Effectiveness of phosphate removal during anaerobic digestion of waste activated sludge by dosing iron(III)

Cheng, Xiang; Wang, Jue; Chen, Bing; Wang, Yu; Liu, Jiaqi; Liu, Lubo

doi:10.1016/j.jenvman.2017.02.009

Cited by 29 publications

(11 citation statements)

References 36 publications

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“…4 ). The unhydrolyzed Fe 3+ would directly generate FePO 4 precipitate with PO 4 3−④ ( Cheng et al, 2017 , Omwene et al, 2018 ), so it would produce large amounts of the aerobic P-Fe containing sludge in MBR ③ . At the same time, the rearrangement of iron and oxygen atoms in the iron hydride resulted in the formation of hematite (Fe 2 O 3 ) ⑤ (2Fe(OH) 3 = Fe 2 O 3 + 3H 2 O) ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Phosphate substances transformation and vivianite formation in P-Fe containing sludge during the transition process of aerobic and anaerobic conditions

Liu

Gao

2021

Bioresource Technology

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Section: Resultsmentioning

confidence: 99%

Phosphate substances transformation and vivianite formation in P-Fe containing sludge during the transition process of aerobic and anaerobic conditions

Liu

Gao

2021

Bioresource Technology

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“…In another study, activated sludge was kept under anaerobic conditions, it was claimed that Fe(III) reduction (with a parallel decrease in dissolved phosphate) resulted in the formation of vivianite without giving experimental evidence (Cheng et al, 2015). In a similar study (with a significant drop in pH), Fe(III) reduction did not result in substantial phosphate removal (Cheng et al, 2017). In purely chemical experiments, it was shown that within 1-5 h efficient phosphate removal could be achieved in secondary effluents when Fe(II) was dosed in the absence of oxygen and XRD indicated that vivianite was formed.…”

Section: Introductionmentioning

confidence: 98%

Fe(III) reduction and vivianite formation in activated sludge

Wilfert

Dugulan

et al. 2019

Separation and Purification Technology

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Kinetics of iron reduction, formation of vivianite and the microbial community in activated sludge from two sewage treatment plants (STPs) with low (STP Leeuwarden, applying enhanced biological phosphate removal, EBPR) and high (STP Cologne, applying chemical phosphate removal, CPR) iron dosing were studied in anaerobic batch experiments. The iron reduction rate in CPR sludge (2.99 mg-Fe g VS -1 h -1 ) was 3-times higher compared to EBPR sludge (1.02 mg-Fe g VS -1 h -1 ) which is probably caused by its 3-times higher iron content. Accordingly, first order rate constants in both sludges are comparable (0.06 ± 0.001 h -1 in EBPR vs 0.05 ± 0.007 h -1 in CPR sludge), thus potential rates in both sludges are comparable. The measured Fe(III) reduction rates suggest that all iron in STP Leeuwarden and STP Cologne can be turned over within 15 h and 44 h respectively.Mössbauer spectroscopy and X-ray diffraction (XRD) indicated vivianite formation within 24 h in both sludges. After 24 h, 53% and 34% of all iron were bound in vivianite in the EBPR and CPR sludge respectively. Next generation sequencing (NGS) showed that the microbial community in the CPR sludge comprised more genera with iron-oxidizing and iron-reducing bacteria. Iron reduction and vivianite formation commence once activated sludge is exposed to oxygen free conditions. Our study reveals that the biogeochemistry of iron in STPs is very dynamic. By understanding the interactions between iron and phosphate crucial processes in modern sewage treatment, such as chemical phosphate removal or phosphate recovery from sewage sludge, can be optimized.

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“…Thus, it is of vital importance to efficiently remove phosphate from wastewater. Biological treatments and chemical precipitation (with iron or calcium salts) are commonly used methods for phosphate removal . But biological treatments are strongly affected by fluctuant temperature, pH, or COD/P .…”

Section: Introductionmentioning

confidence: 99%

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

Yang

Liu

Lǚ

et al. 2018

Surface & Interface Analysis

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Zn-Fe layered double hydroxide with chloride intercalation (ZFCL) was synthesized by a coprecipitation method at room temperature. ZFCL was characterized by N 2 adsorptiondesorption isotherms, X-ray diffraction, scanning electron microscope, Zeta-sizer analyzer, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The results showed that ZFCL had large surface area and layered structure. The maximum adsorption capacity of ZFCL was 150.6 mg/g at 25°C. That was higher than most other adsorbent which were reported. The kinetic data were described better by the pseudo-second-order adsorption kinetic rate model. The adsorption isotherm on the adsorbent was described by Langmuir, Freundlich, and Sips models at pH 6 and followed the fitting order: Sips >Freundlich>Langmuir. Thermodynamic analyses indicated that the phosphate adsorption on ZFCL was endothermic and spontaneous in nature. The sequence of coexisting cations and anions competing with phosphate was Ca 2+ > Mg 2+ > Na + and SO 4 2− > NO 3 − > Cl − . ZFCL can be regenerated by the sequential use of NaOH and ZnCl 2 . The adsorption capacity remained high as 108.6 mg/g after regeneration of 3 times. The results of zeta potential, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analyses indicated that the phosphate adsorption mechanisms involved ion exchange, Zn 3 (PO 4 ) 2 precipitation, and the formation of inner-sphere complex via replacement of surface hydroxyl groups by phosphate.

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Effectiveness of phosphate removal during anaerobic digestion of waste activated sludge by dosing iron(III)

Cited by 29 publications

References 36 publications

Phosphate substances transformation and vivianite formation in P-Fe containing sludge during the transition process of aerobic and anaerobic conditions

Phosphate substances transformation and vivianite formation in P-Fe containing sludge during the transition process of aerobic and anaerobic conditions

Fe(III) reduction and vivianite formation in activated sludge

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

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