Purification method of odor waste gas produced by high-temperature dewatering of sludge

Abstract

The invention discloses a purification method of odor waste gas produced by high-temperature dewatering of sludge. In the process method, two parts, namely a limestone-gypsum desulfurization system and a high-temperature biological drop-filtering tower deodorizing system, are included, wherein SO2 in the odor waste gas is removed by a desulfurizing tower, and then high-temperature deodorizing thermophilic bacterium groups in biological fillers are used to degrade odor and organic components in the odor waste gas by the biological drop-filtering tower. The innovative combined process has the advantages that the deodorization effect is obvious, and a matched cooling system is not needed, so that a large amount of condensate water is prevented from being dissolved out, the investment is saved, the operating cost is low and no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a process method for purifying malodorous waste gas produced by high-temperature dehydration of sludge by using a chemical method combined with a biological method. Background technique [0002] The incineration method is one of the main methods to treat the sludge of the urban sewage plant, and its main process is to dry the sludge first, and then incinerate it. Since the moisture content of raw sludge is above 80%, direct incineration requires a large amount of fuel, which is very uneconomical. Usually, the sludge is dried and dehydrated before incineration, and the volume of the dried sludge will be greatly reduced. The main component of dewatered sludge is carbon organic matter, which has a high calorific value, and then decomposed by incineration can save a lot of fuel. The sludge incineration products only have a small amount of residual inorganic s...

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Problems solved by technology

[0013] 3. The use of normal temperature biological method must reduce the exhaust gas temperature to within 15 ~ 37 ℃, so as to maintain the activity of microorganisms, while the temperature of the tail gas discharged from the sludge drying equipment is still 120 ℃, the microorganisms cannot survive at room temperature, and cooling measures should be taken It will greatly increase energy consumption; and the humidity content in the exhaust gas is relatively large, about 18%. When the temperature of the exhaust gas is lower than 60°C, condensed water will be precipitated, and when the temperature drops below 37°C, a large amount of condensed water will be precipitated, forming secondary Pollution

[0014] 4. Use wet desulfurization to remove SO 2 The final waste gas temperature is still 60-70°C, and the room-temperature microorganisms in the room-temperature biological method are still difficult to maintain activity, and the deodorization efficiency is extremely low

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