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Increasing phosphorus fertilizer value of recycled iron phosphates by prolonged flooding and organic matter addition

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Pedosphere 2024年第3期34卷 631-640页

作者： Rochelle Joie SARACANLAO Hannah VAN RYCKEL Mieke VERBEECK Maarten EVERAERT Erik SMOLDERS Division of Soil and Water Management Department of Earth and Environmental ScienceKU LeuvenKasteelpark Arenberg 20Heverlee B-3001(Belgium) Soil Service of Belgium.Willem De Croylaan 48 Leuven 3001(Belgium)

Iron(Fe)minerals are commonly used to remove phosphorus(P)from waste streams,producing P-loaded Fe(Ⅲ)oxides or Fe(Ⅱ)phosphate minerals(e.g.,vivianite).These minerals may be used as fertilizers to enhance P circularity if solubilized in soil.Here,we tested the P fertilizer value of recycled Fe phosphates(FePs)in a pot trial and in an incubation experiment,hypothesizing that P release from FePs is possible under Fe(Ⅲ)-reducing conditions.First,a pot trial was set up with rice(Oryza sativa)in all combinations of soil flooding or not,three P-deficient soils(acid,neutral,and calcareous),and six FePs(three Fe(Ⅲ)Ps and three Fe(Ⅱ)Ps)referenced to triple superphosphate(TSP)or zero amendments.Shoot P uptake responded to TSP application in all treatments but only marginally to FePs.The redox potential did not decrease to-200 mV by flooding for a brief period(13 d)during the pot trial.A longer incubation experiment(60 d)was performed,including a treatment of glutamate addition to stimulate reductive conditions,and P availability was assessed with CaCl_(2)extraction of soils.Glutamate addition and/or longer incubation lowered soil redox potential to<-100 mV.On the longer term,Fe(Ⅲ)minerals released P,and adequate P was reached in the calcareous soil and in the neutral soil amended with Fe(Ⅲ)P-sludge.It can be concluded that prolonged soil flooding and organic matter addition can enhance the P fertilizer efficiency of FePs.Additionally,application of FeP in powder form may enhance P availability.

关键词： agronomic efficiency circular economy P-loaded Fe(Ⅲ)oxides paddy soil vivianite redox

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Extracellular polymeric substance induces biogenesis of vivianite under inorganic phosphate-free conditions

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Journal of Environmental Sciences 2022年第10期34卷 115-124页

作者： Xinrui Hao Jie Tang Xiaoyun Yi Kun Gao Qian Yao Chunhua Feng Weilin Huang Zhi Dang School of Environment and Energy South China University of TechnologyGuangzhou 510006China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of EducationSouth China University of TechnologyGuangzhou 510006China Department of Environmental Science Rutgers UniversityNew BrunswickNJ 08901USA

vivianite is often found in reducing environments rich in iron and phosphorus from organic debris degradation or phosphorus mineral dissolution. The formation of vivianite is essential to the geochemical cycling of phosphorus and iron elements in natural environments. In this study, extracellular polymeric substances(EPS) were selected as the source of phosphorus. Microcosm experiments were conducted to test the evolution of mineralogy during the reduction of polyferric sulfate flocs(PFS) by Shewanella oneidensis MR-1(S. oneidensis MR-1) at EPS concentrations of 0, 0.03, and 0.3 g/L. vivianite was found to be the secondary mineral in EPS treatment when there was no phosphate in the media. The EPS DNA served as the phosphorus source and DNA-supplied phosphate could induce the formation of vivianite.EPS impedes PFS aggregation, contains redox proteins and stores electron shuttle, and thus greatly promotes the formation of minerals and enhances the reduction of Fe(Ⅲ). At EPS concentration of 0, 0.03, and 0.3 g/L, the produced HCl-extractable Fe(Ⅱ) was 107.9, 111.0,and 115.2 mg/L, respectively. However, when the microcosms remained unstirred, vivianite can be formed without the addition of EPS. In unstirred systems, the EPS secreted by S. oneidensis MR-1 could agglomerate at some areas, resulting in the formation of vivianite in the proximity of microbial cells. It was found that vivianite can be generated biogenetically by S. oneidensis MR-1 strain and EPS may play a key role in iron reduction and concentrating phosphorus in the oligotrophic ecosystems where quiescent conditions prevail.

关键词： vivianite Phosphorous Extracellular polymeric substances Polyferric flocs Shewanella oneidensis MR-1

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Effect of sodium alginate on phosphorus recovery by vivianite precipitation

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Journal of Environmental Sciences 2020年第7期32卷 164-169页

作者： Cong Zhang Dexiu Hu Ruijie Yang Zichen Liu State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China Xi’an University of TechnologyXi’an 710048China

There are good prospects for phosphorus recovery from excess sludge by vivianite crystallization while a large number of extracellular polymeric substances in sludge will have impact on vivianite precipitation.In this study,as a representative of extracellular polymeric substance,the effect of sodium alginate(SA)on phosphorus recovery by vivianite precipitation under different initial SA concentrations(0–800 mg/L),p H values(6.5–9.0)and Fe/P molar ratios(1:1–2.4:1)was investigated using synthetic wastewater.The results showed that SA in low concentrations(≤400 mg/L)had little inhibitory effect on the phosphorus recovery rate.However,when the concentration of SA was larger than 400 mg/L,the phosphorus recovery rate decreased significantly with increasing SA concentrations.The inhibition rate of 800 mg/L SA was about 3 times as large as that of 400 mg/L SA.It was worth noting that the inhibitory effect of SA on vivianite precipitation decreased with increasing initial p H and Fe/P molar ratios.Additionally,SA has no obvious influence on the composition of products,but the morphology of harvested crystals was transformed from branches to plates or rods in uneven sizes.

关键词： Phosphorus recovery Excess sludge vivianite Sodium alginate

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Evaluation of the Phosphate Raw Materials Potential of Amur Region

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地学前缘 2009年第S1期16卷 167-168页

作者： Varvara Kichanova Laboratory of Paleogeography and Nature Usage Institute of Geology and Nature Management

The Amur region,far east of Russia,is well endowed with phosphate in the forms of phosphorite, apatite,and vivianite.The 500-km2 Selitkansky phosphorite district has a proven reserve of ca.14.7 million tons（Mt） of P... 详细信息

关键词： resources of phosphate raw materials phosphorite apatite vivianite

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Enrichment of Phosphate on Ferrous Iron Phases during Bio-Reduction of Ferrihydrite

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International Journal of Geosciences 2012年第2期3卷 314-320页

作者： Qingman Li Xingxiang Wang Dan Kan Rebecca Bartlett Gilles Pinay Yu Ding Wei Ma Clinical Department School of Medicine Northwest University for Nationalities Lanzhou China Institute of Hydrobiology Chinese Academy of Sciences Wuhan China Institute of Soil Science Chinese Academy of Sciences Nanjing China School of Geography Earth and Environmental Sciences University of Birmingham Birmingham UK

The reduction of less stable ferric hydroxides and formation of ferrous phases is critical for the fate of phosphorus in anaerobic soils and sediments. The interaction between ferrous iron and phosphate was investigated experimentally during the reduction of synthetic ferrihydrite with natural organic materials as carbon source. Ferrihydrite was readily reduced by dissimilatory iron reducing bacteria (DIRB) with between 52% and 73% Fe(III) converted to Fe(II) after 31 days, higher than without DIRB. Formation of ferrous phases was linearly coupled to almost complete removal of both aqueous and exchangeable phosphate. Simple model calculations based on the incubation data suggested ferrous phases bound phosphate with a molar ratio of Fe(II):P between 1.14 - 2.25 or a capacity of 246 - 485 mg·P·g-1 Fe(II). XRD analysis indicated that the ratio of Fe(II): P was responsible for the precipitation of vivianite (Fe3(PO4)2·8H2O), a dominant Fe(II) phosphate mineral in incubation systems. When the ratio of Fe(II):P was more than 1.5, the precipitation of Fe(II) phosphate was soundly crystallized to vivianite. Thus, reduction of ferric iron provides a mechanism for the further removal of available phosphate via the production of ferrous phases, with anaerobic soils and sediments potentially exhibiting a higher capacity to bind phosphate than some aerobic systems.

关键词： Phosphate Iron Reduction Ferrihydrite Ferrous Iron vivianite

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