Wastewater characterisation
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FlashcardsWhy might you characterise wastewater?
design treatment plan
monitor and control operations
meet legal requirements
detect long-term trends
What sort of things are being tested in gross pollution measures?
BOD, COD, grease, suspended solids, NH3
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17 Terms
Why might you characterise wastewater?
design treatment plan
monitor and control operations
meet legal requirements
detect long-term trends
What sort of things are being tested in gross pollution measures?
BOD, COD, grease, suspended solids, NH3
What sort of things are being tested for aesthetic appeal?
Colour, turbidity, taste, odour
What sort of tests can be done for the presents microbiological behaviour?
indicator organisms
What sort of things are being tested in tests for toxins?
pesticides, heavy metals, radioactivity
What sort of things are being tested in test for health-risk materials?
fluoride, nitrate
What sort of things are being tested in tests to determine suitability for other incidental uses?
Corrosion effects, Fe, Mn and hardness salts Ca and Mg
What sort of things are being tested in operational tests?
monitor plant performance
What are the pollution measures?
gross pollution measures
aesthetic appeal
microbiology
toxins
incidental use - suitability
determine process suitability
What is DO?
Dissolved O2
essential to aquatic life, minimum ~5 mg/L needed to sustain a balanced population of aquatic flora and fauna
saturation - at 15 degrees - 10.2 mg/L (~10ppm)
pollutant addition - decreases available DO - may render life unsustainable
What measures are done for solids?
suspended solids - SS
dry weight retained on filter
classified as fixed and volatile (organic)
dissolved solids
remains after SS test
salinity indicator - can be measured by EC
settleable solids
volume of settleable solids
imhoff cone
Nutrients - N & P
NH3-N
Most reduced from
composed of NH3 and NH-4 - unionised form most toxic
NO3-N
promotes excess growth
nitrite combines with haemoglobin - methemoglobin - blue baby in humans and brown blood disease in fish
Microbial measures and toxins
microorganisms
Key winery waste characteristics
BOD - explain