2.1 hard water (Hardness), the focus of which is divided into two kinds is temporary, which is hard because the carbon they contain substances and bicarbonate.Of calcium and magnesium dissolved are hard fixed section. Caused by havingCompounds of calcium sulfate and chloride and their magnesium melting is. Hard water is more than 300 mg/l CaCO3 (mg CaCO3/I) should not be used as drinking water.2.2 as the acid alkaline water (pH Value of Water) that has a value of normal water as acid. -Spotted between 6.5-8.5 or might be in the range of 5-9 and creatures in the water.The danger for drinking water pH is between 6-8.2.3 water dissolved oxygen (Dissolved Oxygen, or DO) oxygen.Soluble in water, is important for the livelihood of fish very much. Natural water.Good quality often DO is about 5-7 ppm if the waste water contains less than 3 ppm, but DO water quality standards that make fish and aquatic life is not less than 2 ppm. oxygen is dissolved very little. If the water temperature is higher, and DO.Quickly if there are organic compounds in water sources.2.4 b o d (BOD) An analysis of the predicted BOD (Bio-chemical demand oxygen) is an analysis of waste water of impurities in the form of oxygen that is.Microorganisms are used to degrade organic compounds. The type of compostable under extreme conditions.With the oxygen from this microorganism biochemical process to get power to.To grow and divide them further. The final product of oxidizedOrganic compounds to give carbon dioxide Water or ammonia.Organic contamination in water. If the value of BOD in waste water that the water was high contamination.Many organic chemicals. On the other hand, if the water is low, show that BOD contamination.With a little organic chemicals2.5 c o d (COD) COD (Chemical oxygen demand), the value is measured.Dirt of the polluted water in the form of all the oxygen is used to oxidize.The thon is a substance in the water, carbon dioxide and water. Based on the principle that almost all organic compounds under extreme conditions as acid. There are no nitrogen is their a.Changed to Chennai to prepare a great The value of COD in water is always higher than the BOD.The type of organic contamination in water.2.6 kamtat chemicals and pest animals. Pesticides and animals (Pesticides), which is used widely in agriculture include a group watching the Internet service slow which decomposed hydrocarbons residues in the environment for a long time, such as the Galactic orbital group, didithi hep khlo eyes no phosphate. In addition to the toxic per pest species, per.Hot blood animals is very high "faster than the first group.2.7 (Heavy Metals), heavy metal heavy metal refers to the atomic number in the range. 23-92 are in the period 5-7 in the table, the elements and the specific gravity ranges from 5 up to status.The usual heavy metal when it is in the form of a pure element have little toxicity, but if it is in.Some compounds are dangerous pictures a lot. Heavy metals such as lead are all 68 that mercury, zinc, copper, cache ดเมี่ o Nickels steel chrome manganese cobalt, arsenic, etc. Heavy metal, with the role of the environment the most mercury PB cache ดเมี่ Yom arsenic. Humans receive heavy metals into the body, it may be due to heavy metals.Accumulate in the food chain and in the biological process. Humans may consume.To touch, directly or indirectly, or often found heavy metals contamination.In the sediments over the water because there is a sludge and the charge is negative, the most. Best heavy metal has a positive charge, so there can be an island based on better water.
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