in China can be divided into three categories: construction waste produced by demolition of old buildings, construction waste produced by decoration of existing buildings and construction waste produced by construction of new buildings. There are about 2 billion tons of garbage every year, and there are still a lot of garbage in stock. Improper disposal of construction waste will occupy land, destroy soil quality, affect air quality, pollute waters, destroy city appearance, deteriorate environmental sanitation, and affect the safety of urban operation. In foreign countries, construction waste is recycled by means of source reduction, classified disposal, resource utilization and comprehensive utilization. At present, the resource utilization rate of construction waste in Singapore and Japan is as high as 90%. The resource utilization rate of construction waste (excluding dregs) in China is below 20%. Beijing, Shanghai, Shenzhen, Henan, Jiangsu, Hunan and Zhejiang all have large-scale production lines for the disposal of construction waste and resource utilization, and the level of construction waste resource utilization has been steadily improved. In order to regulate the recycling, utilization and disposal of construction waste, China has promulgated a series of laws, and gradually formed a legal system of resource utilization of construction waste. Local governments have also issued relevant policies and documents to promote the resource utilization of construction waste. 1. The composition of decoration garbage fluctuates greatly, including concrete, bricks, various blocks, ceramics, bamboo and wood, sometimes mixed with domestic garbage, garden garbage, harmful substances, etc. (2) The traditional transfer sorting station is adopted for the resource disposal process of decoration waste, which relies on manual sorting, has a low level of automatic disposal, and lacks sorting measures for special contents such as domestic waste. The design of construction waste classification process is insufficient. The level of resource utilization of construction waste is low. (3) The resource utilization of construction waste in China started late, and there are many difficulties in promoting the resource utilization of construction waste. • The level of resource utilization technology needs to be improved-construction waste disposal technology and equipment, construction waste resource utilization base construction technology, large-scale application technology of recycled products and high value-added upgrading technology. • Imperfect supporting policies-uneven at the local level, multi-sectoral linkage, land security, collection, transportation and disposal, resource utilization management system and franchising system need to be further improved. The standard of construction waste disposal cost is different, and the industrial support and financial preferential measures are not perfect. • The standard system needs to be improved-product standards, construction and acceptance standards for construction waste recycling products, and lack of technical support for product application. Lack of relevant application guidelines. • Incomplete related industrial system-planning, design, construction and operation of disposal base; disposal of construction waste, production and engineering application of recycled materials and products. The industrial chain is not perfect and the collaborative disposal is less. 2. Disposal base construction technology 2. • National level-the variety and quantity of demolition waste and decoration waste are different in different regions. • Specific areas-dedicated disposal sites for waste concrete, fine sorting of demolition waste and decoration waste. • Single site – targeted selection of production processes and equipment. 2. Total floor area: It shall be determined according to the long-term scale, and the land use index shall conform to the relevant provisions of the state on the construction land index of engineering projects. General layout: it shall be determined through technical and economic comparison according to the terrain of the plant (site), wind direction (dominant wind in summer), geological conditions, surrounding natural environment, external engineering conditions, etc., and taking into account construction, operation and other factors; The general layout should be conducive to reducing the impact of dust and noise on the surrounding environment during the transportation and treatment of construction waste, and should prevent cross-contamination among facilities; The general layout of the resource treatment project shall be arranged with the pretreatment and resource utilization plant as the main body, and other facilities shall be reasonably arranged according to the construction waste treatment process and functional zoning, and the overall effect shall be coordinated. • Main facilities: including metering facilities, pretreatment system, disposal system, resource utilization system, raw material and finished product storage system, ventilation and dust removal system, sewage treatment system, plant roads, foundation treatment, flood control, etc. • Auxiliary facilities: including access roads, power supply and distribution, water supply and drainage facilities, living and administrative office management facilities, equipment maintenance, fire fighting and safety and health facilities, vehicle washing, communication, informatization and monitoring, emergency facilities (including temporary storage of construction waste, emergency lighting), etc. • Collaborative design: horizontal collaboration-collaborative disposal of demolition, decoration waste and waste concrete; vertical collaboration-matching of construction waste and different types of recycled building materials products. (2) Construction waste resource utilization production process, production line layout, equipment selection and configuration process route optimization (Figure 1): Decoration waste and demolition waste treatment line adopt the mode of separate construction, separate treatment, collaborative disposal and resource utilization, so as to achieve high efficiency and stability of the process line. Main equipment includes: jaw crusher, vibrating screen, winnowing machine, near-infrared light sorting, eddy current sorting, electromagnetic iron remover, impact crusher, etc. 2) Decoration waste production line: two-stage crushing + three-stage screening process , primary hydraulic double-shaft coarse crushing + primary screening (vibration, magnetic separation, air separation, intelligent robot separation process) + secondary fine crushing + secondary separation (vibration, air separation, photoelectric) + tertiary end fine screening (vibration screen, air separator, Eddy current). According to the above process, the final product is: aggregate (0 ~ 5 mm, 5 ~ 12 mm, 12 ~ 31). The main equipment includes: hydraulic double-shaft crusher, vibrating screen, winnowing machine, intelligent sorting robot, near-infrared light sorting, eddy current sorting, impact crusher, iron remover, etc. 2. The base is located in the east of Quantang Road and north of Guozetang, Waigang Town, Jiading District, with a total construction area of 25948. The treatment process is: coarse separation + bag breaking + crushing + multi-stage screening + aggregate utilization. Some of the products are made of aggregate bricks and recycled, metal and wood recycled. Main equipment: air separation device AirStar1000; light separation device UniSort2800; folding plate air separation ZZS250; screw screening device Unit 625; double-layer vibrating screen SZWS 1600 * 6500. Impact crusher PF1010; jaw crusher PE500 * 750; vibrating screen DYGS100; single-box dust collector; multi-box dust collector. Zenit Z1500 automatic brick production line. The green construction technology of construction waste resource disposal demonstration base includes green construction technology, digital construction technology and efficient construction technology. (1) Demonstration base green construction technology • Environmental automatic monitoring and control technology • Circulating water utilization technology • Prefabricated road permanent combination technology (2) Demonstration base digital construction technology • BI M Construction simulation technology • BIM pipeline collision inspection technology • BIM + IOT energy management • Site management based on QR Code • Quality and safety management and control • Personnel management based on face recognition 0H TML0 UNK1 1 (3) Demonstration base efficient construction technology 0 HTML0 UNK1 2 • New equipment foundation deformation and flatness control technology 0 HTML0 UNK1 3 • New equipment efficient installation technology 0 HTML0 UNK1 4 • Demonstration base construction organization optimization technology 0 HTML0 UNK1 52. Civil construction deployment and process technology for interspersed installation and trial operation of new systems and equipment for resource utilization. Low-impact upgrading construction technology under the condition of ensuring uninterrupted production and operation of the original waste treatment plant. HTML0 Recycle and Harmless 6 (1) Establish a quality control system based on the whole life cycle HTML0 UNK1 7 Construct a complete set of quality control system according to 3R1H (Reduce, Reuse, Recycle and Harmless) principles (Figure 2). The research results are used for the operation management of the project from front-end delivery, transit and terminal disposal. 0HTML0UNK18 Reatly reduces the cost of the CLSM and further promotes the popularization and application of the CLSM. (3) Resource utilization of other construction waste-recycling of waste wood The chemical composition of waste wood includes lignocellulose and minor components, including resin, tannin, essential oil, pigment, alkaloid, pectin, protein, starch and inorganic substances. Pyrolysis, hydrolysis, energy production and new material manufacturing are the main technologies and means for the resource utilization of waste wood. At present, the recovery rate of waste wood in demolition waste and decoration waste can be as high as 90%. 4. Commercial promotion mode 4. Waste concrete disposal, recycled concrete, recycled mortar, recycled water stabilization. (2) Songjiang District Construction Waste Resource Treatment Project relies on the "13th Five-Year" National Key Research and Development Program of the Ministry of Science and Technology. This project is located in Sheshan Town, Songjiang District, Shanghai, with a total construction land area of 77. The process of "two-stage crushing + three-stage sorting" is adopted for decoration waste, and the process of "two-stage crushing + two-stage sorting" is adopted for demolition waste. According to the market situation, recycled aggregate and recycled brick are used as the main resource products. This project, together with the site scope of the wet waste resource treatment facility and Tianma Incineration Plant, is incorporated into the urban waste resource utilization industrial park. (3) Qingpu District Construction Waste Artificial Intelligence Fine Sorting Technology and Equipment Integrated Application Demonstration Base relies on the "13th Five-Year Plan" National Key Research and Development Project of the Ministry of Science and Technology, covering an area of about 76 mu, with an annual disposal capacity of 500000 tons of construction waste. Among them, decoration garbage is 1000 tons per day and demolition garbage is 500 tons per day. The project designs a first-level crushing and sorting line for decoration waste, a first-level crushing and sorting line for demolition waste, a second-level crushing and sorting line, and a buffer area for various materials, all of which are arranged in the integrated construction waste treatment workshop, and a storage area for materials to be sorted is set beside it. The demolition waste treatment process of this project is: "two-stage crushing + two-stage screening + multi-stage sundries sorting"; the decoration waste treatment process is: "two-stage crushing (bag breaking function is reserved) + two-stage screening + artificial intelligence fine sorting technology and equipment + multi-stage sundries sorting". This project adopts domestic equipment, with full mechanized operation and high degree of automation; it adopts energy-saving products, with reasonable equipment selection; it has high degree of recycling, low secondary pollution and energy consumption, and meets the requirements of harmless treatment; the material conveying mode in the field is reasonable, smooth and airtight, to ensure no leakage. Demolition garbage process and decoration garbage process can effectively improve the treatment capacity of equipment, improve the purity of materials after treatment, and thus increase the selling price. It can meet the construction of demonstration base, and the utilization rate of construction waste resources is more than 95%. 4.2 Business Promotion Model 4.2. (1) Policy endorsement at the national level-The Ministry of Housing and Urban-Rural Development and the National Development and Reform Commission issued the Implementation Plan of Carbon Peak in Urban and Rural Construction. It is proposed to promote the centralized treatment and graded utilization of construction waste, and the utilization rate of construction waste resources will reach 55% by 2030. At the same time, the national level has put forward preferential policies for value-added tax and income tax for construction waste disposal and resource utilization enterprises. Policies at the local level-local support policies for strengthening the utilization of construction waste resources are also increasing, promoting advanced and applicable construction technology and construction waste utilization technology, and accelerating the application of construction waste comprehensive utilization products. We will improve the industrial policy, financial support, land factor guarantee and charging system for construction waste, and guide social capital to actively participate in the disposal and resource utilization of construction waste. All kinds of construction projects involving financial funds are encouraged to give priority to the procurement and use of construction waste comprehensive utilization products. (2) Standard support 1) Standard system-The standard focuses on the technology itself of construction waste treatment and recycling stage, mainly focusing on the application of recycled aggregate in concrete, road bricks, ready-mixed mortar and other products, and there are still vacancies in management, site control, equipment and other aspects. The national standard mainly stipulates the design of construction waste recycling plant, the recycling technology of construction waste, the recycled coarse aggregate of concrete, and the recycled fine aggregate of concrete and mortar. Industry standards mainly involve three building materials industry standards (JC), two construction industry standards (JG), three construction industry engineering construction regulations (JGJ), one urban construction industry standard (CJ), two urban construction industry engineering constr uction regulations (CJJ) and one environmental protection standard (HJ). The standards mainly focus on construction waste disposal technology, fixed construction waste recycling plant, recycled products and application technology of recycled products. The current national standards and industry standards mainly focus on the recycling of waste concrete and bricks and tiles in building demolition waste, and the standards for building decoration waste need to be compiled and promoted urgently. 2) Compile guidelines for the application of recycled building materials from construction waste. The technical guidelines for the application of recycled building materials are established from the aspects of the selection of recycled materials from construction waste, the preparation technology of recycled building materials from construction waste and the use of engineering parts to guide and standardize the application of recycled building materials from construction waste concrete. Based on the continuous improvement of the standard system of construction waste resource utilization, the application guide should be compiled, and the standards of recycled materials, recycled building materials and application technology should be improved, focusing on the matching of the variety and quantity of recycled materials and products with the market scale. Develop building material products which are mainly used in housing construction engineering, road engineering and landscaping engineering and are suitable for processing recycled bone (aggregate) materials to replace part of natural aggregates. It mainly includes: housing construction: recycled aggregate wall materials, recycled aggregate concrete and recycled aggregate ready-mixed mortar. Road works: inorganic mixture of recycled aggregate (lime fly ash stabilized macadam and cement stabilized macadam), graded macadam, side flat stone, pervious concrete, pervious concrete pavement brick and concrete pavement brick. Landscaping project: recycled aggregate grass planting brick. (3) Relying on technological innovation-efficient and low-carbon disposal technology of construction waste, green preparation technology of new renewable building materials products, preparation technology of high value-added renewable building materials products (4) Industrial chain coordination with government departments (providing policy support), Industry associations (providing industrial support), planning and design units (providing design for the construction of construction waste disposal bases), base construction units, equipment supply units, disposal bases, research and development institutions (research and development of construction waste disposal and resource utilization technology), building materials units (research and development and production of recycled aggregate concrete, recycled mortar, etc. Recycled wall materials and other recycled building materials products) and construction units (recycled building materials products are applied in construction and good economic and social benefits have been achieved), as shown in Figure 3. 4.2 . Value creation and delivery is the core of the business model. Think about how to provide users and customers with good services or information to obtain value. The value proposition is to position products and services that produce economic, environmental and social values. Value acquisition is at the end of the value chain, with the ultimate goal of producing benefits. 4.2 . Figure 4 shows the composition and framework of the construction waste resource utilization information platform. Conclusion The "five links" of construction waste resource utilization include building demolition, waste treatment, aggregate processing, product preparation and infrastructure application. Establish a sustainable business promotion model of construction waste recycling industry chain synergy based on economic, environmental and social values, which is market-oriented, endorsed by policies, supported by standards, supported by technology, based on industrial chain synergy, and aimed at absorbing and recycling construction waste.
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