What are Volatile Organic Compounds?

Volatile organic compounds, commonly referred to as VOCs, are abbreviations of the first letter of the three words Volatile Organic Compounds. Total volatile organic compounds are sometimes also represented by TVOC.

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The main sources of VOCs: outdoor, mainly from industrial waste gas from fuel combustion and transportation,

Indoor VOC pollution has attracted attention from various countries.

The effects of volatile TVOC on human health are mainly irritation of the eyes and respiratory tract, allergic skin, headaches, sore throat and fatigue, which also contains many carcinogens.

In the "Code for the Control of Indoor Environmental Pollution of Civil Buildings" issued by the new state home, the TVOC content in indoor air has become an evaluation room.

I. General

(1) In order to implement laws and regulations such as the Environmental Protection Law of the People s Republic of China and The Law of the People s Republic of China on the Prevention and Control of Atmospheric Pollution, prevent and control environmental pollution, guarantee ecological safety and human health, and promote technological progress in the prevention and control of volatile organic compounds (VOCs) pollution Develop this technology policy.

(2) This technical policy is a guiding document for reference by all relevant units in environmental protection work.

(3) This technical policy proposes pollution prevention strategies and methods for the production, storage, transportation, sales, use and consumption of VOCs materials and products containing VOCs. VOCs come from a wide range of sources. The main sources of pollution include industrial and domestic sources.

Industrial sources mainly include VOCs-containing raw materials production industries such as petroleum refining and petrochemicals, coal processing and conversion, oil (fuel oil, solvent, etc.) storage, transportation and sales processes, coatings, inks, adhesives, pesticides and other raw materials using VOCs In the manufacturing industry, including the use of VOCs products such as painting, printing, bonding, demolding, and industrial cleaning; living sources include building decoration, catering services, and dry cleaning of clothing.

VOCs pollution control in the oil and gas extraction industry, the pharmaceutical industry, and motor vehicles can be referred to the corresponding pollution control technology policies.

(IV) The prevention and control of VOCs pollution shall follow the comprehensive prevention and control principle of combining source and process control with end treatment. Adopt cleaner production technology in industrial production, strictly control VOCs emissions of VOCs-containing raw materials and products during production, storage, transportation, and marketing, encourage the recycling of resources and energy; encourage the use of alternative products that do not contain VOCs in production and life Or products with low VOCs content.

(V) Through actively conducting surveys on VOCs, formulating and revising VOCs emission standards and management systems for key industries, strengthening monitoring and governance of VOCs, and promoting the use of environmental labeling products, by 2015, basically establish a VOCs pollution prevention system in key areas. ; By 2020, the entire process of reducing VOCs from raw materials to products and from production to consumption will be achieved.

Source and process control

(6) In the petroleum refining and petrochemical industries, the use of advanced clean production technologies is encouraged to improve the efficiency of conversion and utilization of crude oil. VOCs-containing exhaust gas pollution prevention and control technical measures for equipment and pipeline components, process exhaust, exhaust combustion tower (torch), wastewater treatment and other processes include:

1. Develop leak detection and repair (LDAR) plan for leak-prone equipment and pipeline components such as pumps, compressors, valves, flanges, etc., to regularly detect and repair in a timely manner to prevent or reduce running, dripping, dripping, and leaking;

2. The VOCs-containing process exhausts emitted by production facilities should be recycled first, and cannot be (or cannot be completely) recycled and discharged after treatment; the vented gas in emergency situations can be introduced into the combustion tower (torch) and fully burned. After discharge

3. VOCs-containing waste gas generated during wastewater collection and treatment processes meets the standards and is discharged.

(7) In the coal processing and conversion industry, encourage the use of advanced clean production technology to achieve efficient and clean coal conversion, and focus on identifying and checking the prone locations of VOCs leakage in process devices and pipeline components, and formulate prevention and emergency treatment of VOCs leakage Measures for the incident.

(8) Technical measures for the prevention and control of VOCs pollution during the storage, transportation and sales of oils (fuel oil, solvents) include:

1. Storage depots, gas stations and tank trucks should be equipped with corresponding oil and gas collection systems, and storage depots, gas stations should be equipped with corresponding oil and gas recovery systems;

2. Oil (fuel, solvent, etc.) storage tanks should use highly efficient sealed inner (outer) floating roof tanks. When fixed roof tanks are used, VOCs-containing gases are delivered to the recovery equipment through a closed exhaust system;

3. VOCs discharged during the loading process of oil (fuel oil, solvent, etc.) transportation vehicles (car tank trucks, railway tank trucks, tankers, etc.) are collected and transported to the recovery equipment, and can also be returned to the storage tank or sent to the gas pipeline network. .

(9) VOCs pollution prevention and control technical measures for coatings, inks, adhesives, release agents, pesticides and other production industries using VOCs as raw materials include:

1. Encourage the production and sales of water-based, non-organic solvent-based, low organic solvent-based coatings, inks and adhesives that meet the technical requirements of environmental labeling products;

2. Encourage the use of closed integrated production technology, and separate collection and treatment of exhaust gas generated during the production process.

(10) VOCs pollution prevention and control technical measures during the use of VOCs-containing products such as painting, printing, bonding, and industrial cleaning include:

1. Encourage the use of environmentally friendly coatings, inks, adhesives and cleaning agents that have passed environmental labeling product certification;

2.According to the different coating processes, the use of environmentally friendly coatings such as water-based coatings, high-solids coatings, powder coatings, and UV curing coatings is encouraged; the use of electrostatic spraying, shower coating, roller coating, and dip coating is more efficient. High coating technology; open-air spraying operations without VOCs purification and recycling measures should be avoided as far as possible;

3. Promote the use of water-based inks in the printing process. The iron can manufacturing industry encourages the use of UV curing inks, and the book printing industry encourages the use of pre-coated film technology.

4. Encourage the use of water-based, hot-melt and other environmentally-friendly adhesives in the bonding process of wood-based panels, shoes, leather products, packaging materials, etc., and promote the development of solvent-free compounding and co-extrusion compounding technologies in the production of composite films;

5. Eliminate production processes that use trifluorotrichloroethane, methylchloroform and carbon tetrachloride as cleaning agents or solvents. The waste solvents generated during the cleaning process should be collected in a closed manner. The waste solvents with recycling value are treated and reused, and other waste solvents should be disposed of properly;

6. During the use of VOCs-containing products, waste gas collection measures should be taken to improve the efficiency of waste gas collection, reduce the fugitive emissions and fugitive emissions of waste gas, and recycle or treat the collected waste gas to meet the discharge standards.

(11) Technical measures for the prevention and control of VOCs pollution from living sources such as building decoration, clothing dry cleaning, and restaurant fumes include:

1. Promote the use of architectural coatings, low organic solvent-based wood lacquers and adhesives that meet the technical requirements of environmental labeling products in the building decoration industry, and gradually reduce the use of organic solvent-based coatings;

2. In the clothing dry cleaning industry, the production and use of open-type dry cleaning machines should be eliminated, and closed-type dry cleaning machines equipped with compressor refrigeration solvent recovery systems should be promoted, and the use of dry cleaning machines equipped with activated carbon adsorption devices should be encouraged;

3. Encourage the use of piped gas, natural gas, electricity and other clean energy in the catering service industry; advocate low-soot, low-pollution, and low-energy consumption diet.

Third, end governance and comprehensive utilization

(12) Encourage the recycling of VOCs in the industrial production process, and give priority to the reuse in the production system.

(13) For exhaust gas containing high-concentration VOCs, condensate recovery and adsorption recovery technology should be preferentially used for recycling, and other treatment technologies should be used to achieve discharge compliance.

(14) For exhaust gas containing medium-concentration VOCs, organic solvents can be recovered by adsorption technology, or emissions can be achieved after purification by catalytic combustion and thermal incineration technologies. When using catalytic combustion and thermal incineration for purification, waste heat recovery should be performed.

(15) For exhaust gas containing low-concentration VOCs, adsorption technology and absorption technology can be used to recover and discharge the organic solvent when it is valuable. When it is not suitable for recycling, adsorption concentration combustion technology, biological technology, absorption technology, and plasma can be used. Technology or ultraviolet light advanced oxidation technology and other purification standards.

(16) Exhaust gas containing organic halogen components VOCs should be treated by non-incineration technology.

(17) The source of foul gas pollution can be purified by biological technology, plasma technology, adsorption technology, absorption technology, advanced ultraviolet light oxidation technology or combination technology. In addition to meeting the requirements for compliance with the emission standards for purified odorous gases, measures such as high-altitude emissions should be adopted to avoid disturbing the people.

(18) Promote the use of oil fume extraction devices with oil mist recovery functions in the catering service industry, and use high-efficiency oil fume and VOCs purification devices to achieve emissions after purification according to scale, site and climate conditions.

(19) Strictly control the secondary pollution generated during the treatment of VOCs, and for the sulfur, nitrogen, chlorine and other inorganic waste gases generated during the catalytic combustion and thermal incineration, as well as the adsorption, absorption, condensation, and biological treatment processes Wastewater containing organic matter should be discharged after treatment.

(20) Purification materials such as filter materials, adsorbents, and catalysts that cannot be regenerated should be disposed of in accordance with the relevant regulations of the national solid waste management.

4. Encourage research and development of new technologies, new materials and new equipment

Encourage the development and promotion of the following new technologies, materials and equipment:

(21) Cleaner production technologies that can reduce the formation and volatilization of VOCs during industrial production.

(22) Rotary molecular sieve adsorption and concentration technology, efficient regenerative catalytic combustion technology (RCO) and regenerative thermal combustion technology (RTO), nitrogen cycle desorption adsorption recovery technology, efficient water-based enhanced absorption technology, and other Biological purification technology and low-temperature plasma purification technology for specific organic pollutants.

(23) High-efficiency adsorption materials (such as special-purpose activated carbon, high-strength activated carbon fibers, modified hydrophobic molecular sieves, and silica gel, etc.), catalytic materials (such as broad-spectrum VOCs oxidation catalysts, etc.), high-efficiency biological fillers, and absorbents.

(24) Equipment for recovery and comprehensive utilization of volatile organic compounds.

V. Operation and Monitoring

(25) Encourage enterprises to conduct VOCs monitoring on their own and report the monitoring results to the local environmental protection administrative department in a timely and proactive manner.

(26) The enterprise shall establish and improve daily management systems such as operation and maintenance regulations and account books for VOCs governance facilities, and regularly perform maintenance on various types of equipment, electrical equipment, and self-control instruments to ensure the stable operation of facilities.

(27) When end-of-line treatment is adopted by means of adsorption recovery (concentration), catalytic combustion, thermal incineration, plasma, etc., emergency rescue plans such as accident fires and explosions shall be prepared for the unit, and emergency rescue personnel and equipment shall be provided and carried out. Emergency drills. ^[1]