The main components of hard water


   so-called "hard water" refers to water contains more minerals, the main component of hard water are what it? Let Xiaobian a look at it.




hard water does not pose a direct health hazard, but life will bring a lot of trouble, such as the water apparatus guitar scale, efficiency washing soap and detergent to reduce, etc., then you must soften hard water ? The answer is that there must be no softening of the best real hard to soften the impact if safe to do so, otherwise you can use directly, lets take a hard look at what are the main component of it?


Hard water is mainly composed of Mg (HCO3) 2 and Ca (HCO3) 2 composition, after heating these two minerals into Mg (OH) 2 and CaCO3, so that the hard water into soft water can be heated. Let Xiaobian to introduce five hard on how to become a software wet bar.


1, a boiling method (only for temporary hard water) reaction upon boiling temporarily hard water: Ca (HCO3) 2 = CaCO3 鈫?+ H2O + CO2 鈫?Mg (HCO3) 2 = MgCO3 鈫?+ H2O + CO2 鈫?the insoluble, CaCO3, MgCO3 sparingly soluble, it can also generate magnesium carbonate under heated conditions to further reaction with more water soluble magnesium hydroxide: MgCO3 + H2O = Mg (OH) 2 鈫?+ CO2 鈫?thus the main scale component is CaCO3 and Mg (OH) 2.


2, lime - soda method (for industrial use) In this method, lime is added temporary hardness can be completely eliminated, HCO3-are converted into CO32-. Hardness permanent hardness under the effect of magnesium lime and the like will be converted into an amount of calcium substance, and finally removed. During the reaction, the magnesium is precipitated as magnesium hydroxide, and the calcium is precipitated as calcium carbonate. Ca2 + (aq) - Lime - soda -> CaCO3 (s) Mg2 + (aq) - Lime - soda -> Mg (OH) 2 (s)


3, this ion exchange method ion exchangers used in the method, there are both inorganic and organic. Inorganic ion exchangers such as zeolites and the like; organic ion exchanger comprising: a carbonaceous ion exchangers - sulfonated enzyme, anion and cation exchange resins. And generally in the ion exchangerAfter the failure may also be regenerated. Water hardness (also called salinity) refers to the number of calcium and magnesium salts dissolved in the water content. High content of hardness, otherwise small. 1 liter of water containing 10mmgCaO (or equivalent 10mmgCaO) is called a degree. Water is soft water hardness of less than 8, such as rain, snow, and purified water; water hardness of greater than 8 is hard water, such as mineral water, tap water, surface water, and nature and groundwater.


Domestic water Tips: According to the US the WQA (Water Quality Association) standards, hardness of the water is divided into 6: 0 ~ 0.5GPG soft water, 0.5 ~ 3.5GPG as micro-hard, 3.5 ~ 7.0GPG as in hard, 7.0 ~ 10.5GPG hard water, 10.5 ~ 14.0GPG is very hard, 14.0GPG above are very hard. In Shanghai, for example, most parts of the domestic water tap water after each water purification treatment, a hardness in the range of 8 ~ 14GPG, according to the standard belonging WQA hard or hard range.




Editor: Zhang Fu

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