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Development of Cooperative Disposal of Dangerous Waste in Ce

Date:2019-05-16 15:44     writer:admin     Views:

  Recent "Waste Clearance Action 2018" organized by the Ministry of Ecology and Environment involves 11 provinces and municipalities. 2796 solid waste storage sites have been verified on site. 1308 problems have been found, and these problems have been listed for supervision. This shows that the state attaches great importance to solid waste compared with before.

  In the way of solid waste disposal, the synergistic disposal of cement kiln has attracted wide attention recently. It is a new waste disposal method. At present, it can adapt to about 60% kinds of hazardous waste and has a wide range of applications. It can deal with hazardous waste, domestic waste, industrial solid waste, sludge and polluted soil. The development trend of synergistic disposal of cement kiln is inevitable, and it can be used as solid waste disposal and danger. An important supplement to waste disposal.

  The main principle is to use high temperature cement calcination kiln to treat solid waste and dangerous waste. The temperature of cement kiln can reach 1400-1600 degrees Celsius. The kiln presents alkaline environment and effectively avoids the volatilization of acidic substances and heavy metals. In such an incineration environment, dioxins are difficult to form and organic substances are thoroughly separated. It is harmless.

  At the same time, the heat energy generated by cement kiln calcination can be recovered. Residues and fly ash as cement components enter cement waste products. All harmful substances can be solidified and melted in the crystal lattice of cement clinker and can not escape or precipitate. Finally, resource utilization and waste reduction can be realized. Compared with other solid waste treatment methods, cement kiln disposal is more thorough and will not produce secondary pollution.

  General Technology for Cooperative Disposal of Dangerous Waste in Cement Kiln

  Cooperative disposal technology of cement kiln has a long history, which originated in the 1970s. In 1974, Lawrence Cement Works in Canada first carried out research on the solidification of hazardous wastes such as alternative fuels and fly ash from garbage. Since then, relevant research has been carried out in developed countries in Europe and the United States.

  After more than 40 years of development, the cooperative disposal technology of cement kiln is relatively mature, and has already become a widely used disposal technology in developed countries, which provides a broad market space for the sustainable development of cement industry and solid waste disposal.

  Cement kiln has high incineration temperature, long incineration time, complete disposal guarantee, no need for secondary treatment, and high acceptance capacity. It is recognized as the safest and most thorough industrial kiln in the treatment process. About two-thirds of cement plants in developed countries can carry out co-incineration disposal.

  Emission Limits of Atmospheric Pollutants from Cement Kiln Incineration Wastes (Standard State) (mg/m3) in EU and US Standards

  The cooperative disposal of hazardous wastes in cement kilns in China started relatively late, but developed rapidly. As of September 2017, the production capacity of the cooperative disposal of hazardous wastes in cement kilns reached 1.79 million tons.

  In the 1990s, China began to study the technology of cement kiln cooperative disposal, and actively attempted in the field of cement kiln cooperative disposal, and achieved remarkable results. Relevant technical systems and policy specifications were established, and the first project of cement kiln cooperative disposal was completed in 2005.

  Development History of Cement Kiln Cooperative Disposal in China

  In 2006, the National Development and Reform Commission promulgated the Policy for the Development of Cement Industry, encouraging large cement factories to dispose of solid waste synergistically. Cement factories are regarded as solid waste treatment and comprehensive utilization enterprises. Later, the state issued "Standards for Pollution Control of Solid Waste in Cooperative Disposal of Cement Kilns" (GB30485-2013), "Technical Specifications for Environmental Protection of Solid Waste in Cooperative Disposal of Cement Kilns" (HJ662-2013), "Standards for Emission of Air Pollutants in Cement Industry" (GB4915-2013), "Standards for Emission of Pollutants in Lead and Zinc Industries", and gradually formed a standard system for the coordinated disposal of Ce

  Policies on Cooperative Disposal of Cement Kilns

  China's cement kiln cooperative disposal of hazardous wastes develops relatively slowly. The reasons are as follows: cement enterprises have good self-benefits, and the economic benefits of cooperative disposal of hazardous wastes are not obvious. In addition, the lack of technology and guidance in national policy, there is a risk in cross-border operation of cement enterprises. But after 2014, with the reasons of policies, regulations and production restriction of cement, the cement kiln cooperative disposal of hazardous wastes has entered a rapid stage. Development period.

  In recent years, the frequent haze weather restricts the production of cement kilns, especially during the winter heating period in North China. In principle, cement factories cannot produce cement kilns, but excluding those with coordinated disposal. This policy has great attraction to cement enterprises. During the heating period of up to three months, cement kiln cooperative disposal enterprises can continue to produce without policy restrictions. In 2014-2016, cement kiln cooperative disposal market will be free from policy restrictions. By the end of 2014, 16 cement enterprises had obtained hazardous waste management licenses, with annual approved disposal capacity of 1034,000 tons, actual disposal capacity of 526,000 tons, utilization rate of 50.9%, and more than 1 million tons in mid-2016.

  Data show that there are more than 4000 cement enterprises in China, 30 of which have the qualification of coordinative disposal of hazardous wastes by cement kilns. By mid-2017, China has obtained the permit to deal with hazardous wastes by coordinative disposal of about 200 tons of hazardous wastes by cement kilns.

  With the vigorous development of cement kiln cooperative disposal, the management of cement kiln cooperative disposal has become more and more standardized, and the industry has entered a stable period of development.

  According to the requirements of "Guidelines for the Examination of Permits for Cooperative Disposal of Dangerous Waste in Cement Kilns (Trial Implementation)", only large-scale cement kilns with more than 4000 tons can be approved by EIA. In addition, when the capacity of hazardous waste disposal is strictly planned and the disposal capacity reaches a certain level, the licenses for hazardous waste will be delayed or suspended, which limits the participation of cement kilns in cooperative disposal, as well as geographical and neighborhood avoidance. For other reasons, it also affects the cement kiln to participate in the cooperative disposal.

  There are 1770 new dry-process cement kiln production lines in China. According to the latest policy, except for the scale limitation, it is estimated that more than 200 new dry-process cement kiln production lines meet the requirements of transformation.

  At present, 31 production lines are involved in the projects put into operation, accounting for 1.7% of all production lines, 60% of 4000t/d and above, and 2.6% of the whole country. Although eight enterprises have been approved in Shaanxi, only two of them are dealing with hazardous wastes, or 185,000 tons. At present, there are 15 provinces and municipalities that have not put into operation cement kiln cooperative disposal facilities.

  From the future trend analysis, with the further development of the industry, China has a very mature mode, which is conducive to the rapid spread of the cooperative disposal of hazardous wastes in cement kilns. There are three operation modes, namely, decentralized joint operation mode, decentralized independent operation mode and centralized operation mode.

  Operation Mode of Cooperative Disposal of Dangerous Waste in Cement Kiln

  At present, the cooperative disposal of cement kilns is dominated by cement factories and belongs to centralized management mode. However, in the future, enterprises with technical and operational experience are expected to play a key role in the industry, and will spread out in a decentralized joint operation mode and a decentralized independent operation mode, so as to rapidly improve production capacity.

  Organizations predict that the market space of cement kiln reconstruction and construction end is expected to reach 34 billion yuan, the market scale of cement kiln cooperative disposal of hazardous waste operation end is 70 billion yuan, and the market space of operation end is estimated to be 40 billion yuan. From the production capacity of cement kiln cooperative disposal, 18 million tons of market space will be developed. This part of disposal capacity may gradually land in the past five years.

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