With the development of industrialization, the waste gas produced in sewage production has an increasing impact on the environment. At present, sewage and waste gas treatment has received extensive attention, so what are the common sewage and waste gas treatment methods? Next, Zhanji will introduce the common sewage and waste gas treatment methods.
Sewage and waste gas treatment**hazards.
The waste gas of the sewage treatment plant is mainly used in the ventilation system of treatment facilities such as biochemical tanks, aeration tanks, sludge thickening tanks, and sludge drying processes. These exhaust gases contain harmful gases such as ammonia, hydrogen sulfide, methyl mercaptan, carbon dioxide, etc., which will cause serious harm to the environment and human health if not treated.
Sewage and waste gas treatment methods.
1. Absorption method:
Absorption is essentially a separation process, which is an operation that transfers contaminants from the gas phase to the liquid phase by contacting a foul gas with a liquid solvent. The absorption method, also known as the wet gas scrubbing method, usually uses water absorption, acid and alkali neutralization to remove the odorous components in the gas. The absorption process is usually carried out in an absorption device such as a packed column, plate column or spray column, and is commonly used to treat odorous gases with lower concentrations and higher flow rates.
2. Adsorption method: The adsorption function of the adsorbent is used to transfer the odor and organic waste gas from the gas phase to the solid phase, which is suitable for treating the odor and organic waste gas with low concentration and high purification requirements. The purification efficiency is very high, and it can deal with multi-component odor and organic waste gas, and the adsorbent is expensive and difficult to regenerate, requiring the odor and organic waste gas to be treated to have a lower temperature and dust content. However, it is easy to use water, dust, and organic waste gases, and the one-time investment cost is high.
3. Biological filter method: after the malodor and organic waste gas are pretreated by dust removal, humidification or cooling, etc., they pass through the filter bed composed of filter material from the bottom of the filter bed from bottom to top, and the odor and organic waste gas are transferred from the gas phase to the mixed phase of water and microorganisms, and are decomposed by the microbial metabolism fixed on the filter material. At present, the process is relatively mature and widely used in practice, and can be subdivided into soil deodorization method, compost deodorization method, peat deodorization method, etc. High purification efficiency, large footprint, high investment cost, easy to clog, packing needs to be replaced regularly, deodorization process is difficult to control, greatly affected by temperature and humidity, biological bacteria training takes a long time, and the recovery time is long after being destroyed.