Laboratory waste pretreatment and recovery methods

1, recycling The large amount of organic waste liquid produced in the experiment can be recovered by distillation, and can be reused under the premise of meeting the requirements; some precious metals can be recovered by precipitation, crystallization, adsorption, ion exchange, etc.; The cooling water can be cooled and reused. 2, dilution method Laboratory waste, such as certain heavy metals, flammable organic solvents that are soluble in water, etc., can be discharged into sewers with appropriate dilution. The specific requirements are discharged according to the GB 8978 comprehensive wastewater discharge standard. 3. Neutralization method Strong acid and strong base laboratory wastes can be carefully neutralized to the proper pH and discharged directly. If the neutralized waste contains other harmful substances, further treatment is required. 4, oxidation method Compounds such as sulfides, cyanides, aldehydes, mercaptans, and phenols can be oxidized to low-toxicity and low-odor compounds. 5, restore method Oxide sulfites, peroxides, many organic drugs and heavy metal solutions can be reduced to low toxic substances. The waste liquid containing hexavalent chromium can be reduced to trivalent chromium by reducing agents such as acid and ferrous sulfate. After the mercury, lead, and silver in the waste liquid are reduced, they can be precipitated and filtered. Organic lead can also be removed by similar methods. The treated concentrate is collected and placed in a container and sent to a designated place for disposal.

Laboratory waste treatment methods 1、Dumpster For those inert solid wastes that are suitable for public health waste disposal and will not cause any harm to the treatment personnel, they can be directly trashed but they must be in compliance with the relevant provisions of the "Law of the People's Republic of China on the Prevention and Control of Environmental Pollution Caused by Solid Wastes." 2. Sewage discharge The safe and harmless laboratory waste treated by the above pretreatment method meets the emission requirements of relevant environmental laws and regulations and can be discharged directly through the sewer. 3, Incineration, solvent recovery Waste organic solvents that are free of solids, corrosive, or possibly chemically reactive substances should be classified, collected, or burned in a boiler room or power station. 4, laboratory packaging A small amount of liquid or solid laboratory waste is classified according to poisons, oxidants, combustibles, corrosive acids, and corrosive bases, then collected in double-layer sealed tanks and sent to a designated safe place or specified trash. Field processing. 5, curing In a metal can lined with an open upper end, a compatible curing agent (eg, frog rock, diatomaceous earth, or mud, etc.) is added to the appropriately pretreated liquid laboratory waste. Carefully sealed containers should be carefully sealed and properly labeled. 6, waste exchange   Unnecessary pharmaceuticals or effluents from a laboratory are not completely useless to other laboratories, and there is an effective exchange of information. And determine the classification principle, can be exchanged and reused.