Al-Ewan Medical Company Interview Questions and Answers

R.O stands for Reverse Osmosis, a water purification process that uses a partially permeable membrane to remove ions, molecules, and larger particles from drinking water.

• Reverse Osmosis is a water treatment process that uses pressure to force water molecules through a semipermeable membrane.

• It removes impurities such as salts, minerals, and other contaminants from water.

• R.O systems are commonly used in households, indu...read more

P.P.M stands for Parts Per Million, a unit of measurement used to express very low concentrations of substances in water or air.

• P.P.M is used to measure the concentration of a substance in a solution or mixture.

• It represents the ratio of the mass of the solute to the total mass of the solution, multiplied by one million.

• For example, if a solution contains 1 part of solute for every 1 million parts of solution, it is ex

Chemicals used in R.O. plants vary depending on the specific system and water quality, but common ones include antiscalants, disinfectants, and pH adjusters.

• Antiscalants are used to prevent scaling and fouling of the membranes.

• Disinfectants like chlorine are used to kill bacteria and other harmful microorganisms.

• pH adjusters like sulfuric acid or caustic soda are used to maintain the optimal pH level for the membranes

Sand filter is used to remove suspended solids from water by trapping them in the sand bed.

• Sand filter works by passing water through a bed of sand to trap suspended solids.

• It is commonly used in water treatment plants to remove particles like dirt, debris, and algae.

• Regular maintenance is required to clean and backwash the sand filter to ensure proper filtration.

• Sand filters are effective in removing particles down to