The Simandou mine in Guinea ranks among the largest mining and infrastructure developments in Africa. Located in the country’s southeast, the project is transforming one of the world’s most significant untapped high-grade iron ore deposits into a major global resource hub. As mining operations continue to expand, the surrounding infrastructure is growing at the same pace. New accommodation areas, workforce camps and technical facilities are driving a sharp increase in wastewater generation.
The remote location of the mine creates major challenges for conventional wastewater infrastructure. Long construction schedules, extensive civil works and difficult logistics slow down traditional treatment projects throughout the region. At the same time, the workforce at the site continues to grow steadily, increasing the volume of domestic wastewater generated by the camp facilities every day.
The wastewater itself shows highly variable loading conditions. Organic matter, suspended solids, fats and sludge place significant stress on downstream treatment processes. The operator therefore required a robust and reliable solution for both mechanical and biological wastewater treatment. In addition, a modern mining project of this scale demands strict environmental standards and consistently stable treatment performance.
Rio Tinto follows clear ESG and sustainability objectives at the Simandou site. Protecting local ecosystems and water resources forms an essential part of the project strategy. As a result, the wastewater treatment system needed to deliver dependable operation and stable effluent quality under demanding conditions.
The project timeline added further pressure. The mine required a fully operational treatment plant within a very short period and without lengthy on-site construction works. At the same time, the customer wanted to evaluate the performance of the technology under real operating conditions. For this reason, Rio Tinto initially selected a flexible rental solution with a future purchase option.
The requirements for wastewater treatment at Simandou were exceptionally demanding. The site is located in a remote and logistically challenging part of West Africa, where transportation, installation and commissioning activities involve considerable effort and cost. Conventional treatment plants require large footprints, extensive concrete works and long implementation periods. These conditions did not align with the rapid development schedule of the mine.
At the same time, both hydraulic and biological wastewater loads fluctuate significantly. Workforce numbers within the camp change regularly, creating varying inflow volumes and load peaks. The treatment technology therefore needed to absorb these fluctuations continuously while still maintaining stable treatment efficiency.
Operational reliability and ease of maintenance also played a critical role. The plant operates in a remote environment with demanding climatic and operational conditions. Long service distances and limited spare part availability require durable and straightforward process technology with high operational stability.
In addition, the treatment plant needed to be available almost immediately. The operator required a solution that arrived ready for operation without lengthy installation works on site. Mobility also remained important in order to preserve flexibility for future modifications or relocation.
Future expansion already formed part of the project considerations as well. The Simandou mine continues to grow steadily, and wastewater volumes are increasing alongside the expanding infrastructure. The operator is therefore already evaluating a future extension of the existing wastewater treatment capacity.
For the Simandou mine, PPU Umwelttechnik supplied a containerised ClearFox® CF-C-50 wastewater treatment plant together with a ClearFox® CSU pretreatment unit. The entire system operates as a compact plug-and-play solution and achieved operational readiness on site within a very short timeframe.
The ClearFox® CSU handles the mechanical pretreatment stage. The system reliably removes solids, sand, grit, fats and oils from the incoming wastewater stream. An integrated screw screen separates coarse solids while simultaneously compacting and dewatering the screenings directly inside the unit. In the next stage, the integrated grit chamber removes mineral particles from the wastewater flow. Finally, fats and oils are separated using a surface-mounted skimming system. This pretreatment process protects the downstream biological stage against shock loads and unwanted deposits.
After pretreatment, the wastewater enters the ClearFox® CF-C-50. The biological treatment plant is fully integrated into a standard 20-foot shipping container. Its compact footprint significantly reduces space requirements while simplifying transportation to the remote mining site.
The first half of the container contains the biological fixed-bed treatment module. Here, PPU uses its proven ClearFox® fixed-bed reactor technology. Microorganisms grow on specially engineered carrier media with high specific surface areas. The wastewater passes through several cascaded reactor chambers, maintaining the biological degradation rate continuously within the optimal operating range. At the same time, each treatment stage develops a specifically adapted microbial community. This configuration substantially improves process stability and enhances the biological removal of organic pollutants and nitrogen compounds.
An integrated aeration system continuously supplies oxygen to the biomass, ensuring stable and efficient biological treatment performance. Even under fluctuating load conditions, the system maintains consistently high treatment efficiency.
The second half of the container houses the ClearFox® lamella clarifier together with the integrated technical equipment. Inclined lamella plates significantly increase the effective settling area, enabling reliable solid-liquid separation within a very compact footprint. This design allows the system to achieve high clarification performance despite limited installation space.
The delivered plant treats up to 50 m³ of wastewater per day. The required buffer volume is located outside the container and is either provided by the customer or integrated through an additional external buffer solution. This modular concept substantially increases overall system flexibility.
Rapid availability formed one of the project’s key success factors. PPU delivered the plant to Guinea as a flexible rental solution, allowing Rio Tinto to evaluate the technology directly under real operating conditions. At the end of the rental period, the customer retains the option to purchase the system.
The modular design also creates ideal conditions for future expansion. Project stakeholders are already discussing an increase in treatment capacity. Thanks to the containerised concept, PPU expands the system quickly and without major reconstruction works. This combination of mobility, modularity and robust process engineering makes ClearFox® systems particularly attractive for demanding mining and infrastructure projects worldwide.
Yes. ClearFox® systems are particularly well suited for remote industrial, mining, infrastructure and camp locations with fluctuating wastewater volumes. Thanks to their modular design, PPU tailors each system precisely to the specific hydraulic and biological requirements of the project. The systems reliably treat both domestic camp wastewater and industrial wastewater streams.
ClearFox® containerised treatment plants achieve operational readiness within a very short time. Since the microorganisms first need to establish themselves on the fixed-bed media, the system reaches its full biological treatment performance after approximately six to eight weeks. PPU delivers the systems fully preassembled, eliminating lengthy construction phases and extensive concrete works. After transportation to site, only utility connections and commissioning are required.
The systems are based on standardized 20-foot and 40-foot shipping containers. This allows PPU to transport the units worldwide by truck, ship or rail. The compact footprint significantly reduces space requirements and simplifies logistics in hard-to-access regions.
The systems treat municipal, domestic and industrial wastewater. Typical applications include mining camps, construction sites, industrial facilities, hotels, workforce camps and decentralized infrastructure projects. The treatment processes reliably remove organic pollution, nitrogen compounds, suspended solids, fats and oils.
ClearFox® fixed-bed technology delivers exceptional process stability under fluctuating inflow volumes and peak loads. Different microbial communities develop within the cascaded reactor chambers, ensuring consistently high biological degradation performance. This keeps treatment efficiency stable even under demanding operating conditions.
The systems meet high international wastewater treatment standards. Depending on the system configuration, ClearFox® technology achieves effluent qualities suitable for direct discharge, water reuse or irrigation. The systems operate using proven biological and mechanical treatment processes in accordance with international standards and DWA guidelines.
