Synergistic recapturing of external and internal phosphorus for in situ eutrophication mitigation

Zhang, M, Pan, M, Zhang, H, Lyu, T ORCID: https://orcid.org/0000-0001-5162-8103, Bi, L, Wang, L, Chen, J, Yao, C, Ali, J, Best, S, Ray, N ORCID: https://orcid.org/0000-0002-5188-4331 and Pan, G ORCID: https://orcid.org/0000-0003-0920-3018, 2019. Synergistic recapturing of external and internal phosphorus for in situ eutrophication mitigation. Water, 12 (2). ISSN 2073-4441

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Abstract

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 m 3 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 µ g/L at a flow rate of 57 L/day with a hydraulic loading rate of 45 m/d. In the receiving tanks (simulated lake), 90 g of the same adsorbent material was added into 1 m 3 water for further in situ treatment, which reduced and maintained the P concentration at 10 µ g/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 µ g/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.

Item Type:	Journal article
Publication Title:	Water
Creators:	Zhang, M., Pan, M., Zhang, H., Lyu, T., Bi, L., Wang, L., Chen, J., Yao, C., Ali, J., Best, S., Ray, N. and Pan, G.
Publisher:	MDPI
Date:	18 December 2019
Volume:	12
Number:	2
ISSN:	2073-4441
Identifiers:	Number Type 10.3390/w12010002 DOI 1259596 Other
Divisions:	Schools > School of Animal, Rural and Environmental Sciences
Record created by:	Linda Sullivan
Date Added:	19 Dec 2019 11:30
Last Modified:	16 Jan 2020 16:18
URI:	https://irep.ntu.ac.uk/id/eprint/38892

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