Microbes in Sewage Treatment and Biogas Production

Flocs produced in the secondary treatment plant of the sewage comprises of:

Anaerobic sludge digesters produce which of the following gas?

Passage of effluents into oxidation tank is for:

Why we use aerobic bacteria in secondary/biological treatment?

 Name one condition that should be maintained in a sludge digester where biogas is produced.

The primary effluent in the treatment of sewage is sent to tanks for secondary treatment in the presence of aerobic bacteria. How would the BOD of the effluent be affected if anaerobic bacteria are used for secondary treatment? 

Assertion: Constant agitation of primary effluent in large aeration tanks promotes vigorous growth of useful anaerobic bacteria.

Reason: The microbes consume the major part of the organic matter and reduces the BOD of the primary effluent.

The correct option among the following is:

What is primary treatment in biology?

During sewage treatment, the biogas producing bacteria

What is aeration activated sludge?

Identify the "X" in the biogas plant and mention its function.

Water samples were collected at points A, B and C in a segment of a river near a sugar factory and tested for BOD level. The BOD levels of samples A, B and C were 400 mg/L, 480 mg/L and 8 mg/L respectively. What is this indicative of? Explain why the BOD level gets reduced considerably at the collection point C?

What do you understand by biological oxygen demand?

In STP the biological treatment is completed with the help of

BOD is the biological method used for the measurement of the total amount of dissolved oxygen (DO) used by microbes in the biological process of metabolizing organic molecules present in water.

Write a note on BOD.

What are the key differences between primary and secondary sewage treatment.

The decay of organic matter in water is measured as biochemical oxygen demand.

_____ sludge is formed during the secondary sewage treatment.

Define activated sludge.