7. Which of the following is a disadvantage with respect to the size of the sewers? Explanation: As the combined systems consist of a single large sewer to carry both sanitary sewage and storm water, it is easy to clean and choking problems are avoided.

What is sewer disadvantages?

Disadvantages of a Combined Sewer System

1) The load on the treatment plant becomes high. 2) The stormwater is unnecessarily polluted. 3) The sewers are large in diameter. 4) This system proves to be uneconomical when pumping is required for the lifting of sewage.

What's a major disadvantage of combined sewers?

These overflows, called combined sewer overflows (CSOs), contain not only storm water but also untreated human and industrial waste, toxic materials, and debris. They are a major water pollution concern for the approximately 772 cities in the U.S. that have combined sewer systems.

Which of the following is an advantage of separate sewers?

Which of the following is an advantage of separate sewers? Clarification: In separate sewer systems, as two sets of sewers are used, the quantity of wastewater flow will also be less in sewers. Hence the size of the sewers will be small.

Which of the following is a disadvantage of asbestos cement sewer?

Explanation: The disadvantage of Asbestos cement pipe is that it is soft and brittle, so they are weak under impact loading due to moving traffic. 15.

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What are the disadvantages of asbestos?

Breathing in asbestos fibres can cause asbestosis, lung cancer and mesothelioma. The risk of contracting these diseases increases with the number of fibres inhaled and the risk of lung cancer from inhaling asbestos fibres is also greater if you smoke.

What is the disadvantage of asbestos pipe?

The major disadvantage of using asbestos is that it is seriously hazardous to health. Asbestos comprises of invisible micro particles which when released in the air can cause life threatening diseases if inhaled for a continuous span of time.

Which of the following is a disadvantage of a separate water carriage system?

5. Which of the following is a disadvantage of a separate water carriage system? Explanation: In a separate water carriage system, because of lesser air contact with small sized sewer, foul smell is formed due to the formation of sewage gas.

What are the advantages of separated water systems compared to mixed sewage systems?

The separate collection prevent the overflow of sewer systems and treatment stations during rainy periods and the mixing of the relatively little polluted surface run-off with chemical and microbial pollutants from the municipal wastewater.

On which of the factors mentioned below the type of the sewer installed does not depend on *?

On which of the factors mentioned below, the type of the sewer installed does not depend on? Clarification: Storm water does not act as a distinctive factor for the installation of sewer systems. The type of sewer installed depends upon the terrain, where it is placed and the uses.

Why are combined sewer systems Bad?

Discharge from combined sewer overflows can also back up into basements, causing property damage and creating health problems for anyone exposed to untreated sewage and wastewater. CSO discharge can carry bacteria, intestinal worms, protozoa and viruses.

Why do sewers overflow?

Sewer back-ups and overflows are frequently caused by improper materials such as fats, oils and grease (FOG) being placed into the sewer system. Since fats, oils and grease are lighter than water; they tend to accumulate at the top and sides of sewer pipes and can build up until a blockage occurs.

What are two main types of sewers and how do they differ?

Sanitary sewers (also known as foul or covered sewers) often run to treatment plants and directly transport household and industrial wastewater. Meanwhile, street storm drains and roof drains are directed to a separate sewer line, which leads to a nearby water body.

What are disadvantages of sewage treatment plant?

A sudden increase in water or waste from your home. The use of harsh chemicals in the home. Ambient temperature changes.

What are the advantages of sewage?

The sewerage system provides a healthier and more appropriate way to manage liquid wastes. Previously, all sewage waste was discharged in septic tanks and cesspits, resulting in the pollution of the ground water of the areas where such waste was discharged.

What are the advantages and disadvantages of cast iron pipes?

Cast iron is extremely strong, durable and heavy. Cast iron also reduces sound and is heat-resistant. Despite the advantages of strength and durability, though, a big disadvantage of cast iron is that it is susceptible to rust over time.

What is a sanitary sewer overflow and what risks are associated with it?

Occasionally, sanitary sewers will release raw sewage. These types of releases are called sanitary sewer overflows (SSOs). SSOs can contaminate our waters, causing serious water quality problems, and back-up into homes, causing property damage and threatening public health.

What are separate sewers?

In an urban municipality's two-pipe separated sewer system, stormwater is collected through storm drains and travels through a separate pipe from the one that manages household sewage and wastewater.

Are drains and sewers the same?

A drain is a pipe that serves only one building, conveying water and waste water away to a sewer. A lateral drain is a section of drain positioned outside the boundary of a building, connecting with the drains from other buildings to become a sewer.

Which of the following is incorrect regarding circular sewer?

Which of the following is incorrect regarding circular sewer? Explanation: The circular section has uniform curvature, so it offers less opportunities for deposits.

Which of the following is incorrect regarding egg shaped sewer?

3. Which of the following is incorrect regarding Egg shaped sewer? Explanation: The Egg shaped sewer is expensive as more material is required than other sewer.

What percentage of water is available in water carriage system?

A water Carriage System is a method for the disposal of wastes, where water carries the wastes from its point of production to the point of treatment for final disposal. The wastes become liquid due to the high quantity of water (99.9%) and which is carried by the sewers.

What are the disadvantages of concrete pipe?

The main disadvantage is that concrete pipes are easily corroded at the crown because bacteria's decompose organic matter present in sewage, hence release Hydrogen sulphide (H₂S) gas which then in presence of moisture converts to Sulphuric acid, this acid then create small holes or patches which may result in corrosion ...

Can asbestos pipes corrode?

Asbestos cement pipe is resistant to corrosion, both internally and externally. This resistance has been demonstrated in tests run by the US Bureau of Standards on buried samples and by the US Bureau of Mines through tests conducted using corrosive mine-drainage water.

What is asbestos meaning?

Asbestos refers to a group of fibrous minerals used to strengthen and fireproof materials. When inhaled over long periods of time, asbestos fibers become trapped in the body and cause diseases such as mesothelioma, lung cancer and asbestosis.