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Study on Water Quality Stabilization Technology for Reclaimed Wastewater as Landscape-Environmental Water by Using Aquatic Plant System

SONG Yong-hui~1,ZHENG Bing-hui~1,LIU You-hua~2,QIU Xiang-yang~2,PENG Jian-feng~11.Chinese Research Academy of Environmental Sciences,Beijing 100012,China2.Shenzhen Institute of Environmental Sciences,Shenzhen 518001,China  
Pilot systems for wastewater reclamation and landscape-environmental reuse at a scale of 11 m~3 were constructed,and the stability of the reclaimed wastewater as landscape-environmental water was observed.The aquatic plant systems with different components were constructed in the landscape-environmental ponds,and the influence of the systems on the reclaimed water quality was studied.It shows that the longest stable time of the reclaimed wastewater in the ceramic pond is 3 d under the conditions of sunny days with water temperature of(28±2) ℃ in the day time and(20±2) ℃ at night;well-constructed "emergentleaf-floating submergent-floating" aquatic plant system can inhibit the algae breeding in the landscape-environmental water body,and the concentrations of organic matter,nitrogen and phosphorus are lowered in the process of reclaimed wastewater reuse;within 9 days the concentrations of COD_(Cr),TP,NH_3-N decrease by 76.9%, 95.8% and 95.2%,respectively,so the water quality keeps stable and is further improved,thus making the reused water quality thoroughly meet the national standard for the reclaimed wastewater in landscape-environmental reuse.Therefore, it is a practical technology to construct aquatic plant system with complete components in the landscape-environmental ponds for the reclaimed wastewater reuse.
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