Addition of coagulants would increase the double layer thickest of colloidal particles. Polymers are often used as the primary coagulants in water/wastewater treatment plants. pH of water would increase by stripping CO_2 from the solution One horsepower is a smaller power than one kilo-Watt. Off-line flow equalization systems will incur more pumping costs than on-line equal Most of colloids in our natural water are positively charged. Phosphorus is the main species responsible for typical \"red water\" problems in Addition of calcium ions into a water sample will raise fixed solid concentration Addition of alum to a water sample will reduce its alkalinity or pH. A positive value of Langley index implies that the water n scaling. Precipitation of heavy metals in water should he conducted under neutral or Sulfur in hydrogen sulfide (H_2S) is more reduced than that in sulfate (SO_4^-2) The absorbance of a reverse osmosis effluent should he smaller than that of The higher the conductivity, the higher the suspended solid concentration The larger the SOR of a sedimentation tank, the better its particle removal The Nernst potential is the potential of a charged particle at its shear plan Typical hydraulic detention lime of aerated grit chambers at POTWs is Ventura-type flow meters are used to measure flow rules in open- chain Water softening is to reduce carbonates from water. Solution 9. False : soda ash is a chemial used to soften or to remove the non carbonate hardness. 10. True : Coagulation is the process of destabilization by charge neutralization. Once neutralized, particles no longer repel each other and can be brought together. Coagulation is necessary for the removal of the colloidal-sized suspended matter. 11.True : polymers can be used as a primary coagulant in waste water treatment.cationic polymers are used for this process. 12.True : The use of air as the gaseous medium for stripping CO2 increased the pH to a maximum value of approximately 8.53 13.True : 1 HP = 0.7457 KW 14.True : in offline eqilization process the pumping will be done from lower level to higher level whereas in online eqilization process it is pumped through same level. 15.False : Soil colloids both organic and inorganic when suspended in water, carry a negative electric charge. When an electric current is passed through a suspension of soil colloidal particles they migrate to anode, the positive electrode indicating that they carry a negative charge. The magnitude of the charge is known as zeta potential. 16.True : phosphate is the most effective and more practical than any other measures.phosphates are mined to obtain phosphorus for use in agriculture and industry. 18. True : alum is the first coagulant of choice because of its lower cost and its widespread availability.by adding alum to water it reduces alkalinity/pH. 19.True : The Langelier Index is an approximate indicator of the degree of saturation of calcium carbonate in water. 27. False : venturi type flow m.

1. Addition of coagulants would increase the double layer thickest of colloidal particles. Polymers
are often used as the primary coagulants in water/wastewater treatment plants. pH of water
would increase by stripping CO_2 from the solution One horsepower is a smaller power than one
kilo-Watt. Off-line flow equalization systems will incur more pumping costs than on-line equal
Most of colloids in our natural water are positively charged. Phosphorus is the main species
responsible for typical "red water" problems in Addition of calcium ions into a water sample
will raise fixed solid concentration Addition of alum to a water sample will reduce its alkalinity
or pH. A positive value of Langley index implies that the water n scaling. Precipitation of heavy
metals in water should he conducted under neutral or Sulfur in hydrogen sulfide (H_2S) is more
reduced than that in sulfate (SO_4^-2) The absorbance of a reverse osmosis effluent should he
smaller than that of The higher the conductivity, the higher the suspended solid concentration
The larger the SOR of a sedimentation tank, the better its particle removal The Nernst potential
is the potential of a charged particle at its shear plan Typical hydraulic detention lime of aerated
grit chambers at POTWs is Ventura-type flow meters are used to measure flow rules in open-
chain Water softening is to reduce carbonates from water.
Solution
9. False : soda ash is a chemial used to soften or to remove the non carbonate hardness.
10. True : Coagulation is the process of destabilization by charge neutralization. Once
neutralized, particles no longer repel each other and can be brought together. Coagulation is
necessary for the removal of the colloidal-sized suspended matter.
11.True : polymers can be used as a primary coagulant in waste water treatment.cationic
polymers are used for this process.
12.True : The use of air as the gaseous medium for stripping CO2 increased the pH to a
maximum value of approximately 8.53
13.True : 1 HP = 0.7457 KW
14.True : in offline eqilization process the pumping will be done from lower level to higher level
whereas in online eqilization process it is pumped through same level.
15.False : Soil colloids both organic and inorganic when suspended in water, carry a negative
electric charge. When an electric current is passed through a suspension of soil colloidal particles
they migrate to anode, the positive electrode indicating that they carry a negative charge. The
magnitude of the charge is known as zeta potential.
16.True : phosphate is the most effective and more practical than any other measures.phosphates
are mined to obtain phosphorus for use in agriculture and industry.
18. True : alum is the first coagulant of choice because of its lower cost and its widespread

2. availability.by adding alum to water it reduces alkalinity/pH.
19.True : The Langelier Index is an approximate indicator of the degree of saturation of calcium
carbonate in water.
27. False : venturi type flow meter are use to measure flow rates of liquid which are flowing
through a pipe.
28. True : water softening is done to reduce carbanates from water.softening methods such as
lime softening,reverse osmosis ect are used for this process.