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Important Question And Answer: Planning For Sewarage Systems

   Posted On :  09.07.2016 07:42 pm

Important Question And Answer: Planning For Sewarage Systems

Important Question And Answer: Planning For Sewarage Systems

 

 

1.What are the types of treatment processes?

 

 

        Preliminary treatment

 

        Primary treatment

 

        Complete final treatment

 

        Secondary treatment

 

2. What are the various sources of wastewater generation?

 

 

        Industrial Wastes

 

        Domestic wastes

 

        Agricultural  Wastes

 

3.  List out the types of anaerobic biological units?

 

 

        Anaerobic lagoons

 

        Septic tank

 

        Inhoff tank

 

 

4.  What is means by screening?

 

Screening is the very first operation carried out at a sewage treatment plant and consists of passing the sewage through different types of screens so as to trap and remove the floating matter such as process of cloth, paper, wood, cork, hair, fiber etc.

 

 

5. What is the purpose of providing screen?

 

The main idea of providing screens is to protect the pumps and other equipments from the possible damages due to the floating matter of the sewage.It should be used for removing the floating matters.


6. What are the types of screen?

 

Classification based on size of the opening

 

        Coarse screens

 

        Medium screens

 

        Fine screens

 

 

7. Define bar screen?

 

Rectangular shaped coarse and medium screens are made of steel bars fixed parallel to one another at desired spacing on a rectangular frame and are called bar screen.

 

 

8. Define Communicators?

 

Comminutes or shredders are the patented devices, which break the larger sewage solids to about 6 mm in size. When the sewage is screened through them such devices are used only in developed countries like USA.

 

 

9. What is meant by Screening?

 

The material separated by screens is called the screenings. It contains 85 to 90% of mixture and other floating matter. It may also contain some organic load which may putrefy, lacing bad smells and nuisance.

 

 

10.            What are the methods adopted for disposal of screenings?

 

        Burning

 

        Burial

 

        Dumping

 

 

11.              Define Grit Chamber?

 

Grit chambers, also called or grit channels or grit basins, are intended to remove the inorganic particles (specific graving about 2.65) such as sand, graver, grit, egg, shells, bones etc of size 2 mm or larger to prevent damager to the pumps and to prevent their accumulation in sludge digesters.

 

 

12. Define unit process?

 

Methods of treatment in which the application of physical forces predominate are known as unit operations while methods of treatment in which chemical or biological activities are involved are known as unit process.


13. What are the types of unit operations & processes?

 

Physical unit operations

 

Chemical unit process

 

Biological unit process

 

 

14.Give any two advantages of unit operations/ process?

 

        It gives better understanding of the process as inherent in the treatment and of the capabilities of these processes in attaining the objectives.

 

        It helps in the development of mathematical and physical models of treatment mechanisms and the consequent design of treatment plants.

 

 

15.Define phase transfer?

 

Most waste water treatment process bring about changes on concentration of a specific substances by moving the substance either into or unit of the waste water it self. This is called phase transfer

 

16. Define definition time?

 

The definition time (t) of a settling tank may be defined as the average theoretical time required for the sewage to flow through the tank. Otherwise known as definition period or retention period

 

 

17. Define the term Displacement efficiency?

 

The                ratio    of   ughthe   period��Flowing tothrothe    �detention

 

displacement efficiency.

 

 

18. What is meant by principle of sedimentation?

 

The turbulence is retarded by offering storage to sewage these impurities tend to settle down at the bottom of the tank offering such storage. This is the principle of sedimentation.

 

 

19.   Define   the   term   �Sedimentation   Burin�?

 

The  burin  in  which  the flow  of  sewage  is  retarded  is  called  the  settling tank  or  the

 

sedimentation Tank or the sedimentation Burin.

 

 

20.   Define   the   term   �Detention   Period�?

 

The theoretical average time for which the water is detained is called the detention period.


21. Give any two advantage of chemical coagulation process in sewage treatment?

 

Sedimentation aided with coagulation produces better efficient with lesser BOD and suspended solids, as compared to plain sedimentation. Coagulated settling tank requires less space than that required by an ordinary plain settling tank.

 

 

 

 

22.What are the Demerits of coagulation in sewage treatment?

 

Cost of chemicals is added to the cost of sedimentation, with out much use, and thereby making the treatment costlier.

 

        The process of coagulation requires skilled supervision and handling of chemicals.

 

 

23.                  What are the types of sedimentation tank?

 

Based on flow

 

        Vertical flow tank

 

        Horizontal flow tank

 

        Radial flow tank

 

According to use

 

        Primary

 

        Secondary

 

 

24.What are the chemical used for precipitation of sediment?

 

Alum

 

Ferrous sulphate

 

Ferric sulphate

 

Ferric chlorides

 

Sodium alluminate

 

Sulphuric acid

 

lime

 

copperas


 

25.What are the factors that affect the precipitations?

 

        Kind of chemical

 

        Quality of chemical

 

        character and concentration of sewage

 

        Ph values of sewage

 

        time of mixing and flowlations

 

        Temperature

 

        Violence of agitation

 

26.What are the merits of chemical precipitation?

 

 

           More rapid and through clarification

 

           Removal of higher percentage of suspended solids.

 

           Simplicity of operation

 

           Small size tank is enough

 

 


 

Tags : Civil - Environmental Engineering - Planning For Sewerage Systems
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