13-16 Autility in south Florida has converted its plant to sodium hypochlo- rite

Question

13-16 Autility in south Florida has converted its plant to sodium hypochlo- rite because of community complaints about the safety of using chlorine gas. The hypochlorite is delivered at a concentration of 7 percent by weight and stored in a new fiberglass tank that was installed behind the maintenance building. The plant delivers an average of 8 ML/d of water with a chlorine dose of 4 mg/L.. The storage tank is just large enough for one delivery, about 40,000 L Recently, the local halt department sampled the system and found high levels of chlorate ion. Also, periodically, especially dur- ing the summer, the utility finds that the strength of its bleach has dropped substantially. What precautions might be considered to improve the situation?

Explanation / Answer

There are many things you have consider while adding Chlorinating agent since chlorine gas in highly toxic in nature. To ensure proper maintainance of chlorine concentration, climatic conditions also play an important role. During winter season, the strength usually increases because of low temperature the release of chlorine from water decreases drastically while during summer season, with rise in temperature, the rate of decomposition of sodium hypochlorite increases.

You can also adjust the amount of chlorine in water with variation in season. This is most important step to have clean water.

the reaction is : 3NaOCl = 2NaCl + NaClO3

Moreover, since HCl is generated after decoposition also, the acidity of water should also be controlled.

it is also advisable that when the people use chlorinated water, it should be first collected in any container and then let that container be open for 10 minutes till most of the chlorine present in water escapes.

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