Question
Which of the following is used as a coagulant for removal of phosphates in water ?
The correct answer is
Aluminium sulphate
The question pertains to the selection of a coagulant for the removal of phosphates from water. In water treatment processes, coagulants are used to remove impurities, including phosphates, by promoting the agglomeration of particles into larger clusters that can be more easily filtered or settled out.
Explanation of Options:
- Aluminium sulphate: This is a commonly used coagulant in water treatment. It reacts with phosphates to form an insoluble aluminium phosphate compound, which can then be removed by filtration or sedimentation.
- Iron sulphate: Iron compounds can also be used as coagulants; however, aluminium sulphate is preferred for phosphate removal.
- Copper sulphate: Copper sulphate is not typically used as a coagulant in water treatment. It is more commonly used as an algaecide.
- Potassium chromate: This compound is not used as a coagulant. It is, in fact, harmful and not suitable for water treatment.
Conclusion: The most effective and widely utilized coagulant among the given options for the removal of phosphates in water is Aluminium sulphate.
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Important Questions from Water Treatment
- Choose the correct statements about coagulation process.
A. Coagulation makes smaller colloids to adhere to each other to form large floc particles
B. Colloids are continually involved in Brownian moment.
C. Colloids are stable because of their surface charge.
D. Coagulants are preferably trivalent cations.
E. Coagulants are soluble in neutral pH.
Choose the most appropriate answer from the options given below: - Hardness of water is due to the presence of
- Given the following parameters of a primary settling chamber :
Diameter = 50m, Depth = 2.5m, average detention time = 2 hours.
How much quantity of waste water is being treated ? - Calculate hardness in units of mg/l as CaCO$_3$ of a ground water sample having Ca$^{++}$ ion concentration of 100 mg/l.
- Choose the correct statements
A. Temperature has a effect in disinfection treatment of water.
B. pH controls the amount of HOCl and OCl in water.
C. Cl$_2$ gas used for disinfection forms HCl as a product in water.
D. Disinfection action is because of HOCl formed and not due to Cl$_2$ gas.
E. Combined chlorine exist in water due to combination of HOCl with NH$_3$ and organic compounds.
Choose the correct answer from the options given below:
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