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Upgrade of digester tanks

A process of decomposition and stabilization of sludge under anaerobic conditions takes place in these tanks with the use of anaerobic microbes that develop in them. The anaerobic biological process in the tanks is comprised of two stages. In the first stage, the organic material decomposes into organic acids, while at the second stage the organic acids break down into gases – methane and carbon dioxide.  All of the digester tanks at the plant are single-stage with mixers and heaters and are highly efficient. Numerous upgrades have been made over the years to the digester tanks.

In 2009, the development works for Digester Tank No. 5 were completed, in the framework of which the gas mixing system was replaced with an innovative pump-based mixing system. This pump discharges the sludge at a flow rate of 1000 m3/h through six spray nozzles at the bottom of the tank, which brings about more efficient mixing of the sludge in the tank. The pump can also grind rags in the sludge.

In 2012, an upgrade of Fermentation Tank No. 3 was performed, in the framework of which a new concrete roof was constructed, a new mixing system and new foam breaker system were installed and all of the piping in the tank was replaced. The upgraded digester will be operating by the end of the year.

Thorough emptying and cleaning of Digester Tank No. 7 was performed in 2014, constituting the first time it had been shut down since its initial operation in 2000. Piping works were executed in the tank and pneumatically-operated knife valves were installed enabling fast and efficient operation of the various systems. The roof of the tank was rehabilitated and sealed and a new pressure regulator system was installed in the tank supporting its safe operation.

Project Details
  • Start Date
  • End Date
  • Cost of the project
  • Work Time
  • ₪3,500,000
Projects in progress

Computerized archive

The Association has begun a project to set...

Computerization of engineering drawings

Engineering drawings and paper drawings from the 1950s...

New rag grinder

A rag grinder was installed in 2015 replacing...

New generator

A biological sludge treatment process takes place at...

Installation of sleeves

Extensive maintenance works are being performed in the...

Building renovations

The treatment plant is preparing to renovate and...

Power plant motor coolant piping

The Haifa Wastewater Treatment Plant, operated by the...

Basement ventilation system

Five new aeration fans have been installed for...

Upgrade of the drying and thickening installation

Upgrade of the drying and thickening installation The drying...

Refurbishment of the electricity producing generator

Refurbishment of the electricity producing generator The power station...

Installation of thickening machine

Installation of thickening machine In order to adapt the...

Upgrade of digester tanks

A process of decomposition and stabilization of sludge...

Upgrade of computerized systems

The management system has been upgraded, including Priority...

Replacement of pilot piping in the gas...

The pilot piping in the gas flare has...

Additional projects

New rag grinder

A rag grinder was installed in 2015 replacing...

Computerized archive

The Association has begun a project to set...

Refurbishment of the main pumping station

The main pumping station is in final stages...

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