Experiment of Centrifugal Separation of Wastewater by Centrifuge
The principle of centrifugal sedimentation separation is to use the characteristics of different sedimentation speed of suspension or solid particles in liquid, and to quickly settle and stratify under the action of centrifugal force field to achieve liquid-solid separation. An important indicator of the separation performance of a centrifugal separator is the separation factor, which represents the ratio of the centrifugal force to the gravity of the separated material in the drum. The larger the separation factor, the faster the separation is usually and the better the separation effect.
In the laboratory, we used an electric centrifuge with a speed of 4000 r/min and a radius of revolution of 0.1 m and a separation factor of 2000 to separate the mycelial wastewater. Take the mycelial wastewater (SS value of 20000mg / L) into a centrifuge tube, placed in a centrifuge, turn on the power, shut down after 40S operation, determine the SS concentration of the centrifuged clear solution; take the same concentration of mycelial wastewater into the station The flocculant is selected to achieve the flocculation effect in the water concentration, and the experiment is carried out in the same operation after stirring, and the concentration of the SS in the centrifuge liquid is measured.
This experiment uses a centrifuge with a separation factor of 2000. The experimental results show that it is feasible to treat the mycelial wastewater with a centrifuge. As long as the separation factor is sufficient or the flocculant is added, the hyphae wastewater can be treated directly by centrifugation to achieve the standard discharge. . The effect of adding flocculant during the experiment is due to the presence of fine hyphae wastewater and other impurities in the wastewater. It is difficult to aggregate into large particles due to homosexual repelling, and it is very difficult to form sediment by its own weight, thus forming a relatively stable suspension. The turbid liquid can absorb the charge on the surface of the particles by the chemical agent opposite to the suspended particles, so that the surface potential is reduced, and the stable state of the colloidal particles is destroyed to cause aggregation to accelerate the sedimentation. Therefore, we chose a certain type of polyacrylamide that can be used under alkaline conditions as a flocculant.
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