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- 1. are organic proteins which can speed up the biochemical reaction that occurs mainly outside or on the microbial cell surface. 2. Clean surface waters are normally saturated with . , which can be removed rabidly in the aerobic oxidation. 3. . and .. are the most importance two measures in water quality required to stabilize the wastewater. 4. The . process are responsible to limits the polluting discharge effect and the recovery time in rivers.Which type(s) of organism/s does not produce enzymes needed to breakdown toxic forms of oxygen? Select all that apply. a. Obligate aerobes b. Facultative anaerobes Oc. Microaerophiles Od. Aerotolerant anaerobes De. Obligate anaerobesWhich of the following treatments of sewage involves the use of anaerobic bacteria?A. Primary sedimentation tanksB. Aeration tanks in secondary treatmentC. Settling tanks in secondary treatmentD. Flat plate collectorE. Sludge digester
- 1. Which of the following micro-organisms are the most resistant to heat sterilization? a. Vegetative bacteria (e.g., Samonella spp.) b. Spore-forming mesophilic bacteria (e.g., Clostridium botulinum) c. Spore-forming thermophilic bacteria (e.g., Bacillus stearothermophilus) d. Toxicogenic bacteria (e.g., E. coli O157:H7) e. All of the above are equally resistant to heat sterilization.Microaerophilic bacteria a. are killed at atmospheric oxygen b. grow well in 20% 02 incubator c. obligate aerobes d. obligate anaerobes e. a and b a. a b. b С. С d. d е. eWhy does secondary treatment of wastewater require O2? A. Secondary treatment relies on anaerobic microbes to oxidize organic material. B.Secondary treatment relies on anaerobic microbes to reduce organic material. C.Secondary treatment relies on aerobic microbes to oxidize organic material. D.Photosynthetic bacteria are involved in secondary treatment and they require O2. E. Flocs require oxygen to facilitate biofilm formation.
- 2. a. explain 5 methods of nutrient uptake by cells b. explain the problems that may arise in the process of media sterilization using heatE 1 а. If wastewater which is high in DOM, nitrates and phosphates is released into rivers, what is the likely consequence to animal life in the river downstream of the source of pollution? b. How are microbes involved in this process? c. How can microbes be involved in the recovery of animal life in the river further downstream?2. The operations staff at a sewage treatment plant has decided to reduce the SRT of their activated sludge process from 6 days to 3 days by increasing the recycle rate. The goal is to reduce the oxygen requirement. You have been called in as an expert to give a qualitative assessment of this plan. a. Will the oxygen requirement actually be reduced? b. Will the MLVSS increase, decrease or stay about the same? c. Will the sludge settling characteristics improve, stay about the same, or worsen? d. Will the effluent BOD concentration increase, decrease, or stay about the same? 3. Filamentous bacteria that cause sludge foaming in activated sludge treatment systems differ from the desirable floc-forming bacteria in several aspects of their metabolism. First, filamentous bacteria have different growth curves than floc-forming bacteria as shown in the figure below. Second, filamentous bacteria use only oxygen as an electron acceptor and cannot use nitrate for that function; floc-forming…
- Which can infect hur Table 1: Absorbance and appearance of broth tubes at various temperatures. E. colin B. stearothermophilus Temperature°C Absorbance Visual Absorbance Visual 4 0.04 Clear 0.06 Clear tre Light turbid Very turbid Almost clear 25 0.66 0.09 Clear Light turbid Very turbid 37 1.48 0.55 which 55 0.25 1.29 oledzethe mes he alhe ive to edeut et brahell bras atnstooinieib o ho leviviue zwolls ti saunV e. kidney stones Which of the following microorganisms require the major available (aW) of water to proliferate? ¿Cuál de los siguientes microorganismos requiere la mayor cantidad de agua disponible (aW) para proliferar? O Penicillium spp. O Xeromyces spp. O Escherichia coli O Pseudomonas aeruginosa O Staphylococcus aureus Mention and describe the two types of bacterial resistance to antibiotics. Mencione y describa los dos tipos de resistencia bacteriana a los antibióticos. A-1. Define the following terms: a. Chermolithoheterotroph b. Microaerophile c. Chermoorganoheterotroph d. Obligate anaerobe e. Facultative anaerobic f. Coliform