During the period of 2013 to 2015, the main dynamic development of Chinese desulfurization and denitration industry are:

(1) Environmental bursts "three gold medals", the especially emission limit helps the birth of "ultra low emission";

(2) Coal-fired power industry is still the focus and leading industry of electricity desulfurization and denitration, coal-fired power plants’ ultra-low emissions have formed a culture;

(3) Waste denitration catalyst will be included in the national hazardous waste management; moreover, the zero discharge of desulfurization wastewater has attracted attention, numbers of power plants have carried out zero discharge of wastewater;

(4) Desulfurization and denitration market expanded to non-electric industry, industrial boiler is the focus, steel, cement, and kiln ect. will be strengthen supervision, to encourage the industry with the capacity of using clean coal to use more coal, and also restrict the arbitrary use of coal.

 

According to the "National List of Hazardous Wastes", hazardous waste (form of solid or liquid) is as following:

1. Corrosive, toxic, flammable, reactive or infectious and other one or several hazardous characteristics;

2. Do not exclude hazardous properties, and may cause harmful effects on the environment or human health, which needs to be managed following hazardous waste.

 

Denitration catalyst is the core of SCR system, the current international widely used is taking vanadium pentoxide as the main active substance; titanium dioxide as the carrier; tungsten trioxide (or molybdenum trioxide) as an assistant, plays the role of anti-poison, anti-sulphuric, anti-sintering of the carriers; also adds the other adhesive components. In the running of tungsten trioxide denitration catalyst, due to fouling, abrasion, alkali metal poisoning, catalyst will cause deactivation, and affects the denitration activity.

 

Due to the abandoned denitration catalyst contains highly toxic of vanadium pentoxide, which will cause great harm to the environment and the human body, and belongs to the category of hazardous waste; if it is not been well handled, a huge potential harm will cause on the environment, and also cause a great waste of resources. Common treatment includes landfill, incineration and recycling, wherein recycling is the most promoted way, the comprehensive recycling can not only solve the pollution problem, but also making the recycling of resources (such as tungsten, vanadium, titanium and other metals) at the same time, therefore, its research has very practical significance.