Solid Waste Management MCQ

Solid Waste Management MCQ 1

The aerobic method of mechanical composting practised in india is called:

1. Indore method
2. Bhopal method
3. Bangalore method
4. Nagpur method

Answer: A. Indore method

Solution

Decomposition of solid waste by composting is based on the two methods in India. Which are named as Banglore method and Indore method.

Indore method: As per Indore method of composting of solid waste, decomposition of solid waste will occur aerobically.

As per Indore method decomposition of solid waste will occur in 2 to 3 months.

As per Indore method of decomposition, mixing of solid waste will occur by manual or by mechanical way.

Bangalore method: As per Bangalore method of composting of solid waste, decomposition of solid waste will occur anaerobically.

As per Bangalore method decomposition of solid waste will occur in 5 to 6 months.

As per Bangalore method of decomposition, mixing of solid waste will not occur.

Solid Waste Management MCQ 2

The maximum C/N ratio in a Municipal solid waste compost is:

1. 10:1
2. 20:1
3. 30:1
4. 40:1

Answer: B. 20:1

Solution

C/N ratio shows the extent of composting required to Municipal solid waste and it also shows the maturity of composting

C/N ratio for an ideal finished compost should be in the range of 15 and 25.

High C/N ratio means if carbon content is high in municipal solid waste, it indicates that lesser stability to the composting and lower C/N ratio or higher nitrogen content in the municipal solid waste indicates low amount of organic matter.

During the composting process of municipal solid waste, the C/N ratio of waste constituents decreases.

Note: C/N ratio should be between 30 to 50 for optimum digestion of digestive material.

Solid Waste Management MCQ 3

Sludge bulking can be controlled by:

1. Chlorination
2. Coagulation
3. Denitrification
4. Aeration

Answer: A. Chlorination

Solution

Sludge bulking is a characteristic of settling of sludge particles.

Sludge bulking is categorised as poor characteristic of sludge settling

Bulking of sludge occurs due to the presence of filamentous microorganisms (fungi) in the sludge.

Presence of (fungi) in sludge is due to low content of nutrients, high sludge age and low F/M ratio.

Methods or Process to control bulking of sludge:

Bulking of sludge can be controlled by reducing the sludge age, keeping it less than 6 days.

Bulking of sludge can also be controlled by Chlorination of activated sludge which is returned to the aeration tank.

Bulking of sludge can also be controlled by adding nutrients into the sludge mixture. These nutrients should be in the ratio of BOD5 : N2 : P = 100 : 5 : 1

Solid waste management MCQ 4

In solid waste management, waste utilization is achieved by

1. Recover, Reclamation and Reproduce
2. Reuse, Reclamation and Recycling
3. Recover, Recycling and Reproduce
4. Reuse, Reproduce and Recycling

Answer: B. Reuse, Reclamation and Recycling

Solution

Waste utilization is one of the major issues in India for both Urban areas and rural areas.

Waste utilization can be done based on their characteristics.

Reuse of waste material can be done if it would be useful for more than one time. Reuse of waste material is an effective way of handling the waste.

Reclamation of solid waste is the converting the wastes into some useful products

Recycling of solid waste is done if it can be used after some changes into the waste materials.

Hence, waste utilization is achieved by Reuse, Reclamation and Recycling of the solid waste.

Solid waste management MCQ 5

An engineered facility for the disposal of municipal solid waste is called

1. Septic tank
2. Sanitary landfills
3. Dug wells
4. Tandom landfills

Answer: B. Sanitary landfills

Solution

Sanitary landfills is an engineered facility for the disposal of municipal solid waste in India.

Sanitary landfill is a method of disposing of municipal solid waste. In this method disposal of refuse types of waste is carried out.

In this method disposal of waste is being done in low lying areas and disposal is being done in the form of layers of 1.5 m thick.

After disposing of the refuse material of one layer, it is compacted properly and then it remains left for at least of 7 days. During this time aerobic decomposition will occur of waste. After that the next layer of waste is dumped over the previous layer and again it will be compacted.

For proper decomposition of waste material, It should have a minimum of 60% moisture content.

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