1. Condensation Recovery Method: This method directly introduces organic waste gas into a condenser, where it undergoes adsorption, absorption, desorption, and separation, enabling the recovery of valuable organic compounds. It is suitable for conditions with high concentrations of organic waste gas, low temperatures, and small air volumes. This method requires auxiliary refrigeration equipment and is primarily used in the pharmaceutical and chemical industries; it is less commonly adopted by printing companies.

　　Activated Carbon Waste Gas Treatment

　　2. Adsorption method:

　　(1) Direct Adsorption Method: Organic waste gases, after being adsorbed by activated carbon, can achieve a purification rate of over 95%. This method features simple equipment and low initial investment; however, frequent replacement of activated carbon increases the workload associated with loading, unloading, transportation, and replacement, thereby raising operational costs.

　　(2) Adsorption-Regeneration Method: Organic waste gases are adsorbed onto fibrous activated carbon. After the adsorbent is nearly saturated, it is desorbed and regenerated by backflushing with superheated steam. This method requires the supply of an adequate amount of steam.

　　(3) Adsorption-Catalytic Combustion Method: This method combines the advantages of adsorption and catalytic combustion. It employs a novel adsorbent material—honeycomb-shaped activated carbon—to carry out adsorption. When the adsorbent is nearly saturated, hot air is introduced to desorb and regenerate the adsorbent. After desorption, the exhaust gas is fed into a catalytic combustion bed for flameless combustion, thoroughly purifying it. The heated gases are then recycled within the system, significantly reducing energy consumption. This method features stable and reliable operation, low investment costs, low operating expenses, and convenient maintenance. It is particularly suitable for treating large volumes of low-concentration exhaust gases and represents a relatively mature and practical approach currently available in China for the treatment of organic exhaust gases.

　　3. Direct Combustion Method: This method involves burning auxiliary fuels such as gas or oil to heat the mixed gas, thereby decomposing harmful substances into harmless ones under high-temperature conditions. The process is simple and requires low investment, making it suitable for exhaust gases with high concentrations and small air volumes. However, it places higher demands on safety technology and operational procedures.

　　4. Catalytic Combustion: This method involves heating exhaust gases and converting them into harmless, odorless carbon dioxide and water through catalytic combustion. It features low ignition temperature, energy efficiency, high purification rate, convenient operation, a small footprint, and relatively high initial investment. It is particularly suitable for organic exhaust gases at high temperatures or high concentrations.

　　5. Absorption Method: This method typically employs physical absorption, in which exhaust gases are introduced into an absorbent liquid for purification. Once the absorbent liquid becomes saturated, it is heated, desorbed, and then condensed to recover the absorbed substances. This method is suitable for large volumes of exhaust gases at low temperatures and low concentrations; however, it requires a heating, desorption, and recovery unit, resulting in large equipment size and relatively high investment costs.

　　6. Nanometer Microelectrolysis Oxidation Method: The nanometer microelectrolysis purification technology utilizes piezoelectric materials processed at the nanoscale. Under conditions of a certain level of humidity, these materials generate electrostatic adsorption via a microelectrolytic electric field and release large quantities of hydroxyl anions, thereby purifying oxygen-demanding pollutants in gases. This method not only removes most organic compounds from the air but also effectively decomposes inorganic odorous substances such as ammonia nitrogen and hydrogen sulfide.