JetMix Applications: Biosolids Storage

Biosolids Storage

HOW IT STARTED

Long term storage of biosolids was mandated by a number of northern states. Sludge for land disposal to be stored for a period up to six months to proven spreading on frozen ground. The volume involved with these tanks led to large diameter tanks which proved to be difficult to mix. Mechanical and gas mixing were inadequate for the task. The first JetMix system was installed at this tank in Denmark, WI. The initial trial showed that sludge averaging 9% solids could be resuspended and homogenized after not being mixed for 9 months. When the tank was drained, the floor had no measurable sludge left , even though the floor was flat. More than 15 years late, this system is still performing and getting the job done. Note the outload station on the right which uses the JetMix pumps for filling trucks.

POWERFUL JETS, PROPERLY LOCATED

The key to the successful performance of the JetMix system is the strategic location of the powerful jets to create the unique pattern. This rotatable nozzle in a Minnesota tank is being tested. The plume is formed without radial spray would otherwise detract from the impact on the liquid. Internal straightening vanes prevent a radial pattern which can develop from flow through piping fittings.The control for the rotatable nozzle is located outside of the tank, entering through the tank wall and connecting to the nozzle gear box by a crank rod in a casing. The operator can adjust the nozzle position if desired. An indicator shows the direction of the nozzle.

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USERS PREFER JETMIX

The experience that many cities have with the JetMix system has been shown in by their use of this system in additional plants. This is one of three plants in a Northern Illinois city where the sludge storage tanks are equipped with JetMix. The city has also chosen to use the system in their anaerobic digesters.The combination of economical installation and low operating costs makes this an attractive option. The JetMix concept was awarded the Innovative Technology Award by the Water Environment Federation in 1997 for work at the Springfield (IL) Metropolitan Sanitary District. The uniform product made land disposal management much easier and the cost savings compared to other systems meant a very good return on the district’s investment.

COLD WEATHER OPERATION

Weather conditions do not affect the JetMix system. Where freezing conditions are expected, the pumps should be indoors or mounted in weatherproof enclosures. The piping and nozzles in the tank do not require maintenance under any weather condition. Thus maintenance is limited to the pumps which are not exposed to the elements.

These tanks located in Ontario, Canada, are used for long term storage. Ice formation on the surface does not affect the mixing equipment on the floor. The pipes are buried underground to prevent freezing.

Since the JetMix system can resuspend solids after a long shut down period, operator attention is not necessary during inclement weather periods.

INDUSTRIAL USERS LIKE JETMIX

Industrial applications often call for mixing of large quantities of liquids and solids. These tanks hold a blowdown of diatomaceous earth, biological solids and a variety of additives that must be maintained in a uniform mixture prior to further processing. The volume in each tank is about 500,000 gallons and the solids concentration varies less than 1% across the width and depth of the tank.

The solids settle rapidly and can create a nuisance. Expecting that some solids had settled, the plant shut down one tank after several years of continuous operation and found a negligible amount of solids were left in the tank, not even worth cleaning out. The abrasive nature of the solids has not affected the nozzles which have lasted over ten years before replacement.

JETMIX HELPS OTHER EQUIPMENT

Equipment such as aeration headers often fail to keep solids in suspension. JetMix nozzles are mounted in this tank to keep solids off the floor. One nozzle can just be seen under the right header. The effect of combining the two systems actually saves on energy costs. In this Missouri aerobic digester, the mixing system reduces the amount of air required to the level required only for biological activity. The mixing system , run on a cyclical basis, uses much less energy to keep solids in suspension. Thus, the total power requirement is reduced by 40% or more. Further, solids do not accumulate under the aeration headers which eliminates tank cleanout.

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Liquid Dynamics Corp.
2011 Dean Street St. Charles, IL 60174
phone: 630-513-8366 fax: 630-513-6447

HOW IT STARTED Long term storage of biosolids was mandated by a number of northern states. Sludge for land disposal to be stored for a period up to six months to proven spreading on frozen ground. The volume involved with these tanks led to large diameter tanks which proved to be difficult to mix. Mechanical and gas mixing were inadequate for the task. The first JetMix system was installed at this tank in Denmark, WI. The initial trial showed that sludge averaging 9% solids could be resuspended and homogenized after not being mixed for 9 months. When the tank was drained, the floor had no measurable sludge left , even though the floor was flat. More than 15 years late, this system is still performing and getting the job done. Note the outload station on the right which uses the JetMix pumps for filling trucks.
POWERFUL JETS, PROPERLY LOCATED The key to the successful performance of the JetMix system is the strategic location of the powerful jets to create the unique pattern. This rotatable nozzle in a Minnesota tank is being tested. The plume is formed without radial spray would otherwise detract from the impact on the liquid. Internal straightening vanes prevent a radial pattern which can develop from flow through piping fittings.The control for the rotatable nozzle is located outside of the tank, entering through the tank wall and connecting to the nozzle gear box by a crank rod in a casing. The operator can adjust the nozzle position if desired. An indicator shows the direction of the nozzle.	I
USERS PREFER JETMIX The experience that many cities have with the JetMix system has been shown in by their use of this system in additional plants. This is one of three plants in a Northern Illinois city where the sludge storage tanks are equipped with JetMix. The city has also chosen to use the system in their anaerobic digesters.The combination of economical installation and low operating costs makes this an attractive option. The JetMix concept was awarded the Innovative Technology Award by the Water Environment Federation in 1997 for work at the Springfield (IL) Metropolitan Sanitary District. The uniform product made land disposal management much easier and the cost savings compared to other systems meant a very good return on the district’s investment.
COLD WEATHER OPERATION Weather conditions do not affect the JetMix system. Where freezing conditions are expected, the pumps should be indoors or mounted in weatherproof enclosures. The piping and nozzles in the tank do not require maintenance under any weather condition. Thus maintenance is limited to the pumps which are not exposed to the elements. These tanks located in Ontario, Canada, are used for long term storage. Ice formation on the surface does not affect the mixing equipment on the floor. The pipes are buried underground to prevent freezing. Since the JetMix system can resuspend solids after a long shut down period, operator attention is not necessary during inclement weather periods.
INDUSTRIAL USERS LIKE JETMIX Industrial applications often call for mixing of large quantities of liquids and solids. These tanks hold a blowdown of diatomaceous earth, biological solids and a variety of additives that must be maintained in a uniform mixture prior to further processing. The volume in each tank is about 500,000 gallons and the solids concentration varies less than 1% across the width and depth of the tank. The solids settle rapidly and can create a nuisance. Expecting that some solids had settled, the plant shut down one tank after several years of continuous operation and found a negligible amount of solids were left in the tank, not even worth cleaning out. The abrasive nature of the solids has not affected the nozzles which have lasted over ten years before replacement. JETMIX HELPS OTHER EQUIPMENT Equipment such as aeration headers often fail to keep solids in suspension. JetMix nozzles are mounted in this tank to keep solids off the floor. One nozzle can just be seen under the right header. The effect of combining the two systems actually saves on energy costs. In this Missouri aerobic digester, the mixing system reduces the amount of air required to the level required only for biological activity. The mixing system , run on a cyclical basis, uses much less energy to keep solids in suspension. Thus, the total power requirement is reduced by 40% or more. Further, solids do not accumulate under the aeration headers which eliminates tank cleanout.