Study on the feasibility and stability of drinking water treatment sludge (DWTS)@zeolite to remove phosphorus from constructed wetlands
Journal of Environmental Chemical Engineering, ISSN: 2213-3437, Vol: 10, Issue: 6, Page: 108713
2022
- 18Citations
- 32Captures
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Article Description
The substrate in the constructed wetlands (CW) plays an important role in wastewater treatment. The resource utilization of drinking water treatment sludge (DWTS) has good application prospects, but its powder form is not an ideal substrate and may cause blockage. This paper studies granulated DWTS by loading powdered DWTS on zeolite (DWTS@ZEOLITE). Results show that there should be 1 g of thickener, 5 mL of binder, and 0.15 g of DWTS for the best removal effect. The adsorption process of DWTS@ZEOLITE on phosphorus conforms to the Langmuir model, and the theoretical saturated adsorption capacity is 21.8 mg/g. pseudo-second-order kinetics can be used to fit the adsorption behavior and the adsorption of phosphorus with the DWTS@ZEOLITE was a spontaneous exothermic process. Acidic conditions and humic acid can increase the amount of adsorbed phosphorus, while CO 3 2- inhibits the removal of PO 4 3- due to competitive adsorption. The adsorbed products of DWTS@ZEOLITE after saturation were analyzed, and the main combinations were Fe-P and Al-P. The DWTS@ZEOLITE was characterized by Brunauer Emmett Teller (BET), X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), X-ray spectroscopy (SEM-EDS) etc. BET results show that the specific surface area of DWTS@ZEOLITE is 4.2751 m 2 /g. SEM-EDS results show that the surface of DWTS@ZEOLITE is rough and has obvious phosphorus peaks after reacting with phosphorus. Both XRD and XPS results indicated that the reaction of DWTS@ZEOLITE with phosphorus showed characteristic peaks of FePO 4, AlPO 4 and Ca(H 2 PO 4 ) 2. The Fe, Al, and Ca elements contained in DWTS@ZEOLITE are exchanged with phosphate ligands to achieve adsorption. Finally, Dynamic experiments show that DWTS@ZEOLITE has a good effect on phosphorus, and the saturated adsorption capacity can reach 1774.5 mg/kg. DWTS@ZEOLITE provides a method for the granulation of DWTS) and realizes the resource utilization of DWTSand zeolite.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S221334372201586X; http://dx.doi.org/10.1016/j.jece.2022.108713; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85141419685&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S221334372201586X; https://dx.doi.org/10.1016/j.jece.2022.108713
Elsevier BV
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