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Higher Study | Environmental Engineering | Sewage

Biodegradable pollutants are
As per Manual on Sewerage and Sewage Treatment, Central Public Health and Environmental Engineering Organization, Ministry of Urban Development, Government of India, when a sewer connects with another sewer having a difference of 600 mm in level between the water lines (peak flow levels) of main line and the invert of branch line, the connection may be provided using a
Statement (I): When waste water is treated at an oxidation ditch, anaerobic sludge digester is not required. Statement (II): Oxidation ditch admits an extended aeration process whereby sludge gets mineralized.
Consider the following statements as regards a Septic Tank: 1. The size required is large and uneconomical when serving more than roughly 100 persons. 2. It can remove around 90% of BOD and 80% of suspended solids. 3. As compared to the sludge holding of a plain sedimentation tank, a septic tank can hold about 90% less of sludge volume. 4. Frequent removal of sludge is not required. Which of the above statements are correct?
Statement (I): Anaerobic sludge digester, by itself, is considered to be the better method than other methods of sludge treatment: Statement (II): During anaerobic sludge digestion, CH4 is produced; also rodents and other pests are attracted when digester sludge is dried. 
When waste water is disposed of into a running stream, four zones are formed. In which one of the following zones will the minimum level of dissolved oxygen be found?
The domestic sewage of a town was tested for total solids and the following results were obtained : Weight of sample of sewage = 1000 gm Weight of solids after evaporation of liquid = 0.952 gm Weight of dry residue after ignition = 0.516 gm What is the value of volatile solids?
There are three distinct stages that occur in the natural process of sludge digestion due to biological action. What is the name of the first stage in which fresh sewerage – sludge is acted upon by anaerobic and facultative bacteria’s which decompose easily available food matters?
What is the full form of CETP?
What is partly or completely treated sewage flowing out of a sewage treatment tank or plant called?
The different actions that take place in anaerobic decomposition process are 1. Alkaline fermentation 2. Acid fermentation 3. Acid regression 4. Methane formation What is the correct sequence of these actions (from earlier to later)?
What value of flow is usually considered for designing sewage treatment units?
The pipes which are NOT suitable for water carrying but quite suitable for sewage and drain or sewage disposal is:
Which one of the following is INCORRECT about design consideration of sewers system?
Which of the following is INCORRECT for the characteristics and quality of a good Trap?
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