ESD™ Egg-Shaped Digesters

CB&I began offering ESD™ Egg-Shaped Digester systems in 1989, and we’ve made a number of advancements over the years. We introduced the use of steel instead of concrete for faster and more economical digester construction. We also designed an innovative jet pump mixing system and an internal discharge system to improve reliability and reduce maintenance costs.

Our specialty is providing complete design-build services on a lump sum, turnkey basis for both new digester construction and revamps. As a true EPC company, we are a single-source provider of process technology, systems design, fabrication, installation and startup services for water customers all over the world. Our experience and project expertise result in reduced costs, better quality control and shortened project schedules for our customers. 

Making a Good Thing Better

We’ve designed and installed more than 70 ESD systems. We design digesters that utilize either a conventional mechanical draft tube mixing system or our proprietary jet pump draft tube mixing system. The jet pump system requires less energy for mixing and provides draft tube mixing without internal moving parts. We’ve also developed an internal liquid discharge system that utilizes gas-tight, positive-pressure containment. These innovations add up to lower operating and maintenance costs, increased reliability and minimized odor emissions for our customers. 

In addition, we offer foam-in-place insulation to improve temperature control and prevent moisture penetration. Using our own proprietary equipment, we apply closed-cell polyurethane foam to the digester’s outer shell at the project site.

Efficient Treatment Systems

The Egg-Shaped Digester is one of the most efficient and cost-effective anaerobic systems for sludge treatment. Its double-curvature shape, small top liquid surface area and liquid mixing system help reduce scum, grit buildup and dead zones. Thus, the vessel does not have to be taken out of service for cleaning. The ESD system also provides a smaller footprint, improved reliability, enhanced process control and reduced maintenance, all leading to reduced energy demand. 

With more than a century of experience serving the water industry, we have the expertise to design and build ESD systems that meet specific customer requirements. We’ve delivered digesters that accommodate a variety of capacity needs, geographic and climatic situations, space limitations and aesthetic concerns. And our true EPC approach means our customers receive the results they expect, on time and on budget.

Contact our experts

Contact Our Experts

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