Occurrence characteristics,treatment status and prevention and control strategies of new pollutants in urban sludge in China
Sludge is an important"sink"of emerging pollutants and the ecological risk caused by emerging pollutants is the key to the resource utilization and safe disposal of sludge.This paper deals with the occurrence characteristics of emerging pollutants in urban sludge in China,summarizes the removal characteristics of emerging pollutants by sludge treatment and disposal,puts forward the shortcomings in the current situation to treat emerging pollutants in sludge,further condenses the key scientific problems still existing in the treatment of emerging pollutants in sludge,and thus puts forward the prevention and control strategies.From the perspective of the existence level of various emerging pollutants in sludge,the detection rate of antibiotics is high,with a concentration of up to μg/g dw;concentrations of perfluorocarbons and endocrine disrupting agents are in the level of ng/g dw;the existence level of microplastics is generally high,with an abundance range of 1600.00～5640.00/kg dw.Sludge anaerobic digestion and aerobic composting treatment technologies can effectively control and reduce the existence of emerging pollutants in sludge.The removal effects of different emerging pollutants are affected by the physical and chemical properties,bioavailability and other conditions of the pollutants themselves.Further research can be conducted on the removal paths and degradation mechanisms of a variety of emerging pollutants coexisting systems.The strategy of optimizing composting conditions and introducing specific microbial strains can be combined to improve the degradation efficiency of emerging pollutants,so as to obtain safer compost products.Land use is the final destination of sludge compost products.It is urgent to carry out ecological risk assessment of various emerging pollutants in the process of sludge land use and establish corresponding limit control standards,so as to provide a scientific basis for the safe use of sludge land.
urban sludgeemerging pollutantoccurrence characteristicscontrol technologyprevention and control strategy
NETL
NSTL
万方数据
