How to deodorize the sewage station? Deodorization method for sewage treatment plants

Social development will inevitably produce a large amount of sewage odor, which seriously affects people's daily life and needs to be paid attention to and dealt with by relevant departments. So, what are the types of deodorization processes in sewage stations? How?

Next, I will focus on two common types of sewage station deodorization processes.

Combustion deodorization process.

The principle of combustion deodorization technology is to use the flammability of odorous substances, fully mix odorous substances with fuel gas, and convert odorous substances into odorless substances through combustion, so as to achieve the purpose of deodorization. Combustion deodorization is suitable for the treatment of high concentrations of flammable odorous gases. The advantage of combustion deodorization is that the odorous substances can be completely oxidized and decomposed, and the removal efficiency is high.

However, combustion deodorization requires fuel consumption, high operating costs, and is prone to secondary pollution.

The deodorization method of the sewage treatment plant is as follows:

With the development of society, the problem of deodorization has become increasingly prominent, whether it is corporate deodorization or municipal deodorization, it has attracted more and more attention. The odorous gas treatment technologies commonly used in sewage treatment plants mainly include biological filters, biological trickling filtration, plant extract deodorization, activated carbon adsorption deodorization, high-energy ion deodorization, chemical deodorization and active oxygen deodorization.

Here's how:

1. Deodorization of biological filter.

The biological filter mainly includes two parts: the pre-washing section and the biological section. The odor collected by the induced draft fan is pre-washed in the pre-washing section (part of the pretreatment also includes temperature regulation, particulate matter removal, etc.), and then enters the biological section for the treatment of odor pollutants. The pollutants in the gas diffuse from the main body of the gas phase to the water film on the outer layer of the filler, which is absorbed by the filler and finally degraded into carbon dioxide, water, etc.

The treated gas is discharged from the top of the biofilter. The packing layer of the biological filter is adsorbent filter media (such as soil, compost, activated carbon, etc.).

2. Biological trickling filtration and deodorization.

The body of the trickling filter column is a packed column with one or more layers of packing, the surface of which is a biofilm several millimeters thick formed by microbial flora. The liquid containing the soluble inorganic nutrient solution is evenly sprayed on the packing from the top of the column, and the liquid flows from top to bottom, then discharged from the bottom of the column and recycled. The organic exhaust gas enters the biotrickling filter tower from the bottom of the tower, and is purified by contact with the wetted biofilm during the ascent process, and the purified gas is discharged from the top of the tower.

3.Plant extracts deodorize.

The deodorization mechanism of plant extracts is that the odor molecules in the odor are sprayed and adsorbed by the droplets of plant extracts scattered in the space, and various reactions occur at room temperature to produce odorless and non-toxic molecules. Natural plant extract is a plant deodorant formed by microemulsification of oil, juice, or extract extracted from flowers and trees in nature, which can be completely biodegradable, non-toxic, harmless, non-polluting, can eliminate odor, and can play a role in acidic, alkaline, neutral and other pollutants, and can effectively remove odorous gases.

The deodorization methods of sewage treatment plants include: biological filter, biological trickling filter tower, biological filter bed, plant extract deodorization, activated carbon adsorption, etc.

1. Biological filter

The biological filter mainly includes two parts: a humidifier and a biological treatment device. The odor collected by the induced draft fan enters the biological treatment device after being pretreated by the humidification device, and the pollutants in the gas diffuse from the main body of the gas phase to the water film of the outer layer of the filler and are adsorbed by the filler, and finally degraded into carbon dioxide, water, etc., and the treated gas is discharged from the top of the biological filter.

2. Biological trickling filter tower

The main body of the biotrickling filter is a packed tower with one or more layers of packing, and the surface of the packing is a biofilm several millimeters thick formed by microbial flora. The liquid containing the soluble inorganic nutrient solution is evenly sprayed on the packing from the top of the column, and the liquid flows from top to bottom, and then discharged from the bottom of the column and recycled.

3. Biological filter bed

The principle of deodorization of the biological filter bed is to collect and humidify the gas and then input it into the bottom of the biological filter bed through the pipeline and diffuse it in the soil, and a variety of pollutant components in the odor are dissolved in water and adsorbed on the surface of the soil granules. After a period of time, microorganisms targeting odor-causing substances can be gradually cultivated on the surface of soil particles, and odor-causing substances can be continuously decomposed to complete deodorization.

4. Deodorization of plant extract

The mechanism of deodorization of plant extract is that the odor molecules in the odor are sprayed and adsorbed by the droplets of the plant extract dispersed in space, and various reactions occur at room temperature to generate odorless and non-toxic molecules. In sewage plants, plant extract deodorants are mainly used in structures that produce odorous gases and are not easy to collect, such as lifting pump rooms, biological treatment tanks, sludge dewatering workshops, etc.

5. Activated carbon adsorption

The deodorization mechanism of activated carbon adsorption is mainly to use the adsorption effect of activated carbon to make the odorous gas be adsorbed and removed through the adsorbent filling layer. The activated carbon deodorization process is an efficient deodorization technology, which has a large balanced adsorption capacity for odorous substances, and can achieve a good adsorption effect on a variety of odorous gases, but the operation cost is high, and regular maintenance is required, and it is often used for post-treatment of low-concentration odor and deodorization.