Water
·
2020
·Vol. 12
·期 4
·946
·
IF 2.544
Qiang Li,Song Wang,Lifang Wang,Li Zhang,Xiaohui Wan,Zhiguo Sun
Phosphorus recovery from industrial wastewater has attracted considerable interest. In this study, struvite crystallization method has been used for treatment of high phosphorus wastewater. The new combination agents of Mg5(CO3)4(OH)2·4H2O and NH4Cl were used as the precipitant. The effects of initial pH, n(Mg):n(P), n(N):n(P), and reaction time on the removal of total phosphorus (TP) in wastewater were investigated. The results showed that under the condition of initial pH = 4, Mg:N:P = 1.2:1.1:1, reaction time for 30 min, and static storage for 20 min, the residual amount of TP in wastewater was 2.98 mg /L, and the removal rate of TP reached 99.99%. The mass fraction of P2O5in the generated sediment reached 25.22%, equivalent to high grade phosphate ore and slow-release fertilizer, so as to realize the recycling and utilization of phosphorus in ultra-high phosphorous wastewater. This work will have practical application potential in treatment of high phosphorus wastewater and environmental management.Keywords:struvite crystallization method;environmental management;ultra-high phosphorus wastewater;basic magnesium carbonate;phosphorus recovery
研究领域:
环境工程
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废水处理
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资源回收
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产品关联
DOI
高影响因子
WASTE MANAGEMENT
·
2019
·
IF 5.431
Xiangdong Meng,Xiaoji Liu,Qunxing Huang,Huaping Gao,Kangrou Tay,Jianhua Yan
As a phosphorus-rich material, low-temperature combustion sewage sludge ash (LTCA) contains over 9 wt% content of phosphorus (P) and a large proportion of impurities, especially the content of Fe arrives at 14.59 wt%. To fully utilize LTCA as a fertilizer, this study investigated a procedure for P recovery from LTCA via struvite crystallization with fewer impurities. The adsorption characteristics of P and Fe by cation exchange resin (CER) were explored by simulating using the macroscopic parametric equation Thomas model. Optimum purification conditions for P-rich leachate by cation exchange column method were determined. Results showed that approximately 97.21 wt% of P was extracted from LTCA at HCl concentration of 0.8 M and liquid/solid ratio of 20.0 ml/g. More than 90 wt% of impurities could be detached by making P-rich leachate flow through cation exchange bed filled by CER at 300 ml/h. The macroscopic parametric equation Thomas model could clearly describe the adsorption characteristics of Fe in P-rich leachate by CER. Theoretical basis for purification of high concentration Fe in P-rich leachate by CER was provided. Approximately 84.04 wt% of total P in LTCA was recovered as struvite crystal which had low concentrations of heavy metals (5.96 mg/kg for Cr, 45.21 mg/kg for Cu, 29.67 mg/kg for Ni, 2.24 mg/kg for Pb, and 290.6 mg/kg for Zn) and could be eco-friendly for agricultural application. X-ray diffraction and SEM-EDS analysis validated the formation of struvite.
研究领域:
环境科学
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农业科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yu Tang,Pan Ran,Linjun Zhong,Haohong Liao,Qing Tong,Weixin Zou,Lin Dong
Electrochemically converting nitrate in wastewater as underleveraged nitrogen source into ammonia is a sustainable strategy for simultaneously valorizing wastewater and alleviating environmental contamination. However, it remains challenging for conversion of environmentally relevant nitrate in complex environments. Herein, a versatile IrCo alloy on N-doping carbon is presented with 93.3 % Faradaic efficiency and 21 mg h −1 mg cat −1 ammonia yield. Furthermore, we first achieve nearly complete nitrate removal (>99 %) under different pH conditions, from typical industrial wastewater concentrations (40 mM) to a drinking water standard (NO 3 – -N < 5 μg ml −1 ). Afterwards, high-value struvite (NH 4 MgPO 4 ·6H 2 O) products were obtained from the produced ammonia on a gram scale. DFT calculation reveals that optimized Co structure modulates the adsorption of intermediate *NH and facilitates further hydrogenation steps (*NH → *NH 2 ), whereas, limited on isolate Co sites due to weak H 2 O affinity and over-strong *H adsorption. The work gives effective insights into progressive ammonia production and environmental wastewater utilization.
研究领域:
环境科学
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化学工程
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材料科学
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电化学
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产品关联
DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2022
·
IF 13.716
Qing Jiang,Jia Liu,Xiangru Song,Ye Qiu,Jianliang Xue,Yuqiang Shao,Yujie Feng
Human urine contains abundant nutrients, while separately collecting urine can significantly alleviate nutrient loads in existing wastewater treatment facilities. Herein,0020a novel forward osmosis integrated bioelectro-concentration and recovery system (OsBCRS) was developed to recover nutrient ions from urine. NH 4 + and PO 4 3– migrated out from urine and enriched in the internal chamber of OsBCRS driven by the self-generated electric field, which were further concentrated by water extraction from the integrated forward osmosis (FO) process, and finally recovered as struvite. The current density of OsBCRS reached 27.3 A m –3 , which in turn drove the migration of NH 4 + -N (93.7 ± 1.6%) and PO 4 3– -P (94.6 ± 0.8%) out from urine, and these separated nutrients were enriched by 9.4–9.5 times in the internal chambers. Subsequently, these enriched nutrients in the catholyte were 3.2-fold concentrated with 68.6% of volume reduction by FO. The system removed up to 83.4% of NH 4 + -N and 88.8% of PO 4 3– -P, most of which were recovered as struvite taking advantage of reverse-fluxed Mg 2+ . The recovered struvite exhibited similar crystal structure and composition to that of standard struvite. The preliminary operating cost analysis of OsBCRS demonstrated that the revenue, including electricity generation and struvite recovery, could offset the operating cost. This study demonstrated highly efficient enrichment and recovery of nutrient ions from human urine by OsBCRS in a cost-effective way, and would encourage further exploration for nutrients recovery from wastes.
研究领域:
环境工程
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废水处理
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资源回收
✓ 已验证
产品关联
DOI
高影响因子
FIRE SAFETY JOURNAL
·
2025
·
IF 3.3
Lijing Wang,Shaowen Du,Sai Yao,Yibo Guo,Qi Yang,Haijun Zhang
Struvite (MgNH 4 PO 4 ·6H 2 O) exhibits strong fire-extinguishing properties due to its chemical structure, which resembles that of the widely used ammonium dihydrogen phosphate (ADP). The crystalline water within struvite contributes to its enhanced cooling effect. However, its relatively low pyrolysis temperature range (60 °C–300 °C) restricts its efficiency in high-temperature fires (e.g., 600 °C), where pure struvite struggles to penetrate the flame base. To overcome this limitation, a composite powder was developed by coating struvite with ammonium polyphosphate (APP), a compound known for its high thermal stability. Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and TGA-IR were used to investigate the fire-extinguishing mechanism. Results showed that the incorporation of APP extended the thermal decomposition range of struvite, with the 15 wt% APP composite demonstrating optimal performance. This composite exhibited a multifaceted fire-extinguishing action: releasing water vapor for cooling, ammonia for flame suppression, and solid residues that formed a protective layer to isolate the flame from the fuel. Consequently, the composite powder demonstrated superior fire-extinguishing performance, outperforming traditional ADP powder in oil pool fire tests, demonstrating its potential for practical fire suppression applications.
研究领域:
材料科学
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消防工程
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无机化学
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热力学
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安全工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhenwei Lu,Keqiang Zhang,Fuyuan Liu,Xingliang Gao,Zhongwei Zhai,Jiajia Li,Lianzhu Du
Currently, the closure of the nutrient circular loop and contaminant removal from wastewater are drawing widespread attention. In this study, a novel MgO/iron oxide-modified NaY zeolite (MNZ) was prepared and used for the integration of adsorption and struvite precipitation to simultaneously reclaim ammonium and phosphate from wastewater. The results proved that MgO and iron oxide nanoparticles were successfully embedded in the zeolite matrix, providing high adsorption performance for ammonium and phosphate, reaching 380.02 (as NH + 4) and 324.68 (as P T ) mg/g, respectively. The presence of NO 3 − , Cl − , SO 4 2− , and HCO 3 − did not significantly influence the adsorption of ammonium and phosphate. Struvite precipitation on the MNZ surface is the primary mechanism for the recovery of both ammonium and phosphate with electrostatic attraction and ion exchange also involved in ammonium uptake. These results indicate that optimized MNZ is promising for nutrient recovery from wastewater because of its high selectivity for targeted absorbates and its potential application as a slow-release eco-fertilizer.
研究领域:
环境工程
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水处理
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材料科学
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废物管理
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Yonghao Tan,Zhemin Zou,Jun Qu,Jie Ren,Chenjie Wu,Zhigao Xu
Chrysotile asbestos tailing (CAT) are rich in magnesium and silicon which are of great value for crop growth. In this work, CAT was transformed to struvite and silicate salt for the first time by one-step milling with phosphates (NH 4 H 2 PO 4 , (NH 4 ) 2 HPO 4, KH 2 PO 4 and CaHPO 4 ) for full elements utilization as citric acid soluble fertilizer (CASF). The X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TG) and Scanning electron microscopy (SEM) were used to characterize the obtained samples. The nutrients release data revealed that CAT milling with (NH 4 ) 2 HPO 4 and CaHPO 4 was optimal for the production of Mg, N, P, and Si compound CASF which released 0% Mg, 9.37% N, 2.02% P, and 9.86% Si in water and 94.54% Mg, 96.79% N, 96.97% P, and 14.02% Si in 2% citric acid. The prepared product held the nutrients by the mechanism of struvite crystallization in water and released the nutrients by acid-dissolution in citric acid solution. Techno-economic analysis proved the feasibility and economic value of the CASF produced by the proposed mechanochemical approach. This facile and environmentally friendly process would surely contribute to the improvement of resource utilization efficiency and create a sustainable and environmental friendly agricultural production system.
研究领域:
环境科学
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农业科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yu Tao,Baogang Yang,Fengyan Wang,Yanghao Yan,Xianyong Hong,Haihua Xu,Mingzhu Xia,Fengyun Wang
In this work, a facile and green method is applied to synthesize hydrophilic MOF-808(Zr) and modulate its defect content and particle size using different amounts of iron nitrate (denoted as F) to obtain serial XF-MOF-808 (“X” implied the dosage of used F). The development of additional adsorption sites and the fine-tune of pore and particle size based on MOF-808 significantly improved phosphate adsorption performance. In particular, the 0.5F-MOF-808 shows excellent adsorption capacity (305.5 mg/g) and rapid diffusion rate (37.51 mg/g·min 0.5 ) for phosphate at 298 K and initial pH = 6.5, outperforming pristine MOF-808 and most previously reported adsorbents. 0.5F-MOF-808 possesses a wide pH tolerance, outstanding reusability and excellent selectivity for phosphate adsorption from simulated wastewater, verified in environmental implication and regeneration experiments. Phosphate loaded on the adsorbent can be converted to struvite for agricultural fertilizer via a simple crystallization process. Compared to MOF-808, the exceptional sorption performance of 0.5F-MOF-808 is supported by decreased internal diffusion limitation, enlarged pore size and the development of new adsorption sites, which can be proved by advanced characterizations and batch adsorption experiments. This work presents a promising modification strategy of MOF materials for phosphate adsorption and recovery.
研究领域:
环境科学
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材料科学
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水处理
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可持续化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Lucheng Li,Jie Ni,Zehua Zhu,Xiaojun Zuo
A novel Mg-loaded chitosan carbonized microsphere (MCCM) was prepared for simultaneous adsorption of ammonium and phosphate in this study, through the investigation of preparation procedures, addition ratio, and preparation temperature. Pollutants removals by MCCM were more acceptable with 64.71% for ammonium and 99.26% for phosphorus, compared with chitosan carbonized microspheres (CCM), Mg-loaded chitosan hydrogel beads (MCH) and MgCl 2 ·6H 2 O. Addition ratio of 0.6:1 (m chitosan : m MgCl2 ) and preparation temperature of 400 °C in MCCM preparation were responsible for pollutant removal and yield. The effect analysis of MCCM dosage, solution pH, pollutant concentration , adsorption mode and coexisting ions on the removal for both ammonium and phosphate indicated that pollutants removals were increased with increasing MCCM dosages, and achieved the peak at pH 8.5, but presented to be stable with Na + , K + , Ca 2+ , Cl − , NO 3 − , CO 3 2− and SO 4 2− , except for Fe 3+ .Adsorption mechanisms discussion implied that simultaneous ammonium and phosphate removal with MCCM was attributed to struvite precipitation, ion exchange, hydrogen bonding, electrostatic attraction and Mg–P complexation, suggesting that MCCM presents a new way for simultaneous concentrated ammonium and phosphate removal in wastewater treatment .
研究领域:
环境科学
·
水处理
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Guangyuan Chen,Tong Zhou,Meng Zhang,Zhongxiang Ding,Zhikun Zhou,Yuanhui Ji,Haiying Tang,Changsong Wang
Struvite (MAP) crystallization technology is widely used to treat ammonia nitrogen in waste effluents of its simple operation and good removal efficiency. However, the presence of heavy metal ions in the waste effluents causes problems such as slow crystallization rate and small crystal size, limiting the recovery rate and economic value of the MAP. The present study was conducted to investigate the effects of concentrations of three heavy metal ions (Cu 2+ , Zn 2+ , and Pb 2+ ) on the crystal morphology, crystal size, average growth rate, and crystallization kinetics of MAP. A relationship was established between the kinetic rate constant K t calculated by the chemical gradient model and the concentrations of heavy metal ions. The results showed that low concentrations of heavy metal ions in the solution created pits on the MAP surface, and high level of heavy metal ions generated flocs on the MAP surface, which were composed of metal hydroxides, thus inhibiting crystal growth. The crystal size, average growth rate, MAP crystallization rate, and kinetic rate constant K t decreased with the increase in heavy metal ion concentration. Moreover, the K t demonstrated a linear relationship with the heavy metal concentration ln( C / C* ), which provided a reference for the optimization of the MAP crystallization process in the presence of heavy metal ions.
研究领域:
环境科学
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化学工程
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水处理
✓ 已验证
产品关联
DOI
高影响因子
PLoS One
·
2025
·Vol. 20
·期 8
·e0331575
·
IF 2.6
Yu Jin,Haifeng Wu,Shuai Huo,Siyu Chen,Lili Shen,Hongjie Di,Lianfeng Du,Peng Li
Livestock and poultry farming effluents (LPFE) have become a significant source of pollution in the agricultural water environment, with nitrogen (N) and phosphorus (P) being the major pollutants. The use of inexpensive Mg2 + -modified materials as crystallization carriers can enhance the struvite crystallization and precipitation reaction, enabling efficient recovery of N and P nutrients from LPFE. In this study, Mg2 + -modified corncob biochar (CCBC-Mg) and Mg2 + -modified natural zeolite (NZ-Mg) were assessed for their simultaneous recovery of N and P from LPFE. BET, SEM-EDS, FTIR, XRD and adsorption isotherm and adsorption kinetics modelling were used to study the N and P adsorption properties and mechanisms. The results showed that Mg2 + modification significantly enhanced the simultaneous ammonia nitrogen (AN) and total phosphorus (TP) recovery of the two materials. After modification, corncob biochar (CCBC-Mg) showed the best P recovery performance, while natural zeolite (NZ-Mg) showed the best AN recovery, with adsorption quantities reaching 116.99 mg/g and 47.50 mg/g, respectively. The findings demonstrated that the adsorption processes for both AN and phosphate across all materials adhered to the pseudo-second-order kinetic model and Langmuir isotherm, collectively indicating that monolayer adsorption governed by chemical interactions was the predominant mechanism. CCBC and NZ mainly adsorbed AN and TP by electrostatic attraction and ion exchange, whereas CCBC-Mg and NZ-Mg, mainly relied on struvite precipitation on the material surface. The Mg2 + - modification increased the solution pH and formed Mg-P precipitates on the material surface, providing a favourable alkaline environment and nucleation conditions for the struvite reaction, thereby promoting the simultaneous recovery of AN and TP by the materials. This study could provide a theoretical basis for the design of struvite carrier for the simultaneous recovery of AN and TP from LPFE by the struvite precipitation method, and promote the application of this process in livestock and poultry farming effluent treatments.
研究领域:
环境科学
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农业工程
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水处理
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材料科学
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污染控制
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Menghui Yao,Bingzhi Yi,Lingyu Wang,Jiahao Wei,Yanyu Ma,Ling Zhou,Mingyang Chen,Junbo Gong
Phosphorus (P) recovery from wastewater as struvite not only alleviates global P resource shortages but also prevents water eutrophication caused by wastewater discharge. This study presents a sodium dodecyl benzene sulfonate (SDBS)-assisted struvite crystallization method (SASC method) to recover P as the struvite crystalline microspheres with uniform particle size (27.51 ± 3.60 μm), high sphericity (roundness = 0.91 ± 0.04), and good dispersibility (no aggregation) under various operating conditions with different N/P/Mg molar ratios and magnesium sources. Mechanism of microsphere formation and the regulation of modifier type and process parameters (SDBS concentration, initial pH, and stirring rate) on microsphere formation are explored in detail to realize the controllable fabrication of microspheres. Compared with common struvite crystals, microspheres have more outstanding performance in multiple applications. Specifically, microspheres have improved powder properties including bulk density and fluidity, better slow-release fertilizer performance, that is, slower dissolution in water and soil, and the ability to prepare superior mesoporous phosphate materials with better macroscopic morphology and higher loading capacity. Thus, this study markedly improves the multiple application performance of struvite by designing and controlling the product morphology based on its simplicity and efficiency. These provide new insights into recovering P in the form of struvite with excellent quality, thereby enhancing the economic value of the recycled products of P recovery from wastewater
研究领域:
环境科学
·
化学工程
·
废物管理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）