a)What would be the advantage of placing softening before cascade aeration?
(Only one answer can be correct).
Low oxygen concentration /Less pumping phases /High ammonium concentration /Less carbondioxide removal during cascade aeration
b)
What would be the disadvantage of placing softening before cascade aeration?
More energy consumption/ More use of chemicals /More pellet production/ More maintenance
c)Which (one) water quality parameter is reduced by powdered activated carbon?
Ammonium /Nitrite/ Nitrate /Chloride /Total iron /Oxygen /Carbon dioxide Temperature/ Hardness/ pH /Pesticides
a) Less pumping phases
b) More use of chemicals
hi I don't know the answers where can I found them please?/
a) The advantage of placing softening before cascade aeration is low oxygen concentration. This is due to the fact that softening involves the removal of hardness minerals, which are mainly calcium and magnesium. These minerals can act as alkalinity sources and provide bicarbonate ions, which can help maintain higher oxygen concentrations during cascade aeration. Therefore, placing softening before cascade aeration can result in a lower oxygen concentration.
To determine the correct answer, you would need to understand the process of softening and cascade aeration. Softening typically involves the use of ion exchange resins or lime treatment to remove hardness minerals from water. Cascade aeration, on the other hand, is a process where the water is aerated by passing it through a series of steps or stages, which promotes the transfer of oxygen from the air to the water. By understanding these processes, you can analyze how they would interact and determine the advantage of placing softening before cascade aeration.
b) The disadvantage of placing softening before cascade aeration is more use of chemicals. Softening usually requires the use of chemicals, such as lime or regenerant chemicals, to remove hardness minerals from water. If softening is done before cascade aeration, it would require the use of these chemicals in addition to the ones used in cascade aeration. This would increase the overall consumption of chemicals for the treatment process.
To determine the correct answer, you would need to consider the processes of softening and cascade aeration and analyze the additional chemical requirements and their impact on overall chemical consumption.
c) The water quality parameter reduced by powdered activated carbon is pesticides. Powdered activated carbon is commonly used in water treatment systems to remove organic contaminants, including pesticides. This is because powdered activated carbon has a high adsorption capacity, which allows it to attract and remove these contaminants from the water.
To determine the correct answer, you would need to consider the specific capabilities and characteristics of powdered activated carbon, as well as its applications in water treatment. By understanding how it interacts with different contaminants, you can determine the water quality parameter that is most effectively reduced by powdered activated carbon.