Laboratory wastewater poses a great threat. With the continuous expansion of enrollment in middle and high schools, the sharp increase in student numbers, economic development, and scientific research, the amount of chemical laboratory wastewater is increasing. According to the types of major pollutants contained in the wastewater, laboratory wastewater can be divided into two categories: inorganic wastewater and organic wastewater. Inorganic wastewater mainly contains heavy metals, heavy metal complexes, acids and bases, cyanides, sulfides, halide ions, and other inorganic ions; Organic wastewater contains commonly used organic solvents, organic acids, ethers, polychlorinated biphenyls, organic phosphorus compounds, phenols, petroleum, and oil substances. Compared to inorganic wastewater, organic wastewater has a wider range of pollution and poses more serious hazards. Different types of wastewater have different treatment methods and degrees due to varying pollutant compositions. The direct discharge of laboratory wastewater will inevitably cause pollution to people's domestic water and living environment. Therefore, Shandong Okunlai Technology Intelligence Co., Ltd. has developed a new type of laboratory wastewater comprehensive treatment equipment that is economical, efficient, energy-saving, environmentally friendly, and applicable, in response to the shortcomings of existing technology.

The wastewater treatment system in this laboratory includes acid alkali blending module, solution mixing module, heavy metal precipitation module, and MBR treatment module arranged in sequence. The acid alkali blending module includes a regulating tank, which is equipped with sewage pipes and grids for filtering impurities. The solution mixing module includes a solution circulation stirring unit, and the heavy metal precipitation module includes a sodium silicate feeding unit. A hair collector is installed between the acid alkali blending module and the solution mixing module; Water supply units are installed between the solution mixing module and the heavy metal precipitation module, as well as between the heavy metal precipitation module and the MBR module.

By using this treatment equipment, when wastewater is generated in the laboratory, it can be discharged through the sewage pipe. The sewage pipe discharges the wastewater into the regulating tank, and the waste water is added in batches to the regulating tank. Before discharging the wastewater into the regulating tank, it will undergo a simple filtration treatment through a grid to remove impurities from the wastewater. In the regulating tank, the wastewater can first undergo neutral treatment, and the acid-base blending module can balance the acidity and alkalinity of the wastewater. Acidic or alkaline solutions are poured into the wastewater in the regulating tank, and the wastewater is transported from the regulating tank to the solution mixing module. In the solution mixing module, the solution circulation stirring unit can fully mix the acidic or alkaline solutions in the wastewater with the wastewater. After mixing from the solution mixing module, it is sufficient, The wastewater is transported to the heavy metal precipitation module under the action of the water delivery unit. At this time, the sodium silicate injection unit is activated to inject sodium silicate into the wastewater. Sodium silicate hydrolyzes and produces alternating silicic acid, which can cause heavy metals in the wastewater to precipitate. Finally, the wastewater is purified by the MBR module for water quality.

By adopting the above technical solution, when the sewage pipe discharges sewage into the regulating tank, the height of the solution in the regulating tank constantly changes with the continuous discharge of the sewage pipe. When the liquid level of the wastewater reaches the height of the first liquid level sensor, the first liquid level sensor controls the first solenoid valve and the second solenoid valve to open. At this time, due to the opening of the first solenoid valve and the second solenoid valve, the acidic solvent box and the alkaline solvent box transport acidic and alkaline solvents into the regulating tank.

This device has the following beneficial effects: when wastewater is generated in the laboratory, it can be discharged through the sewage pipe. The sewage pipe discharges the wastewater into the regulating tank, and the waste water is added in batches to the regulating tank. Before discharging the wastewater into the regulating tank, it will undergo a simple filtration treatment through a grid to remove impurities from the wastewater. In the regulating tank, the wastewater can be first treated with neutral treatment. The acid-base blending module can balance the acidity and alkalinity of the wastewater. Acidic or alkaline solutions are poured into the wastewater in the regulating tank, and the wastewater is transported from the regulating tank to the solution mixing module. In the solution mixing module, the solution circulation stirring unit can fully mix the acidic or alkaline solutions in the wastewater with the wastewater. After mixing from the solution mixing module, it is sufficient, The wastewater is transported to the heavy metal precipitation module under the action of the water delivery unit. At this time, the sodium silicate injection unit is activated to inject sodium silicate into the wastewater. Sodium silicate hydrolyzes and produces alternating silicic acid, which can cause heavy metals in the wastewater to precipitate. Finally, the wastewater is purified by the MBR module. This scheme first removes impurities in the wastewater in the grid, which facilitates the subsequent removal of chemical impurities in the wastewater. The wastewater is then mixed into a neutral solution in the acid-base bonding module to avoid corrosion of the MBR membrane structure in the MBR treatment module due to strong acidity or alkalinity in the wastewater, and also to avoid other chemical reactions between the strong acidic or alkaline solution and sodium silicate powder. The mixture is poured into the acid-base mixing module for mixing. acid-base solvents, Although acid-base solvents will eventually mix thoroughly with wastewater in the regulating tank, the diffusion of molecules in the liquid requires a certain amount of time. Therefore, the solution circulation stirring unit in the solution tank can accelerate the thorough mixing of acid-base solutions in the wastewater. After mixing the wastewater into a neutral solution, the wastewater no longer has strong acidity or alkalinity. Sodium silicate powder is added to the sedimentation tank, and when sodium silicate meets water, it produces silicate colloids. According to the coagulation and sedimentation effect of colloids, heavy metals in the wastewater can be carried into the bottom of the sedimentation tank. Finally, harmful bacteria in the wastewater are cleaned in the MBR treatment module, and the treatment effect is stable without causing secondary pollution.