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- State the purpose and importance of each process step in wastewater treatment.Explain why desiccation and cold are not reliable methods of disinfectionbut how they can still be effective in microbial control.Describe situations that require high-level disinfection and thosefor which medium- or low-level disinfection is adequate.
- Describe the concept behind sterilization by fi ltration, including examples of applications.Outline the different physical and chemical methods of sterilization. Briefly describe how each method control microbial growthexplain these types of microbial control methods: Refrigeration and freezing , Desiccation and Lyophilization, osmotic pressure, radiation and its effect to microorganisms.
- Give a brief but critical discussion about microbial growth in natural environments and how it differs from the laboratory culturing of micro-organisms.Another method of microbial control is filtration. List down at least 5 kinds of filters which could be used for this method?Defi ne and diff erentiate among the major terms for microbial control, citing examples of each.
- What summary can be drawn from the stab slant and surface inoculation.Microorganisms are used in the nitrogen removal process. Discuss why it isn't part of the secondary treatment, often known as biological water treatment.Identify the method of preservation and maintenance of microbial cultures based on the period of time upom which microbes can be stored. 1-2. More than 40 years: _______ or ________3. One to two years: ___________ 4. Up to 3 years: ____________ 5. 1 months: _________