What is the role of micro-organisms in sewage treatment?
Jun 16, 2015 · Choose the one alternative that best completes the statement or answers the question. 1) Bacteria that emit. Chapter 27 - Chapter 27 MULTIPLE CHOICE. ... Which of the following is an assimilation process ? A ) ... Which one of the following processes in sewage treatment requires bacterial metabolism ? A ) ...
What are the general processes of sewage treatment?
Mar 28, 2017 · 39)Which one of the following processes in sewage treatment requires bacterial metabolism? 39) A) removal of BOD B)sedimentation C) chlorination D) primary treatment E) None of the answers is correct. Answer: A
What is the difference between primary and secondary sewage treatment?
Which one of the following processes in sewage treatment requires bacterial metabolism? A. chlorination B. sedimentation C. primary treatment D. removal of …
How are microorganisms categorized by their metabolism?
Which one of the following processes in sewage treatment requires bacterial metabolism? Removal of BOD. Which of the following is NOT characteristic of fecal coliforms? pathogenic. Aerobic respiration occurs in. secondary sewage treatement. Drinking water supplies are routinely tested for the presence of.
Which typical wastewater treatment process is responsible for removal of most of the BOD in sewage?
Primary treatment settling removes about half of the solids and a third of the BOD from raw sewage. Secondary treatment is defined as the "removal of biodegradable organic matter (in solution or suspension) and suspended solids.
What stage of sewage treatment produces methane?
Methane is emitted during the handling and treatment of municipal wastewater through the anaerobic decomposition of organic material. Most developed countries rely on centralized aerobic wastewater treatment systems to collect and treat municipal wastewater.
Which of the following is an example of a process made possible via symbiosis?
Infection thread is formed. Which of the following is an example of a process made possible via symbiosis? Cattle and sheep graze on cellulose-rich plants.
Which of the following is a common source of antibiotics?
Antibiotics commonly are produced by soil microorganisms and probably represent a means by which organisms in a complex environment, such as soil, control the growth of competing microorganisms. Microorganisms that produce antibiotics useful in preventing or treating disease include the bacteria and the fungi.
What is the first step in the sewage treatment process?
Treatment StepsStep 1: Screening and Pumping. ... Step 2: Grit Removal. ... Step 3: Primary Settling. ... Step 4: Aeration / Activated Sludge. ... Step 5: Secondary Settling. ... Step 8: Oxygen Uptake. ... Sludge Treatment.
Which of the following is an anaerobic process of treating wastewater?
The anaerobic microorganisms, or “anaerobes” convert the organic pollutants present in wastewater into biogas. Most of the biogas comprises methane and carbon dioxide. The biogas can be used as an alternative for fuel after it is treated to reduce or eliminate hydrogen sulphide.Jul 16, 2021
Which of the following processes is also known as ammonification?
In marine ecology, ammonification is also referred to as ammonium regeneration and ammonium recycling. The term “nitrate ammonification” is sometimes used to refer to the dissimilatory reduction of nitrate to ammonium (e.g., Rysgaard et al., 1996).
Which of the following nitrogen cycle processes produces the greenhouse gas N2O?
Which of the following nitrogen cycle processes produces the greenhouse gas N2O? -Denitrification produces the greenhouse gas N2O through the reaction 2 NO3- → 2 NO2- → 2 NO → N2O → N2. Excess nitrates from fertilizers increase the rate of denitrification and the amount of N2O released into the atmosphere.
Which of the following is not required for biological nitrogen fixation?
Azotobacter species are free-living, nitrogen-fixing bacteria, they normally fix molecular nitrogen from the atmosphere without symbiotic relations with plants. But saccharomyces is the genus of fungi and not related to Nitrogen fixation but involves in the process of fermentation. Hence option C is correct.
Which of the following bacteria produce the most antibiotics?
Streptomyces is the largest antibiotic-producing genus, producing antibacterial, antifungal, and antiparasitic drugs, and also a wide range of other bioactive compounds, such as immunosuppressants. They produce over two-thirds of the clinically useful antibiotics of natural origin.Jan 3, 2021
What are the antibiotics produced by bacteria?
Penicillin and other antibioticsSome clinically important antibioticsAntibioticProducer organismActivityNeomycinStreptomyces fradiaeBroad spectrumStreptomycinStreptomyces griseusGram-negative bacteriaTetracyclineStreptomyces rimosusBroad spectrum10 more rows
Which type of bacteria produce most antibiotics?
During the “Golden Age” of antibiotic discovery, 70-80% of all discovered antibiotics came from a single genus of bacteria; Streptomyces.Apr 10, 2019
Why is the environment of sewage treatment plant controlled?
The environment of the sewage treatment plant has to be controlled precisely because bacteria are sensitive to the oxygen level, pH level, temperature, and level of nutrient. In order for efficient degradation of biological matter to occur, these factors are controlled manually.
What is sewage treatment?
Sewage treatment is a process in which the pollutants are removed. The ultimate goal of sewage treatment is to produce an effluent that will not impact the environment [1] . In the absence of sewage treatment, the results can be devastating as sewage can disrupt the environment. The general processes of sewage treatment are primary, ...
How does tertiary treatment work?
In tertiary treatment, the removal of excess organic matter is enhanced by settling the sewage in a lagoon. This process is also aerobic, but it depends on the diffusion of oxygen because most organic matter has been degraded by secondary treatment [5] .
What is the pH of nitrification?
They oxidize ammonium into nitrite. This bacterium prefers a pH around 6-9 and nitrify optimally at 20-30°C [4] .
Why is temperature important for bacteria?
Bacterial growth is sensitive to temperature because high temperature can increase the fluidity of the phospholipid bilayer which leads to cell lysis. However, bacteria are known to have higher enzymatic activity at higher temperature ...
How does acidity affect organic matter?
Acidity plays a crucial role in the breakdown of organic matter because pH affects the solubility of compounds which indirectly affect the accessibility by bacteria [8]. Also, bacteria responsible for organic matter degradation are sensitive to the pH of the environment. Extremely high or low pH levels are able to kill bacteria, ...
How does nitrification occur?
Nitrification occurs in two discrete steps. First of all, ammonium is oxidized to nitrite by Nitrosomonas.spp, and nitrite is further oxidized to nitrate by Nitrobacter.spp [4]. Phosphorous removal can occur biologically by the process of “enhanced biological phosphorous removal.”.