Question

When alum is added to the waste water containing calcium ions which compound is formed as a precipitate?

a.

Al(OH)₃

b.

Al₂(SO₄)₃

c.

Ca(OH)₂

d.

CaCO₃

Answer: (a).Al(OH)₃

Interact with the Community - Share Your Thoughts

Uncertain About the Answer? Seek Clarification Here.

Understand the Explanation? Include it Here.

Q. When alum is added to the waste water containing calcium ions which compound is formed as a precipitate?

Similar Questions

Explore Relevant Multiple Choice Questions (MCQs)

Q. Along with ferrous sulphate what other chemical is added in order to bring about precipitation?

Q. Why is Ferric ammonium sulfate generally not used as a coagulant?

Q. What is the recommended surface loading rate in case of alum floc suspension?

Q. In percentage what is the amount of TSS removed by chemical clarification?

Q. In percentage what is the amount of BOD removed by chemical clarification?

Q. In percentage, how much does the chemical sludge contribute to the total sludge formed?

Q. Assume in a sample of waste water around 60% TSS is removed by primary sedimentation without chemical addition. Calculate the mass of TSS removed for the following data.

Amount of TSS present initially: 220 mg/L
Waste water flow: 1000 m³/d

Q. Determine the sludge formed from the following set of data.

Specific gravity of sludge: 1.05
Moisture content: 92.5%
Total dry solids: 213.4 kg/1000 m³

Q. At what pH is phosphate precipitated out?

Q. Name the compound formed when lime is added in order to precipitate phosphate.

Q. At which point, chemical addition for phosphorous removal can’t be carried out?

Q. Calculate the dosage rate for the following data.

Flow rate: 2200m³/hr
Dosage: 100 ppm

Q. Calculate the volume of lime to be dosed for the below given data. Round it off to the nearest digit.

Flow rate: 2200m³/hr
Dosage: 25 ppm
Specific gravity: 1.12
Concentration: 10%

Q. Calculate the size of the tank for the below given data. Round off to the nearest 1000 digit.

Flow rate: 440lph
Retention time: 17 hrs

Q. What is the detention time assumed while designing a flash mixer?

Q. Determine the size of a flash mixer for the following data. Round off to the nearest digit.
Flow rate: 2200 m³/hr

Q. A process of contact and adhesion whereby the particles of a dispersion form larger-size clusters is called ________

Q. What is the other name for deflocculation?

Q. How many types of solids are present in water?

Q. What is the movement of solids in water called?

Recommended Subjects

Are you eager to expand your knowledge beyond Waste Water Engineering? We've handpicked a range of related categories that you might find intriguing.

Click on the categories below to discover a wealth of MCQs and enrich your understanding of various subjects. Happy exploring!