Chemical washing and deodorization equipmentThe principle is mainly based on the composition of the odor, using acid (sulfuric acid), alkali (sodium hydroxide), and strong oxidant (sodium hypochlorite) as a washing spray solution to come into contact with odor molecules in the gas, causing the odor components in the gas phase to transfer to the liquid phase, and removing the odor substances through chemical agents and oxidation or other chemical reactions with the odor components.

（1） Chemical washing and deodorization equipment

The commonly used chemical washing equipment is a packed tower, where the chemical absorption liquid is sprayed downwards from the top of the tower, and the exhaust gas flows towards it. The odor comes into contact with the absorption liquid and reacts with it. The ratio of absorption liquid to waste flow rate (liquid/gas ratio) is generally 1-3L/m3, the packing is generally 2-5 meters, and the gas flow rate in the empty tower is generally 0.5-1 meter/second. Fill him with good operation.

（2） Chemical absorbent

The commonly used chemical absorbents include the following:

(1) Chemical absorbent

Alkaline absorbent solutions commonly contain a solution of 1-10% sodium hydroxide, which is highly resistant to hydrogen sulfide. Other substances such as methyl mercaptan, methyl sulfide, methyl disulfide, fatty acids, etc. often cause odors in wastewater treatment plants.

(2) Acidic solution

Acid washing is mainly used for odor caused by alkaline gases such as ammonia, and is generally used with sulfuric acid (0.5-5% solution) as the washing solution.

(3) Sodium hypochlorite solution

Sodium hypochlorite in solution exists in the form of hypochlorous acid (HOCI)

NaOCI+H2O HOCI+NaOH……

At pH 7.5, the chlorine in sodium hypochlorite solution exists as 50% HOCI and OCI - ions. At pH=10, only 0.3% chlorine exists as HOCI, while at pH=1 or 12 ， HOCI dissociates into inorganic hypochlorite ions, so pH control is important.