Activated carbon

Activated carbon is a hydrophobic adsorbent made from carbon containing materials as raw materials through high-temperature carbonization and activation. Activated carbon contains a large number of micropores and has a huge specific surface area, which can clean up discoloration, odor, most organic pollutants and some inorganic substances in secondary effluent, including some toxic heavy metals. The factors affecting the adsorption of activated carbon are: the characteristics of activated carbon; Characteristics and concentration of adsorbed substances; PH value of wastewater; Suspended solids content and other characteristics; Contact system and operation mode, etc. Activated carbon adsorption is an important treatment technology in the high-grade treatment of urban sewage, and has been widely used. Activated carbon can adsorb chlorinated hydrocarbons, organic phosphorus and carbamate pesticides, as well as phenyl ether, n-nitrochlorobenzene, naphthalene, ethylene, xylenol, phenol, DDT, aldrin, alkylbenzene sulfonic acid and many esters and aromatic compounds. The secondary effluent also contains organics that are not adsorbed by activated carbon, such as the intermediate degradation substances of protein, which are more difficult to be adsorbed by activated carbon than the original organics. The ability of activated carbon to remove THMS is low, only 23-60%. The activated carbon adsorption method is combined with other treatment methods, including ozone activated carbon method, coagulation adsorption activated carbon method, Habberer process, activated carbon diatomite method, etc., which significantly prolongs the adsorption period of activated carbon, reduces the amount of activated carbon, and greatly improves the treatment effect and scope.

The wooden activated carbon processed with "three residues of forest products" as raw materials is an important forest chemical product in China. According to the 2013-2017 Forecast and Analysis Report on Market Research and Smart Selection of China's Activated Carbon Industry, in 2010, China's total annual output of wooden activated carbon was about 134000 tons, ranking first in the world. Its production enterprises and capacity were mainly concentrated in Jiangxi, Fujian and Zhejiang provinces, with an annual output of about 100000 tons. Among them, Jiangxi Province has more than 100 activated carbon production enterprises, mainly producing wooden activated carbon from wood chips and bamboo chips, which is the largest production province of wooden activated carbon in China; There are nearly 10000 employees in the activated carbon industry in the province, mainly distributed in Shangrao, Yichun, Ganzhou, Fuzhou, Ji'an and other places, and most of them are local forest farmers. Foresight said that the demand for wooden activated carbon in China and even the world is growing rapidly, with huge potential.

Since 2010, the global consumption of activated carbon has continued to grow rapidly. In 2012, the global total consumption reached 1.2 million tons, and the total market volume exceeded 1.5 billion dollars, with huge development potential. In terms of traditional demand, it is estimated that the global total demand for wooden activated carbon will be about 600000 tons in 2015, and the domestic production will contribute about half; In terms of potential demand, the future global industrial environmental protection (mercury emissions, etc.), home/automobile environmental protection (formaldehyde, odor, etc.), tap water purification, food and beverage refining and other fields will likely make the demand for wooden activated carbon explode. Although the activated carbon industry in China has developed rapidly, some factors restricting the development of the industry have existed for a long time. For example, the scale of activated carbon enterprises in China is generally small, and it is difficult to form economies of scale, technology is backward, and environmental pollution is serious. Only relying on the advantages of China's coal resources, it can survive in fierce competition from time to time, but it is difficult to have great development, It is also difficult to compete with foreign large activated carbon enterprises. In order to change the situation that the production process of activated carbon carbonization material in Datong is backward and the environment is seriously polluted; Reasonably adjust the industrial structure of Datong activated carbon, and produce high-technology, high-value and high-grade activated carbon products.