8/13/2019 26904

1/2

ert ical fi l ter press helps reducewaste by two thirdsEVANSGeneralForemanGas lectricWATSONssociate

roblem: Pacific Gas Electric (PG&E) operates 19eothermal units at the geysers in Northern California. Thesulfide abatement chemicals to condensedof fine elementalin the cooling tower basins. Smaller amounts ofin sedimentationponds and in-line clarifiers.Up to 570 tons of sludge, containing 1 to 20 solids bying a typical overhaul. Sometimes mer-

ly hazardous.To reduce plant operating costs and incre se efficiency,chose to build their own solids-removal facility utilizingfiltration equipment. Filtration technologyy examining past operating experiences and having

tests. Filter selection w sof a very ry sulfurcake to reduce waste-costs, the capability of processing 1.2 million gal of sludgeyear and maximized automation to reduce operator labor.PG E chose a vertical chamber filter featuring stacked plates

169.5 sq ft of filtration area and a pro-le logic controller PLC)hat automatically directs thef operation over each filtration cycle. Operators canoptimum performance.Each filter cycle is initiated by energizing the closing mecha-forming se led chambers where the sludge is pumped via ance the desired cake thick-% to % is achieved, recessed rubber diaphrasms in each

re inflated with water to pressuresofup to 235 psig, pro-Next, air at 110 psig is blown through voids in the cake to

o a bin. As the cloth belt advances, it isd scraped clean. Cycle times typ-9 to 15 min.An air-cooled, 215 SCFM rotary screw compressor provides

per cycle. Ample (1 600-gal) receiver volume is provided toe the compressor duty cycle.

Larox PF FilterDperation Principle

Step 1. Filtration

Step 2. Squeeze

Step 3. Washing optional)

Step 4. Squeeze optional)

Step 5 Air Blow

Step 6. Cake Discharge

8/13/2019 26904

2/2

a water

The facility has met or exceeded design cake dryness andten

runs for eight hours a day, five days a week (sludge processingsix hours per day). Approximately two 20-cu-yd binsfiled per day.

this vertical chamber filter press helps meet or exceed PG Es cake drynessproduction ratesare s m h g up and shut-tanks, maneuvering

and flushing pipelines. The filter press and much of the auxil-PG&E an estimated

of the vertical chamber filter press hased sulfur cake dryness from 50-58 to 68-72% solids byfficient liquid removal results in a much harder, drierbe packed into fewer bins. Consequently, the volume of

i

The Sahara Hot Room / Model SHR-16Heats sixteen 55 gallon drums Available in steamor electric Built in spill containment holds 2 full drumsRugged construction for indoor and outdoor applications3 inch thick mineral wool insulatio n Can be easilycustomized Shipped completely assembled

BENKORODUCTS INC.24500Center Ridge Road Westlake, Ohio 44145(216) 835-8070 FAX: (216) 835-8693

~~ ~

filter press-Larox, Inc., Columbia, MD. Circle 406Corp., Michigan City, IN Circle 407

Circle 111