ZHANG Hua-jun,LI Yao-jie,LI Sen,et al.Comprehensive Treatment of a Lake with Input of Severe Pollution Source[J].China Water & Wastewater,2020,36(21 21):28-34.
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Comprehensive Treatment of a Lake with Input of Severe Pollution Source

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第36卷 Number: 21 21 Page: 28-34 Column: Date of publication: 2020-11-01
Author(s):
ZHANG Hua-jun1; 2; LI Yao-jie2; LI Sen2; XU Yu-feng1; LI Qiu-hua3
(1. School of Tourism and Resource Environment, Qiannan Normal University for Nationalities, Duyun 558000, China; 2. Shenzhen Techand Ecology & Environment Co. Ltd., Shenzhen 518040, China; 3. Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang 550001, China)
Keywords:
eutrophication; pollution load; comprehensive treatment; water quality improvement
Abstract:
Comprehensive technical system of “contamination source pretreatment and lake water ecosystem construction” was innovatively applied in engineering practice to explore a set of effective heavy polluted lake governance technology system. A series of comprehensive treatment measures such as construction of initial rainwater storage tank, sewage interception into wastewater treatment plant, treatment of tail water by constructed wetland and construction of water ecosystem were used in a lake in Haikou City, and the treatment effect was comprehensively evaluated from chemical and biological indicators. The pretreatment projects greatly reduced the external pollution load and created conditions for the subsequent ecological restoration. After the direct discharged wastewater was treated by the wastewater treatment plant, the concentration of NH3-N and TP was reduced by 63.55% and 84.2%, respectively. The concentration of NH3-N and CODMn in tail water decreased by 59.5% and 74.5% after treated by constructed wetland. After 2 months of water ecosystem construction, the water was clear, and the main water quality indicators were significantly better than those before treatment. After three months, the water ecosystem continued to be stable, DO gradually increased, NH3-N concentration continued to decrease, TP concentration also decreased to a certain extent, and the zooplankton biomass and species increased significantly, indicating that the lake governance goal was achieved. In addition, the water ecosystem built with emergency measures could maintain a relatively stable state after receiving a certain amount of rainwater and sewage overflow in wet season, and had a certain ability to resist external disturbances.
Last Update: 2020-11-01