Chlorella hydrothermal carbon as well as preparation method and application thereof

Abstract

The invention relates to a preparation method of chlorella hydrothermal carbon capable of efficiently enriching phosphorus and application of the chlorella hydrothermal carbon in phosphorus reductionand synergy of farmlands. The method comprises the following steps: collecting chlorella enriched with phosphorus from sewage, and mixing the chlorella with a reaction medium solution containing 2% ofcitric acid, wherein the ratio of the wet chlorella to the reaction medium is 1: (1-4)%; putting a mixture of wet chlorella and the reaction medium solution into a high-pressure hydrothermal reactionkettle, and carrying out hydrothermal carbonization for 1 hour at 240 DEG C and 5-10MPa to obtain a phosphorus-rich chlorella hydrothermal carbon material wherein the total phosphorus content in thegenerated hydrothermal carbon is up to 4.3%, and the available phosphorus content is up to 3.5%; the hydrothermal carbon material is applied to wheat field soil, so that the activity of phosphatase inrhizosphere soil is effectively promoted, available phosphorus is increased, the phosphate fertilizer utilization rate and yield of wheat are increased, and the method has positive significance in phosphorus reduction, synergy and sustainable rice production of the wheat field.

Description

technical field [0001] The invention relates to a chlorella hydrothermal charcoal, a preparation method and application thereof. Background technique [0002] Phosphorus is one of the most important nutrients for maintaining crop growth. The production of phosphate fertilizer mainly depends on the extraction and reprocessing of phosphate in phosphate rock, but according to the current trend of phosphate fertilizer use and population growth, the reserves of phosphate rock on the earth will be exhausted within 50-100 years. Moreover, the phosphate fertilizer applied to farmland often exceeds the needs of plants, and most of the phosphate fertilizer will be lost through runoff or seepage, thereby polluting rivers, lakes and groundwater, causing environmental problems. The loss of phosphorus in farmland often corresponds to the increase of phosphorus in sewage. Therefore, it is urgent to find out new phosphorus fertilizers that can be effectively used by plants, so as to solve...

AI Technical Summary

Problems solved by technology

The cost of direct fertilization is low, but the release rate of available phosphorus from polyphosphate in phosphorus-enriched algae cells is low, which cannot effectively promote the utilization efficiency of phosphorus by crops

Fermentation composting can increase the release of available phosphorus through the decomposition of polyphosphate and organic phosphorus in algae cells by microorganisms under anaerobic conditions, but the disadvantages are that the decomposition is not complete, the fermentation process is slow, and a large amount of ammonia and methane are produced during the fermentation process Lead to serious loss of carbon and nitrogen, resulting in low output of compost

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