In recent years, many small businesses in the phenolic resin industry have closed down due to increasingly strict environmental protection requirements. It can also be seen that the state attaches greater importance to environmental protection. From July 1, 2015, the phenolic resin industry implemented a new synthetic resin industrial pollutant discharge standard. This standard imposes higher requirements on non-methane total hydrocarbons, phenolic compounds, aldehyde compounds, etc. In order to adapt to new emission standards, the company has carried out rectification and upgrading of exhaust gas treatment and sewage treatment to ensure the discharge of exhaust gas and sewage. .
Phenolic resin is made of polycondensation of phenol and formaldehyde. During the production process, waste gas of phenol and formaldehyde will be produced. The production workshop will lead the exhaust gas to the workshop's exhaust gas treatment device through the pipeline. At present, the more common tail gas treatment methods are pickling, caustic washing, and activated carbon adsorption, which may be slightly adjusted to different industries.The company's annual production of 50,000 tons synthetic friction material project uses two levels of water spray plus activated carbon adsorption treatment.The first phase of the project completed the site acceptance of “simultaneous design, simultaneous construction, and production at the same time” of the environment in May 2015, and the air pollutant discharge standards were implemented in accordance with the “Emission Standard for Air Pollutants” (GB/T16297-1996).By July 1, 2015, the phenolic resin industry implemented a new pollutant emission standard for synthetic resin industry, the requirements for air pollutant discharge standards became higher, and the activated carbon adsorption process could no longer meet the requirements.In 2016, the company rectified VOCs and adjusted traditional activated carbon adsorption to oxidation absorption.The company remedies VOC in 2016 adjusted the traditional activated carbon adsorption to oxidation absorption method, and applied this method in the second phase of the company's annual production capacity of 50,000 tons of synthetic resin construction projects to ensure that it meets the emission standards for synthetic resin industry pollutants. (GB31572-2015) requirements.
The phenolic resin reaction is a polycondensation reaction and generates more waste water. The comprehensive reuse and treatment of waste water has become a characteristic process of the company.First of all, wastewater is reused. We collect the waste water in stages and divide the wastewater into high-concentration wastewater and low-concentration wastewater. High-concentration wastewater is reused directly, and low-concentration wastewater is used for thermosetting phenolic resin production.With the progress of the process, the company's wastewater treatment capacity and emissions will gradually decrease; followed by wastewater treatment, wastewater treatment using a combination of pre-polycondensation and biochemical treatment, through the pre-polycondensation recovery of 99.9% of phenol, when the phenol treatment A certain amount of time, enter the biochemical system to deal with, so that it can ensure the discharge of wastewater standards.The new synthetic resin industrial pollutant discharge standard also imposes higher requirements on the discharge of wastewater. However, with the increase of wastewater reuse, the pressure of wastewater treatment has decreased and the cycle has increased. Wastewater discharge can fully meet the requirements of the new emission standards.