For chemically reactive wastes, Science

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For chemically reactive wastes : The chemical property of the waste could be used in its removal in a number of ways as given below:

i) Some water-reactive waste could be disposed of by transferring it into a dry bucket, transporting to a safe area and adding a large volume of water. After completion of the reaction, the suspension could be poured into the drainage. (Example: Calcium oxide).

ii) A few solid wastes, which are highly reactive with water, could be removed by mixing with dry sand, shovelled into dry I bucket(s), transported to a safe open area and treated with large quantity of water added in small quantities at a time. After the reaction is complete, the mixture is decanted into the drainage.

(Examples: Anhydrous aluminium chloride and phthalic anhydride).

iii) Where the product of reaction with water is highly corrosive, then (ii) is to be carried out in an enamel or polythene container.

(Examples: Phosphorus pentachloride and phosphorus pentoxide).

iv) The site of spillage is to be covered with sodium carbonate liberally and then mopped cautiously with a large quantity of water. (Examples: Perchloric acid, sulphuric acid, hydrochloric acid, nitric acid, phosphoric acid, acetyl chloride, benzoyl chloride, chromium trioxide, chromyl chloride, tin (IV) chloride and bromine).

v) The spillage is mixed with sand and shovelled into a suitable glass or enamel vessel for treatment with an excess of dilute hydrochloric acid (one volume of the acid and two volumes of water) allowed to stand for 24 hours and then run into drains with a large volume of water. (Example: Aniline).

vi) Small quantities of spillage can be washed off using sodium thiosulphate or sodium metabisulphite solution. (Example: Iodine in small quantities).

vii) The waste may be mixed with dry sodium carbonate, shovelled into a dry bucket and transported to a safe open space. The mixture may be added a little at a time to a large excess of dry propan-2-01, allowed to stand for 24 hours and run into the drainage diluting greatly with running water. (Example: Sodium metal).

viii) The spillage is to be treated with excess of sodium hypochlorite solution, mopped up into a bucket, allowed to stand for 24 hours, diluted greatly with water and then run into the drainage. (Example: Potassium cyanide).


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