[Egypt] Alexandria West Wastewater Treatment Plant Introduces Sludge Thermal Hydrolysis Technology: 4 THP Systems Implemented, Digesters Reduced from 16 to 8, Plant Moves Toward Energy Self-Sufficiency

Lead Summary: 9月9日, international water treatment technology supplier Cambi announced its official entry into the Egyptian market: it has signed a contract with the Metito+Hassan Allam consortium to supply 4 Thermal Hydrolysis Process (THP) systems and ancillary equipment for the Alexandria West Wastewater Treatment Plant. THP will reduce the plant's anaerobic digesters from 16 units to 8 units, significantly increase biogas production, and is expected to reduce final solids hauled offsite by about 20 trucks × 25 tons per day, with the additional green electricity sufficient to enable the plant to achieve energy self-sufficiency. The project is supported by the European Investment Bank (EIB), the European Union, and Egyptian national funding, with equipment 2028年 delivered and 2029年 commissioned.

Project Background: Upgrading a Wastewater Treatment Plant in Egypt's Second-Largest City

Alexandria West Wastewater Treatment Plant is one of the two main wastewater treatment plants in Alexandria, Egypt's second-largest city, serving the central and western districts of the city. This retrofit will comprehensively renovate and expand the existing facilities to match population growth, and for the first time introduce biological treatment and anaerobic digestion units, enabling the effluent to consistently meet Egyptian discharge standards and reducing the pollution load affecting surrounding lakes, bays, and the Mediterranean Sea.

The project is coordinated by the Construction Authority for Potable Water and Wastewater (CAPW), with financing from the European Investment Bank (EIB), the European Union, and Egyptian national resources. It is a representative project of Egypt's municipal environmental infrastructure benchmarking against European standards. Cambi's contract signing with the consortium formed by Metito Water Treatment and Hassan Allam Construction marks the first entry into the Egyptian market for this company known for its sludge thermal hydrolysis technology.

Technical Solution: How Thermal Hydrolysis Changes the Economics of Sludge Treatment

The core logic of Thermal Hydrolysis Process (THP) is: pretreating sludge under high temperature and high pressure conditions to break cell walls and fully homogenize the sludge before it enters anaerobic digestion. For a coastal retrofit and expansion project like Alexandria West, its value is reflected in four dimensions:

• Digester count halved — THP enables digesters to operate at significantly increased loading rates, reducing the design requirement from 16 digesters to 8 digesters. Alexandria's local geological conditions are poor with high groundwater levels, making deep foundation construction for each large digester costly and difficult; reducing 8 deep foundations significantly compresses civil construction costs.
• Land savings — within the existing plant site where land is tight, the digestion unit's footprint is greatly reduced, reserving space for expansion.
• Increased biogas production — organic matter released by cell wall breaking is more readily utilized by methanogens, significantly increasing biogas production. Combined with power generation, this enables the plant to potentially achieve energy self-sufficiency, which is particularly critical for the Egyptian market where electricity prices are high and supply is unstable.
• Volume reduction and improved dewatering — sludge dewatering performance improves after digestion, greatly reducing final solids hauled offsite, equivalent to about 20 fewer 25-ton trucks per day, directly lowering disposal and transportation costs.

In addition to 4 THP systems, Cambi's supply scope also includes steam boilers, heat exchangers, and anaerobic digestion process design, covering the integrated delivery of the "thermal hydrolysis + digestion" core island.

Industry Observation: Global Spread of the Sludge-to-Energy Route

The Alexandria West project is not an isolated case. In recent years, the combination of "sludge thermal hydrolysis + advanced anaerobic digestion + biogas utilization" has been accelerating in popularity in municipal wastewater treatment plant upgrades worldwide: on one hand, it addresses sludge reduction and stabilization; on the other hand, it transforms wastewater treatment plants from energy-consuming units into energy-producing units, highly aligned with the wastewater treatment industry's transformation narrative of "carbon-neutral wastewater treatment plants." The inclusion of this route in the European Investment Bank and EU aid framework for Egypt also demonstrates that multilateral financial institutions recognize its carbon reduction attributes.

For the water-scarce, continuously growing population of the Middle East and North Africa region, this model also carries extended value in resource recovery — deeply treated effluent can be reused for irrigation, and nutrients produced from digestion can also be resource-recovered. Egypt, Jordan, and other countries have been intensively advancing wastewater treatment plant upgrades and reclaimed water projects in recent years: Jordan's As-Samra Wastewater Treatment Plant (treating about 70% of the nation's wastewater) has just signed an expansion agreement worth approximately 2800万 USD, with the same goal of increasing water volume available for agricultural irrigation reuse.

For China's wastewater treatment and sludge disposal industry, the Alexandria West project offers two insights: first, the value focus of sludge treatment and disposal is shifting from "volume reduction and disposal" to "energy recovery + resource circulation," with pretreatment technologies such as thermal hydrolysis being the key fulcrum driving this transformation; second, as "Belt and Road" green cooperation deepens, the full range of Chinese technologies and equipment — from seawater desalination to sludge-to-energy — has clear alternative entry space in the North African municipal water market.

About TIANYI TECH: TIANYI LIMITED has long been committed to tracking frontier developments in global water environment governance and water resource recycling, with deep engagement in technical information and industry services in the fields of wastewater treatment and reclaimed water reuse. The company is dedicated to providing timely, professional industry insights and solution references for clients and industry partners.