Carbonization Treatment Of Garden Biomass Waste

With the rapid development of the city,the landscaping business of each city is also rapidly developing.The rapid and effective implementation of landscaping has brought new faces to the city quickly,and it has also made people feel that the environment around them has become better and better.However,the drawbacks of large-scale greening to the city have been neglected by most people.During the process of landscaping and conservation,a large amount of landscaping waste will be generated.These green wastes contain a large amount of organic matter and abundant nutrients.It will not only cause waste of resources,but also cause secondary pollution.Biochar is a stable organic solid with nanopore structure,basic,aromatic-based,and active organic matter,which is obtained by thermal cracking of organic wastes under anaerobic or oxygen-limited conditions.It has been found to play a significant role in soil improvement,heavy metal pollution control,and water pollution absorption.The use of carbonized garden waste can not only solve the enormous pressure it brings to the urban environment,but also realize the resource utilization of garden waste.In this study,first of all,from the investigation of the production of garden waste in Nanjing,the current urban garden waste production and treatment status were analyzed.Then,the internal thermal garden waste carbonization kiln and garden biomass carbon were tested and studied.The production performance was evaluated and analyzed for the characteristics and practicality of garden biomass carbon;finally,the application of garden biomass carbon was analyzed through the ryegrass plot test.(1)Through the study of the field of nanjing 13 sample measurement and questionnaire survey analysis found that:after investigation sample point within a total of 205 species of green vegetation,37 species of evergreen trees,70 species of deciduous trees,deciduous trees species than evergreen trees nearly 50%more,35 species of evergreen shrubs,deciduous shrub of 27,evergreen shrubs species 23%more than the deciduous shrub species,Bamboo and lawn each occupy 10,26;With the increase of the greening area,the amount of garden wastes is increasing.However,the proportion of the grass area and the greening vegetation will affect the output of-garden waste.The proportion of lawn area is small and the area of trees and shrubs is large.The amount of garden waste generated is high,but vice versa,it is low;in the middle of the year,garden waste is the largest,accounting for 36%,followed by summer,accounting for 30%,and spring and winter each occupy 21%and 13%;Garden trees,shrubs,lawns and ground cover species accounted for 37%,28%,and 35%of garden waste.The amount of garden waste generated in plots was 0.017 t·hm-2·d-1.Nanjing City produces garden waste annually 569,000 tons.(2)Through the analysis of the production technology and product analysis of garden biomass carbon,it was found that the internal thermal garden waste carbonization kiln can process 0.35 tons of garden waste per hour and generate 0.073 tons of garden biomass charcoal.This set of equipment can run continuously and energy Self-supply,high carbon production,no smoke and other pollutants to meet production needs;compared with garden waste,the total nitrogen content of garden biomass carbon increased by 15.64%,the total phosphorus content increased by 110%,the total potassium content Increased 142.11%,nitrogen recovery was 34.26%,phosphorus recovery was 62.56%,potassium recovery was 71.74%;Garden charcoal BET surface area increased by 69.51%after carbonization,but the micropore volume and BJH mesoporous adsorption The average pore diameter did not change,demonstrating that high-temperature carbonization will lead to plastic deformation of biochar in the cracking process and impede the formation of micropores;comparing the electron microscope images of garden waste and garden biomass carbon with the carbon-containing functional group,the latter has a better structure and stability.(3)The ryegrass plot test showed that when the volume ratio of garden biomass carbon was 5%,7.5%,and 10%,the number of tillers,chlorophyll,and height of ryegrass increased significantly;when the volume ratio was 10%,the total phosphorus of stems and leaves of ryegrass was 10%.The content was significantly higher than other treatments,and the application of garden biomass carbon had no significant effect on the total nitrogen and total potassium of stems and leaves of ryegrass.The aboveground biomass,underground biomass,and total biomass of ryegrass were significantly higher than those of the control treatments.There was a significant increase;the proline content in stems and leaves of treated ryegrass treated with garden biomass carbon by volume ratio of 5%,7.5%,and 10%was significantly higher than that by CK treatment without garden biomass carbon,and the volume ratio of garden biomass carbon was significantly increased.The catalase content in stems and leaves of ryegrass treated with 7.5%T3 was significantly higher than that without garden biomass carbon.The content of malondialdehyde in stems and leaves of ryegrass without treatment with garden biomass carbon was significantly higher than that of other treatments.The application of garden biomass earbon treatment shows that the application of garden biomass carbon can effectively increase the stress of ryegrass against the environment.