Method for processing foul gas through using biological combined technology

Abstract

The invention provides a method for processing a foul gas through using a biological combined technology. The method comprises the following steps: 1, sending the foul gas to the lower portion of a biological washing tower, allowing the foul gas to contact with a biological washing liquid which is sprayed from the top of the tower and comes from the washing segment of a biological washing liquid tank in a countercurrent manner and to stay for 8-10s, and allowing the biological washing liquid to flow out from the bottom of the biological washing tower and enter the biological washing tank; and 2, allowing the foul gas treated by the biological washing tower to enter the bottom of a biological trickling filter tower, to contact with a cycle liquid sprayed from the top of the biological trickling filter tower in a countercurrent manner and to stay for 20-30s, directly discharging after two-level biological trickling filter treatment, and allowing the cycle liquid to flow out from the bottom of the biological trickling filter tower and to enter the cycle liquid tank of the biological trickling filter tower, wherein the biological washing liquid tank comprises the washing segment and a regeneration segment. The method enables the whole foul gas removal rate after the treatment to reach above 95%, and has the advantages of stable running and low operation cost.

Description

technical field [0001] The invention relates to a malodorous gas treatment technology, in particular to a combined biological treatment device for treating malodorous gas containing oil and high-concentration organic pollutants produced in the production process of refining and chemical enterprises. Background technique [0002] Biological treatment of malodorous gas has high purification efficiency and no secondary pollution, and is widely used. However, because the malodorous gas produced in the production process of refining and chemical enterprises not only contains hydrogen sulfide, mercaptan, sulfide, ammonia and other odor pollution, but also contains a large amount of oil gas and organic pollutants, the existing biological treatment method has poor impact resistance. , Poor treatment effect on oil gas and volatile organic gas and low removal rate of insoluble organic pollutants. [0003] In response to this problem, researchers have developed various combined proces...

AI Technical Summary

Problems solved by technology

The problem with this method is that after the surface of the walnut shell is saturated with oil adsorption, an oil-water mixture is formed after being washed with circulating water, resulting in secondary pollution. At the same time, the walnut shell is used for adsorption, resulting in large resistance and high energy consumption of the system.

The problem with this method is that after the activated carbon is saturated with the organic gas, it needs to be regenerated, and the malodorous components are volatilized during the treatment process. At the same time, the resistance of the activated carbon adsorption pretreatment element is large, which is 8-18KPa, and the energy consumption of the device is high during operation.

CN1895746A relates to a high-efficiency biological purification process and system for organic waste gas, which is characterized in that the organic waste gas first passes through the oil mist separator, then enters the ultraviolet (UV) decomposer, and then enters the biological purifier, and adds a surface filter to the biological filtration water circulation system The active agent is used to increase the organic hydrophobic substance from the gas phase to the liquid phase. The process system is complicated, the oil mist separator is easy to block, the ultraviolet (UV) operation is complicated, and the cost is high. Although the residence time in the bioreactor is short, only 5 to 10 seconds , not to improve the treatment effect of the bioreactor, but to reduce the concentration of organic gases entering the biological system through the oil mist separator, ultraviolet (UV) decomposer, adding surfactants to increase the absorption effect of organic gases, although it reduces The content of organic matter in the gas phase, but the oil mist separator produces oily wastewater, the operation of ultraviolet (UV) is complicated, the cost is high, and the wastewater generated at the same time is difficult to treat

CN1745883A introduces a method for purifying malodorous and organic waste gas. It uses waste gas pretreatment-biological treatment-adsorption treatment-secondary biological purification-deep purification process to treat the complex malodorous gas containing sulfur components in sewage plants of petrochemical enterprises. The pretreatment adopts wet type The dedusting tower, biological treatment-adsorption and deep purification unit use adsorbents, the deep purification unit uses wet absorption towers and adsorption materials, and the microbial film formation process uses cross-linking agents. This method has a long process flow and difficult treatment of oily wastewater generated by the pretreatment unit. , the biological treatment-adsorption and deep purification unit uses adsorbents, which need to be replaced, resulting in secondary pollution; the article "Application of Bio-scrubber Treatment of Volatile Organic Waste Gas" shows (Journal of Hengyang Normal University, 2008, Volume 29, Issue 3, 76~ 79), the use of biological scrubbers has a strong ability to remove high-concentration gaseous pollutants, and the treatment efficiency for different compounds reaches 53.7% to 78.6%. 1.5 to 2.0 times, occupying a large area. At the same time, the biological regenerator discharges part of the organic gas during the aeration process, causing new pollution; WO97 / 29832 uses waste water as the organic gas absorption liquid, and the absorption effect is poor, because most organic gases It is insoluble in water, and the waste liquid produced is discharged into the oxidation pond for treatment. The wastewater stays in the oxidation pond for more than 24 hours and occupies a large area.

[0004] To sum up, using chemical methods, physical methods, and photocatalytic methods to treat odorous gases containing oil and volatile organic pollutants in refining and chemical enterprises has secondary pollution, large resistance, high energy consumption, complex processes, and short continuous operation cycles. , occupying a large area, etc.

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