Application of Hangzhou activated carbon in environmental protection industry

Application of activated carbon in environmental protection industry

1、 Application characteristics of special carbon for environmental protection

The traditional water purification process, such as coagulation, sand filtration and disinfection, can not effectively remove the toxic substances such as phenol, cyanogen, chloroform and mercury in the water, while the activated carbon adsorption method has become an effective method for deep purification. The special advantages of using environmental protection activated carbon adsorption method to treat water are as follows:

(1) It has a wide range of adsorbable substances, a large adaptability in wastewater treatment, and a strong adaptability to the change of water quality, water temperature and water quantity;

(2) The organic matter in water has excellent adsorption performance, which can remove the pollutants that can not be purified by biochemical method;

(3) It can be widely used in the treatment of industrial water, domestic sewage, hospital wastewater and air purification;

Because of the advantages of special activated carbon for environmental protection, the amount of activated carbon used in water treatment is large and increasing year by year. In the mid-1980s, there were more than 30 sets of activated carbon industrial wastewater treatment plants in China, and the application of activated carbon in water treatment was more extensive in the 1990s. Chongqing Zhongshan Activated Carbon Manufacturing Co., Ltd. recently developed special carbon for environmental protection will produce a qualitative breakthrough in the field of water treatment application.

2、 Application field of special carbon for environmental protection

1. Application in the treatment of wastewater containing heavy metals

(1) The production process of treating chromium containing wastewater with environmental protection special carbon to treat chromium plating rinse water, galvanizing passivation wash water and chemical oxidation wash water has achieved the goal of comprehensive treatment of heavy metal pollution such as hexavalent chromium. The process is simple and the effect is good. It is especially suitable for electroplating water with hexavalent chromium concentration below 150mg / L.

(2) The treatment of cyanogen containing wastewater by catalytic oxidation is a new method to treat cyanogen containing wastewater by using the catalytic action of the surface oxide of active carbon and the role of catalyst carrier, that is, impregnating the surface of active substance and using oxygen (or air) as oxidant to treat cyanogen containing wastewater. This is a new method to decyanate which may replace the alkaline chlorination, and using plasma to treat the surface of active carbon The efficiency of cyanogen treatment can be increased by about 15%.

2. Application in the treatment of printing and dyeing wastewater

At home and abroad, chemical method (oxidation method, coagulation method, electrolysis method), physical chemical method (adsorption method, membrane method), biological method (bacteria feeding method, anaerobic aerobic method) are used to treat printing and dyeing wastewater. Among them, activated carbon adsorption method and its combination method are the most important methods, and the effect is also good.

3、 Application method of special carbon for environmental protection

In the process of water or air treatment, the application methods of special activated carbon for environmental protection mainly include the special activated carbon for environmental protection and its combination.

(1) Special activated carbon for environmental protection

The combination of carbon adsorption for environmental protection mainly includes aeration / carbon adsorption for environmental protection, biological treatment / carbon adsorption for environmental protection, ozone oxidation / carbon adsorption for environmental protection, etc.

(2) Separate use of special carbon adsorption method for environmental protection

It is mainly used for water deodorization and deodorization, and sand filtration can also be placed before the adsorption step of environmental protection special carbon, so that the service life of environmental protection special carbon will be prolonged and the effect will be better. When it is used to remove organic matters in water, the sand filtration can be used as the second stage, and the special carbon adsorption method for environmental protection or the special activated carbon method for biological environmental protection combined with aeration can be used as the first stage, so the water treatment effect can be improved by 20% ~ 40%. It should be emphasized that in the process of sewage treatment, the special activated carbon for environmental protection is often used as the secondary treatment, especially the tertiary treatment.