Study On The Preparation Of Slow-release Nutrient Soil By Extracting Phosphate From Kitchen Waste And Its Properties

With the continuous improvement of my country's social economy and the development of the catering industry,the amount of kitchen waste generated has also increased at the same time.If food waste is not handled properly,it will not only affect the quality of people's living environment,but also endanger human health in serious cases.Food waste is solid waste that contains organic matter and elements such as nitrogen,phosphorus,potassium,etc.The recycling of usable materials can realize "turning waste into treasure".In this study,the phosphate in the food waste was extracted and used to prepare nutrient soil particles.The outer coating of the nutrient soil particles can release the nutrients needed by plants slowly.Realize the resource and reduction of solid waste,meet the nutrient needs of plants,and improve the soil environment.The nutrient soil particles are made of potassium phosphate as the main raw material,a certain proportion of bentonite is added,and water is used as the particle binder,mixed with mechanical ball milling,and then manually made into particles.In this paper,through a series of experiments,we mainly use the compressive strength and abrasion rate of the nutrient soil particles to determine the best raw material ratio,the best roasting temperature and time in the process of preparing the nutrient soil particles.It can be seen from the experimental results that the best choice of nutrient soil particles is potassium phosphate: bentonite = 1:3,the best roasting temperature is 600 ?,and the best roasting time is 60 min.The nutrient soil particles prepared under this condition can be found through experimental research that the wear rate and hydrochloric acid solubility rate of the nutrient soil particles meet the standard over time.This study in order to make the nutritional soil particles has better nutrient slow release effect,will be the preparation of the nutritional soil particles impregnated coated experiments,preparation of biochar is coated materials of eat hutch garbage with corn stalk extraction of lignin,dipping after roasting nutritional soil particles in the fluid of the envelope,placed in the oven drying under 60 ? placed dry cooling again after 1 hour,get coated nutritional soil particles.The performance analysis mainly includes the wear resistance analysis,chemical stability analysis and water absorption analysis of the coated nutrient soil particles.The factors affecting the improvement of acid soil by coated vegetative soil particles were also briefly analyzed,including pyrolysis temperature and pyrolysis time.The hydrochloric acid solubility rate of the coated nutrient soil particles also reached the standard and the stability was good.In order to study the slow release effect of the coated nutrient soil particles,they were placed in a simulated soil environment to test the release rate of nitrogen,phosphorus,and potassium nutrients.The performance of coated nutrient soil particles under the optimal preparation conditions was studied,and the coated nutrient soil particles were characterized and analyzed by XRD,SEM,and FT-IR.Through experiments,the slow-release effect of the coated nutrient soil particles was studied with the change trend of the coating thickness,water absorption,swelling,water temperature,p H and release mode of the nutrient soil particles.It was determined that when the coated nutrient soil particles were at a water temperature of 22 °C,a p H of 6.5,and a coating thickness of 0.4 mm,the nutrient sustained release effect was the best.