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How to treat sewage in physical and chemical laboratory

Author: Pu film Source: Laboratory sewage treatment equipment Date: 2019-09-02 Category: News

Physico-chemical laboratory wastewater


What are the harmful elements of physical and chemical laboratory sewage


It is well known that laboratory wastewater contains various acids, alkalis, heavy metals and harmful organic substances. If these wastewaters are directly discharged into underground sewage pipes without treatment or simple treatment, they are sent to large domestic sewage treatment plants for centralized treatment. The composition is complex and the treatment is difficult, especially the heavy metals such as lead, cadmium, and chromium contained in it. The facilities of the domestic sewage treatment plant cannot do anything about it, and can only be discharged into the river to cause environmental pollution.


After heavy metals enter water or soil, they also enter the human food chain through a variety of ways. With the continuous increase of people's awareness of environmental protection and the continuous improvement of corresponding environmental protection regulations, wastewater treatment in chemical laboratories has become one of the environmental assessment projects for laboratory construction. Therefore, it is of great significance to have an economically feasible wastewater treatment method in the laboratory.


的分类可为:无机废水、有机废水和综合废水三大类。 According to the classification of chemical laboratory sewage , it can be divided into three categories: inorganic wastewater, organic wastewater and comprehensive wastewater. Inorganic wastewater contains heavy metals, lead, chromium, and fluoride. Organic wastewater mainly contains carcinogens such as phenol, benzene, base compounds, polycyclic aromatic hydrocarbons, and biphenyls. Comprehensive wastewater refers to wastewater that contains both organic pollutants and Contains inorganic pollutants, and both are high in content. Most experimental wastewater is comprehensive wastewater, and it is appropriate to treat these wastewaters due to water.


理化生实验室污水

Since the physico-chemical laboratory wastewater is various, our company will advise you on three major treatment methods.


1. Coagulation precipitation method: by compressing the surface of the microparticles, the electrochemical layer such as the reduction of interfacial potential and electrical neutralization. Agglomerates suspended matter, colloids and other flocculable substances in sewage into floc. Finally, the floc is filtered through the sedimentation equipment to achieve water clarity.


2. Semi-permeable membrane method: It refers to a general term for a membrane that allows small molecular substances to pass through but large molecular substances.


3. Reverse osmosis method: refers to the application of external pressure on the raw water side of the semi-permeable membrane that is higher than the osmotic pressure of the solution. When the raw water passes through the semi-permeable membrane, only water is allowed to pass through, and other substances cannot pass through and are trapped in the membrane. Surface process.


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