Method for removing sludge odor through cooperation of metal salt and tannin extract, deodorized sludge and application of deodorized sludge

Abstract

The invention belongs to the technical field of sludge treatment, and particularly relates to a method for removing sludge odor through cooperation of metal salt and tannin extract, deodorized sludge and application of the deodorized sludge. The invention provides a sludge deodorization technology which is high in treatment efficiency, environment-friendly, low in investment cost and capable of meeting the harmless requirements of resource utilization such as subsequent incineration, pyrolysis or carbonization. The tannin extract is used as a multi-group ligand to be subjected to complex reaction with metal ions by utilizing the characteristic that the tannin extract contains rich phenolic hydroxyl groups, so that the bioavailability of protein and other macromolecules is reduced, the generation of low-volatility sulfides is effectively inhibited, and the stink generated in the two processes of sludge standing and combustion is remarkably removed. The whole deodorization process flow is simple and feasible, the operation is flexible, complicated and harsh reaction conditions and expensive instruments and equipment are not needed, the operation cost is low, and the method can be used as a matched pretreatment technology for resource utilization such as sludge incineration, pyrolysis or carbonization and the like.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and more specifically relates to a method for deodorizing sludge with metal salt and tannin extract, deodorized sludge and application thereof. Background technique [0002] Sludge is an inevitable product of sewage treatment plants in the process of treating domestic and industrial wastewater. It is characterized by a large amount of production and complex components, containing a large number of pathogenic microorganisms, heavy metals and organic substances, and is easy to rot and smell. Sludge that has not been properly and safely treated will easily cause harm to the soil, water sources, and even the human body through the food chain after it re-enters the environment. Moreover, proper and reasonable treatment and utilization of sludge can make it "turn waste into treasure" and generate huge Ecological, economical and social benefits. At present, the use of concentration, digestion,...

AI Technical Summary

Problems solved by technology

[0005] The above invention patents only focus on the role of tannin extract in improving the dewatering performance of sludge, but do not realize that tannin extract with polyphenolic hydroxyl structure can inhibit the formation of malodorous substances in sludge, and has a certain potential for deodorization of sludge

On the other hand, ammonia, hydrogen sulfide, methyl mercaptan, methyl sulfide, carbon disulfide and other odors will still appear in the sludge treated by the technical method of the above-mentioned invention patent application in the subsequent resource utilization process such as incineration, pyrolysis or carbonization. The problem of toxic and harmful substances such as odor gas and dioxin needs to be properly resolved

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