Climate-Adaptive Biogas Systems in Indonesia: A Flexible Digester Case from Henan Zonghai Plastic Industry

Project Introduction

Indonesia’s tropical climate and large agricultural sector create favorable conditions for biogas development. Livestock farms across the country generate substantial quantities of organic waste that can serve as feedstock for anaerobic digestion.

In 2024, Henan Zonghai Plastic Industry Co., Ltd. supplied flexible biogas digester equipment for a pilot farm project in West Java. The objective was to evaluate how flexible membrane digesters perform under Indonesia’s humid tropical climate while supporting farm waste management.

Environmental Conditions

The farm involved in the project raised 14 cattle, producing a steady supply of manure suitable for biogas fermentation.

Key environmental conditions included:

• Average temperature: 27–31°C
• High humidity levels throughout the year
• Frequent heavy rainfall

These conditions are generally favorable for mesophilic anaerobic digestion but can complicate the construction of underground concrete digesters.

Water infiltration and soil instability are common challenges during digester construction in tropical areas.

Project Challenges

Before adopting the biogas system, the farm faced several operational issues.

Manure storage

Cattle manure was collected in an open yard area, where it accumulated before being transported to fields.

Energy demand

The farm required fuel for cooking and occasional water heating.

Construction limitations

Building a conventional brick digester would have required excavation and masonry work that could be affected by rainfall.

A flexible digester solution was selected to simplify installation.

Equipment Supplied

Henan Zonghai Plastic Industry provided a 20-cubic-meter flexible biogas digester system designed for medium-sized livestock farms.

Technical parameters included:

Membrane composition

PVC-coated polyester reinforcement fabric

Material thickness

Approximately 1.1 mm

Sealing process

High-frequency welded seams for airtight containment

Operating temperature range

Approximately −30°C to 70°C

The digester was delivered as a foldable unit that could be transported easily to the farm.

Installation and Startup

The installation process required only a prepared soil foundation near the cattle shed.

Key installation steps included:

1. Leveling the ground surface
2. Positioning the digester body
3. Installing slurry inlet and outlet pipes
4. Connecting the gas pipeline to a kitchen stove

Because the system was modular and flexible, the installation process required minimal construction equipment.

Operating Conditions

Daily feedstock input consisted of:

• 20–25 kg of cattle manure
• Water mixed at approximately 1:1 ratio

Under local temperatures around 30°C, microbial fermentation proceeded within the digester without additional heating.

Gas produced by the system accumulated in the digester chamber and was transported through a low-pressure pipeline to the farm’s cooking area.

The digester also produced liquid digestate that flowed into a small collection tank.

Observed Results

After several months of operation, the farm integrated the digester system into routine waste management practices.

Observed benefits included:

More organized manure processing

Waste from cattle housing areas was directed into the digester rather than accumulating in open yards.

Energy generation

Biogas was used for cooking activities within the farm household.

Reuse of digested slurry

The slurry was applied to nearby crop fields as organic fertilizer.

These outcomes demonstrate how flexible digesters can operate effectively within tropical agricultural systems.

Conclusion

Indonesia’s warm climate and livestock farming structure create conditions well suited for anaerobic digestion technologies. Case studies such as this West Java installation show how flexible membrane digesters can provide a practical alternative to conventional underground systems.

By supplying modular digester equipment adapted to tropical agricultural environments, Henan Zonghai Plastic Industry Co., Ltd. contributes to the broader adoption of decentralized biogas solutions across Southeast Asia.

Such projects highlight the role of material engineering and adaptable system design in expanding renewable energy applications in rural farming communities.