Full Answer
Which of the following is the primary treatment of sewage?
Filtration and sedimentation [Physical process] to remove floating debris and heavy particles respectively are primary treatment of sewage. What does primary treatment mean? (PRY-mayr-ee TREET-ment) The first treatment given for a disease.
What is a sewage treatment plant?
The sewage treatment plant provides a suitable environment, albeit of steel and concrete, for this natural biological process. Removal of soluble organic matter at the treatment plant helps to protect the dissolved oxygen balance of a receiving stream, river, or lake.
What is a primary chamber in a sewage treatment plant?
The primary chamber acts as the collection and holding tank for the raw sewage. These tanks are equipped with level sensors and float switch to detect sewage level and avoid overflow. This is the place where the heaviest of the particle settles down and the rest moves to the aeration chamber.
What is a comminutor used for in sewage treatment?
A comminutor may be used to grind and shred debris that passes through the screens. The shredded material is removed later by sedimentation or flotation processes. Primary and secondary treatment of sewage, using the activated sludge process.
What methods are used in primary treatment of wastewater?
There are three basic biological treatment methods: the trickling filter, the activated sludge process, and the oxidation pond.
What equipment is used for wastewater treatment?
Wastewater treatment equipment also includes trash rakes, clarifiers, filters, demineralizers, degasifiers, centrifuges, and sludge dryers. Many different types of filters are used. Examples include sand filters, neutralizing filters, oxidizing filters, activated carbon filters, and crossflow filtration systems.
What is the steps involved in primary treatment of sewage?
The incoming wastewater passes through screening equipment where objects such as rags, wood fragments, plastics, and grease are removed. The material removed is washed and pressed and disposed of in a landfill. The screened wastewater is then pumped to the next step: grit removal.
What machines or materials are in water treatment plants?
In general, some of the most-needed industrial water treatment systems typically include:Raw water treatment systems.Boiler feed water treatment systems.Cooling tower water treatment systems.Demineralization and ultrapure water treatment systems.Wastewater treatment systems.
What is water equipment?
Water Equipment means any water plant, water mains, water trunk. Sample 1Sample 2Sample 3. Based on 8 documents. 8. Save.
Which of the following is a primary treatment?
Which of the following is a primary treatment? Explanation: Primary treatment includes physical and chemical methods like sedimentation, coagulation, etc. It will considerably reduce the Biochemical Oxygen Demand of the resulting effluent.
What is the first step in primary sewage treatment plant?
Primary treatment in sewage treatment involves physical removal of particles (large and small) from the sewage through filtration and sedimentation. Initially floating debris is removed by sequential filtration. Then the grit (soil and small pebbles) are removed by sedimentation.
What are the 3 types of sewage treatment?
Sewage treatment is done in three stages: primary, secondary and tertiary treatment.
What are the process involved in primary treatment?
Secondary sewage treatment is mainly a biological process. In secondary treatment primary effluent is passed into large aeration tanks, where it is...
What is meant by secondary treatment?
Secondary treatment is the second step in most waste treatment systems during which bacteria consume the organic parts of the wastes. This is accom...
What is primary treatment of sewage class 12?
Primary Treatment: This step involves the removal of physical particles from the sewage by filtration and sedimentation. First, all the floating de...
What is primary treatment of sewage shaala?
Filtration and sedimentation [Physical process] to remove floating debris and heavy particles respectively are primary treatment of sewage.
What does primary treatment mean?
(PRY-mayr-ee TREET-ment) The first treatment given for a disease. It is often part of a standard set of treatments, such as surgery followed by che...
What is the difference between primary and secondary treatment?
Primary treatment works on sedimentation, where solids separate from the water through several different tanks. In contrast, secondary treatment us...
What is primary and secondary treatment for sewage?
In the primary stage, solids are allowed to settle and removed from wastewater. The secondary stage uses biological processes to further purify was...
What is primary treatment in sewage treatment?
Primary treatment removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, commin...
What is the first process in primary wastewater treatment?
The first process in Primary Treatment for Wastewater is screening. I will show you the screening process and different types of screens used in primary wastewater treatment.
How does a screen work in wastewater treatment?
According to the method of cleaning, the screens can be manually cleaned or mechanically cleaned screens. For manually cleaned racks the aperture size ranges from 25-50 mm and 5 to 40 mm for mechanically cleaned racks.
What is sedimentation tank?
In the sedimentation tanks, sludge (the organic component of the sewage) settles out of the wastewater . Mechanical scrapers in the tank’s base continuously move accumulated sludge to a hopper, where it is pumped to sludge treatment facilities. The thickening step removes some of the water before processing the sludge in digesters.
What happens to wastewater after screening?
The wastewater after screening enters a grit chamber to settle the grit particles like sand, pebbles etc.
What are the constituents of scum?
Lighter materials rise to the surface as sludge settles to the bottom of the sedimentation tanks. The constituents of ‘scum’ are grease, oils, plastics, and soap. Scum is skimmed off the surface of the wastewater by slow-moving rakes. Scum is thickened before being poured into the digesters with the sludge.
What is the channel velocity of a wastewater treatment system?
The channel approach velocities fall in the range of 0.3 to 0.6 m/s for manually cleaned racks and from 0.6 to 1.0 m/s for mechanically cleaned racks.
What is primary treatment?
Primary treatment for wastewater involves temporarily storing sewage in a calm basin where heavy materials sink and oil, grease, and lighter solids float to the top. Wastewater reaching a treatment plant through pipes first undergoes primary treatment irrespective of its source.
