Sewage treatment way:
Modern sewage treatment technology, according to its principle of action can be divided into physical treatment, chemical treatment and biological treatment method of three categories.
Cesspool deodorization pathway:
Chemical absorption method, biological method, soil method three.
1, chemical absorption method is through the chemicals (mainly lye) to absorb H2S and other pollutants in the air. Deodorization device by deodorization tanks and regeneration tower. Tank diameter and height ratio is generally: 1:5 or so, odor collected by the ventilation equipment, through the duct from the lower part of the tank into the deodorant tank. With a concentration of 2% -3% of sodium carbonate solution as an odor absorber. The advantages of this method are: good treatment effect, stable operation, shock load resistance; disadvantage is that the agent needs to be replaced periodically, high operating costs.
2, biological method is attached to the filler through the biofilm to degrade the odor in the air, biofilm growth, maturity and biodegradation ability to achieve the process is a biological culture process. Biofilm microorganisms need nutrients from the sewage organic matter, for sewage treatment plants generally use raw sewage on the filler spray. Deodorization tank empty pool residence time of 1-3min (depending on the concentration of odor changes), the inlet flow rate of 2-3m / s. The advantages of this method is to strengthen the management of the case, the treatment effect is good, the operating costs are very low (compared to the other two methods), the disadvantage is: the treatment effect is affected by the concentration of the inlet gas, not very stable, for the spraying of sewage in the concentration of organic matter has certain requirements.
3, soil deodorization method is the collection of gas through the pipeline into the bottom of the deodorization tank and diffuse in the soil (soil to natural soil, humus is appropriate), odor in the process of passing through the soil adsorption of soil particles on the surface of the role of a variety of odorous substances are retained. After a period of time, microorganisms can be gradually cultivated on the surface of soil particles for odor-causing substances, and can continuously decompose odor-causing substances to complete deodorization. At the same time, the surface of the soil deodorization tank can be naturally grown or artificially planted with flowers and plants, forming a good environmental effect. The advantage of soil deodorization is that the investment is small, the operation cost is low, and can be combined with the greening of the plant, without any by-products. The disadvantage is susceptible to the influence of groundwater and low winter temperatures, deodorization effect is general.