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Laboratory Sewage Treatment Equipment


At present, the sewage and wastewater discharged from university laboratories are generally not strictly treated, especially the sewage and wastewater containing various heavy metals such as dust and particles will have a great impact on the ecological environment; The water consumption of university laboratories is huge, but the test water in some links does not have high requirements for water quality. Therefore, the sewage and wastewater treatment in university laboratories can not only protect the environment, but also the recycling of sewage and wastewater plays a vital role in protecting water resources and saving water. In addition, the structure of conventional sewage treatment equipment is cumbersome and needs to be cleaned regularly. If it is used for too long, it will not only reduce the purification capacity, but also block the drainage pipe in serious cases, increase the treatment burden, resulting in a waste of human and material resources. 

Typically, for example, Chinese patent document cn2504252y discloses a laboratory sewage purifier, which comprises a square or rectangular purification box, and a plurality of purification agent layers are constructed from top to bottom in the box, so that the sewage is purified step by step. Due to the large particle size difference of heavy metal dust or particles as mentioned above, the step-by-step purification must first ensure the step-by-step separation of different impurities or other pollutants, which will inevitably lead to too many layers and complex overall structure. At the same time, the purification agent layer is limited by the adsorption capacity, the maintenance cycle is relatively short, and the sustainable working capacity is poor. 

For example, in Chinese patent document cn 202369435u, the laboratory sewage treatment equipment provided by it adopts flat membrane bioreactor, and multiple flat membrane bioreactors are connected in sequence, so that step-by-step purification can be realized. The problem that it has the same maintenance cycle compared with the previous patent document is that the purification medium of the flat membrane bioreactor needs to be replaced regularly. At the same time, each flat membrane bioreactor needs to be pumped step by step. These flat membrane bioreactors are arranged in clusters and cover a relatively large area. 

Relatively speaking, for example, Chinese patent document cn104743720a adopts the maintenance free implementation method to construct the sewage treatment device in the biological laboratory. On the one hand, it exports the sediment through sedimentation, mixes the harmful substances in the sewage through dosing, and further replaces the heavy metals in the sewage with the help of electrochemical reaction, which has relatively good maintainability. However, the export of sediment still needs to be handled in the shutdown state, and the continuous working capacity is relatively poor. 

The centrifugal separation device is used to separate the harmful components in the wastewater, and finally the heavy metals in the wastewater are replaced by replacement. Specifically, two-stage centrifugal separation is used to filter the free heavy metals and other insoluble impurities in the sewage, and then enter the last stage of electrolysis. The material separated by centrifugation, that is, the material obtained from the sieve residue, scrapes off the wedge wire  screen barrel through the blanking device and falls.  It is obvious that the falling area is located in the screen barrel and close to the screen barrel, while the diaphragm or separation device that receives the screen residue is directly received and then exported, so as to ensure continuous production. The screening part will flow down from the outside of the screen barrel without affecting the export of the screen residue. In the final electrolysis, the heavy metals and their ions in the sewage are separated by replacement. The loss of the electrode is relatively slow and easy to control. It does not need to be replaced in the working process, which can ensure continuous production.