Water exchange effect on eutrophication in landscape water body supplemented by treated wastewater

Artificial landscape water bodies filled by treated wastewater pose a risk of developing algal blooms due to high nutrient levels of treated wastewater. In this study, water exchange experiments were conducted using treated wastewater in an artificial landscape pond, and a eutrophication model was c...

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Bibliographic Details
Published in:Urban water journal 2014-02, Vol.11 (2), p.108-115
Main Authors: Qin, Hua-Peng, Khu, Soon-Thiam, Li, Chang
Format: Article
Language:English
Subjects:
Algae
Eutrophication
hydraulic residence time
Landscapes
mathematical modelling
Nutrients
Phosphorus
Ponds
Risk
WASP
Waste water
wastewater reuse
Water treatment
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Summary:Artificial landscape water bodies filled by treated wastewater pose a risk of developing algal blooms due to high nutrient levels of treated wastewater. In this study, water exchange experiments were conducted using treated wastewater in an artificial landscape pond, and a eutrophication model was calibrated and applied to evaluate the effects of water exchange on algae growth in the pond. The results indicate that the joint dilution process and nutrient supply process of water exchange initially cause the algae level to rise and then rapidly decline as the hydraulic resident time (HRT) decreases, and HRT has a critical point at which the pond faces the highest risk of algal bloom. The study also indicates that phosphorus (instead of nitrogen) is the primary limiting factor of algae growth. Therefore, the critical HRT should be avoided and phosphorus is the target pollutant to be controlled in landscape pond water management.
ISSN:1573-062X
1744-9006
DOI:10.1080/1573062X.2012.758294