Gorlan Interview Questions and Answers

The chemical used mostly in ETP plants is coagulant.

• Coagulant is used to destabilize and aggregate suspended particles in wastewater.

• Common coagulants used in ETP plants include aluminum sulfate, ferric chloride, and polyaluminum chloride.

• Coagulants help in the removal of pollutants like suspended solids, organic matter, and heavy metals.

• The choice of coagulant depends on the specific wastewater characteristics and treatment goals.

The hardness of treated water refers to the concentration of minerals, while pH measures the acidity or alkalinity of the water.

• Hardness of water is determined by the presence of minerals such as calcium and magnesium.

• It is measured in terms of milligrams per liter (mg/L) or parts per million (ppm).

• Water with high hardness may cause scaling in pipes and appliances.

• pH is a measure of the concentration of hydrogen ions in the water.

• It ranges from 0 to 14, with 7 being neutral, ...read more

The TDA value of inlet and outlet depends on the specific ETP system and its design.

• TDA stands for Total Dissolved Solids and is a measure of the amount of dissolved solids in water.

• The TDA value of inlet water is typically higher than that of outlet water in an ETP system.

• The TDA value can be affected by factors such as the type of wastewater being treated, the treatment process used, and the efficiency of the system.

• The TDA value is important to monitor as high levels can i...read more

Conductivity is the measure of a material's ability to conduct electric current.

• Conductivity is a physical property of a substance.

• It is determined by the presence of charged particles, such as ions or electrons, that can carry electric current.

• Conductivity is typically measured in siemens per meter (S/m) or mhos per meter (mho/m).

• Metals are good conductors of electricity due to the presence of free electrons.

• Water and other electrolytes also have high conductivity due to the...read more

TDS stands for Tax Deducted at Source.

• TDS is a system introduced by the Indian government to collect taxes at the source of income.

• It is a method of deducting tax from payments made by individuals or companies.

• The person or entity making the payment is responsible for deducting the tax and depositing it with the government.

• TDS is applicable to various types of income such as salaries, interest, rent, professional fees, etc.

• The deducted tax amount is then credited to the accou...read more

The full form of pH is 'potential of hydrogen'.

• pH is a measure of the acidity or alkalinity of a solution.

• It indicates the concentration of hydrogen ions in a solution.

• The pH scale ranges from 0 to 14, with 7 being neutral.

• A pH value below 7 indicates acidity, while above 7 indicates alkalinity.

• For example, lemon juice has a pH of around 2, making it acidic.

• Baking soda has a pH of around 9, making it alkaline.