In order to reduce the environmental pollution of laboratories, the environmental protection system of laboratories should be integrated into the design and construction of laboratories, making it an indispensable part of laboratories, which is conducive to the implementation of various laboratory environmental pollution prevention and control measures. On the premise of ensuring the experimental results, the laboratories should be non-toxic, non-polluting or low-toxic. Low-pollution reagents replace highly toxic reagents. When high toxic drugs are used in some specific tests, closed collecting barrels must be used to collect waste liquid. Green science and clean test should be carried out in an all-round way.
Dry waste gas treatment.
Dry waste gas treatment refers to the process of adsorbing a certain component or component of the mixture onto the solid surface by using unbalanced molecular gravity or chemical force existing on the solid surface when the gas mixture touches the porous solid.
Solids with adsorption effect are called adsorbents. The advantages of this method are simple equipment, convenient operation and easy automation control. However, due to the different physical and chemical properties of adsorbents, it is necessary to equip adsorbents with different physical and chemical functions for the treatment of waste gas containing different harmful substances in order to achieve good gas purification effect.
If the exhaust gas passes through the adsorbent for a short time and the content of harmful substances in the exhaust gas is too high, the purification effect of the exhaust gas will not be ideal. When the exhaust gas passes through the adsorbent medium, due to the obstruction effect of the solid medium, the power of the fan must be increased to ensure the normal wind speed of the ventilation system. Adsorbents need to be replaced or regenerated periodically to ensure the normal operation of absorption equipment.
Therefore, this method needs to invest certain costs and manpower in practical use. This method is generally used for the treatment of waste gas with relatively stable and low content of substance returned from waste gas, so as to facilitate the selection of a targeted adsorbent.
Activated carbon adsorption equipment for dry waste gas treatment is generally used. The principle is that activated carbon has many microporous and large specific surface area. Relying on molecular gravity and capillary effect, it can make solvent vapor and volatile matter adsorb on its surface.
Depending on the boiling point of different orientations, the adsorbate is precipitated by steam. When the vapor is selected as the absorptive medium, the washed organic solvent vapor and water vapor are condensed in a condenser, then enter the separating barrel and recover the organic solvent after separation.