Environmental Engineering

A sewer that receives the discharge of a number of house sewers is called________________?

Byadmin January 17, 2019August 13, 2021

A sewer that receives the discharge of a number of house sewers is called________________?

A. house sewer
B. lateral sewer
C. intercepting sewer
D. submain sewer

Environmental Engineering

Period of cleaning of slow sand filters is about________________?

Period of cleaning of slow sand filters is about________________?

A. 24 – 48 hours
B. 10-12 days
C. 2-3 months
D. 1-2 year

Read More Period of cleaning of slow sand filters is about________________?
Environmental Engineering

In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be___________?

In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be___________?

A. 100 ppm
B. 200 ppm(Correct)
C. 300 ppm
D. 400 ppm

Read More In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be___________?
Environmental Engineering

Residual chlorine in water is determined by________________?

Residual chlorine in water is determined by________________?

A. starch iodide method
B. orthotolidine method
C. both (A) and (B)(Correct)
D. none of the above

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CHEMICAL ENGINEERING | Environmental Engineering

Main pollutants released from petroleum refineries is

Question: Main pollutants released from petroleum refineries is
[A].

CO, SO2 & H2S.
[B].
CO2, NO & SO3.
[C].
CO2, H2S & NO2.
[D].
SO3, NO2 & CO2.

Answer: Option A

Explanation:

No answer description available for this question.

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Environmental Engineering

Sludge volume index is defined as the ratio of_______________?

Sludge volume index is defined as the ratio of_______________?

A. percentage of sludge by volume to percentage of suspended solids by weight(Correct)
B. percentage of sludge by volume to percentage of total solids by weight
C. percentage of suspended solids by weight to percentage of sludge by volume
D. percentage of total solids by weight to percentage of sludge by volume

Read More Sludge volume index is defined as the ratio of_______________?
Environmental Engineering

Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?

Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?

A. calcium carbonate
B. magnesium carbonate
C. sodium carbonate
D. calcium hydroxide

Read More Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________?

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