What is breakpoint chlorination?
Breakpoint chlorination is a technique used to remove combined chlorine by adding free available chlorine. To reach breakpoint, sufficient chlorine must be added to the pool to raise the free available chlorine level to 10 times the amount of combined chlorine.
How many stages are there in breakpoint chlorination?
The basic process of breakpoint chlorination is that chlorine reacts with ammonia in four different stages to ultimately produce nitrogen gas, hydrogen ions, chloride ions, and possibly some nitrous oxide, and some nitrate, as shown in equations 7-8 through 7-12.
What are the advantages of breakpoint chlorination?
(1) It oxidizes complete organic matters, dissolved ammonia and other reducing particles. (2) It removes color (which is due to the presence of organic compounds). (3) It destroys (~ 100%) all the bacterias. (4) It removes bad odour and bad taste.
How do you calculate breakpoint in chlorine?
The formula for breakpoint chlorination using LIQUID chlorine (sodium hypochlorite): Volume of the pool in gallons, times 8.3 (weight of one cubic ft. water), times the combined chlorine level (total chlorine minus the free available chlorine) times 1.0 (lbs.
What is breakpoint chlorination and under what condition is it advocated?
Breakpoint chlorination is defined as the point where enough chlorine has been added to a quantity of water to satisfy its disinfecting demand. In other words, it is the point where all undesirable contaminants have been removed from the water.
What are the types of chlorination?
Types. The different types of chlorine disinfection are batch disinfection, simple chlorination, super-chlorination followed by dechlorination, and shock chlorination. They vary in the amount of chlorine used.
What is breakpoint curve?
The breakpoint curve is a graphical representation of chemical relationship that exists with constant addition of chlorine to swimming pool water containing a small amount of ammonia-nitrogen. This graph represents a swimming pool where bathing has ceased and no further ammonia-nitrogen is introduced into the pool.
How do you calculate breakpoint?
A ‘natural’ breakpoint reflects the amount of Gross Sales which, when multiplied by the Overage Percentage, equals Base Rent (stated differently, a natural breakpoint is calculated as Base Rent divided by the Overage Percentage). The Overage Percentage is stated in the lease.
Why does the chlorine demand curve have a breakpoint?
Breakpoint chlorination is the point where chlorine levels exceed the oxidant demand, and the water begins to build a residual of free available chlorine (FAC). Theoretically, exceeding the “breakpoint” prevents increased levels of disinfectant byproducts (like chloramines).
What is the mechanism of chlorination?
General mechanism The chain mechanism is as follows, using the chlorination of methane as a typical example: 1. Initiation: Splitting or homolysis of a chlorine molecule to form two chlorine atoms, initiated by ultraviolet radiation . A chlorine atom has an unpaired electron and acts as a free radical.
What is the process of chlorination?
What is chlorination? Chlorination is the process of adding chlorine to drinking water to kill parasites, bacteria, and viruses. Different processes can be used to achieve safe levels of chlorine in drinking water.