Chlorine is commonly used as an antiseptic and is used to make drinking water safe and to treat swimming pools. Large amounts of chlorine are used in many industrial processes, such as in the production of paper products, plastics, dyes, textiles, medicines, antiseptics, insecticides, solvents and paints.
Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is highly toxic.
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. Batch disinfection treats water in batches when the chlorine demand fluctuates.
Chlorine kills pathogens such as bacteria and viruses by breaking the chemical bonds in their molecules. Disinfectants that are used for this purpose consist of chlorine compounds which can exchange atoms with other compounds, such as enzymes in bacteria and other cells. The oxygen atom is a powerful disinfectant.
The simplest way to remove chlorine is to simply let it evaporate from the water. Chlorine is a gas at room temperature, and in water it's a "volatile solute" meaning its molecules are diffused in the water, and it will escape into the air over time. Heating or boiling the water will speed the process.
The benefits of chlorination are:
Proven reduction of most bacteria and viruses in water. Residual protection against recontamination. Ease-of-use and acceptability. Proven reduction of diarrheal disease incidence.Halogenation is a reaction that occurs when one or more halogens are added to a substance. Halogens comprise the seventh column in the periodic table and include fluorine, chlorine, bromine, iodine, and astatine. The resulting product of a halogenation reaction is known as a halogenated compound.
Chlorine dissolves in water to some extent to give a green solution. A reversible reaction takes place to produce a mixture of hydrochloric acid and chloric(I) acid (hypochlorous acid).
o What to expect: As the electricity from the battery passes through and between the electrodes, the water splits into hydrogen and chlorine gas, which collect as very tiny bubbles around the electrode tips. That's because the oxygen atoms from the water combine in the liquid with the salt to form hydroxyl ions.
How it Works. On-site generation applies electricity to a solution of salt and water to produce sodium hypochlorite. A current is passed through the electrolytic cell, producing sodium hypochlorite, which is stored in another tank, then metered into the water moving through the treatment process.
Salt systems are actually chlorine generators, using a process called electrolysis. Electrolysis happens by sending electricity through salt water (sodium chloride, or NaCl), which interacts with the chloride ion in the salt. This creates chlorine in the water, and a very high-pH byproduct called sodium Hydroxide.
Preparation of 0.5% chlorine solution:
Grams/litre = [% dilute/% concentrate] x 1000. For example to make a 0.5% dilute chlorine solution from a dry powder of 35% calcium hypochlorite = [0.5%/35%] x 1000 = 14.2 g. Hence add 14.2 grams of dry powder to 1 litre of water or 142 grams to 10 litres of water.To mix chlorine bleach combine 5.25 percent sodium hypochlorite and 94.75 percent water. To mix non-chlorine bleach, combine equal parts hydrogen peroxide and water. Pour mixture into the plastic container, and secure tightly. Shake to mix ingredients.
How is Sodium Hypochlorite Made? Sodium Hypochlorite is prepared by reacting dilute caustic soda solution with liquid or gaseous chlorine, accompanied by cooling. Sodium Hypochlorite is commonly produced either through a batch process or through a continuous process.
Sodium hypochlorite can be produced in two ways: - By dissolving salt in softened water, which results in a concentrated brine solution. The solution is electrolyzed and forms a sodium hypochlorite solution in water. This solution contains 150 g active chlorine (Cl2) per liter.
Inhalation of chlorine gas or drinking highly concentrated sources of chlorine (such as household bleach) can lead to vomiting, coma, and even death. For this reason, many people fear that the chlorine in swimming pools and drinking water can be harmful for health, and cause cancer.
Stomachaches, vomiting, and diarrhea can all be effects of ingesting chlorine, and it can also cause dry, itchy skin. Furthermore, chlorine can interact with water and its minerals to produce chemicals called trihalomethanes (THMs), which have been connected to heart disease, eczema, asthma, and even cancer.
The Dangers of Chlorine in Your Drinking Water
Stomachaches, vomiting, and diarrhea can all be effects of ingesting chlorine, and it can also cause dry, itchy skin. Severe chlorine poisoning can be far worse – a significant dose of liquid chlorine can be extremely toxic and even fatal to humans.Superchlorination is a water treatment process in which the addition of excess amounts of chlorine to a water supply speed chemical reactions or insure disinfection within a short contact time.
Amount of Bleachand Water to Mix
- Mix 1 cup (240 mL) of bleach in 1 gallon of water.
- Wash surfaces with the bleach mixture.
- If surfaces are rough, scrub them with a stiff brush.
- Rinse surfaces with clean water.
- Allow to air dry.
1. Chlorine Compounds. Chlorine compounds are good disinfectants on clean surfaces, but are quickly inactivated by organic matter and thus reducing the biocidal activity. They have a broad spectrum of antimicrobial activity and are inexpensive and fast acting.
To dose water in a tank with 5 mg/L chlorine use: 40 millilitres of liquid pool chlorine or 170 millilitres of bleach, for every 1000 litres in the tank.
Chlorine will kill bacteria such as E. coli in less than a minute, but takes around 16 minutes to kill the hepatitis A virus. It needs 45 minutes to kill Giardia, and up to 10 days to kill Cryptosporidium.
Add one heaping teaspoon (approximately ¼ ounce) of high-test granular calcium hypochlorite (HTH) to two gallons of water and stir until the particles have dissolved. The mixture will produce a chlorine solution of approximately 500 milligrams per liter.
Mix a solution of household bleach and water (1 tablespoon or 15 ml of bleach for every gallon of water). tank with this solution, and leave it sit for 2 hours. 6. After 2 hours, thoroughly rinse the tank with clean water.
Sanitizing Procedure. In a clean quart container about half full of water, put 1 to 1 1/2 fluid ounces (2-3 tablespoons) of a standard unscented, non-detergent household chlorine bleach (5.25% concentration) for every 500 gallons of water to be treated. Pour the bleach solution directly into the storage tank.
6 ounces initially per 5,000 gallons and a a maintenance dose of . 75 ounces per 3,000 gallons every week.
A solution of bleach and water should be used to sanitize all food preparation and contact surfaces. 1 tablespoon of bleach per 1 gallon of water will give you a 50-200 ppm sanitizing solution.
Use regular liquid bleach containing 5.25 percent hypochlorite. Add 16 drops (about ¼ teaspoon) per gallon of water. The treated water should be mixed thoroughly and allowed to stand for 30 minutes before use. The water should have a slight bleach odor.
2 drops of Regular Clorox Bleach per quart of water 8 drops of Regular Clorox Bleach per gallon of water 1/2 teaspoon Regular Clorox Bleach per five gallons of water If water is cloudy, double the recommended dosages of Clorox Bleach.
