LIUTian-xin,ZHOUXiao-ping,XUEShu-hong,et al.Application of TMDL Management Mode in Water Environment Treatment of Rural Watersheds[J].China Water & Wastewater,2024,40(4):123-131.
Application of TMDL Management Mode in Water Environment Treatment of Rural Watersheds
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第4期
Page:
123-131
Column:
Date of publication:
2024-02-17
- Keywords:
- rural water environment; management mode; TMDL; permissible discharge; HSPF basin model; watershed management
- Abstract:
- In order to improve the water quality of Chaohu Lake, Shici River basin, a typical rural watershed in Chaohu Lake basin, was selected as the research object. Based on the analysis of hydrology and water pollution in the basin, a HSPF basin model was established to calculate its load and water quality. The total maximum daily load (TMDL) of the Shici River basin was reduced according to the principle of pollutant distribution, so as to meet the water quality standard of the assessment section. Basing on the TMDL, suggestions on water quality management of rural watersheds were put forward. The results showed that the water quality indicators COD, NH3-N, and TP in the main stream of the Shici River exceeded level Ⅲ in Environmental Quality Standards for Surface Water (GB 3838-2002). In addition to clear discharge control, point pollution sources of the basin should also focus on scattered point sources that are difficult to collect in towns, while non-point sources should focus on the land uses of town, village, industry and agriculture. According to the calculation, the allowable pollutant discharge of COD, NH3-N and TP were 1 196.31 kg/d, 30.25 kg/d and 2.43 kg/d, respectively, for the water quality of Shici River assessment section to meet the level Ⅲ standard stably. Meanwhile the zoning and stage management mode from the perspective of time and space is proposed to achieve the stable water quality.
Last Update:
2024-02-17