Ecological treatment process of sewage in expressway service area(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年05期
- Page:
- 176-181
- Research Field:
- 交通工程
- Publishing date:
Info
- Title:
- Ecological treatment process of sewage in expressway service area
- Author(s):
- JI Guobin; ZHANG Nan
-
- Keywords:
- traffic engineering; water pollution control; expressway service area; ecological treatment process
- PACS:
- -
- DOI:
- -
- Abstract:
- Pretreatment and constructed wetland treatments were used as the main processes to treat sewage in the expressway service area. Membrane separation and biological treatment technologies were used for the principal methods of pretreatment of wastewater. After pretreatment, the constructed wetland treats the effluent to attain a certain sewage reuse standard. Removal efficiencies of pollutants in pretreatment and constructed wetland treatment were measured.The effects of temperature, subsystem type, and packing height on ecological treatment were also discussed. The results show that the removal of chemical oxygen demand (COD), 5 days biochemical oxygen demand (BOD5), ammonia nitrogen, and total nitrogen in the constructed wetland achieve good success. After both pretreatment and constructed wetland treatment, the removal rates in the service area are all greater than 95%, and the effluent water quality meets 《The reuse of urban recycling water: Water quality standard for scenic environment use》（GB/T 18921—2002）. Membrane pollution in the pretreatment mainly stems from the mud cake layer, while the inherent microbial resistance of the membrane has little effect on the membrane pollution, based on membrane resistance measurements. The hightemperature season is beneficial to the removal of total nitrogen, while the lowtemperature season affects the removal of COD. The addition of a constructed wetland subsystem in the greenhouse will improve the removal of ammonia nitrogen and total nitrogen by the ecological treatment process due to strengthening of the biofilm. Most ammonia nitrogen is removed by microbial action at a packing height of 40 cm, while most COD is successfully removed at a packing height of 20 cm. The results of this study are useful for exploration of the methods of wastewater treatment and its reuse in the expressway service area. 4 tabs, 2 figs, 25 refs.
Last Update: 2018-10-23