Lipophilic controlled release fertilizer for bioremediation of oil pollution environment and preparation method thereof

Abstract

The invention provides lipophilic slow release fertilizer used for modifying environmental creatures in oil pollution positions and a preparation method for the fertilizer. The composition comprises granular nitrogen fertilizer, calcium dihydrogen phosphate, trace elements, polyvinyl alcohol, vegetable oil and fillers. The granular nitrogen fertilizer is placed in a barrate coating machine; the calcium dihydrogen phosphate, the trace elements and the fillers are mixed uniformly and placed in a feeding tank of the coating machine; the polyvinyl alcohol is prepared as water solution with the concentration of 15 percent, poured into an elevated tank of the coating machine and at the same time rotating speed and the temperature are set; the coating machine and an air compressor are started and the water solution is sprayed on a granular surface of nitrogenous fertilizer according to the set rotating speed and the temperature; meanwhile, the mixture of the calcium dihydrogen phosphate, the trace elements and the fillers are continuously sprinkled and the coating machine and the air compressor are heated to be rotated and the mixture is dried; the vegetable oil is dropped gradually and the two machines continue to rotate and then the coating machine and the air compressors are stopped; the temperature of the mixtures is decreased to room temperature to finish the products. The fertilizer can be attached to the oil and can slowly release the nutrients to maintain the constant growth of bacteria cells, thus remarkably promoting modifying efficiency of the creatures in the oil pollution places.

Description

technical field [0001] The present invention aims to provide a kind of lipophilic slow-release fertilizer which can be used for environmental bioremediation of oil polluted field and its preparation method. Efficiency of bioremediation of oil-contaminated sites. Background technique [0002] With the continuous increase of human exploitation of oil and the rapid development of the oil industry, there are more and more ways and opportunities for oil spills. A large amount of petroleum pollutants enter the environment, which not only destroys the ecological balance, restricts economic development, but also affects human health and survival. The efficient and environment-friendly removal methods of petroleum hydrocarbon pollutants are the frontier research fields of great concern in the world. [0003] Bioremediation refers to the controlled or spontaneous process of using organisms, especially microorganisms, to catalyze the degradation of environmental pollutants and reduce...

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Problems solved by technology

[0005] At present, the preparation of slow-release fertilizers specially for the bioremediation of oil-polluted environments has not been reported, and the agricultural slow-release fertilizers developed in the past are mainly used indoors or on-site Biodegradation Test of Petroleum Hydrocarbons

However, the application of agricultural slow-release fertilizers in the field of bioremediation has the following disadvantages: First, the composition and ratio of nutrient elements in agricultural slow-release fertilizers are often set according to the needs of plant growth, and cannot fully meet the growth of hydrocarbon-degrading bacteria. Due to the improper ratio of nutrient elements, it may lead to the slowdown of the biodegradation process of petroleum hydrocarbons or the loss of nutrients and cause other environmental problems; the second is that the coating materials used in some agricultural slow-release fertilizers contain a variety of synthetic polymer materials such as polymers. Acrylic acid, isobutylene, alkyd resin, etc., not only may have a toxic effect on petroleum hydrocarbon degrading bacteria, but also are difficult to degrade, which will cause secondary pollution to the repair environment; third, the surface of agricultural slow-release fertilizers is often hydrophilic. It is not easy to combine or absorb with hydrophobic oil film, and it is not conducive to the attachment of hydrocarbon degrading bacteria, which reduces the efficiency of petroleum hydrocarbon degradation

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