Research On The Source Character Of Community Domestic Waste And Its Classification On The Treatment Benefits

With the acceleration of urbanization in China,the phenomenon of waste siege is increasingly serious,and the community is an important source of urban domestic waste.Under the background of the comprehensive implementation of waste classification in Beijing,this paper takes Daxing District of Beijing as an example,focusing on three types of typical communities(urban high-rise communities,urban multi-storey communities,and rural bungalows),and analyzes the output and composition characteristics of household waste.On this basis,it explores the impact of source classification on the physical and chemical properties of end-treatment waste and its comprehensive treatment benefits,and finally analyzes and evaluates the current situation of source classification of community household waste.The results of household waste output and composition characteristics show that the community type is not the key factor affecting the daily per capita output of household waste,and the geographical location affects the daily per capita output of community residents to a certain extent.The average daily per capita waste output of urban communities is higher than that of suburban communities.The characteristics of family sociology significantly affect the daily per capita production of household waste of community residents.Within the scope of this study,the daily household production of household waste shows a downward trend with the increase of family population,the decrease of the average age of family members,and the increase of family monthly income.The proportion of four categories of waste in all types of communities was food waste > residual waste > recyclables > hazardous waste.The main components of food waste were vegetables,fruits and eggshells.The main components of residual waste were disposable packaging and paper.The main components of recyclables were paper,glass and rubber.Source classification will greatly affect the moisture content and wet base low calorific value of residual waste.When the separation rate of food waste is 100%,the moisture content of residual waste in the community is 2.6%～4.7%,and the wet base low calorific value is17640～19700 k J/kg.Compared with the non-classification,the moisture content is reduced by51.6%～53.7%,and the wet base low calorific value is increased by 11080～13140 k J/kg.At present,the terminal treatment of waste in Daxing District is a combination of incineration,aerobic composting and landfill.Taking the output of community food waste and other waste in 2021 as an example,under the existing treatment capacity and without considering the cost of front-end classification collection and transportation,when the accurate classification ratio of food waste is 70 %,the total benefit of terminal treatment of waste reaches the peak.At this time,the moisture content of other waste is 19.6 %,and the low calorific value of wet base is14912 k J/kg.If anaerobic biogas production and incineration are the main treatment methods after technical upgrading and transformation,when the accurate classification ratio of food waste is 80%,the total benefit of waste treatment reaches the peak.At this time,the moisture content of other waste is 14.4%,and the low calorific value of wet base is 16115 k J/kg.Community residents generally support waste classification.Overall,the classification willingness of urban high-level community residents is higher than that of urban multi-level communities,and urban multi-level communities are higher than rural flats.The current survey results of waste classification in various types of communities show that other waste is still the main waste in community cleaning and transportation,and the proportion of food waste cleaning and transportation(16.2%)is still far lower than the proportion of food waste cleaning and transportation(48.1% and 55.0%)under the optimal and accurate theoretical classification ratio(70% and 80%).The main factors affecting the residents to carry out waste classification are lack of rewards and punishments,unsupervised,non-classification or mixed transport,lack of classification facilities,publicity activities and so on.On this basis,the corresponding countermeasures and suggestions are put forward.