Method for preparing nitrate-polluted soil mediating inoculant N4 by virtue of sweet potato starch waste liquid

Abstract

The invention relates to a method for preparing a nitrate-polluted soil mediating inoculant N4 by virtue of sweet potato starch waste liquid. On the basis of a bio-transformation method, the sweet potato starch waste liquid, which contains a great amount of nutrient substances such as starch, polysaccharides, pectin, protein and the like, serves as a natural microbiological culture medium to culture beneficial microorganism, namely heterotrophic nitrification bacterium N4; methods for separation, purification and enlarged culture of the N4 bacterium are published in [Separation of Heterotrophic Nitrification Bacteria and Reinforcement of an Activated Sludge Denitrification Effect thereof [J] by YANG Zongzheng, WANG Xin, etc., China Water & Wastewater, 2006, 22 (21): 67-70]; the N4, as the heterotrophic nitrification bacterium, belongs to Gram-negative bacteria; and with the application of the method, a purpose of recycling the waste liquid is achieved, and the waste liquid is applied to bio-remediation of polluted soil, so that circular economy is finally achieved.

Description

technical field [0001] The invention belongs to the field of microbes in biotechnology and the recycling of waste water in environmental engineering, in particular to a method for preparing nitrate polluted soil remediation bacterial agent N4 by using sweet potato starch waste liquid. Background technique [0002] According to reports, 81.2% of the nitrate ingested by the human body comes from vegetables. Therefore, the research on the technology of reducing the accumulation of nitrate in vegetables has become a hot spot that people pay more and more attention to. Vegetables are a kind of crops that are easy to accumulate nitrates. Farmers use excessive nitrogen fertilizers in order to obtain high yields, resulting in the accumulation of nitrates and the decline of vegetable quality. Generally, when the nitrate content in the soil is high, the nitrate content in the vegetables is also high, and vice versa, but there is no one-to-one correspondence between the two. Therefore,...

AI Technical Summary

Problems solved by technology

Vegetables are a kind of crops that are easy to accumulate nitrates. Farmers use excessive nitrogen fertilizers in order to obtain high yields, resulting in the accumulation of nitrates and the decline of vegetable quality.

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