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Guest	mister 08/03/2009 12:11 AM
	hi sir : i would like to seek your assistance regarding our problem with wastewater step-type fine screens. The problem is the layer of rubbish/solids on screens keep on rolling back to water and only light materials like plastic are being discharged. is this a normal thing for this equipment? our fine screens have the following technica data : channel width - 2000mm inclination - 50 degree discharge height - 2217 mm total height - 2800mm water velocity - 1.05 meter per second step motion speed - 1.5 meter per minute maximum upstream water level - 1.810 meters maximum downstream water level - 1.7400 meters hoping for your kind analysis and recommendations. thanks. ricardo cinco technical staff, riyadh STP riyadh, ksa
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing. Kettle's on. Posts: 8647 Good Answers: 163	#1 Re: mister 08/03/2009 4:07 AM
	What does the original equipment manufacturer have to say on the subject? If the manufacturer has been offered this problem to solve before, then the solution could be just a phone call away. Make the call! __________________ The elephant is a funny bird. It flits from bough to bough. It lays its eggs in a rhubarb tree and whistles, like a cow - Spike Milligan.

DVader1000 Guru Join Date: May 2007 Location: Anywhere Emperor Palpatine assigns me Posts: 2200 Good Answers: 85	#2 Re: mister 08/03/2009 6:26 AM
	You didn't state what the specific gravity of the solids are. The light material will float, while the heavier material will sink. If the specific gravity is close to 1, then the solids will be suspended within the water. When you say roll back to water, do you mean that the solids remain suspended instead of being trapped by the screen? Also, the water velocity is quite high. Who designed this, the supplier? If so, what information were they provided with when they did the design work? __________________ If only you knew the power of the Dark Side of the Force

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