According to several sources consulted, designing and constructing a biogas digester tank involves several critical factors to ensure efficiency, safety, and sustainability. Here are some key considerations:

1. Type of Digester: The choice between fixed dome, floating drum, or plug flow digesters depends on the specific needs and available resources.

2. Feedstock: The type of organic material used (e.g., agricultural waste, animal manure, food waste) affects the design and operation of the digester.

3. Temperature: Maintaining optimal temperatures (mesophilic: 10-40°C, thermophilic: 45-57°C) is crucial for efficient biogas production.

4. pH Levels: For optimal microbial activity, the pH value should be monitored and maintained between 6.5 and 7.5.

5. Retention Time: The hydraulic retention time (HRT) determines how long the feedstock remains in the digester, affecting the biogas yield.

6. Construction Materials: The materials used should be durable, corrosion-resistant, and able to withstand the local environmental conditions.

7. Gas Storage: Proper gas storage systems are essential to safely store and utilize the produced biogas.

8. Mixing and Stirring: Regular mixing of the digester contents ensures uniform digestion and prevents the formation of scum layers.

9. Insulation: Adequate insulation helps maintain the necessary temperature inside the digester, especially in varying climatic conditions.

10. Safety Measures: Implementing safety measures to handle biogas, a flammable gas, is crucial to preventing accidents.

11. Economic and Environmental Impact: Assessing the cost-effectiveness and environmental benefits of the biogas plant is important for long-term sustainability.

These factors will help design an efficient and effective biogas digester tank suitable for local conditions in India.

Jorge Morales Pedraza Your 11 elaborative points are self-explanatory and they explain most of the requirements. and let us wait for other experts to understand once they add their views....