10+ Nerofix Interview Questions and Answers

PPM of dosing can be calculated by dividing the weight of the chemical added by the weight of the solution and multiplying by 1,000,000.

• Determine the weight of the chemical added

• Determine the weight of the solution

• Divide the weight of the chemical by the weight of the solution

• Multiply the result by 1,000,000 to get the PPM

• PPM = (Weight of Chemical / Weight of Solution) x 1,000,000

SDI formula is used to measure the amount of silt or suspended solids in water.

• SDI = (log(R1/R2) x 1000)/n

• R1 is the initial flow rate of water through a filter

• R2 is the flow rate after a certain period of time

• n is the number of filters used in the test

Criteria of membranes refer to the characteristics that determine their effectiveness in separating substances.

• Pore size

• Selectivity

• Permeability

• Chemical compatibility

• Mechanical strength

Parameters to check in ETP include pH level, temperature, turbidity, dissolved oxygen, and chemical dosing.

• pH level

• Temperature

• Turbidity

• Dissolved oxygen

• Chemical dosing

COD is Chemical Oxygen Demand, BOD is Biochemical Oxygen Demand, FM ratio is Food to Microorganism ratio.

• COD is a measure of the amount of oxygen required to chemically oxidize organic matter in water.

• BOD is a measure of the amount of oxygen required by microorganisms to break down organic matter in water.

• FM ratio is the ratio of food (organic matter) to microorganisms in a biological treatment system.

• Example: A high COD level in water indicates high organic pollution, while ...read more

Achieving final water parameters involves proper testing, treatment, and monitoring.

• Perform regular water testing to monitor parameters such as pH, chlorine levels, and turbidity

• Adjust treatment methods based on test results to maintain optimal water quality

• Implement proper filtration systems to remove impurities and contaminants

• Regularly monitor and maintain equipment to ensure efficient operation

• Train staff on proper water treatment procedures and protocols

Aerobic and anaerobic digesters are systems used to break down organic matter. FM ratio is the ratio of food waste to microorganisms in the digester.

• Aerobic digester uses oxygen to break down organic matter, while anaerobic digester operates without oxygen.

• Aerobic digesters are faster but require more energy, while anaerobic digesters are slower but more energy efficient.

• FM ratio (Food to Microorganism ratio) is the ratio of food waste to microorganisms in the digester, indic...read more

Designing an ETP involves determining the required treatment processes, sizing the equipment, and ensuring compliance with regulations.

• Identify the type and volume of wastewater to be treated

• Select appropriate treatment processes such as physical, chemical, and biological

• Size the equipment based on the flow rate and characteristics of the wastewater

• Consider factors like space availability, budget, and regulatory requirements

• Ensure proper maintenance and monitoring procedures ...read more

ETP stands for Effluent Treatment Plant, which is used to treat wastewater before it is discharged into the environment.

• ETP removes contaminants from wastewater through physical, chemical, and biological processes.

• It helps in reducing the pollution load in water bodies by treating industrial effluents.

• Common processes in ETP include screening, sedimentation, biological treatment, and disinfection.

• ETP plays a crucial role in maintaining environmental sustainability and complia...read more