Biogas Technology for Cameroon’s  POME Treatment: Leading USR Process and GFS Tanks Solution

Cameroon's palm oil mills produce large quantities of POME, and applying modern Biogas Technology gives producers a practical route to cleaner wastewater management and renewable energy recovery. This article explains how the USR Process and GFS Tanks help Cameroonian mills transform palm oil wastewater into a valuable energy source.

Palm Oil Production and Wastewater Treatment Challenges in Cameroon

Cameroon is one of Central Africa's most significant palm oil producers, with mills concentrated in the country's coastal and forest regions processing fresh fruit bunches throughout the year. This activity generates large volumes of Palm Oil Mill Effluent (POME), a high-strength organic wastewater with elevated COD and BOD levels that can cause serious environmental harm if released untreated. Many mills continue to rely on open lagoon treatment systems, which demand extensive land area, offer inconsistent treatment performance, and allow methane emissions to escape uncontrolled into the atmosphere. Nearby waterways and communities can be affected by pollution and persistent odour issues. As Cameroon works to strengthen environmental standards in the agro-industrial sector and improve rural energy access, palm oil mills increasingly need enclosed, engineered treatment systems that safeguard the environment while capturing the energy value contained in this abundant wastewater stream.

Converting POME into Biogas

Instead of managing POME purely as waste, mills across Cameroon are increasingly turning to Biogas Technology to convert it into a productive resource. Treatment begins with mechanical bar screening and a horizontal flow oil separator to remove suspended solids and residual oil, followed by a regulating tank that stabilizes flow, temperature, and pH before digestion. The conditioned wastewater then enters an anaerobic digester, where microorganisms break down organic matter in an oxygen-free environment, generating methane-rich biogas. After dehydration and desulfurization, this biogas can be used to fuel boilers, run biogas generators for electricity, or be refined into compressed natural gas (CNG) for local transport applications. The remaining digestate splits into liquid fertilizer suitable for direct land application and fibrous organic solids that can be composted, supporting more self-sufficient plantation operations.

The USR Process Explained

Central to many Biogas Technology systems adopted in Cameroon is the USR Process, or Upflow Solids Reactor, an anaerobic digestion approach suited to organic wastewater with total solids content of 3% to 6%. Wastewater rises through the reactor and passes through an active solid bed, where microbial communities degrade organic pollutants while biogas collects in a built-in gas holder above the tank. Reactor sizing is based on volumetric loading, factoring in wastewater characteristics, operating temperature, and target removal efficiency, generally around 3 to 5 kg COD per cubic meter per day under mesophilic conditions. The vertical, cylindrical, air-tight tank structure, combined with a water collection and recycling system, supports stable, efficient long-term operation despite variable feedstock quality.

Center Enamel's Professional Design Solutions for Biogas Projects

Successful Biogas Technology adoption depends on engineering matched to each mill's specific effluent characteristics. Operating from a 150,000 square meter research and production base with an annual capacity of 250,000 sheets, Center Enamel's engineering team designs pretreatment, digestion, and gas utilization systems suited to conditions found across Cameroonian palm oil operations. Backed by international certifications including CE/EN1090, ISO 9001, NSF61, WRAS, and EN28765, along with design standards such as AWWA D103, OSHA, EN28765, and EuroCode, the company configures reactor sizing and process flow around each site's loading requirements, supporting reliable, long-term treatment outcomes.

GFS Tanks and Double Membrane Roof

Two core products anchor Center Enamel's Biogas Technology solutions for palm oil wastewater treatment. GFS Tanks — Glass-Fused-to-Steel tanks — are produced by fusing molten glass onto steel plate at 820°C to 930°C, forming an inert, highly corrosion-resistant surface with a double coating layer structure (2C2F) that protects both interior and exterior faces. This construction handles the acidic, high-strength nature of POME effectively, and modular bolted assembly allows much faster on-site erection than conventional construction methods, an important benefit for mills located in areas with limited access to skilled welding labor. Paired with a Double Membrane Roof, the system delivers an air-tight, cost-effective cover: this design lowers roof construction costs and reduces footprint and foundation requirements compared with traditional ground-mounted gas holders, making it well suited to anaerobic digestion and biogas storage in Cameroonian mill settings.

Center Enamel's Range of Storage Tanks and Roof Solutions

In addition to GFS Tanks, Center Enamel offers a broad range of tank and roof options to suit different site needs:

Galvanized Steel Tanks — coated through a galvanizing process for a tough, wear-resistant, corrosion-protective finish.

Fusion Bonded Epoxy (FBE) Tanks — developed with AkzoNobel, a global leader in paints and coatings, offering advanced epoxy coating protection.

Stainless Steel Tanks — available in AISI 304/316 grades for demanding storage requirements.

Aluminum Geodesic Dome Roof — offering advanced corrosion resistance, expansive clear-span coverage, and low maintenance needs.

Glass-Fused-to-Steel Roof — air-tight and cone-shaped, suitable for pressurized structures and odour control.

Single and Double Membrane Roof — the preferred air-tight cover for anaerobic digestion and biogas applications, offering an integrated, cost-effective tank top.

Stainless Steel Roof — air-tight, corrosion-resistant, suited to pressurized and harsh environments.

Aluminum Alloy Trough Deck Roof and FRP Roof — economical, non-air-tight options for potable water, agricultural, and firewater storage.

Supporting Biogas Equipment

To complete a functioning Biogas Technology system, Center Enamel also supplies essential auxiliary equipment:

Gas Holders for flexible biogas storage capacity

Lagoon/Black Membrane covers as an economical anaerobic option

Hot Water Boilers for using recovered biogas as fuel

Emergency Torch Systems for safe flaring of excess gas

Lifting Pumps for wastewater and sludge transfer

Dehydration and Desulfurization Tanks for purifying biogas before use

Screw Sludge Dewatering Machines for effective digestate solid-liquid separation

Efficient GFS Tank Installation Capability

Efficient installation matters greatly for mills operating with limited local technical infrastructure. Center Enamel supports Cameroonian projects through:

Modular, bolted panel assembly that removes the need for field welding

Factory-standardized panel production ensuring consistent quality control before shipment

Installation teams experienced with logistics and site conditions across Central and West Africa

Streamlined shipping and on-site assembly processes for GFS Tanks, shortening overall construction schedules

Careful quality inspection at every stage to ensure long-term structural performance

Center Enamel as a One-Stop Solution Provider for Biogas Projects

Center Enamel offers integrated services that reduce complexity for palm oil mill owners in Cameroon:

EPC service covering design, equipment procurement, and construction under unified project management

Process Package solutions customized to each mill's wastewater profile and energy recovery targets

Equipment Supply spanning tanks, roofs, reactors, and auxiliary systems from one manufacturer

Compliance with recognized international design and safety standards throughout each project

Experience delivering projects across more than 100 countries, backed by a team of over 500 employees

Case Studies

Indonesia Palm Oil Wastewater Treatment Project

Application：Anaerobic Reactors at Palm Oil Wastewater Treatment Plant

Tank Model：Ø17.58*8.4m, Ø16.82*7.2m   

Tanks Quantity: 3 nos. of GFS tanks   

Installation Date: 2013   

Thailand Palm Oil Wastewater Treatment Project

Tank Size: Ø29.79 * 13.8m, 9000m3

Tank Quantity: 2 nos. of CSTR GFS tanks         

Conclusion

Cameroon's palm oil sector has a genuine opportunity to convert POME from an environmental liability into a source of renewable energy. By applying Biogas Technology through the USR Process for dependable biological treatment and GFS Tanks paired with Double Membrane Roofs for durable, air-tight containment, mills can capture biogas reliably while meeting environmental expectations. With Center Enamel's engineering and equipment support, Cameroonian producers gain a practical, dependable path to sustainable palm oil wastewater management.

Frequently Asked Questions

Q1: How does Biogas Technology help Cameroon's palm oil mills reduce environmental impact? 

Biogas Technology treats POME in enclosed anaerobic systems, capturing methane that would otherwise escape into the atmosphere while producing usable renewable energy for mill operations.

Q2: What role does the USR Process play in treating high-strength POME? 

The USR Process uses an upflow solid bed design to break down organic pollutants efficiently in wastewater with 3% to 6% total solids, a range typical of palm oil effluent.

Q3: Are GFS Tanks suitable for installation in remote mill locations? 

Yes, GFS Tanks rely on modular bolted assembly rather than field welding, making them practical to install even where access to skilled welding labor is limited.