What is the secondary treatment of waste water?
Read this article to learn about the secondary treatment of waste water. The secondary treatment is also known as biological treatment. It is capable of abating biodegradable dissolved and/or suspended organic substances. By secondary treatment it is also possible to remove dissolved nitrogenous and phosphorous compounds from a waste water stream.
What are the different types of wastewater treatment?
1 Primary Wastewater Treatment. Primary treatment of wastewater involves sedimentation of solid waste within the water. ... 2 Secondary Wastewater Treatment. Secondary treatment of wastewater makes use of oxidation to further purify wastewater. ... 3 Tertiary Wastewater Treatment. ...
What materials are used in wastewater treatment?
Substances like activates carbon and sand are among the most commonly used materials that assist in this process. Wastewater treatment may entail a bit more than these three steps, but they are the basis of how traditional wastewater treatment facilities operate.
What is the biological treatment of waste water?
For biological treatment of waste water containing organic substances (dissolved and/or suspended) a host of microbes are used and the conditions maintained may be either aerobic or anaerobic.
Which of the following occurs during the secondary treatment of wastewater quizlet?
The secondary treatment of the liquid portion of wastewater involves all anaerobic respiration, thus the water is stirred or kept shallow to get rid of the oxygen. Wastewater treatment is entirely a chemical process not involving microbes.
What is the purpose of secondary wastewater treatment quizlet?
The purpose of secondary treatment is to remove the suspended solids that did not settle out in the primary tanks and the dissolved BOD that is unaffected by physical treatment.
Why does secondary treatment of wastewater require O2?
Why does secondary treatment of wastewater require O2? - to encourage microbial growth. p. 787 - microbial growth is actively encouraged during secondary treatment, allowing aerobic organisms to oxidize the biologically degradable organic material to carbon dioxide and water.
Which waste water treatment process is responsible for removal of most of the BOD and sewage?
4) The purpose of tertiary sewage treatment is to remove all of the phosphorus, nitrogen, and BOD left from secondary treatment.
What is the purpose of secondary treatment in wastewater?
Secondary Treatment The secondary stage of treatment removes about 85 percent of the organic matter in sewage by making use of the bacteria in it. The principal secondary treatment techniques used in secondary treatment are the trickling filter and the activated sludge process.
What is the purpose of secondary treatment?
Secondary treatment removes the soluble organic matter that escapes primary treatment. It also removes more of the suspended solids. Removal is usually accomplished by biological processes in which microbes consume the organic impurities as food, converting them into carbon dioxide, water, and energy…
Which of the following treatment is considered as secondary treatment *?
Secondary treatment is the removal of biodegradable organic matter (in solution or suspension) from sewage or similar kinds of wastewater. The aim is to achieve a certain degree of effluent quality in a sewage treatment plant suitable for the intended disposal or reuse option.
Why aeration tank is used in a secondary treatment process?
The activated sludge process is the most common option in secondary treatment. Aeration in an activated sludge process is based on pumping air into a tank, which promotes the microbial growth in the wastewater. The microbes feed on the organic material, forming flocks which can easily settle out.
What steps are taken during secondary treatment of wastewater?
Secondary Wastewater Treatment TREATMENTActivated Sludge Process (ASP) / Extended Aeration System (EAS)Sequential Batch Reactor (SBR)Moving Bed Bio Film Reactor (MBBR)Membrane Bioreactor (MBR)
Which of the following puts the secondary treatment of wastewater in the correct order?
Which of the following puts the secondary treatment of wastewater in the correct order? Bacteria seeded in aeration tank as air is circulated throughout the water- bacteria multiply and eat waste; bacteria settle in clarifier.
Why is secondary treatment a biological process?
Secondary treatment removes the dissolved organic matter by the use of biological agents and hence, known as biological treatment. This is achieved by microbes which can consume and degrade the organic matter converting it to carbon dioxide, water, and energy for their own growth and reproduction.
What is primary and secondary treatment of sewage?
Primary treatment works on sedimentation, where solids separate from the water through several different tanks. In contrast, secondary treatment uses aeration, biofiltration and the interaction of waste throughout its process.
When species present in an ecosystem do not use the same substrate (food) their environmental requirement is different?
When the species present in an ecosystem do not use the same substrate (food) their environmental requirement is different and they do not utilize the metabolic products and by-products of one another then there interaction is said to be neutral. In a community of micro-organisms in any ecosystem such an interaction is very rare.
When to add nitrogen bearing compounds to wastewater treatment unit?
For synthesis of proteins and nucleic acids nitrogen bearing compounds are to be added to a wastewater treatment unit if those are not present as a constituent of the pollutants present.
What is secondary treatment?
The secondary treatment is also known as biological treatment. It is capable of abating biodegradable dissolved and/or suspended organic substances. By secondary treatment it is also possible to remove dissolved nitrogenous and phosphorous compounds from a waste water stream.
What is the process of biodegradation of organic substances?
These processes occur through a series of reactions, which are referred to as biochemical pathways.
What is secondary treatment of wastewater?
Secondary treatment of wastewater makes use of oxidation to further purify wastewater. This can be done in one of three ways:
How is wastewater treated?
Primary treatment of wastewater involves sedimentation of solid waste within the water. This is done after filtering out larger contaminants within the water. Wastewater is passed through several tanks and filters that separate water from contaminants. The resulting “sludge” is then fed into a digester, in which further processing takes place. This primary batch of sludge contains nearly 50% of suspended solids within wastewater.
What is the third step in wastewater management?
This third and last step in the basic wastewater management system is mostly comprised of removing phosphates and nitrates from the water supply. Substances like activates carbon and sand are among the most commonly used materials that assist in this process.
How long does it take for a wastewater solution to be aerated?
The resulting mixture is then aerated for up to 30 hours at a time to ensure results.
Where does storm water enter the sewer system?
storm water that enters the sewer system from storm drain connections (catch basins), roof leaders, foundation and basement drains, or through manhole covers
What is treatment method?
treatment methods in which the removal or conversion of contaminants is brought about by the addition of chemicals or by other chemical reactions.
What is the process of removing SS and organic matter?
removal of a portion of SS and organic matter by settling or sedimentation
What is underground carriage system?
a separate underground carriage system specifically for transporting sewage from houses and commercial buildings to treatment or disposal
Can communicable diseases be transmitted by pathogenic organisms in wastewater?
communicable diseases can be transmitted by pathogenic organisms in wastewater
What is the main objective of secondary treatment?
The main objective of secondary treatment: To remove most of the fine suspended and dissolved degradable organic matter that remains after primary treatment, so that the effluent may be rendered suitable for discharge. Conventional secondary treatment can reduce the BOD's to below 20mg/l and Suspended Solids to below 30mg/l which is acceptable in ...
How much BOD is removed from wastewater?
Conventional sedimentation the major process in primary wastewater treatment, normally removes 60 to 70 % of suspended solids matter containing 30% to 40% of the BOD present in municipal wastewater, leaving 150 to 200 mg/ l of BOD's and about 100mg/l SS in the primary effluent.
What is the assimilative capacity of bod in water?
Tip: Assimilative capacity of BOD in water is not more than or should be less then 4mg/l.
What materials are used in attached growth processes?
Packing materials used in attached growth processes include rock, gravel, slag, sand, redwood and wide range of plastic and other synthetic materials
Is dissolved oxygen required in wastewater?
Are those where sufficed amount of dissolved oxygen is required into the wastewater to sustain aerobic action, as one of the major polluting effects of wastewater on streams results form the depletion of dissolved oxygen by the action of aerobic organisms in degrading the organic content of the waste. Practical aerobic biological treatment ...
