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Laboratory waste liquid treatment

Incineration method

Put the waste liquid of flammable substances into a combustion furnace for combustion. If the quantity is small, put it in an iron or porcelain container and choose a safe place to burn it outdoors. When igniting, take a long stick and tie an end with oily rags, or use wood chips and other things to stand in the upwind direction for ignition and combustion. In addition, it must be monitored until it is burned out.

For a substance that is difficult to burn, it can be mixed with a combustible substance and burned, or it can be sprayed into an incinerator equipped with a burner to burn. Attention should be paid to difficult-to-burn substances such as PCBs, which often emit a part of the unburned substances. This method can also be used for incineration of high-concentration organic waste liquid containing water.

NO2 SO2 HCl 之类有害气体的废液,必须用配备有洗涤器的焚烧炉燃烧。The waste liquid that produces harmful gases such as NO2 SO2 or HCl due to combustion must be burned in an incinerator equipped with a scrubber. At this time, the combustion exhaust gas must be washed with lye to remove the harmful gas therein.

For solid materials, it can be dissolved in a flammable solvent and then burned.

2. Solvent extraction method

The low-concentration waste liquid containing water is extracted with a volatile solvent such as n-hexane, which is immiscible with water. After separating the solvent layer, it is incinerated. Then, the solvent in the water layer was blown out by blowing air.

Waste liquids such as emulsions cannot be treated by this method, but by incineration.

3. Adsorption method

Activated carbon diatomite alumina layer sheet fabric polypropylene polyester sheet urethane foam plastic straw and sawdust and other substances that can absorb the solvent well make it fully adsorbed and burned with the adsorbent.


4. Oxidative decomposition method

H2O2 KMnO4 NaOCl H2SO4+HNO3 HNO3+HClO4 H2SO4+HClO4 及废铬酸混合液等物质,将其氧化分解。 In the aqueous low-concentration organic waste liquid, H2O2 KMnO4 NaOCl H2SO4 + HNO3 HNO3 + HClO4 H2SO4 + HClO4 and waste chromic acid mixed liquid are used to decompose the waste liquid . Then, it is processed according to the above-mentioned treatment method of the inorganic experimental waste liquid.

5. Hydrolysis

在室温或加热下进行水解。 For the organic or inorganic acid esters, and some organic phosphorus compounds that are prone to hydrolysis, sodium hydroxide or calcium hydroxide can be added to hydrolyze at room temperature or under heating. After the hydrolysis, if the waste liquid is not poisonous, it can be discharged after neutralizing and diluting it. If it contains harmful substances, dispose of them by appropriate methods such as adsorption.

6. Biochemical treatment

Treat with activated sludge and blow in air. For example, dilute solutions containing ethanol, acetic acid, animal and vegetable fats and oils, protein, starch, etc. can be processed by this method.

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