Method for treating 2,4,6-trinitrotoluene waste water and application thereof

Abstract

The invention provides a method for treating 2,4,6-trinitrotoluene (TNT for short) waste water. In the invention, waste water is mainly treated by immobilized microorganisms, an anaerobic biological filter (I-AF) and immobilized microorganisms and a biological aerated filter (I-BAF), wherein the waste water enters a collecting tank, is lifted by a pump to enter a regulating tank and enters a setting tank after being homogenized and neutralized by the regulating tank so as to remove suspended substances (SS) in the waste water; the effluent is discharged after reaching standards after entering three-stage I-AF and five-stage I-BAF for further treatment. The specific steps of the method are shown in the specification. The invention has the advantages that biological treatment adopts an immobilized microorganism technology, which improves the poison resistance of the microorganisms, realizes the high-efficiency removal on toxic and harmful substances of nitrobenzene and the like, reduces the treatment cost and realizes the standard-reaching discharge of the waste water. The application of the invention is not only suitable for treating the TNT waste water but also is applied to treating nitrobenzene and aniline contained pollutants and organic waste water thereof.

Description

technical field [0001] The invention belongs to the field of industrial waste water treatment, and in particular relates to a method for waste water containing nitrobenzene pollutants in the 2.4.6-trinitrotoluene (abbreviated as TNT) industry and an application thereof. Background technique [0002] 2.4.6-Nitrobenzene compounds in trinitrotoluene wastewater are a class of toxic organic pollutants with strong carcinogenicity and mutagenicity. They are listed as environmental priority pollutants by the U.S. Environmental Protection Agency. The conversion of nitrobenzene is a difficult biodegradable compound, which is highly toxic to humans and other organisms, so many countries have strictly restricted the emission standards of nitrobenzene. In view of the high toxicity of nitrobenzene, the effect of traditional biological methods on these pollutants is poor, and it is difficult to ensure that the emissions meet the standards. At present, nitrotoluene wastewater is mainly con...

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Problems solved by technology

In view of the high toxicity of nitrobenzene, the effect of traditional biological methods on these pollutants is poor, and it is difficult to ensure that the discharge is up to standard

At present, nitrotoluene wastewater is mainly converted into aniline by iron-carbon internal electrolysis, and then biologically treated; The method is mainly to convert nitrobenzene into aniline, and then remove it by ferric hydroxide adsorption. The remaining nitrobenzene and aniline are mainly oxidized by Fenton reagent. In addition to complicated operation and high cost, a large amount of sludge generated by internal electrolysis Disposal is still a difficult problem; the most used method at present is to use activated carbon or carbon fiber adsorption to process nitrobenzene (Chinese patent application number 200610151164, application number 00114476, application number 96117148), this method has high processing costs, and the regeneration solution after adsorption It is difficult to deal with; there is also a combined treatment method of high temperature and high pressure oxidation technology and biological treatment, which also has the problems of high treatment cost and unstable treatment effect; there are also people who use carbon tetrachloride or benzene extraction to treat nitrobenzene wastewater (China Patent Application No. 95117037), this method is suitable for the treatment of high-concentration nitrobenzene wastewater, and its main disadvantages are high processing cost, complicated operation control and poor safety. The extracted wastewater cannot reach the standard and still needs to be treated

At present, TNT wastewater is mainly treated by physical and chemical methods, and biological methods are used to treat TNT wastewater, which has not been reported yet.

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