Unravelling key factors controlling vivianite formation during anaerobic digestion of waste activated sludge

Hao, Xiaodi; Yu, Wenbo; Yuan, Tugui; Wu, Yuanyuan; Loosdrecht, Mark C.M. van

doi:10.1016/j.watres.2022.118976

Cited by 21 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effluent SS concentration of this MBBR system was about 61 mg SS/L, which was much lower than that (i.e., 150–250 mg SS/L) of the typical MBBR process in treating domestic wastewater . A low biomass yield of this system was associated with the high COD removal efficiency of the CEPT process, and the high in situ FNA concentration in the aerobic MBBR had a strong biocidal effect on many microorganisms. , The dosed iron can also increase sludge dewaterability and reduce sludge disposal costs. , It is possible to further recover iron and phosphate in terms of a valuable product, i.e., vivianite, from anaerobically digested sludge. − The produced biogas, if used for energy generation, can generate energy and meet the heat and electricity requirements of the treatment process, as evaluated previously . According to the energy balance, the proposed system could achieve energy self-sufficiency with a net energy production of 329 GJ/y in a WWTP with a treatment capacity of 10,000 m 3 /days (Figure ).…”

Section: Resultsmentioning

confidence: 92%

Toward Energy Neutrality: Novel Wastewater Treatment Incorporating Acidophilic Ammonia Oxidation

Liu

Wang

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

Chemically enhanced primary treatment (CEPT) followed by partial nitritation and anammox (PN/A) and anaerobic digestion (AD) is a promising roadmap to achieve energy-neutral wastewater treatment. However, the acidification of wastewater caused by ferric hydrolysis in CEPT and how to achieve stable suppression of nitrite-oxidizing bacteria (NOB) in PN/A challenge this paradigm in practice. This study proposes a novel wastewater treatment scheme to overcome these challenges. Results showed that, by dosing FeCl 3 at 50 mg Fe/L, the CEPT process removed 61.8% of COD and 90.1% of phosphate and reduced the alkalinity as well. Feeding by low alkalinity wastewater, stable nitrite accumulation was achieved in an aerobic reactor operated at pH 4.35 aided by a novel acid-tolerant ammonium-oxidizing bacteria (AOB), namely, Candidatus Nitrosoglobus. After polishing in a following anoxic reactor (anammox), a satisfactory effluent, containing COD at 41.9 ± 11.2 mg/L, total nitrogen at 5.1 ± 1.8 mg N/ L, and phosphate at 0.3 ± 0.2 mg P/L, was achieved. Moreover, the stable performances of this integration were well maintained at an operating temperature of 12 °C, and 10 investigated micropollutants were removed from the wastewater. An energy balance assessment indicated that the integrated system could achieve energy self-sufficiency in domestic wastewater treatment.

show abstract

Section: Resultsmentioning

confidence: 92%

Toward Energy Neutrality: Novel Wastewater Treatment Incorporating Acidophilic Ammonia Oxidation

Liu

Wang

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Almost all of the iron remained in the digested sludge and accumulated in AnMBR, although 2.9% was present in the permeate (Figure ). In general, during AD, ferrous ions combine with PO 4 3– and S 2– to form solid particles of Fe 3 (PO 4 ) 2 and FeS, respectively. , Notably, a portion of iron and phosphorus remained in the reactor, attributed in part to the accumulation of inorganic iron and phosphorus precipitates on the membrane surface and pores. The magnetic separation of vivianite from sludge was recently reported as a promising method for phosphorus recovery from municipal wastewater .…”

Section: Resultsmentioning

confidence: 99%

Iron Recycle-Driven Organic Capture and Sidestream Anaerobic Membrane Bioreactor for Revolutionizing Bioenergy Generation in Municipal Wastewater Treatment

Ye,

Zhu,

Liu

et al. 2024

Environ. Sci. Technol.

View full text Add to dashboard Cite

The practicality of intensifying organic matter capture for bioenergy recovery to achieve energy-neutral municipal wastewater treatment is hindered by the lack of sustainable methods. This study developed innovative processes integrating iron recycle-driven organic capture with a sidestream anaerobic membrane bioreactor (AnMBR). Iron-assisted chemically enhanced primary treatment achieved elemental redirection with 75.2% of chemical oxygen demand (COD), 20.2% of nitrogen, and 97.4% of phosphorus captured into the sidestream process as iron-enhanced primary sludge (Fe-PS). A stable and efficient biomethanation of Fe-PS was obtained in AnMBR with a high methane yield of 224 mL/g COD. Consequently, 64.1% of the COD in Fe-PS and 48.2% of the COD in municipal wastewater were converted into bioenergy. The acidification of anaerobically digested sludge at pH = 2 achieved a high iron release efficiency of 96.1% and a sludge reduction of 29.3% in total suspended solids. Ultimately, 87.4% of iron was recycled for coagulant reuse, resulting in a theoretical 70% reduction in chemical costs. The novel system evaluation exhibited a 75.2% improvement in bioenergy recovery and an 83.3% enhancement in net energy compared to the conventional system (primary sedimentation and anaerobic digestion). This self-reliant and novel process can be applied in municipal wastewater treatment to advance energy neutrality at a lower cost.

show abstract

“…The emerging phosphorus (P) crisis calls for efficient and sustainable P-recovery from wastes/wastewater. It has been practiced to recover phosphorus from wastewater and/or waste activated sludge (WAS) (Jupp et al, 2021;Liu et al, 2021;Ma and Rosen, 2021), ranging from struvite (Hao et al, 2013) to vivianite (Hao et al, 2022b;Wijdeveld et al, 2022). However, the proper environments suitable for formation of both struvite and vivianite are relatively strict (Hao et al, 2022b(Hao et al, , 2013Prot et al, 2021), and moreover P-recovery efficiencies of struvite and vivianite are not very high, at 15-30% and 40-70%, respectively (Chrispim et al, 2019;van der Kooij et al, 2020;Wijdeveld et al, 2022;Wilfert et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…It has been practiced to recover phosphorus from wastewater and/or waste activated sludge (WAS) (Jupp et al, 2021;Liu et al, 2021;Ma and Rosen, 2021), ranging from struvite (Hao et al, 2013) to vivianite (Hao et al, 2022b;Wijdeveld et al, 2022). However, the proper environments suitable for formation of both struvite and vivianite are relatively strict (Hao et al, 2022b(Hao et al, , 2013Prot et al, 2021), and moreover P-recovery efficiencies of struvite and vivianite are not very high, at 15-30% and 40-70%, respectively (Chrispim et al, 2019;van der Kooij et al, 2020;Wijdeveld et al, 2022;Wilfert et al, 2015). In another approach to P-recovery, WAS-incinerated ash (5-10 P% or 11-23 P 2 O 5 %) have a high potential in the P-recovery efficiency, up to 90% (Fang et al, 2020;Jupp et al, 2021;Liu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Synergy of phosphate recovery from sludge-incinerated ash and coagulant production by desalinated brine

et al. 2023

Self Cite

View full text Add to dashboard Cite

Unravelling key factors controlling vivianite formation during anaerobic digestion of waste activated sludge

Cited by 21 publications

References 39 publications

Toward Energy Neutrality: Novel Wastewater Treatment Incorporating Acidophilic Ammonia Oxidation

Toward Energy Neutrality: Novel Wastewater Treatment Incorporating Acidophilic Ammonia Oxidation

Iron Recycle-Driven Organic Capture and Sidestream Anaerobic Membrane Bioreactor for Revolutionizing Bioenergy Generation in Municipal Wastewater Treatment

Synergy of phosphate recovery from sludge-incinerated ash and coagulant production by desalinated brine

Contact Info

Product

Resources

About