Fertilizer for saline-alkali soil based on coal-fired flue gas desulfurization gypsum and sludge and preparation method of fertilizer

Abstract

The invention discloses fertilizer for saline-alkali soil based on coal-fired flue gas desulfurization gypsum and sludge and a preparation method of the fertilizer. The fertilizer is prepared from thefollowing components in parts by weight: 20 to 40 parts of the coal-fired flue gas desulfurization gypsum, 20 to 40 parts of sewage treatment sludge, 40 to 80 parts of fresh plant waste and 5 to 10 parts of ammonium sulfate; Ca<2+> and Mg<2+> in the coal-fired flue gas desulfurization gypsum replace total exchangeable sodium in the saline-alkali soil, so that the content of the total exchangeablesodium in the saline-alkali soil is reduced, and a better soil environment for the normal growth of crops is provided; the sewage treatment sludge contains a large amount of nutrient substances whichhas rich organic matters, nitrogen, phosphorus and potassium, contains a large amount of anaerobic bacteria, and is convenient for quickly performing anaerobic fermentation on a compost pile; fresh plant waste powder is subjected to microbial decomposition and conversion to form humus, can improve the buffer ability of the soil, and can act with sodium carbonate to form sodium humate, so as to reduce the alkalinity of the soil; main raw materials of a soil modifier provided by the invention are taken from industrial and agricultural wastes, and are low-cost, and the improvement cost and the improvement efficiency of the saline-alkali soil are improved.

Description

technical field [0001] The invention relates to a fertilizer for saline-alkali land, and also relates to a preparation method of the fertilizer. Background technique [0002] The area of ​​saline-alkali land in China is huge and has great potential for development and utilization. Among them, coastal saline-alkali land is an important type of saline-alkali land in my country, with a coastline of more than 18,000 kilometers and a relatively wide distribution. [0003] Saline-alkali soil is a general term for saline soil and alkaline soil. Saline soil mainly refers to salinized soil with high chloride or sulfate content. The soil is alkaline, but the pH value is not necessarily high. Alkaline soil refers to the soil containing carbonate or heavy phosphate, the pH value is high, the soil is alkaline, the organic matter content of saline-alkali soil is small, the soil fertility is low, the physical and chemical properties are poor, and there are many anions and cations harmful...

AI Technical Summary

Problems solved by technology

The landfill method is limited by land resources. Sludge incineration is a disposal method that has been widely used in recent years. Its advantage is that it can maximize the reduction of sludge and utilize the characteristics of sludge with a certain calorific value. Combustible waste in sludge is oxidized and decomposed to kill germs, but the cost of sludge incineration is relatively high, about 2-4 times that of other disposal methods