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Suzhou Huawen|Coating occupational waste gas treatment and solid waste handling trends:

Along with the acceleration of the country's progress in the prevention and control of atmospheric and soil pollution, and the increasingly stricter environmental protection regulations, the cost of environmental protection has risen sharply. After undergoing strict control of volatile organic compounds (VOCs), the paint industry is now facing a new dilemma - the cost of solid waste treatment has increased several times in recent years, and sometimes even high prices have no way to deal with it. At the “International Symposium on Environmental Regulations and Best Practices for the Coatings Industry in 2017” held in Beijing on January 13th, the participants combined the relevant guidelines and implementation status of solid waste in North America, Europe and China, as well as the experience of handling advanced solid wastes. The ways to handle solid waste such as coating occupational solid waste treatment, waste packaging treatment, and disposal of paint disposal were discussed. The meeting also discussed and communicated environmental hot spots such as VOC emissions disposal during the production process.

Exhaust gas treatment

Solid waste treatment

Sun Lianying, president of China Coatings Industry Association, pointed out that “promoting transformation with environmental protection and starting with green” has become the vision of China's coatings industry. In this context, it is extremely urgent to increase the reduction and reduction of VOCs and solid waste. However, in the solid waste treatment, the coatings profession is also facing a severe battle.

It is understood that the state stipulates that solid waste generated by enterprises must be disposed of by a third party with processing qualifications, but now in China, the disposal of disposal agents can be limited and the level is uneven. What is even more troublesome is that the country has limited organization to provide discriminating qualifications. Although all localities are actively expanding the disposal of disposables, they still have serious shortages. Some companies have 3 to 5 months a year. No suitable third party could be found to handle the discard. And the pressure to deal with the cost is very large, especially in some southern cities, the cost of throwing things and even reaching 18,000 yuan / ton. In 2016, PPG's Asia Pacific region's disposal of disposables exceeded the first-ever Australian region.

Dr. He Yi, a solid waste and chemical handling skill center of the Ministry of Environmental Protection, said that despite the “12th Five-Year Plan” period, China’s centralized use of risk waste can be greatly improved, but the occupation is unbalanced. In some areas, there will be gaps in the burning and landfill disposal. The combustion and landfill equipment in the central and eastern regions will be fully loaded and even overloaded. The competition for occupational homogenization will be severe. In 2015, the national hazardous waste utilization equipment load rate will be 26.4%, and high-value hazardous waste. Repeated construction of equipment, oversupply, occupational small scattered phenomenon is prominent, and excessive emission phenomena occur from time to time. Along with this, the lack of scientific and technological support, the lack of basic research, the risk waste identification organization and the identification process are not clear. This is the reason why the cost of solid waste treatment is soaring.

He Yi specially reminded that although the National Focal Waste List (2016 edition) will be based on water-based paints, this does not mean that the use of water-based paints for barrier coating or painting, and the waste generated during the painting process will not be at risk. waste. The definition of hazardous wastes in the Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Wastes refers to solid wastes with risk characteristics that may be listed in the National List of Risk Wastes, perhaps based on the risk waste identification specifications and identification methods set by the State. Therefore, although water-based paints are not listed in the National Risk Waste List, they still need to be determined according to the national risk-discipline identification specifications and identification methods to determine whether they are classified as risk waste.

Learn the "reference capital"

In Europe and the United States, there is a wealth of experience in solid waste generated by paint coating. Multinational companies have also taken effective actions in this regard, which is worthy of learning by domestic coating companies.

- PaintCare program

Mr. David, Vice President of the American Coatings Industry Association, discussed and compared the handling, legislation, regulation and practice of solid waste and hazardous waste in North America and Europe. In particular, we introduced different regulatory projects for the construction of coatings in the United States, Canada, the United Kingdom, and Australia, including PaintCare, ProductCare, and others.

According to David, in the United States, paint discards contain unused raw materials, cleaning data, filtered materials, substandard products, dust, laboratory discards, and packaging discards. Regarding the packaging drum, if the remaining material does not exceed 2.5 cm (1 inch) in the container, perhaps the packaging container is below 110 gallons, the material balance does not exceed 3% of the total weight, and the container is above 110 gallons, the material balance does not exceed A total weight of 0.3% can be regarded as an empty container recovery operation.

In addition, some thriving countries and regions have also established a recovery system for coatings, that is, the price of the consumer when purchasing the paint includes a mandatory deposit, which is returned when the packaging container is returned after painting, and then the professional organization handles the solid waste. The American Coatings Industry Association (ACA) pioneered the paint processing solution PaintCare in Oregon in 2009 and subsequently promoted it in other states. Now 12 million gallons of paint have been recovered. In May 2016, the British Coatings Federation (BCF) launched the PaintCare program. This is an industry-led project to recover unused paint. In April 2016, the Australian Paint Manufacturers Association (APMF) implemented the Paintback program, a comprehensive national voluntary program for waste coatings and coatings.

- Teamwork identifies "waste streams"

PPG is committed to working with upstream and downstream to reduce the occurrence of solid discards. At the end of 2015, it proposed a total of 10% of total discards by 2020. Chen Hong, PPH Asia Pacific EHS Project Manager, shared the company's solid waste handling practices. Chen Hong believes that compared with the big chemical industry, the paint professional manual work is more, the degree of automation is low, and the situation of running and dripping is more significant, so the space for reducing the amount of solid waste is larger. PPG has developed a process called “waste flow” that aims to systematically analyze the process of abandonment, identify opportunities for improvement, assist the entire company in fulfilling its vision of continued deployment, better use resources, and achieve operational goals. In the identification process of “waste flow”, the team consisting of production, quality, warehousing and skills first visited the site and found out what kind of discards occurred. What is the amount? Then consider how to reduce the occurrence of discards.

Reduce VOCs to see the whole life cycle

In recent years, the regulatory measures for the emission of VOCs in China have been tightened. See Figure 1. The “Occupational Volatile Organic Compound Reduction Action Plan” promulgated in 2016 selected 11 key occupations such as paints, cars and furniture to accelerate the treatment of waste gas. During the implementation period of the program from 2016 to 2018, the program will reduce the use of solvents such as benzene, toluene, xylene and dimethylformamide (DMF) and additives by more than 20%, and the proportion of low (no) VOCs coating products will reach over 60%. Industrial coating occupation: container VOCs induction removal rate of 80%; coil manufacturing reached 70%; steel structure reached 30%. VOCs control projects have been added from around 20 to about 150, and emission limits have been tightened to 10% to 15% of existing specifications. Exhaust emission specifications range from the end exhaust pipe emission specification to the specification covering the entire process, including process emissions, storage tanks, handling and handling, and wastewater treatment units.

Axalta has been upgrading its product strategy since 2007. Water-based paint systems and high-solids coating systems have replaced solid-solvent systems in high-VOCs, reducing the cost of thousands of tons of solvent per year. Yan Fucheng, Product Director of ASD, China, believes that in order to complete the reduction of VOCs, we must first complete effective collaboration between the professional, regulatory authorities and social welfare, and formulate a reasonable balance of regulations for specific market segments, and fully understand the products. , product line and its operating power.

Shu Guangli, deputy dean of the School of Resources and Environmental Engineering at East China University of Science and Technology, pointed out that there are still many challenges and confusions in VOCs emission reduction: on the one hand, there is a lack of professional VOCs to handle talents, and different cities have different control systems. VOCs Different, the detection methods are different; on the other hand, the company is at a loss when it comes to selecting control skills. In addition, the conflicts between VOCs control and safety, fire protection, energy conservation and other policies, and the contradiction between manipulating investment and emission standards have also made enterprises difficult. He argues that companies and governments should consider the direct and indirect dedication to pollution reduction and the relationship between waterborne coatings and water pollution, solvent-based coatings and air pollution. Together, we should also pay attention to the secondary pollution of VOCs emission reduction means and correctly select suitable exhaust gas treatment equipment. For example, the combustion method will add nitrogen oxides and carbon dioxide emissions; the absorption method will cause water pollutants; the adsorption method will bring solid waste pollution. Thus, the analysis of benefits based on the full life cycle is the key to selecting reasonable skills.

Yang Yuande, secretary-general of China Coatings Industry Association, believes that the “three wastes” that occur during the coating process are far greater than those that occur during the paint production process. Paint coating occupation should reduce solid waste and discharge after organic waste gas treatment. In the process of production, it is necessary to improve the yield of products, complete the production of full-closed integration, avoid spills, leaks, implement lean treatment, and block the occurrence of “three wastes”. Node, progress collection rate and processing rate. In the process of painting and production, on the one hand, it is necessary to use high-solids, water-based and solvent-free coatings; on the other hand, improve the coating method and improve the utilization rate of coatings; in addition, in the final processing, we must improve the "three wastes". Collecting rate and processing rate, correct purchase and use of the final processing equipment.

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Suzhou olefins | coating occupational waste gas treatment and solid waste handling trends

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