Jiangsu Haipu's Compound Liquid Absorption Method for Treating Low-Concentration Benzene Waste Gas

Common methods for treating low-concentration benzene waste gases include catalytic combustion, adsorption, and absorption. Among these, the absorption method is cost-effective and inexpensive, making it one of the preferred choices for most small and medium-sized enterprises. Building on the traditional absorption method, a new compound liquid absorption method has been proposed, which improves the efficiency of absorbing benzene waste gases. The purification efficiency of this method has reached 88%. This method is characterized by low investment, low operational costs, high purification efficiency, and ease of operation, making it highly valuable for widespread adoption.

Low-concentration benzene waste gases are often generated in industries such as printing, painting, and shoemaking, originating from the volatilization of solvents. The waste gases produced contain carcinogenic substances, posing serious health risks. China has stringent standards for waste gas emissions. During experimental treatment, the concentration of the waste gas affects the treatment outcome. The biochemical removal rate of benzene waste gases varies with the inlet concentration. Within a certain low-concentration range, the treatment efficiency remains unchanged as the concentration increases, but efficiency decreases when the concentration exceeds a certain threshold.

Biotrickling filters have a strong removal capacity for benzene waste gases. In experiments, ceramic materials were used as packing within a certain concentration range. The maximum removal capacity can reach 122g/m³. Since the biochemical removal rate reflects the removal capacity of biotrickling filters for benzene waste gases, biotrickling filters have the highest removal rate for treating benzene waste gases. Research on the bioremoval of different gaseous compounds indicates that the biochemical removal rate is related not only to the reactor but also to the compounds being treated.