Biodigester Septic Systems

What is a Biodigester Septic Tank?

A biodigester septic system is a sustainable solution for managing waste and sewage in the long term. This method enables the recycling of water and the production of biogas through environmentally friendly solutions.

The system has a sealed chamber where bacteria decompose organic matter and waste from wastewater in an oxygen-free environment. Within the bio-digester, the decomposition process generates biogas, reusable water, and in some cases bio-fertilizer. These nutrients have a lot of organic nutrients so they add to the fertilization of soil, promoting growth and maintaining soil health.

The biodigester septic system has many advantages, including, low maintenance, recycling water, and creating organic fertilizer, which contributes to environmental sustainability and cost savings.

How Do Biodigester Septic Systems Work?

The biodigester septic system functions based on anaerobic digestion, a natural process in which bacteria decompose organic waste without oxygen. The chemical reactions transform the waste into (biogas), carbon dioxide, and water.

Anaerobic digestion is a natural process that occurs in environments that don’t have oxygen, such as certain soils and sediments of lakes or ocean basins. A biodigester tank replicates this process in a well-monitored,, man-made setting, allowing for sustainable waste management and the production of carbon-neutral biogas on your property with little to no environmental impact.

To ensure a biodigester operates efficiently, there are crucial things to take into consideration:

• Insulation: Adequate insulation is required to keep a consistent internal temperature, which is essential for the fermentation process throughout the year. Temperature changes can disrupt bacterial activity, leading to reduced biogas production.

• Corrosion Resistance: All materials used in the tank must be immune to corrosion to ensure durability and prevent contamination, this could lead to health and environmental problems.

• Airtight Chamber: The tank must be completely sealed to prevent the uncontrolled flow of water and gas, which safeguards the surrounding soil and maintains the oxygen-free environment necessary for anaerobic digestion.

• Durability: The tanks should be constructed with quality materials to ensure long-term sustainability, preventing structural issues and leakage that could destroy the system’s performance and safety.

Depending on the design of the system and its use, the biodigester systems may feature multiple chambers. This design allows for the separation of solid waste from liquid waste also known as blackwater. This creates a balance within the system that encourages bacterial digestion and biogas production.

Systems that use aerobic digestion need an electric pump that provides oxygen to bacteria, this allows the bacteria to break down the waste. Aerobic systems operate more efficiently but they require more energy and maintenance compared to anaerobic biodigesters.

Moreover, the byproducts of the digestion process, such as nutrient-rich sludge, can be collected and used as bio-fertilizers, enhancing soil fertility and supporting environmentally friendly agriculture. The water generated can be treated and repurposed for irrigation or other non-potable uses.

Types of Biodigester Septic Systems

Choosing the Right Material for Your Climate

There are many types of biodigester tanks the varieties vary accommodate different needs and ensure effective fermentation across diverse climates.

The most commonly used materials for these tanks are:

• Concrete: Suitable for all weather conditions, particularly in hot and cold climates. Concrete is durable but may require treatment to prevent cracking in extreme cold.
• Plastic: Effective in climates, particularly in wet or corrosive environments, though it may become brittle in extreme cold.
• Synthetic Resin Paint: Versatile across all climates, especially effective in extreme conditions, offering protection against moisture and UV exposure.
• Bitumen Coat with Aluminum Foil: Best for hot and sunny climates, as the aluminum foil reflects heat and the bitumen provides waterproofing.
• Bitumen: Optimal for humid and rainy climates due to its waterproofing properties, though it may soften in extremely hot conditions.
• Steel: Best suited for cold to moderate climates. Steel can rust in humid or coastal environments unless properly treated or coated.
• Masonry: Ideal for moderate climates. It performs well with temperature fluctuations but may need sealing in very wet or cold conditions.
• Paraffin: Suitable for moderate to cold climates. Paraffin acts as a moisture barrier but may degrade or melt in high heat.
• Wood (rarely used): Appropriate for cold or moderate climates but can degrade quickly in wet or humid conditions unless treated with preservatives.

Biodigester Septic Systems vs. Traditional Septic Systems

Waste Treatment:

Biodigesters use anaerobic digestion to break down waste, producing biogas, fertilizer and reusable water. Traditional septic systems simply store waste, breaking it down into sludge without generating useful byproducts.

Maintenance:

Biodigesters require minimal maintenance and less frequent servicing. Traditional systems need regular emptying and are more labor-intensive to maintain.

Environmental Impact:

Biodegester captures methane to create biogas, reducing greenhouse gas emissions. Traditional systems release methane into the atmosphere, contributing to pollution.

Versatility:

Biodigesters can handle a wider range of organic waste. Traditional systems are limited to human waste and wastewater.

Biodigesters are a sustainable, low-maintenance, and eco-friendly alternative to traditional septic systems, offering greater environmental benefits and producing valuable byproducts. Traditional systems are less sustainable and require more upkeep.

Advantages and Disadvantages of Biodigester Septic Systems

Benefits of Biodigester Septic Systems

• Low Maintenance: Pre-assembled systems require minimal upkeep once installed, reducing long-term maintenance costs.

• Biogas Production: Captures methane for use as biogas, which can replace fossil fuels for cooking, heating, or electricity.

• Water Recycling: Treats and recycles black water for agricultural use of irrigation, supporting water conservation.

• Fertilizer Production: Produces nutrient-rich, organic fertilizer that enhances soil health and supports sustainable farming.

• Environmental Impact: Reduces greenhouse gas emissions by capturing methane, making it a more eco-friendly option.

• Cost Savings: Converts waste into energy and fertilizer, providing significant long-term financial benefits.

Limitations of Biodigester Septic Systems

• Complex Installation: Underground systems can be complex and costly to install, requiring specialized expertise.

• Regulatory Compliance: Must meet local environmental regulations, which can limit options and compliance installation.

• Not Universally Suitable: Effectiveness can vary based on climate, soil, and property size, making it less practical in some areas.

• High Initial Cost: Upfront costs include the system, installation, and potential infrastructure modifications.

• Odor Issues: May produce odors if not properly managed, especially during initial setup or if the system becomes unbalanced.

• Usage Dependency: Effectiveness can decline if non-organic waste or chemicals are introduced, requiring ongoing monitoring.

Steps for Installing Biodigester Septic Systems

• Choose the Site: Select a location for the biodigester that is well-drained and away from water sources.

• Excavate the Area: Dig a hole large enough for the biodigester tank, ensuring it’s deep enough for proper installation and connection.

• Prepare the Tank: Clean the tank and check for necessary fittings or connections before placing it in the hole.

• Install the Tank: Lower the tank into the hole carefully, making sure it is level and correctly positioned.

• Make Connections: Attach the inlet and outlet pipes. The inlet should connect from the house, and the outlet should lead to the drainage field.

• Backfill the Hole: Fill in the hole with soil once the tank and connections are secure, compacting the soil to avoid future settling.

• Test the System: Fill the tank with water to check for leaks and verify that the system is working properly.

• Complete the Installation: Place a lid on the tank and restore the surrounding area, ensuring maintenance access points are clear.

• Ongoing Maintenance: Regularly inspect the system for issues and schedule maintenance as needed to keep it functioning well.

For a visual guide, watch this YouTube Video: How to Install a Biodigester Septic

Maintaining Biodigester Septic Systems

Regular Feeding and Bacterial Activity Boost

• Feed Regularly: Add organic materials consistently. For toilet-linked systems, use them regularly to maintain operation.

• Boost Bacterial Activity: Occasionally add fresh cow dung to enhance bacteria levels and improve digestion efficiency

Monitoring and Adjusting System Components

• Monitor Gas Pressure: Regularly check for blockages or leaks and ensure adequate gas outlet.

• Check Water and Sludge Levels: Monitor the tank’s internal levels to avoid blockages or system failures.

• Observe Temperature: Maintain the tank’s temperature within the optimal range for effective bacterial digestion.

Tips for Ensuring Long-Term Efficiency

• Periodically Check Pipes: Ensure inlet and outlet pipes are clear and in good condition to prevent blockages.

• Inspect Seals and Lids: Make sure seals are airtight and lids are securely fastened to maintain anaerobic conditions.

• Plan for Desludging: Schedule regular desludging to prevent the buildup of waste that could compromise system performance.

• Follow Usage Guidelines: Avoid introducing chemicals, plastics, or non-organic waste that could harm bacterial activity.

While maintaining a biodigester septic system is generally straightforward, the process can be time-consuming and may feel daunting, especially if you’re unfamiliar with the technical aspects. For those who prefer expert assistance or want to ensure their system operates at peak efficiency, professional maintenance services are available. You can get help with regular upkeep, repairs, and system optimization from experienced professionals at Blue Flames Biodigesters, ensuring your systems remain in excellent condition with minimal hassle.

Biodigester Septic Systems Prices in Kenya

Several factors affect the cost of biodigester septic tanks in Kenya. These include:

• Size of the System: Larger systems cost more due to the higher capacity and additional materials required.

• Material Choice: Systems made from durable materials like reinforced concrete or high-quality plastic will cost more but provide greater longevity.

• Labor: Installation costs can vary depending on the complexity of the installation and the expertise required.

• Additional Features: Systems with added features like enhanced biogas collection or advanced filtration will generally be more expensive.

Choosing Quality Over Cost

While the upfront cost of a bio-digester septic system might be higher, choosing Biozone ensures substantial long-term saving. Biozone offers durability, has efficient systems that lower maintenance costs and last longer. Unlike traditional systems requiring frequent and expensive exhauster services, Biozone’s bio-digester systems typically needs pumps-outs only every few years, based on usage and capacity.

In Kenya, bio-digester systems range from Ksh 95,000 to Ksh 300,000, depending on size, materials, and features. Investing in Biozone means securing a cost-effective, high-quality solution that minimizes maintenance and maximizes value.

We customize our prices to suit your needs. Book a call for a consultation with Biozone today!

FAQ’s

How Long Does Installation Take?

Installation Time: The installation of a biodigester septic tank can take anywhere from 3 days to 1 week depending on the complexity of the system and the site’s conditions.

Can Shower Water Be Processed by Biodigesters?

Yes: Shower water, along with kitchen and laundry wastewater (collectively known as greywater), can be processed by a biodigester septic tank, as long as it is free of harmful chemicals and detergents.

What Waste Types Are Suitable?

Organic Waste: Biodigesters can handle organic waste, including food scraps, human waste, and certain types of greywater. Avoid introducing chemicals, plastics, or other non-biodegradable materials.

How to Manage Heavy Rainfall Impact

Drainage Solutions: To prevent flooding or system overflow, ensure the biodigester is installed in a well-drained area and that the tank has proper drainage outlets to manage excess water.

Safe Distance From Residential Structures

For residential use, bio-digester septic tanks should be placed 2 to 50 meters away from the house. For larger setups, such as those in commercial or industrial settings, the tanks may need to be placed 100 to 300 meters away.

Conclusion

When selecting biodigester septic systems, it’s essential to consider your specific environmental conditions, waste management needs, and long-term sustainability goals. Factors such as local climate, soil type, property and the amount of waste generated will significantly influence the system’s performance. Proper evaluation and planning, including consulting with professionals, will help ensure that the biodigester septic systems operate efficiently and effectively, providing maximum benefits for your property and the environment.

Biodigester septic systems offer a highly sustainable solution for waste management. Unlike traditional systems, they not only treat waste but also produce valuable byproducts like biogas and nutrient-rich water, which can be reused for irrigation or energy purposes. By investing in biodigester septic systems, you can significantly reduce your environmental footprint by minimizing waste, lowering greenhouse gas emissions, and conserving water. Moreover, these systems can lead to substantial long-term cost savings by reducing the need for frequent maintenance and offering a renewable source of energy and fertilizer.

Overall, choosing biodigester septic systems is a forward-thinking investment in both your property and the planet. It’s a step towards a cleaner, greener future, where waste is transformed into valuable resources, contributing to the global efforts of sustainable living and environmental conservation.