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An effluent before it is to be discharged has to be treated to kill its hazardous effects. If an effluent is acideic , than it has to be neutralized using some base like hydroxides to make it neutral and if its too basic then Sulphuric acid is added to make it neutral. ALso floculants and co-agulants are also used to remove the impurities and solid wastes present in the liquid.After that many pH test,conductivity tests and its concentration is examined before it is discharged. All this is carried out in ETP plant.
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What safety precautions should be taken before cleaning a heat exchanger?
Prior to cleaning a heat exchanger, one should be sure to use hand, body, and eye protection. One should not conduct acid and bleach flushing simultaneously, as this produces a noxious gas which can be lethal if inhaled for an extended period of time.
What precaution should be taken carrying experiment using pH meter?
wash the pH probe with distilled water and then dry it clean with tissue paper before and after testing the pH.
How far should eyewash stations be from chemicals?
Eyewash stations should be no more than 10 seconds walk from where chemicals are used and splashed may occur.
How many feet above the roof should a chemney be?
The top of the chimney should be at least two feet higher than a level point ten feet away from a level line to the roof.
How can i construct refractory castable?
Construction of Refractory CastableDuring the construction of refractory castable, special attention should be paid on pin welding, asphalt brushing, stirring of castable with water, making and fixing of mould, vibration and ramming of refractory castable, demoulding, sizes' and measuring points' accuracy, etc. Do construction strictly as material manufacturer and boiler works required.1. Installation of Pin and Claw NailsReinstall the pins missing for any reason and the pins in the area of heating surface composite melding junction before hydraulic pressure. Lengthen and reinstall the pins properly in coal mouth, material return mouth and upper inflection point of air duct furnace so that meets the required density of pins. Brush all the pre-buried metal parts and claw nails with asphalt paint (thickness > 1mm) or cover them with combustibles before casting.2. Dosing and Stirring of Castable & WaterThe dosing of refractory castable and water should be done strictly as the instructions of material manufacturer. The water should be clean, such as drinking water, ph 6-8. The mixer should be clean forced action mixer, and clean it for the next time using. Pay attention on the adding order of castable and water and its stirring time, adding water freely and prolonging of stirring time are forbidden. The water and refractory castable should be mixed evenly and stirred till smooth. Carry away the mixed casatble immediately after stirring, the castable poured out from stirring tank is disallowed to be poured into the tank and stirred again. Clean the tank after every construction for the next using, record the amount of water and refractory castable, and the stirring time.3. Checking Before Making TemplateCheck carefully whether the pin, hook nail and strutting part conform to the drawing, whether all the re-welding and is done and firm, whether the temporary metal parts have been cut off. Check whether the metal parts which should be brushed with asphalt paint meet the requirement, whether the casting place is clean, any other unrelated materials are forbidden to appear. For easy demoulding, a thin tier of partition (such as used oil) can be brushed in the mould. There can not be gaps between each two templates to avoid castable leaking out, so that also convenient for mould releasing. The refractory castable should be used up in 30 minutes after stirring, and should be casted to the required thickness in 1 time. Ram the castable till tight. For the too thick parts, cast tier by tier, while casting the upper tier, vibration bar can not touch the lower casted tier.
Should water be treated before drinking it?
i guess
How long should you wait before painting treated wood?
You should wait at least 6 months before painting treated wood to allow it to fully dry and cure.
How long should I wait before painting treated wood?
You should typically wait at least 6 months before painting treated wood to allow it to fully dry and cure.
How long should I wait before staining treated lumber?
You should typically wait at least 6 months before staining treated lumber to allow it to fully dry and settle.
How long should treated lumber dry before painting?
Treated lumber should dry for at least 6 months before painting to ensure proper adhesion and longevity of the paint.
How long should treated wood dry before staining?
Treated wood should dry for at least 6 months before staining to ensure proper adhesion and longevity of the stain.
How long should I wait before staining treated wood?
You should typically wait about 6 to 12 months before staining treated wood to allow it to fully dry and settle.
How long should you wait before painting pressure treated wood?
You should wait at least 6 months before painting pressure treated wood to allow it to fully dry and cure.
How long should you wait before staining pressure treated wood?
You should wait at least 6 months before staining pressure treated wood to allow it to fully dry and cure.
How long should I wait before painting pressure treated wood?
You should wait at least 6 months before painting pressure treated wood to allow it to fully dry and cure.
How long should I wait before staining pressure treated wood?
You should wait at least 6 months before staining pressure treated wood to allow it to dry and cure properly.
How long should treated wood dry before painting it?
Treated wood should dry for at least 24-48 hours before painting it to ensure proper adhesion and a long-lasting finish.
