Nigeria POME Biogas Project: USR Process and GFS Tanks for Palm Oil Wastewater
Nigeria's expanding palm oil sector generates substantial volumes of POME, and turning this wastewater into a functioning Biogas Project is becoming a practical path toward both environmental compliance and energy recovery. This article explains how the USR Process and GFS Tanks help Nigerian mills convert palm oil effluent into usable renewable energy.
Palm Oil Production and Wastewater Treatment Challenges in Nigeria
Nigeria is home to one of Africa's largest palm oil industries, with mills spread across the southern states processing significant volumes of fresh fruit bunches. This activity generates large quantities of Palm Oil Mill Effluent (POME), a high-strength organic wastewater with elevated COD and BOD levels that poses serious risks if released untreated. Many smaller and mid-sized mills still rely on open lagoon systems, which are land-intensive, slow to treat effluent, and allow methane to escape into the atmosphere uncontrolled. Nearby rivers and farmland can suffer from pollution and odour issues as a result. As Nigeria works to strengthen environmental oversight and expand access to reliable power in rural areas, palm oil mills increasingly need enclosed, engineered treatment systems that both protect the environment and recover the energy value locked within this abundant organic waste stream.
Converting POME into Biogas
Instead of treating POME purely as waste, many Nigerian mills are beginning to view it as raw material for a Biogas Project. 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 ahead of digestion. The conditioned wastewater then enters an anaerobic digester, where microorganisms break down organic matter in an oxygen-free environment, generating methane-rich biogas. Once dehydrated and desulfurized, this biogas can fuel boilers, power biogas generators to supply electricity to mill operations or nearby communities, or be refined into compressed natural gas (CNG) for local transport use. The remaining digestate splits into liquid fertilizer for direct application on plantation land and fibrous solids suitable for composting, supporting more self-sufficient, circular mill operations.
The USR Process Explained
A key technology behind Nigerian POME treatment systems is the USR Process, or Upflow Solids Reactor, an anaerobic digestion approach well matched to organic wastewater with total solids content of 3% to 6%. Wastewater moves upward through the reactor and passes through an active solid bed, where microbial communities degrade organic pollutants while biogas rises into 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 even with variable feedstock quality.
Center Enamel's Professional Design Solutions for Biogas Projects
A reliable Biogas Project 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 Nigerian 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, helping mills achieve dependable, long-term treatment performance.
GFS Tanks and Double Membrane Roof
Two core products underpin Center Enamel's biogas 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, an important advantage for mills in remote regions with limited access to skilled welding labor. Paired with a Double Membrane Roof, the system provides 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 Nigerian mill settings.
Center Enamel's Range of Storage Tanks and Roof Solutions
In addition to GFS Tanks, Center Enamel offers a variety 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, providing 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 build a complete Biogas Project, 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 in areas with limited local technical infrastructure. Center Enamel supports Nigerian 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 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 Nigeria:
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
Tank Application：Palm oil wastewater treatment plant
Tank Model: Ø19.86* 8.4m
Tanks Quantity: 3 nos. of GFS tanks
Installation：7 people, 40 days
Installation Date: Nov, 2009
Malaysia Palm Oil Wastewater Treatment Project
Installation date：2021
Design inlet and effluent water quality
Inlet water: COD≥60000mg/L; BOD≤25000mg/L
Effluent: COD≥12000mg/L; BOD≤5000mg/L
Design effective volume, digestibility
Single GFS tank: 5400m³ (Ø24.46*12m)
Total effective volume of 5 tanks is 27000m³
Digestibility: ≈ 80%
Conclusion
Nigeria's palm oil industry has a real opportunity to convert POME from an environmental burden into a source of renewable energy and rural power supply. Using the USR Process for reliable biological treatment and GFS Tanks paired with Double Membrane Roofs for durable, air-tight containment, mills can recover biogas consistently while addressing environmental concerns. With Center Enamel's engineering and equipment support, Nigerian producers gain a practical, dependable route to a fully functioning Biogas Project.
Frequently Asked Questions
Q1: Why is the USR Process a good fit for Nigerian palm oil mills?
The USR Process handles organic wastewater with 3% to 6% total solids content effectively, matching typical POME characteristics found across Nigerian mill operations.
Q2: How do GFS Tanks perform in remote installation locations?
GFS Tanks use modular bolted assembly rather than field welding, allowing reliable construction even in areas with limited access to skilled welding labor.
Q3: What role does the Double Membrane Roof play in a biogas project?
The Double Membrane Roof provides an air-tight, cost-effective tank cover that lowers construction costs and reduces the space needed compared with traditional ground-mounted gas holders.