Preparation method of biodegradable oil absorption microsphere with nitrogen nutrient element slow release function

Abstract

The invention discloses a preparation method of a biodegradable oil absorption microsphere with a nitrogen nutrient element slow release function. The preparation method comprises the following steps of: preparing a urea solution and a formalin solution according to the ratio of 6.5:1, and regulating the pH value of the urea solution to be 7.2-7.4; adding formalin into the urea solution, stirring for 90-100 minutes, regulating the pH value to be 3.2-3.4, and adding deionized water so as to obtain a mixed liquid M; mixing chloroform solutions of beta polyhydroxybutyrate and polyethylene glycol both with the mass percentage of 7.5% according to the ratio of 5:1; dropping M1 into the chloroform mixed solution according to the ratio of 1:4; dropping the obtained mixed solution into a polyving akohol solution with the mass percentage of 3.5% according to the ratio of 1:1; and dropping the polyving akohol solution with the mass percentage of 0.5% into the mixed liquid according to the ratio of 2:1, stirring for 7-8 hours, separating, freezing and drying so as to obtain the microsphere. According to the invention, the preparation technology is simple; the obtained microsphere has high treatment efficiency to petroleum hydrocarbon pollutants and does not generate secondary pollution and damage to a water body.

Description

technical field [0001] The invention belongs to the technical field of treatment of oil-spill-polluted water bodies, and in particular relates to a preparation method of biodegradable oil-absorbing microspheres with the slow-release function of nitrogen nutrient elements. Background technique [0002] In recent years, with the increasing demand for oil and its products in various countries around the world, oil spill accidents have occurred frequently in the process of offshore mining, loading and unloading, transportation and utilization of oil, which not only caused a large amount of crude oil loss, but also caused serious pollution to the environment. It is increasingly threatening the ecological environment of water bodies and land areas, and has long-term harm to water body environment, natural resources and aquaculture resources. Therefore, oil spill pollution in water bodies has become a major environmental problem that people must face. [0003] At present, there are...

AI Technical Summary

Problems solved by technology

However, the cycle of bioremediation technology is relatively long, and the physical adsorption method faces the problem that the adsorbent needs to be re-disposed after the adsorption is saturated. The role is to degrade the petroleum hydrocarbons adsorbed by the adsorbent, and the final biodegradable adsorbent itself can also be completely degraded, which will have greater advantages in dealing with oil spill pollution in water bodies

However, in the process of microbial degradation of petroleum hydrocarbons and the adsorbent itself, the participation of nitrogen nutrients is required. Usually, the nitrogen contained in oil spilled water cannot meet the needs of microorganisms. Therefore, it is necessary to develop a nitrogen-nutrient Adsorbents with element slow release function, but there is still a lack of technology and research reports in this area