High-carbonaceous metallized pellet for treating waste water and preparation method

Abstract

The invention relates to a preparation method of high carbon metalized pellet for waste water treatment, belonging to a technical field of metallurgical products, which is used to solve the problem that the surface passivation is easy to be generated in the material filtering in iron carbon by the method of electrolysis so as to affect waste water treatment effect. The invention is characterized in that: the high carbon metalized pellet contains single iron, activated carbon and few impurities, wherein the particle diameter of the single iron is less than 0.2mm, the activated carbon is a pore structure, the specific surface area reaches 500-800 square meter per gram. The method of the invention is composed of raw material preparation, pellet building, drying, reduction and other steps. Experiments evidence: the product in the invention has rich pore structures and huge specific surface, and has strong capability of absorbing contaminations in waste water, moreover the product has higher reaction activities, good osmosis, easy fluidization and no agglomeration. Compared with the conventional electrolysis process, the COD removal ratio of the used filling is improved by above 50 percent under equal time, the waste water with large variable concentration and wide PH value range can be treated.

Description

technical field [0001] The invention relates to a waste water treatment filter tank filler and a preparation method thereof, in particular to a high-carbon metallized pellet and a preparation method thereof, belonging to the technical field of metallurgical products. Background technique [0002] In recent years, with the rapid development of printing and dyeing, chemical, pharmaceutical, paper and other industries, the discharge of industrial wastewater is increasing day by day. Such industrial wastewater often contains a large number of refractory organic pollutants (such as nitro, gum, heterocyclic and other compounds) and harmful heavy metal ions (such as Cr 6+ , Cu 2+ , Ni 2+ etc.), have poor biodegradability and high toxicity, which pose a serious threat to the ecological environment. At present, wastewater with strong toxicity to organisms is not suitable for direct biological treatment. Instead, physical and chemical methods such as flocculation precipitation, che...

AI Technical Summary

Problems solved by technology

However, there are still some disadvantages in the iron-carbon internal electrolysis process: ①The treatment effect for high-concentration and refractory organic wastewater is unstable; ②After a period of operation, due to the passivation of the surface of the iron filing filler and rust into solids, the wastewater treatment effect is significantly reduced

As we all know, the price of copper is expensive, which will inevitably lead to an increase in the cost of wastewater treatment

In addition, the contact area between copper shavings and iron filings is small, and the interface resistance increases after the copper or iron surface is oxidized, which will reduce the electron transfer rate during the primary battery reaction, thereby reducing the degradation rate of pollutants

[0010] To sum up, although the existing methods have made some progress in solving the problem of iron-carbon internal electrolytic treatment of wastewater, they have not completely solved the problems of passivation, rust and efficiency decline on the surface of iron filings with the prolongation of treatment time.

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