Collection and classification of INORGANIC liquid waste from experimental facilities                 

 

Class

Group/Contents

Container

Remarks

1

MERCURY and MERCURY COMPOUNDS

Inorganic mercury compounds

Organic mercury compounds

(Acidification)

Gray   16L

Wash the emptied vessel which contained the liquid wastes at least thrice, store the washing with the wastes at pH< 2.

Filter off any precipitate ¨Store the precipitate as gmercury sludgeh in other sealed vessel.

EOrganic mercury compounds ; Decompose organic compounds (see note 1). (>3% organic compounds)

EMercury metals and mercury amalgam ; Add water and store in other sealed vessel.

2

ACID, CHROMIUM and HEAVY METALS

Bismuth, copper, cobalt, chromium, cadmium, iron, lead, manganese, nickel, silver, tin, zinc, etc. and their salts

Mineral acid waste solutions, such as hydrochloric acid, sulfuric acid, nitric acid, etc.

 

(Acidification)

Red   16L

Wash the emptied vessel which contained the liquid wastes at least thrice, store the washing with the wastes at pH< 4.

Filter off any precipitate ¨Store the precipitate as gnon-mercury sludgeh in other sealed vessel.

ELiquid wastes of less than 5% sulphuric acid or hydrochloric acid without harmful compounds could be carefully 

   disposed off after neutralization (pH 5-9).

EHexavalent chromium ; Store the liquid wastes after ensuring the concentration below 50 ppm of Cr(VI). (see note 2)

EMercury compounds ; Store the liquid wastes after ensuring the concentration below 10 ppb of mercury.

ECyanide and their compounds ; Store the liquid wastes after ensuring the concentration below 1 ppm of cyanide.

3

CYANIDE and  ARSENIC COMPOUNDS

Cyanide compounds, cyanide complex compounds, arsenic, selenium compounds

(Alkaline condition)

Orange 16L

Wash the emptied vessel which contained the liquid wastes at least thrice, store the washing with the wastes at pH>9.

Filter off any precipitate ¨Store the precipitate as gnon-mercury sludgeh in other sealed vessel.

ECyanide and their compounds ; Store the liquid wastes after ensuring the concentration below 80 ppm of cyanide. (see note 6)

EArsenic and their compounds ; Store the liquid wastes after ensuring the concentration below 20 ppm of arsenic. (see note 7)

ESelenium and their compounds ; Store the liquid wastes after ensuring the concentration below 12.5 ppm of    selenium. (see note 8)

4

ALKALINE SOLUTIONS

Potassium hydroxide, sodium hydroxide, sodium carbonate, potassium carbonate, ammonium compound, alkaline solutions containing heavy metals, etc.

Blue   16L

Wash the emptied vessel which contained the liquid wastes at least thrice, store the washing with the wastes.

Filter off any precipitate ¨Store the precipitate as gnon-mercury sludgeh in other sealed vessel.

ELiquid wastes of less than 5 % sodium hydroxide, potassium hydroxide or their salts without harmful compounds

   could be carefully disposed off, after neutralization (pH 5-9).

EMercury compounds ; Store the liquid wastes after ensuring the concentration below 10 ppb of mercury.

ECyanide and their compounds ; Store the liquid wastes after ensuring the concentration below 1 ppm of cyanide.

 

Do not store in container

 

Over 3 % organic compounds (contained cheating reagent); Decompose organic compounds. (see note 5)

Waterless compounds (alkali metals, carbide, etc.) and ignitable compounds (organic lithium, organic aluminum, etc.)

Over 0.5 % of Inorganic fluoride and over 300 ppm of phosphate. (see note 3,4)

Over 200 ppm of Boron

Nitrate, nitrite, ammonium ; Over 7,600 ppm of total nitrogen.

Osmium, thallium and beryllium and their compounds ; they should be carefully stored at the user's laboratory.

Radioactive wastes

 

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