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Here's our tentative setup for 250gpm pond waste: http://www.liftup.no (air lift pond waste handling) http://www.geotubes.com (geotextile filter bladders) http://www.aquamizer.com (seepage treatment to TMDL's) Any seepage is at a lower rate than the pumping influent. Budget of $50,000 should...

Air is compressible. Manifolding air to differing vacuum pressures dynamically will require automated controls. The cost of the automatic controls and SCADA to monitor them is more than the cost of seven individual vacuum pumps, but if you're having the control problems with the process anyway...

The eductor drive-water hose is an idea, but if you look at the hydraulics of eductors, shear is their middle name. Our dewatering plan keeps the solids as undisturbed as possible. We are studying a cheaper solution to a filter press, see at Geotubes.com, basically geotextile dewatering...

Thanks for all the ideas. The (multiple) ponds are in clusters around the site, and very low tech operation. One person moves from pond to pond with a cleaning wand plugged into a gallery of suction piping to the eductor. Currently we gravity flow to sediment settling ponds, but because of the...

We are cleaning aquaculture pond waste using a high-pressure eductor pump and a venturi. This creates a nice suction to pull the sediment up from the ponds, which are 5' deep, 100' long and 20' wide. The shear, unfortunately, takes an easily-settleable sediment and turns it into a chocolate...

Art, thanks for the generic information, it's good advice. To answer your first question, the pump is a diaphram pump. 1. In this case, the needle valve shunt to drum source is in series with the needle valve shunt to pump suction. This allowed a measured %-age of recirculation bypassing the...

Because the drum suction runs through a 40-mesh pre-screen, a shunt return to suction is just a way to avoid continous screening of the drum material, albeit only 1 gal/minute. That is, once the formalin has been screened, might as well return the differential between 1 gal/minute pump supply...

Just wanted a reality check on a low-cost low-volume low-pressure formalin pump system we cobbled together using an ITT Flojet 1gpm @ 25psi chemical pump, with bypass shunts feeding back to the pump suction and to the formalin drum. My thoughts were to start the pump with the drum shunt open...