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Ministry of Environmental Protection issued "Technical Policies for the Prevention and Control of Solid Waste Pollution by Cooperative Disposal of Cement Kilns"

Release date: 2016-12-20

Article Guide

Cement kiln co-processing waste has been widely carried out in some developed countries in the world, reaching a high level, and has achieved good social, environmental and economic benefits.

Theories and practices at home and abroad have proven that the co-processing of wastes using cement kilns is an important technical approach for the harmless, reduction and resource disposal of hazardous waste and municipal solid waste, and also an important measure for low-cost large-scale disposal of the above wastes. . In recent years, China's cement industry has developed vigorously, with material conditions for the extensive disposal of hazardous waste and municipal solid waste.

A few days ago, in order to guide the green recycling and low-carbon development of the cement industry, the Ministry of Environmental Protection has formulated the "Technical Policies for the Cooperative Disposal of Solid Waste Pollution by Cement Kilns", which is now published for reference.

I. General

(1) In order to implement laws and regulations such as the "Environmental Protection Law of the People's Republic of China", prevent and control environmental pollution, guarantee ecological safety and human health, regulate pollution control and management behaviors, and promote the advancement of technology and equipment for solid waste disposal and pollution prevention and control in cement kilns. Promote the green recycling and low-carbon development of the cement industry and formulate this technical policy.

(2) The co-processing of solid waste by the cement kiln referred to in this technical policy refers to putting solid waste that meets or enters the kiln requirements after pretreatment into the cement kiln, and realizes the harmlessness of the solid waste during the production of cement clinker. Disposal process. The types of solid waste disposal mainly include hazardous waste, domestic waste, municipal and industrial sewage treatment sludge, animal and plant processing waste, contaminated soil, and emergency waste.

(3) This technical policy is a guiding document, which mainly includes source control, clean production, end-of-line treatment, secondary pollution prevention, and new technologies to encourage research and development. It is related to environmental protection planning, pollutant discharge standards, environmental impact assessment, Provide guidance on environmental management, such as total volume control, pollution permits, and pollution prevention.

(4) The coordinated disposal of solid wastes using cement kilns shall be rationally planned and arranged in an orderly manner in accordance with the requirements of industrial structure development, overall urban planning, environmental protection planning, and environmental sanitation planning in combination with existing cement production facilities. The co-processing of solid waste by cement kilns should be an important supplementary form of municipal solid waste disposal.

(5) The prevention and control of solid waste pollution during the co-processing of cement kiln should follow the principle of pollution control in the whole process combining source control, clean production and end-of-line treatment. Encourage the use of advanced and reliable production processes and equipment with high energy efficiency and mature and effective pollution control. Technology, strengthen technical guidance and refined management. The coordinated disposal of solid waste in cement kilns shall ensure the safe disposal of solid wastes, and meet the requirements for pollutant discharge standards, without affecting the product quality of cement and the stable operation of cement kilns.

(6) Cement companies that carry out the collaborative disposal of solid waste should strengthen their environmental protection responsibilities, establish and improve environmental monitoring systems and environmental management systems, and ensure that pollutants are discharged consistently during the entire process of coordinated disposal of waste; improve environmental risk prevention and control systems and environmental emergency management System, prepare feasible emergency plans, and actively prevent and improve the ability to respond to environmental emergencies.

Source control

(1) Co-processing of solid waste should use the existing new dry-process cement kiln, and adopt the integrated operation mode of kiln and mill. For solid waste disposal, a single-line clinker with a clinker production scale of 2,000 tons / day or more should be used. After the issuance of this technical policy, a new, rebuilt or expanded cement enterprise that treats hazardous waste should choose a single-line cement clinker with a clinker production scale of 4,000 tons / day or more; a new line, remodeled or expanded cement enterprise that treats other solid waste should choose a single line Designed clinker with a production scale of 3,000 tons / day and above. The co-processing of solid waste in cement kilns that meets the “Conditions for the Cement Industry (2015 Edition)” is encouraged. Prior to the proposed transformation, the requirements of the “Control Standard for Pollution Control of Co-processing of Solid Waste in Cement Kilns” (GB30485-2013) should be met.

(2) The type and scale of solid waste co-processing by the cement kiln should be reasonably determined according to the production process and technical equipment. The use of cement kilns for the co-disposal of radioactive, explosive and reactive wastes, waste electrical appliances, waste batteries and electronics without disassembly, mercury-containing thermometers, sphygmomanometers, fluorescent tubes and switches, chromium slag, and unknown characteristics and Untested waste of unknown nature.

(3) During the trial production period, the newly-built cement kiln co-processing hazardous waste enterprises shall perform performance tests on the co-processing facilities of cement kiln in accordance with the requirements of the “Environmental Protection Technical Specification for Co-processing Cement Kilns for Solid Wastes” (HJ662-2013) to check and verify Evaluate the ability of cement kilns to incinerate and remove organic compounds and control the discharge of pollutants during the co-processing of hazardous waste. The co-processing of medical waste by cement kilns must meet the relevant requirements of the Technical Specification for Environmental Protection of Co-processing of Solid Wastes by Cement Kilns (HJ662-2013).

(4) For the disposal of emergency waste, a cement kiln with the same type of hazardous waste business license should be selected for coordinated disposal. If the conditions cannot be met, an appropriate cement kiln should be selected for collaborative disposal in accordance with the emergency disposal plan approved by the local provincial environmental protection authority.

3. Cleaner Production

(1) The clean production level of cement kiln for co-processing of solid waste shall be regularly audited for clean production in accordance with the requirements of the “Clean Production Evaluation Index System for the Cement Industry” (NDRC Announcement 2014 No. 3).

(2) The cement kiln shall dispose of solid wastes in a coordinated manner, and shall adopt closed, negative pressure, or other effective measures to prevent leakage, fly-off, and foul odors at sites or facilities such as the reception, storage and transportation, pretreatment, and kiln disposal.

(3) Solid waste should be stored separately in cement enterprises, and storage facilities should be constructed separately, and should not be mixed with raw fuel or products for cement production. The storage of hazardous wastes shall also meet the requirements of the “Standards for Pollution Control of Storage of Hazardous Wastes” (GB18597-2001) and “Technical Specifications for the Collection and Storage of Hazardous Wastes” (HJ2025-2012). For unidentified wastes, a temporary storage area should be set up in accordance with the requirements for storage of hazardous wastes, and special access channels should be set up.

(4) Reasonably determine the pretreatment process based on the characteristics of co-processing solid waste and the requirements for entering the kiln. Sewage treatment plants are encouraged to dry the sludge. After drying, the sludge should meet the requirements for direct disposal into the kiln. When sludge drying is carried out in a cement plant, a separate sludge drying system should be set up. The drying heat source should use the waste heat of the cement kiln exhaust gas. Primary domestic waste cannot be directly entered into the cement kiln, and it must be pretreated before entering the kiln. It is strictly forbidden to mix hazardous waste into the domestic garbage during the pretreatment process.

(5) Strictly control the heavy metal content and dosing amount in the co-processing cement kiln waste into the kiln waste; the limit value of the leachable heavy metal content in the cement clinker shall meet the relevant requirements of the Technical Specifications for Co-processing Solid Waste in Cement Kiln (GB30760-2014) . When cement kilns co-process heavy metal hazardous wastes, the frequency of detection of leaching concentrations of heavy metals in cement clinker should be increased. Strictly control the content of chlorine in the kiln waste to ensure the stable operation of the cement kiln and the quality of the cement clinker, and at the same time curb the generation of dioxin-type pollutants.

(VI) The location and method of adding solid waste to the kiln should be based on the operating conditions and pretreatment conditions of the cement kiln. While meeting the requirements of the Technical Specification for Environmental Protection for the Cooperative Disposal of Solid Waste in Cement Kilns (HJ662-2013), The composition, heat value and other parameters should be reasonably compatible to ensure the stable operation of the cement kiln after the solid waste is added. Wastes containing organic volatile substances, foul-smelling wastes and cyanide-containing wastes cannot be put into the raw material preparation system. They should be put into the cement kiln from the high temperature section.

(7) The co-processing of solid waste in a cement kiln shall be equipped with corresponding metering and automatic control feeding devices in accordance with waste characteristics and cement production requirements.

(8) The synchronous operation rate of cement kiln and raw material mill for co-processing solid waste should be gradually increased. Strengthening the emission control measures of volatile heavy metals such as sulfur dioxide and mercury during the outage of raw meal mills, simple ammonia desulfurization measures should not be adopted (desulfurization by-products are not recovered).

Fourth, end governance

(I) Cement kiln co-processing solid waste facilities. High-efficiency bag-type dust collectors should be used for kiln tail flue gas dust removal. Co-processing solid waste facilities such as kiln have been completed before March 1, 2014 and have been put into operation or the environmental impact assessment documents have been approved. The use of an electrostatic precipitator at the end should continue to improve the stability of its operation, improve the efficiency of dust removal, ensure continuous and stable discharge of pollutants, and encourage the transformation of the electrostatic precipitator into a high-efficiency bag type dust collector. Strengthen the operation and maintenance management of the cement kiln dust collector for co-processing solid waste, and ensure that the dust collector and the cement kiln production run 100% synchronously.

(2) The emission control of nitrogen oxides, sulfur dioxide and other pollutants during the co-processing of cement kilns shall implement the relevant requirements of the “Cement Industry Pollution Prevention Technology Policy” (Ministry of Environmental Protection Announcement 2013 No. 31).

(3) The leachate produced by the solid waste co-processing of cement kiln, vehicle washing wastewater and other waste water produced by the co-processing waste processing can be sent to the urban sewage treatment plant for treatment after proper pretreatment, or a separate sewage treatment device will be set up to meet the standard. For reuse, if the amount of wastewater generated is small, it can be directly sprayed into the cement kiln for incineration. Direct discharge of untreated leachate and wastewater in any form is strictly prohibited.

(4) Cement enterprises shall record the operation process of cooperating solid waste disposal and the operation of environmental protection facilities. The conditional projects shall be included in the enterprise operation central control system and have the functions of real-time data query and historical data query. Data records for disposal of hazardous wastes should be kept for more than five years, and data records for disposal of general solid wastes should be kept for more than one year.

(5) Cement enterprises should establish a monitoring system and carry out regular self-monitoring. Focus on strengthening the monitoring of hydrogen chloride, hydrogen fluoride, heavy metals and dioxin pollutants in the kiln tail gas. The exhaust kiln of the cement kiln must be equipped with an automatic online monitoring device for atmospheric pollutants. The monitoring data and information shall be disclosed in accordance with the requirements of the “Supervisory Monitoring and Information Disclosure Measures for Pollution Sources of National Key Monitoring Enterprises (Trial)”.

(6) The exhaust gas discharged from the bypass ventilation system of the cement kiln cannot be directly discharged, and it should be treated with the flue gas at the end of the kiln or separately. Pollutant emission limit values and monitoring methods for the bypass vent exhaust pipe shall comply with the relevant requirements of the “Control Standard for Pollution Control of Solid Waste in Cooperative Disposal of Cement Kilns” (GB30485-2013). The characteristic pollutants not included in the standard shall comply with the relevant emission limit requirements set forth in the environmental impact assessment.

V. Prevention of secondary pollution

(1) The kiln tail dedusting ash for co-processing solid waste cement kiln should be returned to the raw material system, but the kiln tail dedusting ash and bypass vent dust discharged to avoid excessive accumulation of volatile heavy metals such as mercury in the kiln should not be returned to the raw material system. If the kiln ash and bypass airborne dust need to be sent outside the factory for treatment, they should be managed as hazardous waste.

(2) Storage facilities for domestic garbage and municipal sewage treatment sludge shall have good anti-seepage performance and set up sewage collection devices. When there is domestic garbage or sludge in the storage facility, it should be operated under negative pressure.

(3) Exhaust gas from sludge drying system, domestic garbage storage and pretreatment should be sent to the high temperature area of cement kiln for incineration treatment or installation of exhaust gas deodorization facilities in the drying system, and biological and chemical deodorization technologies will be used to achieve the standard. emission. During the kiln shutdown of the cement kiln, the waste gas from solid waste storage and pretreatment, and the waste gas from the sludge drying system must be treated and discharged at the waste gas treatment facility.

6. Encouraging research and development of new technologies

(1) Pollutant emission reduction technology for cement kiln co-processing solid waste in the production process.

(2) Efficient utilization technology of cement kilns for increasing the amount of solid wastes that are co-processed, such as off-line combustion systems for large-volume solid wastes.

(3) Efficient pre-treatment technologies for co-processing solid waste, such as high-quality refuse-derived fuel (RDF) preparation technology; pre-processing technologies to reduce the environmental risk of co-processing of hazardous waste in cement kilns.

(4) Efficient and coordinated removal of multiple pollutants such as dust, sulfur dioxide, nitrogen oxides, and mercury.

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