Wastewater discharged from fine and pharmaceutical chemical industries has the characteristics of high concentration, high toxicity and difficult biodegradation, which is recognized as one of the most difficult wastewater in the field of environmental protection. Advanced oxidation technology, which appeared in the late 1980s, is an effective method to treat toxic, high concentration and difficult biodegradation organic wastewater. It can completely oxidize organic pollutants into harmless end products such as CO2 and H2O. Claw type dry pump system, which can provide clean vacuum source, is widely used in vacuum distillation and vacuum drying. Due to the structural characteristics of this type of equipment, it is necessary to pay close attention to the combination of user requirements and equipment performance in equipment selection, installation and maintenance.
China is a country with serious water shortage. Water pollution makes water shortage worse. As we all know, the chemical industry is a big consumer of water resources and one of the major waste water emitters. In 2006, the chemical industry ranked second and third in the discharge of wastewater and chemical oxygen demand (COD) in 39 industries. Fine and pharmaceutical chemical industry is one of the key industries in the field of chemical industry, but at the same time, it is also one of the industries with high material and energy consumption and heavy pollution.
How to improve the treatment efficiency of toxic, harmful and refractory organic wastewater and reduce the treatment cost is very important for fine and pharmaceutical chemical enterprises to effectively complete the task of reducing chemical oxygen demand. In recent years, with the development of equipment manufacturing technology and the improvement of machining ability, the reliability of domestic claw type dry vacuum pump vacuum unit has been greatly improved and its operation is stable. Its most significant feature is that it can help the production line to obtain different levels of vacuum conditions in a clean way, so as to achieve clean production, so it is widely used in chemical industry, chemical pharmacy, environmental engineering and other fields.
Obvious advantages of dry vacuum unit in replacing traditional liquid ring vacuum pump and piston vacuum pump
Using dry vacuum unit to replace traditional liquid ring vacuum pump and piston vacuum pump has obvious advantages in economic and environmental benefits. This paper introduces the application of claw vacuum unit. There are two working conditions in the factory, one is vacuum drying of drugs, the other is vacuum distillation of synthesis process. The working process of the vacuum system is shown in the figure. The system includes a claw type vacuum pump, a Roots vacuum pump, a vacuum buffer tank, a solvent receiving tank and a washing liquid storage tank. The tail gas condensate can be recovered. The PLC automatic cleaning and operation control cabinet with various parameters can be set to realize automatic operation.
Wastewater discharged from fine and pharmaceutical chemical industries has the characteristics of high concentration, high toxicity and difficult biodegradation. The superposition of “high concentration” and “toxic, harmful” or “difficult to degrade” two major characteristics makes it impossible to use biological method alone to treat such wastewater. Therefore, using some clean vacuum equipment is also one of the important ways for fine and pharmaceutical chemical enterprises to complete the task of reducing chemical oxygen demand (COD) during the Eleventh Five Year Plan period. This paper is a brief description of the user requirements of the claw vacuum pump system, which can not represent the operating characteristics of the claw vacuum pump under other working conditions.
The solvent can be recovered from the vacuum pump without pollution. The energy-saving and environmental protection benefits of roots pump are considerable. It is believed that the performance and reliability of the claw type dry pump unit will be further improved by increasing technical exchanges and communication between equipment manufacturers and users, which will provide a better engineering and technical solution for cleaner production and environmental protection.
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