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Q: Why is secondary treatment of water in sewage treatment plant called biological treatment?
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- The activated sludge process was developed from empirical knowledge and is now widely used for wastewater treatment. From a microbial point of view, i. Discuss how the ecology of different sectors of the process can be defined. ii. Design an experiment to understand how an efficient process differs from one with problems, such as sludge bulking.Chlorinating swimming pools is an example of______________ to control microbial populations. A. employing halogens B. employing heavy metals C. employing surfactantsWhy canal/pond water supports growth and development of microbes?
- What is the difference in microbial population from water sediment and neustonic source? A. Ratio of phototrophic and heterotrophic microbes. B. Ratio of anaerobic microbes to aerobic microbes. C. Ratio of heterotrophic and cellulolytic microbes. D. All statements are acceptable descriptions.Imagine a sewage plant that is releasing sewage containinghigh levels of ammonia and phosphate and very low levels oforganic carbon. Which types of microbial blooms might betriggered by this sewage?Why is algae being grown in wastewater
- The conversion of ammonia to nitrate, known as _______________, is a two-step process performed by soil bacteria. (a) nitrogen fixation (b) nitrification (c) assimilation (d) ammonification (e) denitrificationWhich of the following requires aerobic conditions? Question 7 options: A) nitrogen fixation B) sludge digestion C) primary sewage treatment D) secondary sewage treatmentYou are responsible for the bioremediation of soil contaminated by jet fuel. Your coworker suggests you fertilize the soil with nitrogen and phosphorus to promote the growth of naturally occurring hydrocarbon-degrading microbes. However, you just read about a new mixture of microbes sold in a slurry with nutrients and a surfactant. What data do you need to collect to decide which approach would be best? How will you obtain these data?
- Which of the following microorganisms are not derivedfrom human pollution but can be found in water supply systemsand are considered “nuisance” organisms?(a) Coliform bacteria (d) Thiobacillus(b) Rhizobium (e) Clostridium(c) AzotobacterBacteria that thrive in puncture wounds are likely to be (a) aerobes (b) photoautotrophs (c) chemoautotrophs (d) endospores (e) obligate anaerobesUse of synthetic fertilizers often leads to the contamination of groundwater with nitrates. Nitrate pollution is also a suspected cause of anoxic "dead zones" in the ocean. Which of the following processes is most likely to help reduce nitrate pollution? A. adding methanogens to the soil B. adding nitrifying bacteria to the soil C. adding denitrifying bacteria to the soil D. using ammonia instead of nitrate as a fertilizer