Bacterium strain of reducing trivalence ferric and application thereof

Abstract

The invention discloses reducing ferric iron bacteria strain and its using. It belongs to klebsiella trevisan sp. It is baculiform, single, pairs or short chain arrangement, non spore, and capsule. Gram staining is negative. Concurrently character does not like oxygen. Ferric iron is the final electron acceptor. The invention regenerates Fe(II)EDTA solution by biology method. In NOx complexation absorption process, part of the Fe(II)EDTA is oxidized to Fe(III)EDTA. And the Fe(III)EDTA is reduced to Fe(II)EDTA to regenerate to realize the cyclic utilization of the complexation absorption process.

Description

technical field [0001] The present invention relates to a bacterial strain for reducing ferric iron and its application. Background technique [0002] With the rapid development of industrialization, a large amount of nitrogen oxides (NO X ) emission is one of the main causes of a series of serious air pollution problems such as acid rain and photochemical smog. NO x It mainly comes from fuel combustion process and various industrial production processes, of which more than 90% comes from fuel combustion. With the gradual increase of its emissions and the continuous improvement of people's requirements for environmental quality, many countries have formulated relatively strict NO x emission regulations. Due to the large amount of flue gas emissions and the NO in the flue gas x The main component NO (accounting for 95%) has very low solubility in water, which increases its processing difficulty. Some existing flue gas denitrification technologies have defects such as hi...

AI Technical Summary

Problems solved by technology

But these two technologies still have obvious disadvantages: ① High investment and operation costs, NH 3 It is a toxic and corrosive gas. It is troublesome to store and transport. It has high requirements for pipeline equipment and is expensive. ② It is easy to cause NH 3 Secondary pollution

③Easy to leak, NH 3 It may also be related to the SO in the flue gas 2 reaction, forming corrosive NH 4 HSO 4 , ④NH 3 The reduction of N is not complete, and it is easy to produce toxic and strong greenhouse effect N 2 O, ⑤The catalyst is prone to failure, and the catalyst may also be blocked by powdery fine particles in the flue gas, resulting in high investment and daily operating costs, ⑥The operating temperature range is narrow, etc.

[0003] However, the problem of absorbent regeneration has been hampering the further development of this technology, the most important of which is the regeneration of the complex absorbent Fe(II)EDTA (ferrous ethylenediaminetetraacetate). During the absorption process, Fe(II) ) EDTA will be oxidized by the oxygen in the flue gas, and the Fe(III)EDTA (iron ethylenediamine tetraacetate) produced by oxidation cannot complex absorb NO, thus making the absorbent invalid