METHODS OF WATER TREATMENT AT THE WATER-WIRED STATION 1. ozonation 2. coagulation, sedimentation, filtration 3. oligodynamic action of metals 4. chlorination
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- Describe, in order, the 6 steps of cleaning drinking water (filtration, flocculation, corrosion inhibitor, coagulation, chlorination, and sedimentation).Which of the following is not a stage in purification of drinking water?a. filtration b. chlorination c. activated sludge d. sedimentationThere is quite a bit of concern that chlorine used as a water purifi cation chemical presents serious dangers. What alternative methods covered by this chapter could be used to purify water supplies and keep them safe from contamination?
- I just did an acute toxicity experiment using treated and non-treated effluents with daphnia magna and my mortality rate was higher in the treated effluent. My question is why is treated pulp effluent more harmful than non-treated pulp effluent on daphnia magna? If possible please provide links for references, this is not an easy topic to find.Leachate production is whatWhy should caps of glassware be loosened first before sterilization? [Answer in not more than 2 sentences]
- Which of the following can most likely increase the yield of recrystallized benzoic acid? CHOICES: A fluted filter paper was used during cold filtration. The receiving flask from hot filtration does not contain a small amount of solvent. Activated charcoal was not added to the solution. The solution was filtered immediately after hot filtration.Which of the following is false?a) A high-level disinfectant cannot be used as a sterilant.b) Critical items must be sterilized before use.c) Low numbers of endospores may remain on semicritical items.d) Standard sterilization procedures do not destroy prions.e) Quaternary ammonium compounds can be used to disinfect food preparation surfaces.Water contaminants fall into two general categories, chemical and biological. Describe each category. What are disinfecting by-products (DBPs)? How are people exposed? What are the toxic effects? Which of the emerging public health issues related to water do you believe will have the most impact on the future of safe drinking water?
- A student is preparing a batch of broth media. He dispenses into tubes,but realizes he is running late for his date so he places the tubes in the refrigerator over night.the next morning forgetting he failed to sterelize media he uses for subculturing.dicuss possible resultsThe treatments which are generally given to treat water supplies, follow the sequence Select one: a. screening, sedimentation, filtration, disinfection b. screening, sedimentation, coagulation filtration, disinfection c. screening, sedimentation, disinfection, aeration d. screening, sedimentation, disinfection, filtrationDisinfectants and Sterilization Procedures Complete the table by putting (+) for growth of microorganisms or (–) absence of growth of microorganisms. Disinfectant Concentration Growth after time of exposure (minutes) Control 5 minutes 10 minutes 15 minutes Sodium hypochlorite 5% Sodium hypochlorite 0.05% Alcohol 70% Alcohol 40% Iodophor (Betadine) 10% solution Mouthwash Cetylpyridinium Chloride - 0.075% Sodium Fluoride - 0.05%