The following are related to wastewater treatment:

a What is the main purpose of the primary, secondary and treatment facility?
b. What is the percentage BOD removal in each of the primary and secondary treatment?
c. What are tve two commonly used approaches in the secondary (biological) treatment? What is the main difference between the two approaches? advanced treatment in a wastewater

A. - Primary wastewater treatment: the physical treatment process which is used to in order to get rid of suspended solids that can settle from wastewater.

- Secondary wastewater treatment: treatment processes remove waste organic ( which are once living/biological) material from wastewater, usually by the use of a biological treatment process.

-Tertiary wastewater treatment: Tertiary treatment isn't needed at all wastewater treatment plants, and the place it is needed, it may be different from one plant to another, depending on the type of water contamination that must be removed.

B. Primary treatment: Approximately 35% of the incoming biochemical oxygen demand (BOD).

Secondary treatment : Approximately 85% of biochemical oxygen demand (BOD).

C. - Activated Sludge, Rotating biological contractors.

Explanation:

A. Primary wastewater treatment refers to sedimentation, the physical treatment process which is used to in order to get rid of suspended solids that can settle from wastewater. The main goal of primary treatment is to remove organic and inorganic solids that settles by sedimentation, and by act of skimming removed materials end up floating.

Secondary wastewater treatment processes remove waste organic ( which are once living/biological) material from wastewater, usually by the use of a biological treatment process. The goal of secondary treatment is the further treatment of the effluent from primary treatment in order to get rid of the residual organics and suspended solids.

Advanced wastewater is quite in between. Tertiary treatment isn't needed at all wastewater treatment plants, and the place it is needed, it may be different from one plant to another, depending upon the type of water contamination that must be removed. Advanced treatment processes can be combined with primary or secondary treatment or used instead of secondary treatment.

B. Primary treatment: Approximately 35% of the incoming biochemical oxygen demand (BOD).

Secondary treatment : Approximately 85% of biochemical oxygen demand (BOD).

C.

-Activated Sludge: The activated sludge process is a kind of wastewater treatment process for treating sewage/industrial wastewaters by the use of aeration and a biological floc which consists of bacteria and protozoa.

- Rotating biological contactor: Rotating biological contactors (RBCs) are fixed-film reactors that have similarities with biofilters in the sense that organisms are attached to support media.

Activated sludge is a suspended process, which is when the biomass is mixed with the sewage while in rotating biological contractor, the biomass grows on the media and then, the sewage passes over the surface.

a)Objective of primary treatment of water is simply the removal of organic and inorganic solids that are settleable. WHILE

Objective of secondary water treatment is the further treatment of the effluent remaining from the primary treatment for the removal of the residual organics and suspended solids.

b)The BOD for primary treatment of water is 35%

WHILE

The BOD for secondary treatment is 85%

c) Biological aerobic approach and Biological aerobic approach

cii) The difference is one occurs in the presence of oxgen while other in absence.

Explanation:A)Objective of primary treatment of water is simply the removal of organic and inorganic solids that are settleable, using sedimentation, and the removal of material that can float by skimming. Almost about 25 to 50% of the biochemical oxygen demand which is reffered to as BOD which is 50 to 70% of the total suspended solids and also 65% of the oil and grease are removed during primary treatment.

Many organic elements such as nitrogen, organic phosphorus, and heavy metals that are solids are also removed during primary sedimentation while the colloidal and dissolved constituents are not affected.

WHILE

Objective of secondary water treatment is the further treatment of the effluent remaining from the primary treatment for the removal of the residual organics and suspended solids.

Often, the secondary treatment is usually carried out after primary treatment and involves the removal of biodegradable dissolved and colloidal organic matter using aerobic biological treatment processes.

B) The BOD for primary treatment of water is 35%

WHILE

The BOD for secondary treatment is 85%

C)Aerobic, as the can be explained as the biological treatment of water in the presence of air i.e oxygen, for the removal of particles during water ttreatment.

WHILE

Anaerobic Biological treatment approach takes place in the absence of air (oxygen). These two approach are directly related to the type of bacteria or microorganisms which are present in the degradation of organic waste in given wastewater and the operating conditions of the bioreactor

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