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Open AccessArticle

Synergistic Recapturing of External and Internal Phosphorus for In Situ Eutrophication Mitigation

1
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
2
Sino-Danish College of University of Chinese Academy of Sciences, Beijing 100049, China
3
Department of Environmental Engineering, Technical University of Denmark, DK-2899 Lyngby, Denmark
4
School of Animal, Rural, and Environmental Sciences, Nottingham Trent University, Brackenhurst Campus, Nottingham NG25 0QF, UK
5
Centre of Integrated Water-Energy-Food Studies (iWEF), Nottingham Trent University, Nottinghamshire, Nottingham NG25 0QF, UK
*
Authors to whom correspondence should be addressed.
Water 2020, 12(1), 2; https://doi.org/10.3390/w12010002
Received: 30 November 2019 / Revised: 13 December 2019 / Accepted: 16 December 2019 / Published: 18 December 2019
(This article belongs to the Special Issue Lake and River Restoration: Method, Evaluation and Management)
In eutrophication management, many phosphorus (P) adsorbents have been developed to capture P at the laboratory scale. Existing P removal practice in freshwaters is limited due to the lack of assessment of the possibility and feasibility of controlling P level towards a very low level (such as 10 μg/L) in order to prevent the harmful algal blooms. In this study, a combined external and internal P control approach was evaluated in a simulated pilot-scale river–lake system. In total, 0.8 m3 of simulated river water was continuously supplied to be initially treated by a P adsorption column filled with a granulated lanthanum/aluminium hydroxide composite (LAH) P adsorbent. At the outlet of the column (i.e., inlet of the receiving tanks), the P concentration decreased from 230 to 20 µg/L at a flow rate of 57 L/day with a hydraulic loading rate of 45 m/day. In the receiving tanks (simulated lake), 90 g of the same adsorbent material was added into 1 m3 water for further in situ treatment, which reduced and maintained the P concentration at 10 µg/L for 5 days. The synergy of external and internal P recapture was demonstrated to be an effective strategy for maintaining the P concentration below 10 µg/L under low levels of P water input. The P removal was not significantly affected by temperature (5–30 °C), and the treatment did not substantially alter the water pH. Along with the superior P adsorption capacity, less usage of LAH could lead to reduced cost for potation eutrophication control compared with other widely used P adsorbents. View Full-Text
Keywords: eutrophication control; phosphorus recapturing; lake restoration; phosphorus adsorbent eutrophication control; phosphorus recapturing; lake restoration; phosphorus adsorbent
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Pan, M.; Lyu, T.; Zhang, M.; Zhang, H.; Bi, L.; Wang, L.; Chen, J.; Yao, C.; Ali, J.; Best, S.; Ray, N.; Pan, G. Synergistic Recapturing of External and Internal Phosphorus for In Situ Eutrophication Mitigation. Water 2020, 12, 2.

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