treatment plants.
- Large-scale: 5,000-50,000 m3/day – deployed for metropolitan cities and major industrial complexes.
