Study On The Effect Of Land Application With Cephalosporin Fermentation Residue In Soil-Plant System

Antibiotic bacterial residue is semi-solid waste produced by antibiotic production enterprises after fermentation and extraction of antibiotic active components.At present,the annual discharge of moist bacterial residue in China is more than 10 million tons,and its moisture content is as high as 90%.It is very easy to deteriorate and smell.If it is not effectively disposed in a timely manner,it will cause environmental pollution,aggravate bacterial drug resistance and harm human health.As cephalosporin is a major antibiotic with a high market share in China,its bacterial residue accounts for the highest proportion among all antibiotic bacterial residue,so it is urgent to solve its environmental problems.This study based on cephalosporin mushroom residue are rich in organic matter and other nutrients and its residual antibiotics in the environment has the characteristics of unstable,easy to decompose,surveying the damage to farmland soil environment,the influence of comprehensive evaluation of mushroom residue utilization of environmental benefits and environmental risks,aimed at our country cephalosporin resource-oriented utilization to provide theoretical basis for the safety of the slag.1)In order to study the feasibility of HT+SD technology in treating antibiotic bacterial residue,the physicochemical properties of HT+SD technology treated cephalosporin bacterial residue were tested.The test results showed that the moisture content,p H,heavy metal content,organic matter and total nutrient content of the bacterial residue fertilizer were analyzed,which all met the limits of the biological organic fertilizer(NY 884-2012)and "Organic Fertilizer"(NY 525-2012).It shows that HT+SD technique is feasible to treat antibiotic bacterial residue into bacterial residue fertilizer.2)According to "the Soil Environmental Quality Control Standard"(GB 15618-2018),8 heavy metals in the field soil,including Cr,Ni,Cu,Zn,As,Cd,Pb and Hg,have not exceeded the limit value,indicating that the risk of heavy metal pollution in the field soil is low.Different fertilization treatments had certain effects on soil bacterial community structure,but different crop species had more obvious effects on soil bacterial community structure than different fertilization treatments.The analysis of the total relative abundance of soil resistance genes showed that the total relative abundance of the resistance genes and the types of the main resistance genes in soybean soil were less affected by the application of cephalosporin residue,and there was no significant difference compared with control or fermented chicken feces(P>0.05).In maize soil,the total relative abundance of resistance genes increased significantly in soil treated with cephalosporin residue.3)The ecological risk evaluation of the application of cephalosporin residue fertilizer to soil showed that the cephalosporin had been completely degraded in the process of the application of cephalosporin residue fertilizer,which was basically harmless to the terrestrial ecosystem.By evaluating the aquatic ecological risk of fertilizing cephalosporin sulfate residue,the characteristic value of aquatic ecological risk of cephalosporin residue was far less than 0.1,indicating a very low level of ecological risk.