Please enable JavaScript.

Coggle requires JavaScript to display documents.

Wastewater Engineering (2.0 ENVIRONMENTAL MICROBIOLOGY :red_flag:…

- - - - Refer to books OP. 1 or slide 01
- - - - In presence of sunlight, increase the DO Level in water. >>>> Supply oxygen to microorganisms
      - In wastewater treatment process, the presence of algae is compulsory in Waste Stabilization Pond (WSP)
    - - If there are too much Algae
        
        Reduce the intensity of light penetration.
        
        Die off >> disintegrate and cause anaerobic condition.
        
        Taste and smell problems.
  - - - According to energy and carbon sourcestext
        
        Autotroph; use inorganic materials as energy and carbon dioxide as carbon sources.
        
        Heterotroph; use the organic material as carbon and energy sources.
      - According to utilization of dissolved energy
        
        Aerobe; use DO during decomposition of organic compound.
        
        Anaerobe; use oxygen in the form of compound such as Nitrit and Sulphate.
        
        Facultative; able to survive in both of the condition above.
    - - Exponential Growth Phase (Reproduction):!:
      - Stationary Phase (Stagnant) :!:
      - Lag Phase (Adaptation) :!:
      - Death/Endogenous Phase (Decrease & Death) :!:
- - - - Colour
      - Odour :red_flag:
      - Temperature :red_flag:
      - Solids :red_flag:
        
        Measurement of Total Solids (TS)
        
        Measurement of Suspended Solids (SS) - Filter Paper used
        
        Dilution Method - if necessary
    - - A, Organic Compounds :red_flag:
        
        Sources
        
        Synthesis: from manufacturing process, like DDT and polyvinyl chloride.
        
        Fermentation: alcohols, acetone, glycerol, antibiotics, acids.
        
        Nature: fibres, vegetables oil, animal oils and fats, cellulose starch, sugar.
        
        Classification
        
        Biodegradable organics
        
        ((fast and easily oxidixed by microorganisms))
        
        ((food for microorganisms))
        
        i.e. starch, fat protein, alcohol, human and animal waste.
        
        Non-biodegradable organics
        
        ((difficult and take longer time to degrade))
        
        i.e. PVC, pesticide, industrial waste, cellulose, phenol, lignic acid.
        
        ((toxic to microorganisms))
        
        Properties
        
        Mostly serve as food source for microorganisms.
        
        Have very high molecular waste.
        
        Less soluble in water.
        
        Have lower melting and boiling points.
        
        Usually combustible
        
        Effects
        
        i. Depletion of the DO in the water
        
        Damaging the ecosystem
        
        Destroying aquatic life
        
        ii. Some organics can caused cancer
        
        Trihalomethane (THM-carcinogenic compound)
      - B. Inorganic Compounds :red_flag:
        
        Sources
        
        May cover nutrients (nitrogen and phosphorus), alkalinity, chlorides, sulphur and other inorganic pollutants.
        
        Effects
        
        Nitrogen and Phophorus
        
        Excessive algae breeding and aquatic plants (euthropication).
      - [ Biochemical Oxygen Demand (BOD) ]
      - [ Chemical Oxygen Demand (COD) ]
    - - Refer to book OP 21 for further explanation on the matter.