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Rehabilitating a Complex 500 m³/day MBR-RO Treatment System
Green Dimension was engaged to assess and rehabilitate a 500 m³/day landfill leachate treatment plant at Wadi Al-Asala in Jeddah. The facility incorporates a complex multi-stage treatment train combining chemical conditioning, clarification, biological treatment, membrane bioreactor technology, filtration and reverse osmosis.
Green Dimension completed a structured condition assessment, identified failures across mechanical, electrical, instrumentation and membrane systems, and executed a sequenced maintenance, repair and rehabilitation program. The work was delivered under successive work orders, with commissioning and operational testing preceding final handover.
m³/day
Plant Capacity
Tasks
Rehabilitation Program
Systems
Fully Rehabilitated
Operational
Commissioned
Landfill leachate is one of the most difficult wastewater streams to treat. It is formed as water passes through deposited waste and carries dissolved and suspended contaminants into a concentrated liquid stream. Its composition can vary significantly over time and may include high organic loading, ammonia, suspended solids, dissolved salts, metals and other difficult-to-treat constituents.
At the Wadi Al-Asala landfill in Jeddah, a dedicated 500 m³/day leachate treatment plant had experienced extensive deterioration across its process, mechanical, electrical, instrumentation and membrane systems. A previous technical inspection had identified the facility as largely non-operational, requiring more than routine maintenance or isolated equipment replacement.
Al Yamama Company for Trading and Contracting, acting in connection with the Jeddah Municipality landfill facility, engaged Green Dimension to provide the technical assessment and engineering support required for a structured maintenance, repair and rehabilitation program.
Green Dimension began with a stage-by-stage condition assessment covering the complete treatment process. The purpose was not only to identify damaged equipment, but also to understand how failures interacted across the plant.
The assessment reviewed:
For example, unreliable flow readings can prevent effective dosing control. Inaccurate pH or oxidation-reduction-potential measurements can affect chemical and biological treatment. Inadequate aeration can destabilize the biological process, while membrane fouling or damaged modules can reduce filtration performance and increase the load on the reverse-osmosis stage.
This systems-based assessment allowed Green Dimension to distinguish isolated equipment faults from wider process-control and integration issues.
Following the assessment, Green Dimension developed and executed a structured maintenance, repair and rehabilitation program comprising 57 defined tasks, programmed over approximately six months.
The program addressed the plant as an integrated process rather than a collection of independent assets. Key workstreams included:
pH measurement Oxidation-reduction-potential monitoring Dissolved-oxygen monitoring Conductivity measurement Flow measurement Level instrumentation Dosing controls Process alarms and operating logic The rehabilitation strategy was built around restoring each treatment barrier in the correct sequence. The rehabilitation sequence first restored the preliminary and chemical stages to provide stable feed conditions for biological treatment. Coagulation, flocculation and clarification reduce suspended material and condition the wastewater before biological treatment.
The biological process then addresses biodegradable organic matter and nitrogen compounds through anoxic and aerobic treatment. The available process documentation describes operation with oxidation-reduction-potential control in the anoxic stage and fine-bubble aeration in the aerobic stage.
The restored MBR stage provides biological solids separation and membrane filtration before the treated stream proceeds through multimedia and cartridge filtration. Reverse osmosis then functions as the final advanced polishing barrier.
Hydraulic balance Chemical dosing Biological stability Aeration performance Membrane integrity Solids management Instrument reliability Control-system logicThis sequence reduces the risk of rehabilitating downstream equipment before upstream conditions are capable of supporting stable operation.
Green Dimension’s role extended beyond assessment and planning to include engineered equipment supply, process restoration, site implementation and recommissioning. The project records include successive work orders covering engineered spare parts, MBR and RO components, dosing systems, instrumentation and treatment chemicals used during the rehabilitation program.
Equipment and component selection must account for the aggressive nature of leachate, the process duty, compatibility with existing systems and the operating requirements of the treatment plant.
This integrated scope is particularly important for ageing treatment plants where failures have developed across multiple disciplines.
Green Dimension delivered the rehabilitation under work orders issued from September 2023, with additional works ordered in November 2024. Commissioning and operational testing precede final handover.
During commissioning and operational testing, the complete treatment system is operated and monitored to verify process stability, equipment performance, control-system functionality and treatment consistency. The results will support final optimization, performance confirmation and formal handover to the client.
This project demonstrates Green Dimension’s ability to diagnose and rehabilitate advanced wastewater-treatment infrastructure rather than simply replace isolated equipment.
The Wadi Al-Asala plant combines physical, chemical, biological and membrane processes within one treatment train. Restoring such a system requires the ability to understand interactions between wastewater characteristics, process chemistry, biological performance, mechanical reliability, membrane condition, instrumentation and control logic.
The engagement also illustrates the strategic value of treatment-plant rehabilitation. Where the underlying process infrastructure remains recoverable, a structured rehabilitation program can restore the value of an existing asset without requiring complete plant replacement.
For landfill operators and municipal authorities, reliable leachate treatment is essential to controlling one of the principal environmental risks associated with final waste disposal. The project therefore sits at the intersection of waste management, industrial wastewater treatment and environmental protection.
Landfill leachate treatment plant capacity
Structured assessment of the complete treatment train
Maintenance, repair and rehabilitation program
Chemical, biological, MBR, filtration and RO stages
Mechanical, electrical, instrumentation and membrane
From parts supply to commissioning and handover
Green Dimension provides condition assessment, process troubleshooting, rehabilitation engineering, equipment replacement and recommissioning support for complex water and wastewater treatment facilities across Saudi Arabia.
