Method for preprocessing nitrobenzene-contained waste water by ferrous sulfide

Abstract

The invention discloses a method for preprocessing nitrobenzene-contained waste water by ferrous sulfide, which belongs to the technical field of the sewage processing. The method comprises the following steps of: (1) smashing ferrous sulfide until the granularity is 50-60 meshes, causing the fresh surface of the ferrous sulfide to be exposed by washing with water or acid for standby; (2) adding the processed ferrous sulfide into a reacting container; (3) adding the nitrobenzene waste water into the reacting container, wherein the mass concentration ratio of the ferrous sulfide to nitrobenzene in the reactor is not less than 30:1, and the mass concentration of the ferrous sulfide is not lower than 3.6g / L; and (4) putting the reactor into the anaerobic or anoxic environment to mix the ferrous sulfide with the nitrobenzene waste water, and finishing preprocessing the nitrobenzene waste water after mixing and reacting for 60-180min. With the method, cheap FeS is adopted to preprocess thenitrobenzene-contained waste water. The method is easy to operate and has low cost, and the efficient preprocessing effect on the nitrobenzene is realized within short time, the nitrobenzene removal rate can be above 90%, and the processing cost is greatly saved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a method for pretreating wastewater containing nitrobenzene, more specifically, to a method for pretreating wastewater containing nitrobenzene by using ferrous sulfide. Background technique [0002] Nitrobenzene is widely used in medicine, dyestuffs, pesticides, national defense and other industries. It is a toxic but relatively important chemical raw material. It is one of the 129 pollutants controlled by the U.S. Environmental Protection Agency and 58 of the priority controls determined by my country. One of the toxic chemicals. At present, many methods for treating nitrobenzene wastewater have been proposed at home and abroad, which can be summarized into biological methods, physical methods, and chemical methods. Due to the electron-withdrawing property of the nitro functional group, it is difficult to remove nitrobenzene by biological oxidation; when the biological re...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the high deficiency of the high processing cost of pretreating waste water containing nitrobenzene in the prior art, provide a kind of method utilizing ferrous sulfide to pretreat waste water containing nitrobenzene, the present invention is to utilize cheap FeS to remove waste water Nitrobenzene in nitrobenzene is a simple, effective, and low-cost method for efficient pretreatment of wastewater containing nitrobenzene