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A new strategy for obtaining highly concentrated phosphorus recovery solution in biofilm phosphorus recovery process

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Journal of Environmental Sciences 2022年第2期34卷 366-375页

作者： Wanjing Yang Jie Shan Yang Pan Zhen Bi Yong Huang Hao Zhang Min Ni School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China National&Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology Suzhou University of Science and TechnologySuzhou 215009China

recovery of phosphorus(P)from wastewater is of great significance for alleviating the shortage of P resources.At present,the P recovery process is faced with the problem of excessive organic carbon consumption when obtaining a P-concentrated recovery solution.This study proposed a new strategy to obtain a more highly concentrated P recovery solution with minimal carbon consumption by strengthening the P storage capacity of the biofilm.A biofilm sequencing batch reactor(BSBR)process was modified to treat synthetic wastewater.The effect of the dissolved oxygen(DO)concentration on the P storage capacity of the biofilm was investigated at DO concentrations of DO 3.5 mg/L(P_(L))and DO 6.5 mg/L(P_(H)).The results showed a maximum P storage of 101.2 and 149.6 mg-P/g-mixed liquid suspended solids under the two conditions.Strengthening the P storage capacity of the biofilm resulted in a net increase in the P recovery rate,which was as high as 66.96%in a harvesting cycle,and total soluble P>220 mg/L in the P recovery solution was successfully achieved.Meanwhile,the carbon cost of P recovery in the BSBR was reduced to 41.57 g-chemical oxygen demand/gP,and the carbon utilization efficiency was enhanced.To highlight the new strategy,the P recovery performance of the BSBR was given and the relationship between P content and anaerobic P release was discussed.In addition,the changes in the microbial communities under P_(L) and P_(H) conditions were analyzed.

关键词： Biofilm sequencing batch reactor phosphorus storage capacity phosphorus release phosphorus recovery

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Effect of saline water ionic strength on phosphorus recovery from synthetic swine wastewater

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Journal of Environmental Sciences 2022年第3期34卷 81-91页

作者： Zhipeng Zhang Bing Li Filicia Wicaksana Wei Yu Brent Young Department of Chemical&Materials Engineering University of AucklandAuckland 1010New Zealand

Declining worldwide phosphate rock reserves has driven a growing interest in exploration of alternative phosphate supplies. This study involved phosphorus recovery from swine wastewater through precipitation of struvite, a valuable slow-release fertiliser. The economic feasibility of this process is highly dependent on the cost of magnesium source. Two different magnesium sources were used for phosphorus recovery: pure magnesium chloride and nanofiltration(NF) saline water retentate. The paper focuses on the impact of ionic strength on phosphorus recovery performance that has not been reported elsewhere. Experimental design with five numerical variables(Mg/P molar ratio, pH, PO_(4)^(3-)-P, NH_(4)^(+)-N, and Ca^(2+) levels) and one categorical variable(type of magnesium source) was used to evaluate the effect of ionic strength on phosphorus removal and struvite purity. The experimental data were analysed using analysis of variance(ANOVA) and principal component analysis(PCA). Results indicated that a magnesium source obtained from NF retentate was as effective as MgCl_(2) for struvite precipitation. It was also revealed that ionic strength had a more positive effect on struvite purity than on phosphorus removal. Within the range of parameters studied in this research, high ionic strength, high p H and wastewater with high phosphate, high ammonium and low calcium contents were found to be the most favourable conditions for struvite precipitation. Findings from this study will be beneficial to determine the feasibility of using high ionic strength saline water, such as NF seawater retentate, as a magnesium source for phosphorus recovery from wastewater that is rich in ammoniumnitrogen and phosphate.

关键词： phosphorus recovery Struvite Ionic strength Wastewater Nanofiltration retentate

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Influence of temperature and Fe_(2)O_(3)on phosphorus recovery from dephosphorization slag by reduction

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Journal of Iron and Steel Research(International) 2023年第4期30卷 697-707页

作者： Sai He Lu Lin Ya-qin Liu Zhong-xiao Hou Yan Lv Wei Wu Metallurgical Technology Research Institute Central Iron and Steel Research Institute Co.Ltd.Beijing 100081China

The reduction and recovery of P_(2)O_(5)in dephosphorization slag were examined to establish a new recycling process for dephosphorization slag.The dephosphorization slag is obtained from the dephosphorization furnace in the duplex converter process,and the content of P_(2)O_(5) in the dephosphorization slag can reach 9 wt.%.The dephosphorization slag is considered to be a prospective resource of phosphorus due to its high content of P_(2)O_(5).To explore the effects of temperature and Fe2O3 content in slag on phosphorus recovery from dephosphorization slag,the experimental slag was reduced by carbon powder in a resistance furnace.The results show that the temperature and content of Fe2O3 in slag have a significant effect on the reduction in P_(2)O_(5),and the reduction and recovery ratios of P_(2)O_(5) in slags increase with the increase in the experimental temperature and content of Fe_(2)O_(3),reaching 94.41%and 83.09%,respectively.It has been indicated that phosphorus recovery from dephosphorization slag using carbothermic reduction has significant environmental and economic benefits.

关键词： Dephosphorization slag phosphorus recovery Carbothermic reduction P_(2)O_(5)

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phosphorus recovery from wastewater by struvite crystallization:Property of aggregates

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Journal of Environmental Sciences 2014年第5期26卷 991-1000页

作者： Zhilong Ye Yin Shen Xin Ye Zhaoji Zhang Shaohua Chen Jianwen Shi Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences

Struvite crystallization is a promising method to remove and recover phosphorus from wastewater to ease both the scarcity of phosphorus rock resources and water eutrophication worldwide. To date, although various kinds of reactor systems have been developed, supporting methods are required to control the stmvite fines flushing out of the reactors. As an intrinsic property, aggregation is normally disregarded in the struvite crystallization process, although it is the key factor in final particle size and therefore guarantees phosphorus recovery efficiency. The present study developed a method to analyze the characteristics of struvite aggregates using fractal geometry, and the influence of operational parameters on struvite aggregation was evaluated. Due to its typical orthorhombic molecular structure, struvite particles are prone to crystallize into needle or rod shapes, and aggregate at the comers or edges of crystals. The determined fractal dimension （Dpf） of struvite aggregates was 1.52-1.31, with the corresponding range of equivalent diameter （d0.5） at 295.9-85.4 Ixm. Aggregates formed in relatively low phosphorus concentrations （3.0-5.0 mmol/L） and mildly alkaline conditions （pH 9.0-9.5） displayed relatively compact structures, large aggregate sizes and high aggregation strength. Increasing pH values led to continuous decrease of aggregate sizes, while the variation of Dpf was insignificant. As to the aggregate evolution, fast growth in a short time followed by a long steady stage was observed.

关键词： struvite aggregate fractal dimension phosphorus recovery image analysis

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phosphorus recovery from municipal and fertilizer wastewater:China's potential and perspective

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Journal of Environmental Sciences 2017年第2期29卷 151-159页

作者： Kuangxin Zhou Matthias Barjenbruch Christian Kabbe Goulven Inial Christian Remy Berlin Centre of Competence for Water Berlin 10709Germany Department of Urban Water Management Technical University of BerlinBerlin 13355Germany Research&Innovation Asia Veolia EnvironmentBeijing 10004China

phosphorus（P） is a limited resource, which can neither be synthesized nor substituted in its essential functions as nutrient. Currently explored and economically feasible global reserves may be depleted within generations. China is the largest phosphate fertilizer producing and consuming country in the world. China’s municipal wastewater contains up to 293,163 Mg year of phosphorus, which equals approximately 5.5% of the chemical fertilizer phosphorus consumed in China. phosphorus in wastewater can be seen not only as a source of pollution to be reduced, but also as a limited resource to be recovered. Based upon existing phosphorus-recovery technologies and the current wastewater infrastructure in China, three options for phosphorus recovery from sewage sludge, sludge ash and the fertilizer industry were analyzed according to the specific conditions in China.

关键词： phosphorus recovery Municipal Wastewater Fertilizer Industry Sewage sludge China

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Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

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Biochar 2022年第1期4卷 518-532页

作者： Yueru Fang Amjad Ali Yuxi Gao Peng Zhao Ronghua Li Xianxian Li Junxi Liu Yuan Luo Yaru Peng Hailong Wang Hongbin Liu Zengqiang Zhang Junting Pan College of Natural Resources and Environment Northwest A&F UniversityYanglingXianyang 712100ShaanxiChina School of Environmental and Municipal Engineering Shaanxi Key Laboratory of Environmental EngineeringXi’an University of Architecture and TechnologyXi’an 710055China Biochar Engineering Technology Research Center of Guangdong Province School of Environmental and Chemical EngineeringFoshan UniversityFoshan 528000GuangdongChina Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081China

Conversion of organic waste into engineered metal-biochar composite is an effective way of enhancing biochar’s efficiency for adsorptive capture of phosphorus(P)from aqueous media.Thus,various strategies have been created for the production of metal-biochar composites;however,the complex preparation steps,high-cost metal salt reagent application,or extreme process equipment requirements involved in those strategies limited the large-scale production of metal-biochar composites.In this study,a novel biochar composite rich in magnesium oxides(MFBC)was directly produced through co-pyrolysis of magnesite with food waste;the product,MFBC was used to adsorptively capture P from solution and bio-liquid wastewater.The results showed that compared to the pristine food waste biochar,MFBC was a uniformly hybrid MgO biochar composite with a P capture capacity of 523.91 mg/g.The capture of P by MFBC was fitted using the Langmuir and pseudo-first-order kinetic models.The P adsorptive capture was controlled by MgHPO4 formation and electrostatic attraction,which was affected by the coexisting F−and CO_(3)^(2−)ions.MFBC could recover more than 98%of P from the solution and bio-liquid wastewater.Although the P-adsorbed MFBC showed very limited reusability but it can be substituted for phosphate fertiliser in agricultural practices.This study provided an innovative technology for preparing MgO-biochar composite against P recovery from aqueous media,and also highlighted high-value-added approaches for resource utilization of bio-liquid wastewater and food waste.

关键词： Biochar Bio-liquid wastewater Fertiliser Magnesite phosphorus recovery

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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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recovery of phosphorus as struvite from sewage sludge ash

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Journal of Environmental Sciences 2012年第8期24卷 1533-1538页

作者： Huacheng Xu Pinjing He Weimei Gu Guanzhao Wang Liming Shao State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China

phosphorus （P） is an element vital for all living organisms, yet the world＇s reserves of phosphate rock are becoming depleted. This study investigated an effective P recovery method from sludge ash via struvite precipitation. Results showed that more than 95% of the total P content was extracted from sludge ash by applying 0.5 mol/L HC1 at a liquid/solid ratio of 50 mL/g. Although heavy metal leaching also occurred during P extraction, cation exchange resin efticiently removed the heavy metals from the P-rich solution. Orthogonal tests showed that the optimal parameters for P precipitation as struvite would be a Mg：N：P molar ratio of 1.6：1.6：1 at pH 10.0. X-ray diffraction analysis validated the formation of struvite. Further investigations revealed that the harvested precipitate had a high struvite content （97%）, high P bioavailability （94%）, and low heavy metal content, which could be considered a high quality fertilizer.

关键词： phosphorus recovery heavy metal sewage sludge ash struvite X-ray diffraction

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Cell surface-expression of the phosphate-binding protein PstS:System development,characterization,and evaluation for phosphorus removal and recovery

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Journal of Environmental Sciences 2020年第6期32卷 129-140页

作者： Faten B.Hussein Kaushik Venkiteshwaran Brooke K.Mayer Department of Civil Construction and Environmental EngineeringMarquette UniversityMilwaukeeWI53233USA

Simultaneous overabundance and scarcity of inorganic phosphate(Pi)is a critical issue driving the development of innovative water/wastewater treatment technologies that not only facilitate Pi removal to prevent eutrophication,but also recover Pi for agricultural reuse.Here,a cell-surface expressed high-affinity phosphate binding protein(PstS)system was developed,and its Pi capture and release potential was evaluated.E.coli was genetically modified to express PstS on its outer membrane using the ice nucleation protein(INP)as an anchoring motif.Verification of protein expression and localization were performed utilizing SDS-polyacrylamide gel electrophoresis(SDS-PAGE),western blot,and outer membrane separation analyses.Cell surface characterization was investigated through acid-base titration,X-ray photoelectron spectroscopy(XPS),and Fourier transform infrared spectroscopy(FTIR).These tests provided information on the macromolecular structure and composition of the bacteria surface as well as the proton-exchange properties of the surface functional groups(i.e.,pKa values).Phosphate desorption and adsorption batch experiments were conducted to evaluate the effects of temperature,pH,and ionic strength on phosphate capture and release.The PstS surface-displayed cells demonstrated greater potential to release and capture phosphate compared to non-modified cells.Higher temperatures up to 40℃,basic pH conditions(pH=10.5),and higher ionic strength up to 1.0 mol/L KCl promoted 20%-50%higher phosphate release.

关键词： phosphorus recovery Water treatment Eutrophication Surface-expression PstS protein E.coli bacteria Phosphate

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Seed selections for crystallization of calcium phosphate for phosphorus recovery

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Journal of Environmental Sciences 2007年第5期19卷 591-595页

作者： SONG Yong-hui Dietfried DONNERT Ute BERG Peter G. WEIDLER Rolf NUEESCH Chinese Research Academy of Environmental Sciences Beijing 100012 China Institute for Technical Chemistry-Section of Water- and Geo-technology （ITC-WGT） Research Centre of Karlsruhe Karlsruhe D-76021 Germany

Seed induces and promotes the crystallization of calcium phosphate, and acts as carrier of the recovered phosphorus （P）. In order to select suitable seed for P recovery from wastewater, three seeds including Apatite （AP）, Juraperle （JP） and phosphate-modified Juraperle （M-JP） were tested and compared. Batch and fixed-bed column experiments of seeded crystallization of calcium phosphate were undertaken by using synthetic wastewater with 10 mg/L P phosphate. It shows that AP has bad enduring property in the crystallization process, while JP has better performance for multiple uses, and M-JP is a hopeful seed for P recovery by crystallization of calcium phosphate.

关键词： crystallization seed phosphorus recovery Juraperle Apatite

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