State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Haidian District, Beijing, 100085, China; SCEGC No. 12 Construction Engineering Group Company Ltd., Ankang National High-tech Industries Development Zone, Ankang, Shaanxi, 725000, China.
State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Haidian District, Beijing, 100085, China.
J Environ Manage. 2021 Mar 1;281:111925. doi: 10.1016/j.jenvman.2020.111925. Epub 2021 Jan 7.
High cost of sewer systems usually restricts the sewage collection in rural areas. Many rural areas take traditional sewer scheme whose private-secondary-main sewer diameter is 110-200-300 mm without hydraulic calculation and increased the total cost of sewers. The rational utilization of small diameter sewers might contribute to sewer cost reduction. In this study, rural sewer length and cost models were established taking sewer diameter, household number, and length/width ratio of village as parameters to evaluate the cost benefits of using small diameter sewers. Hydraulic calculation of sewers was applied by Storm Water Management Model to ensure the small diameter sewers were feasible. The results indicate that household number and length/width ratio cause obvious impact on sewer length and cost. Main sewer with 200 mm diameter is suitable for the village with less than 1000 households. Using small diameter sewers can reduce the sewer cost by 6-15% compared with traditional sewer scheme and 110-110-200 might be the better scheme to rural areas because of the low cost (including construction cost and operation and maintenance cost) and high tolerance of sewage flow fluctuation. This study provided the suitable diameter of rural sewers based on cost model and hydraulic calculation which might be helpful for the application of rural sewers.
排水系统成本高昂通常限制了农村地区的污水收集。许多农村地区采用传统的排水方案，其私人-二级-主排水管道直径为 110-200-300mm，没有水力计算，增加了排水系统的总成本。合理利用小直径排水管道可能有助于降低排水成本。本研究以排水管道直径、家庭数量和村庄的长宽比为参数，建立了农村排水管道长度和成本模型，以评估使用小直径排水管道的成本效益。通过 Storm Water Management Model 对排水管道进行水力计算，以确保小直径排水管道的可行性。结果表明，家庭数量和长宽比对排水管道长度和成本有明显影响。直径为 200mm 的主排水管道适用于少于 1000 户家庭的村庄。与传统排水方案相比，使用小直径排水管道可以降低 6-15%的排水成本，而 110-110-200 可能是农村地区更好的方案，因为其成本低（包括建设成本和运营维护成本），对污水流量波动的容忍度高。本研究基于成本模型和水力计算为农村排水管道提供了合适的直径，这可能有助于农村排水管道的应用。
