Which of the following is a disadvantage with respect to the size of the sewer?

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. As the size of the sewers is large, it becomes difficult to handle and transport the sewer pipes.

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?

Combined sewers can cause serious water pollution problems during combined sewer overflow (CSO) events when combined sewage and surface runoff flows exceed the capacity of the sewage treatment plant, or of the maximum flow rate of the system which transmits the combined sources.

What is disadvantage of separate sewerage system?

Disadvantages of Separate System

Cleaning of sewer is difficult due to their small size. The self cleansing velocity is not easily obtained. The storm sewers come in operation in rainy season only. They may be chocked in dry season by garbage.

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.

What are the disadvantages of sewage treatment plant?

What are the factors that affect the quantity sewage to sewer?

What are the advantages of separate sewer system?

1) It combines the advantages of both the combined system and separate system. 2) The entry of stormwater prevents the silting of the sewer. 3) The sewers are of reasonable size. 4) The problem of disposing stormwater from houses is simplified.

Why are combined sewer systems Bad?

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.

What are the effects of a combined sewer overflow?

When combined sewer systems overflow, these wet weather discharges release a combination of stormwater, untreated human and industrial waste, oil and grease, metals, sediment, deicing chemicals, floating debris, and other stormwater pollutants into our waterways.

How does combined sewer overflow happen?

Treatment plants are unable to handle flows that are more than twice the design capacity. When this occurs, a mix of stormwater and untreated sewage discharges directly into the City's waterways. These events are called combined sewer overflows (CSOs).

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.

How does sewage treatment affect the environment?

When discharged in large quantities, it can raise the temperature of receiving streams locally and disrupt the natural balance of aquatic life. The acidity or alkalinity of wastewater affects both treatment and the environment.

What are the advantages and limitations of septic tanks in sewage treatment?

Septic tank allows the wastewater to be replenished by natural means and the treated water can also be re-used for purposes such as industrial works, irrigation, groundwater recharge etc. 4. Septic tanks are vital for the safe disposal of the night soil particularly from the latrines in rural areas.

What are the factors affecting the selection of materials for sewer construction?

1) Carrying capacity of the pipe. 2) Durability, strength, and life of the sewer pipe. 3) Imperviousness and weight. 4) Resistance to corrosion and abrasion.

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.

What are the three major problems with wastewater?

What are the biggest problems with wastewater treatment?

There are four major challenges facing operators of wastewater treatment plant and these can be split into four broad categories which are energy consumption, people skills and competence, dealing with sludge, and footprint and facilities.

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 piping?

Asbestos seemed the ideal material for pipe making and pipe wrapping. Asbestos fibers were lightweight while adding tensile strength to all sizes of pipes. Asbestos fibers were also very smooth. This characteristic gave pipes' inner walls a slick surface, reducing friction and lowering pumping efforts.