Nitrogen fertilizer immobilization process using active soil and flocculant/adsorbent composite material

Abstract

The invention discloses a nitrogen fertilizer immobilization process using an active soil and flocculant/adsorbent composite material. Attapulgite clay is chemically modified by irradiation to improve dispersibility and can form a multilayer micro-/nano-scale network structure by self-assembly in a water-poor environment under the action of flocculants, the adsorbed nitrogen fertilizer together with the non-adsorbed nitrogen fertilizer is embedded inside the network structure by use of biological carbon with high adsorbability, so that the nutrients of the nitrogen fertilizer are effectively stored in the network structure to prevent free migration of the nutrients and control the loss of the nutrients to the environment. The process can effectively reduce the migration and loss of nitrogen elements, increase the utilization efficiency of chemical fertilizers and reduce the environmental pollution caused by the loss of nitrogen elements. The process can achieve the effects of reducing the discharge of fertilizers, increasing the utilization efficiency of nitrogen fertilizers, reducing the consumption of chemical fertilizers, protecting the environment, reducing the cost and simplifying the process, and is significant in controlling eutrophication non-point pollution of water bodies and protecting the ecological environment.

Description

technical field [0001] The method relates to a novel long-term immobilization method of nitrogen fertilizer, in particular to a nitrogen fertilizer immobilization technology of active soil, flocculant and adsorbent composite material. Background technique [0002] my country is a big producer and consumer of chemical fertilizers. At present, my country's fertilizer utilization rate is very low, nitrogen, phosphorus, and potassium fertilizers are 25% to 30%, 10% to 25%, and 35% to 50%, respectively. At present, my country uses 240 kilograms of chemical fertilizer per hectare, and the amount of fertilizer per unit area is 1.6 times the world average. The utilization rate of chemical fertilizers in my country is much lower than that of developed countries, and the use efficiency of chemical fertilizers is showing a downward trend. The annual loss of nitrogen due to fertilization in the country reaches 16.5 million tons, and the economic loss is nearly 100 billion yuan. The m...

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However, the complex production process or high production co