Secondary waste water treatment is called biological treatment because microorganisms are involved in the breakdown of organic matter in this phase of waste water treatment.
What is the biological wastewater treatment method?
Biological wastewater treatment method, also known as the conventional method, is a common and widely used method of treatment. It takes into account biodegradation bleaching by taking aid of several micro-organisms, fungi, bacteria, yeasts, and algae.
What is secondary treatment of sewage?
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. This helps to reduce the BOD of the sewage water.
What is the role of organic solids in biological wastewater treatment?
The organic solids present in the wastewater serve as food for the aerobic microorganisms. The only thing to be provided is the DO, which is essential for the respiration of the aerobic organisms. In the biological treatment processes the DO is supplied either through natural means or by mechanical means by agitation.
What is meant by secondary treatment?
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.
Is secondary treatment a biological process?
A: Secondary wastewater treatment is a biological treatment process designed to reduce the amount of organic materials in the wastewater before it is discharge to a disposal field for final treatment and dispersal in the soil. Secondary treatment produces a much higher quality of effluent than a septic tank.
Is secondary wastewater treatment biological?
Secondary wastewater treatment processes use microorganisms to biologically remove contaminants from wastewater. Secondary biological processes can be aerobic or anaerobic, each process utilizing a different type of bacterial community.
What is biological process in wastewater treatment?
The treatment of wastewater subsequent to the removal of suspended solids by microorganisms such as algae, fungi, or bacteria under aerobic or anaerobic conditions during which organic matter in wastewater is oxidized or incorporated into cells that can be eliminated by removal process or sedimentation is termed ...
Which of the following in sewage treatment is also known as biological treatment?
Secondary treatment of sewageSecondary treatment of sewage is also called biological treatment while primary treatment is called physical treatment.
What is meant by biological treatment?
A type of treatment that uses substances made from living organisms to treat disease. These substances may occur naturally in the body or may be made in the laboratory. In cancer, some biological therapies stimulate or suppress the immune system to help the body fight cancer.
What do you understand by secondary treatment of sewage water explain the various methods of biological 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.
Why is biological wastewater treatment important?
It's estimated that biological treatments can remove up to 90% of the wastewater's contaminants. Because all of the contaminants have not been removed, the wastewater is usually sent through a tertiary treatment process after the biological treatment.
What is biological treatment What are the advantages of biological treatment?
Compared to other treatment methods, biological methods have certain advantages such as (1) treatment technology is traditional and well understood; (2) enhanced efficiency in terms of organic content removal; (3) cost-effective; and (4) environment friendly and safe.
Why is it important to incorporate biological processes in wastewater?
In short, biological industrial wastewater treatment systems optimize the naturally occurring process of microbial decomposition to break down industrial wastewater contaminants so that they, along with other unwanted materials, can be removed.
What is sewage write a note on the secondary or biological treatment of sewage?
Solution : Secondary treatment of sewage is as follows (i) This treatment is also known as biological treatment because it involves the use of microbes or biota for the treatment of sewage....QuestionChapter NameMicrobes In Human WelfareSubjectBiology (more Questions)Class12thType of AnswerVideo4 more rows•Apr 17, 2022
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 accomplished by bringing the sewage, bacteria and oxygen together in trickling filters or within an activated sludge process.
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 ...