Water Supply and Wastewater Engineering MCQs (Part-8)
What is the main function of a septic system?
A Pump wastewater
B Filter water
C Store water
D Treat wastewater
A septic system is designed to treat wastewater on-site, typically in rural areas. It separates solids from liquids in a tank, where the liquids are filtered through the soil for safe disposal.
What is the key benefit of anaerobic digestion in wastewater treatment?
A Remove nutrients
B Produce biogas
C Kill bacteria
D Remove solids
Anaerobic digestion is a biological process that breaks down organic waste in the absence of oxygen, producing biogas as a byproduct. This process helps reduce sludge volume and generates renewable energy.
What does greywater recycling typically involve?
A Reusing sink and shower water
B Pumping stormwater
C Treating toilet water
D Filtering rainwater
Greywater recycling involves treating and reusing water from household sinks, showers, and laundry for non-potable purposes such as irrigation or toilet flushing, which helps conserve freshwater.
What is nutrient removal used for in wastewater treatment?
A Remove organic matter
B Remove suspended solids
C Reduce nitrogen and phosphorus
D Kill microorganisms
Nutrient removal in wastewater treatment focuses on removing nitrogen and phosphorus, which are key contributors to eutrophication in water bodies, thereby protecting aquatic ecosystems and improving water quality.
Which wastewater treatment process uses microorganisms to break down organic material?
A Reverse osmosis
B Anaerobic digestion
C Filtration
D Coagulation
Anaerobic digestion uses microorganisms to decompose organic matter in the absence of oxygen. This process is essential for managing sludge and producing biogas, which can be used as a renewable energy source.
What is greywater typically used for?
A Industrial cooling
B Drinking water
C Wastewater treatment
D Irrigation
Greywater is typically used for irrigation after being properly treated. It comes from household activities like washing dishes and bathing, and its reuse helps reduce the demand for fresh water in non-potable applications.
Which system treats wastewater without using oxygen?
A Anaerobic digestion
B Filtration
C Reverse osmosis
D Aerobic digestion
Anaerobic digestion occurs without oxygen and uses microorganisms to break down organic matter in wastewater. This process produces biogas and reduces the volume of sludge, making it a sustainable treatment method.
What is the primary purpose of nutrient removal in wastewater treatment?
A Remove harmful bacteria
B Increase water clarity
C Prevent eutrophication
D Remove large particles
Nutrient removal focuses on removing nitrogen and phosphorus, which can contribute to eutrophication in water bodies. Eutrophication leads to excessive algae growth, which harms aquatic life and degrades water quality.
What does a septic tank primarily do?
A Pump water
B Treat wastewater
C Store water
D Filter water
A septic tank treats wastewater on-site by separating solids from liquids. The solids settle at the bottom, and the liquids are filtered through soil or other treatment systems, reducing the environmental impact of wastewater.
Which of the following is an anaerobic process?
A Chlorination
B Aeration
C Coagulation
D Anaerobic digestion
Anaerobic digestion is a biological process in which organic materials are broken down by microorganisms in the absence of oxygen. It is used to treat sludge and wastewater and produce renewable biogas as a byproduct.
What type of water does greywater recycling involve?
A Wastewater from kitchens
B Toilet water
C Potable water
D Stormwater
Greywater recycling involves the reuse of wastewater from non-toilet sources like sinks, showers, and laundry. This water is treated and reused for non-potable purposes like irrigation, helping conserve freshwater resources.
What is one of the main benefits of anaerobic digestion in treating wastewater?
A Softens water
B Reduces water usage
C Produces energy
D Removes nitrogen
Anaerobic digestion helps generate biogas, which can be used as a renewable energy source. This process reduces the volume of sludge and provides an environmentally friendly way to generate power while treating wastewater.
Which treatment process helps prevent contamination from excessive nutrients?
A Chlorination
B Nutrient removal
C Coagulation
D Sedimentation
Nutrient removal focuses on removing nitrogen and phosphorus from wastewater, preventing the nutrients from causing eutrophication in rivers, lakes, and oceans. This improves water quality and protects aquatic ecosystems.
What is typically used in wastewater treatment to break down organic matter?
A Anaerobic digestion
B Reverse osmosis
C Chlorination
D Filtration
Anaerobic digestion is the process that uses microorganisms to break down organic material in wastewater without the use of oxygen. This process reduces sludge volume and produces biogas, which can be used for energy.
How is greywater typically treated before reuse?
A Sedimentation
B Coagulation
C Filtration
D Chlorination
Greywater is typically treated through filtration to remove suspended solids, followed by disinfection methods such as UV treatment or chlorination, ensuring it is safe for non-potable uses like irrigation or toilet flushing.