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Nguyen TAH, Ngo HH, Guo WS, Nguyen TT, Vu ND, Soda S, Nguyen THH, Nguyen MK, Tran TVH, Dang TT, Nguyen VH, Cao TH. White hard clam (Meretrix lyrata) shells as novel filter media to augment the phosphorus removal from wastewater. Sci Total Environ 2020; 741:140483. [PMID: 32615439 DOI: 10.1016/j.scitotenv.2020.140483] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 06/20/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
It is well recognized that filter media play a crucial role in constructed wetlands (CWs) for decontamination of phosphorus (P)-rich wastewater. This study investigates the suitability of raw white hard clam shells (WHC) and white hard clam shells thermally modified at 800 °C (WHC-M800) as potential media to enhance P treatment performance in CWs. The results indicated that both WHC and WHC-M800 displayed appropriate physicochemical properties, such as high porosity, excellent hydraulic conductivity, and rich Ca content. WHC-M800 exhibited a superior P adsorption capacity (38.7 mg/g) to WHC (12.8 mg/g). However, the practical utilization of WHC-M800 as filter media in CWs may be compromised, due to certain limitations, for example: extremely high pH values in the post-adsorption solutions; high weight losses during calcination and adsorption processes; low mechanical strength; and intensive energy consumption. In contrast, the WHC demonstrated significant advantages of reasonably high P adsorption capacity, locally abundant availability, low cost, and marginal side effects. The fractionation of inorganic P of WHC and WHC-M800 revealed that Ca-bounded P was the most dominant binding form, followed by loosely bound P, Fe-P, occluded P, and Al-P. The present study demonstrates that recycling of WHC shells as a potential substrate in CWs provides a feasible method for upgrading P removal in CWs. Additionally, it helps to reduce waste WHC shells in a simple, cheap, and eco-friendly way, thus can double environmental benefits.
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Affiliation(s)
- T A H Nguyen
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - H H Ngo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney, Broadway NSW 2007, Australia.
| | - W S Guo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney, Broadway NSW 2007, Australia
| | - T T Nguyen
- Graduate School of Science and Engineering, Ritsumeikan University (RITs), Biwako-Kusatsu Campus, Shiga 525-8577, Japan
| | - N D Vu
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam; Center for Environmental Technology and Sustainable Development, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - S Soda
- Graduate School of Science and Engineering, Ritsumeikan University (RITs), Biwako-Kusatsu Campus, Shiga 525-8577, Japan
| | - T H H Nguyen
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - M K Nguyen
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - T V H Tran
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - T T Dang
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - V H Nguyen
- Research Center for Environmental Monitoring and Modeling, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - T H Cao
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam; Center for Environmental Technology and Sustainable Development, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
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