wastewaternotes - Waste Water Nature of Water Water is a...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Waste Water Nature of Water • Water is a key ingredient of life. One of the major uses of water is as a solvent and transport mechanism • This also holds true in many uses and natural processes using water Polar Molecule • One of the reason that water is such a good solvent (and some other properties like floating while is freezes) is due to the fact it is a polar molecule • Due to the uneven distribution of the electrons in the bonds on the O side it is slightly negative and the H side slightly positive - the molecule has slightly ‘charged poles’
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Other important properties • Another important property of water is that it has a high heat capacity. • This means water can store/absorb a lot of energy into it’s structure. • Another key property is that cold water dissolves gasses better, while hot water dissolves solids better • This polarity of the molecule is part of the reason water is also so good at dissolving many different type of materials. • Water cannot dissolve all materials, but it is one of the most versatile solvents we know of (and it is naturally very abundant in the universe) Hydrological Cycle • http://en.wikipedia.org/wiki/Hydrological_c ycle • When consider any issues relating to water waste and water pollution we need an understanding of where the water comes from and where it goes • This is described by the hydrological cycle
Background image of page 2
3 • This movement of water is powered by solar energy (which evaporates water) and gravity which causes it to flow downward • We can also describe an artificial or urban water flow pattern • Here we withdraw water from the natural cycle treat it, consume it, produce waste water which is then returned to the natural cycle Water Cycles from BET • This means any waste which we do not filter out before returning the water to the natural cycle can be carried around the entire hydrological cycle • Some examples of problem materials mercury, sulphur(acid rain), lead, e.coli…
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Water Quality • For waste water and the processing in undergoes, a major issue is water quality • Measured by 3 parameters • Physical – which would include temperature, taste and odour • Chemical – this includes many factors which include acidity, dissolved materials, toxic and radioactive substances Water Quality • Biological – microrganisms (like bacteria or other larger organisms living in the water) and other organic substances in the water • Standards are set at levels which have been researched to be below the threshold at which damage to human health occurs. Waste Water • Waste water is produced from both home and industrial use • Here we will look at municipal waste water • There are many contaminants that are found in water from this source.
Background image of page 4
5 • When looking at waste water there are so many different substances found that they have to be lumped together into larger groups. • Material can also be dissolved, this is a
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/20/2010 for the course NATS Nats1840(A taught by Professor M.h.armour during the Fall '10 term at York University.

Page1 / 32

wastewaternotes - Waste Water Nature of Water Water is a...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online