Optimization of Medical Waste Recycling Network Considering Mobile Treatment
Medical waste refers to the waste generated by medical and health institutions in the course of medical treatment,disease prevention,health care and other related activities,which are directly or indirectly infectious and/or toxic,etc.In recent years,with the increase of people's input in medical treatment and health care,the amount of medical waste has continued to grow.How to properly dispose of medical waste and reduce its ecological pollution so as to lower the risk to public health has become a common concern of the society and the government.Existing medical waste recycling networks mostly make inadequate use of mobile disposal technologies,and have such problems as over-reliance on off-site centralized disposal,heavy concentration of medical waste at points of origin,and long recycling delay for medical institutions in remote areas.In order to improve the on-site disposal capacity of medical waste and reduce the risk of infection and the recycling cost during transportation,we studied the optimization of medical waste reverse logistics network under the recycling mode of"centralized disposal+mobile treatment".Firstly,aiming at minimizing the recycling cost and risk exposure of the disposal unit,we constructed a mixed integer programming model,and designed a SA-ALNS algorithm to solve the model,which uses CW saving algorithm and greedy algorithm to generate the initial feasible solution,and then introduces the Metropolis acceptance criterion to expand the search neighborhood of the solution based on the ALNS algo-rithm.Secondly,we solved 12 small-scale examples and compared the result obtained with that obtained using Gurobi to verify the correctness and effectiveness of the algorithm.Finally,taking the medical waste recycling network of Wuhan as an example,we optimized the recycling mode and vehicle route of the medical institutions,and proposed a collaborative recycling mode of"central-ized disposal+mobile treatment".The calculation result shows that the introduction of mobile disposal tech-nologies could reduce the risk of infection in the recycling network by 28.79%.This research introduces mobile disposal technologies into the reverse recycling network of medical waste,providing a new entry point for the disposal unit to lower recycling cost and reduce the amount of medical waste and workload of the detection and disposal center,which is conducive to the stable operation of the re-cycling system.
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