Method for preparing magnesium salt modified biochar and application thereof

Abstract

The invention belongs to the technical field of bio-environmental protection, and particularly relates to a method for preparing magnesium salt modified biochar and application thereof. The method hasthe advantages of being simple to operate and low in manufacturing cost and can perform large-scale industrial production, so that N2O and NH3 gas emissions in the composting process are significantly reduced, the harm to the environment is reduced, and the compost quality is improved. The preparation method includes: 1) pretreatment of biomass: selecting agricultural and forestry waste, pulverizing the waste to a particle size of less than 5 mm, immersing the waste in 0.2-2 mol / L sodium hydroxide for 8-24 hours, washing with distilled water to be neutral, drying at 105 DEG C; 2) preparationof magnesium salt modified biochar: immersing the product of the step 1) in magnesium chloride solution for 12-14 hours, performing ultrasonic treatment, and then drying at 80-105 DEG C; and performing cracking in a nitrogen atmosphere to obtain the magnesium salt modified biochar.

Description

1. Technical field: [0001] The invention belongs to the technical field of biological environmental protection, and in particular relates to a preparation method and application of magnesium salt modified biochar. 2. Background technology: [0002] With the rapid development of the large-scale breeding industry, my country produces 3.8 billion tons of livestock and poultry manure every year, but the utilization rate is less than 60%, which makes livestock and poultry manure the main pollutant of agricultural non-point source pollution. Therefore, there is an urgent need to find a measure for harmless treatment and resource utilization of livestock and poultry manure. Aerobic composting is the use of aerobic microorganisms to accelerate the humification and stabilization of organic matter, while using the high temperature generated to kill pathogenic bacteria. Because of its low cost, fast and high efficiency, composting has become the main way to treat livestock and poultry...

AI Technical Summary

Problems solved by technology

Mineral Additives For NH 3 The absorption effect is significant, but for N 2 The release of O has no apparent effect

Although nitrification inhibitors can block NH 4 + -N to NO 2 - -N This step reaction reduces nitrogen to N 2 The loss of O form, but it has no effect on the release of ammonia, and the cost is high, so it is difficult to apply in the actual production process at present

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