Biogas Tanks: What You Need to Know Before Installing on a Farm or Estate

With rising energy costs and growing environmental concerns, farms and estates across India are turning to biogas technology as a clean and sustainable energy solution. Biogas systems convert organic waste—such as animal manure, crop residues, and kitchen waste—into usable fuel for cooking, heating, and even electricity generation.

At the core of this system is the biogas tank, a specially designed container where organic matter breaks down anaerobically (without oxygen) to produce methane-rich gas.

In this blog, we’ll explore everything you need to know about biogas tanks—from their design and benefits to installation and maintenance—so you can make an informed decision before setting up one on your farm or estate.

What Is a Biogas Tank?

A biogas tank (also known as a biogas digester) is a sealed container made from durable materials like plastic, concrete, or metal. Inside the tank, organic waste is decomposed by bacteria under anaerobic conditions, producing a mixture of gases—mainly methane (CH₄) and carbon dioxide (CO₂).

This biogas can then be used for:

• Cooking and heating on farms.
• Powering biogas generators for electricity.
• Fuel for farm machinery or vehicles after purification.
• Producing organic fertilizer (the slurry residue).

Benefits of Installing a Biogas Tank on Your Farm

1. Sustainable Energy Source

Biogas offers a renewable alternative to LPG, diesel, or firewood. Since it’s produced from organic waste, it supports energy independence and reduces reliance on non-renewable resources.

2. Reduces Waste and Pollution

A biogas tank helps manage animal and agricultural waste efficiently. Instead of dumping waste into open pits or water bodies, it’s converted into useful gas—minimizing odour, pathogens, and greenhouse emissions.

3. Produces Organic Fertilizer

The byproduct of biogas production—known as digestate or slurry—is a nutrient-rich organic fertilizer that can be used directly on crops, reducing the need for chemical fertilizers.

4. Low Operating Cost

Once installed, the operating and maintenance costs are minimal. Biogas systems run continuously with a steady supply of organic waste.

5. Supports Environmental Conservation

By reducing methane release into the atmosphere and cutting down deforestation for firewood, biogas systems help lower the overall carbon footprint of farms and estates.

Key Factors in Biogas Tank Design

When planning your biogas tank design in India, consider these important factors:

1. Tank Material

• Plastic/Polymer Tanks: Lightweight, corrosion-resistant, and easy to install. Ideal for small to medium farms.
• Concrete Tanks: Durable and suitable for large-scale operations, but need professional installation.
• Metal Tanks: Strong but susceptible to rust and corrosion without proper coating.

Ocean Group’s biogas tanks are made using rotational moulding technology, ensuring durability, leak-proof performance, and weather resistance—perfect for long-term agricultural use.

2. Tank Size and Capacity

The capacity depends on the amount of organic waste generated daily. For example:

• A small farm (2–3 cattle) may need a 2–3 m³ tank.
• Medium-sized farms may require 6–10 m³ tanks.
• Large estates or dairy farms might install tanks above 20 m³.

Choosing the correct size ensures efficient gas production and storage.

3. Gas Storage Chamber

A well-designed biogas tank includes a floating or fixed gas holder to store the produced methane safely before usage.

4. Temperature Regulation

Biogas production efficiency depends heavily on temperature. Tanks should be placed in areas with adequate sunlight to maintain bacterial activity.

5. Safety and Ventilation

Safety valves and vents are essential to prevent gas pressure build-up. Always ensure proper sealing and regular inspections.

Steps for Farm Biogas Tank Installation

Here’s a simplified step-by-step guide to installing a farm biogas tank:

1. Site Selection:
   Choose an elevated area with easy access to waste input (animal sheds, kitchens) and gas output points.
2. Foundation Preparation:
   Lay a stable foundation of compacted soil or concrete to support the tank’s weight.
3. Tank Placement:
   Position the tank vertically, ensuring inlet and outlet pipes are aligned with waste input and slurry discharge points.
4. Piping and Gas Outlet Installation:
   Connect the inlet pipe (for organic waste slurry) and outlet pipe (for fertilizer). Attach a gas outlet to connect the digester to stoves or biogas generators.
5. Testing and Commissioning:
   Fill the tank halfway with water and organic waste, then seal it. After 10–15 days, the system begins generating usable gas.
6. Safety Check:
   Test for leaks, secure all joints, and install safety valves for pressure control.

Maintenance Tips for Long-Term Performance

A well-maintained biogas tank can last 15–20 years or more. Here are a few maintenance practices to follow:

Stir the Slurry Occasionally: Stirring prevents the formation of solid layers and ensures better gas output.

Feed Consistently: Add waste in regular quantities daily or weekly to keep gas production steady.

Avoid Chemicals: Do not add soap, bleach, or pesticides, as they kill the bacteria necessary for biogas generation.

Clean Inlet & Outlet Pipes: Prevent blockages by checking and cleaning pipes regularly.

Inspect for Cracks or Leaks: Especially in plastic or metal tanks, check seals and valves periodically.

Choosing the Right Biogas Tank Manufacturer

Selecting a reliable manufacturer ensures safety, efficiency, and durability. Ocean Group, one of India’s leading polymer product manufacturers, provides high-quality biogas tanks designed for:

• Rural and agricultural use
• Eco-friendly waste management systems
• Easy installation and maintenance

Their tanks are:

• ISI-certified and UV-stabilized
• Leak-proof and corrosion-resistant
• Available in multiple sizes and models

Whether you manage a small family farm or a large agricultural estate, Ocean Group’s renewable energy storage tanks help you turn waste into valuable energy.

A biogas tank is more than just a waste-management system—it’s a step toward sustainable farming and energy independence. By converting waste into usable biogas and organic fertilizer, farms can reduce pollution, save costs, and promote a greener future.

With the right biogas tank design, professional installation, and regular maintenance, your farm can benefit from clean energy for years to come.

If you’re looking for reliable, durable, and efficient biogas tanks in India, explore Ocean Group’s range of renewable energy storage tanks—designed for farms, estates, and industries committed to sustainability.