Sustainability
·
2022
·Vol. 14
·期 14
·8690
·
IF 3.889
Yuan Liu,Jie Jin,Jiawei Li,Ziwei Zou,Renchan Lei,Jintao Sun,Jinxia Xia
Sustainable phosphorus (P) recovery from sewage sludge is crucial to reconciling the simultaneous shortage and excess of P. In this study, magnetic biochar (MBC) was synthesized and innovatively applied to enhance P recovery as vivianite. The effects of anaerobic digestion (AD) time, hydrothermal (HT) pretreatment temperature and MBC dose on vivianite formation were investigated using batch experiments and a modified sequential P extraction protocol. The P fractionation results showed that the concentration of pure vivianite-bound P (Fe(II)-P) reached a maximum on the 10th day of AD treatment, and then declined sharply due to vivianite oxidation and P limitation. HT pretreatment operated at relatively high temperatures (135 and 185 °C) reduced vivianite formation; this negative effect of HT pretreatment was partially compensated by MBC supplementation. The proportion of Fe(II)-P in the solid phase of sludge was substantially raised up to 57.1% from 8.3~17.4% with an increasing dose of MBC from 0 to 12.5 g/L, indicating that MBC had a markedly enhanced effect on vivianite formation; this could be attributed to the MBC-improved Fe(II) production, as evidenced by the elevated proportion of Fe(II) in Fe2p XPS spectra and the increased ratio of Fe(II)-P to oxidized vivianite-bound P (Fe(III)-P) in the sludge after MBC supplementation. MBC addition also decreased the proportion of water-extractable P by sorption and promoted organic P decomposition, which further facilitated vivianite production. These findings reveal a new strategy for enhancing P recovery from HT-pretreated AD sludge.Keywords:vivianite;sewage sludge;P recovery;biochar;HT-AD
研究领域:
环境科学
·
废物管理
·
资源回收
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Hugang Li,Hongxu Chen,Yongfei Gao,Yuhong Qin,Shuai Niu,Hui Zhou,Yuanhui Zhang
Crystallization of vivianite-phosphorus is a promising method to recover phosphate as a vital resource from sewage sludge hydrothermal carbonization (HTC) products. This study reveals the in-situ recrystallization mechanism of vivianite-phosphorus (Fe 3 (PO 4 ) 2 ·8H 2 O) regulated by FeCl 3 -assisted HTC in depth. The key finding includes the decipherment that phosphorus is mainly enriched in hydrochar (72.7 ± 2.9 %wt ∼ 84.4 ± 3.31 %wt). Further identified by HRTEM and XRD, dominant phosphorus is profiled as vivianite (Fe 3 (PO 4 ) 2 ·8H 2 O) with very few calcium phosphate crystals (Ca 3 (PO 4 ) 2 ) formation in hydrochar at near-neutral condition. Under acidic conditions, HMF oxidation triggers reductive dissolution of surface-bound Fe(III)-phosphate complexes, releasing Fe 2+ , HPO 4 2− , and PO 4 3− . The anoxic, reducing conditions at circumneutral pH created by HTC, combining with favorable Fe: P ratio (1.72) and lower calcium concentration (532 mg L −1 ), comprehensively drives the crystallization of Fe 3 (PO 4 ) 2 ·8H 2 O. This demonstration-of-practice study provides deep insights into dual organic waste resource and energy valorization.
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Jifei Chang,Nanqi Ren,Qing Yuan,Shu Wang,Danhui Liang,Zexuan He,Xin Wang,Nan Li
Vivianite as a significant secondary mineral of dissimilatory iron reduction (DIR) exhibits marvelous potential to solve eutrophication as well as phosphorus shortage. Geobattery represents by natural organic matters (NOM) with rich functional groups influences bioreduction of natural iron mineral. Activated carbon (AC) which contains abundant functional groups is expected to serve as geobattery, but there remains insufficient understanding on its geobattery mechanism and how it benefits the vivianite formation. In this study, the charging and discharging cycle of “geobattery” AC enhanced extracellular electron transfer (EET) and vivianite recovery was demonstrated. Feeding with ferric citrate, AC addition increased vivianite formation efficiency by 141 %. The enhancement was attributed to the electron shuttle capacity of storage battery AC, which was contributed by the redox cycle between C O and O–H. Feeding with iron oxides , huge gap of redox potential between AC and Fe(III) minerals broke through the reduction energy barrier. Therefore the iron reduction efficiency of four Fe(III) minerals was accelerated to the same high level around 80 %, and the vivianite formation efficiency were increased by 104 %–256 % in pure culture batches. Except acting as storage battery, AC as a dry cell contributed 80 % to the whole enhancement towards iron reduction, in which O–H groups were the dominant driver. Due to the rechargeable nature and considerable electron exchange capacity, AC served as geobattery playing the role of both storage battery and dry cell on electron storaging and transferring to influence biogeochemical Fe cycle and vivianite recovery.
研究领域:
环境科学
·
微生物学
·
地球化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Shu Wang,Nanqi Ren,Danhui Liang,Jifei Chang,Xin Wang,Jiaguo Yan,Xiang Cheng,Lili Dong,Nan Li
Vivianite is an important bio-induced product of dissimilated iron reduction (DIR), which exists widely in activated sludge and digested sludge of wastewater treatment plants (WWTPs). Extracellular polymeric substances (EPS) surrounding dissimilatory iron-reducing bacteria (DIRB) were reported to be transient media for microbial extracellular electron transfer (EET) and DIR. However, what happens when a layer of EPS envelops microbial cells during vivianite recovery? This study tried to assess the relationship between iron reduction and electron transfer by stripping EPS layer-by-layer, then clarified the delamination of different EPS layers on the performance of vivianite recovery. After stripping total EPS (PC-EPS batches) of DIRB, the Fe (III) reduction efficiencies ( R Fe ), Fe (III) reduction rate ( V Fe ), and vivianite formation efficiency ( R V ) decreased by 33%, 37%, and 30%, respectively. Tightly bound-EPS (TB-EPS) was confirmed to play a crucial role in vivianite formation, which contributed 28–51% to vivianite recovery and 34–55% to iron reduction. Electronic shuttle substances were contained in TB-EPS, which enhanced the EET rate and efficiency between cells and Fe (III). The polysaccharide content of TB-EPS was positively related to adhesiveness between cells and mineral, as well as the iron reduction efficiency. Furthermore, redox proteins (PpcA, OmcB) were embedded in EPS, which shortened the distance of electron hopping to across the EPS layer and further accelerated vivianite recovery from wastewater. Long-term operation of anaerobic reactors confirmed that TB-EPS played critical roles in bio-induced vivianite formation.
研究领域:
环境科学
·
微生物学
·
污水处理
·
生物地球化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shi-Xu Wang,Yun-Xin Huang,Hao Wang,Yao-Yao Lu,Wen-Long He,Jing Li,Nian-Si Fan,Bao-Cheng Huang,Ren-Cun Jin
Exploiting phosphorus resources from waste streams such as municipal wastewater is essential for their recycling and utilization. However, common practice on phosphorus recovery via main-stream biological phosphorus removal and side-stream phosphorus precipitation still faces great challenges such as organic mineralization induced CO 2 emission and aeration caused energy consumption. In this work, ferrihydrite and magnetite were respectively dosed into bioflocculation organic carbon capture system to comprehensively evaluate their potential improvements on phosphorus recovery from municipal wastewater. Results showed that ferrihydrite would outcompete magnetite on phosphorus capture, by increasing TP removal efficiency from 17.5% to 91.2% while maintaining a high organic carbon capture efficiency of about 50%. Although both iron minerals were favored for improving sludge settling performance, the potential toxicity of magnetite was higher than that of ferrihydrite. Chemical precipitation and adsorption are the main pathways for phosphorus removal by iron minerals. Subsequent anaerobic fermentation showed that ferrihydrite bounded phosphorus was mainly transformed to vivianite while magnetite captured phosphorus was released into the liquid. Surprisingly, ferrihydrite was favored for the volatile fatty acids rather than biogas production, with an average yield of 523.2 mg/g volatile suspended solids. This work might be valuable for exploring a more sustainable value-added resource recovery paradigm.
研究领域:
环境工程
·
污水处理
·
资源回收
✓ 已验证
DOI
高影响因子
Chemical and Biological Technologies in Agriculture
·
2025
·Vol. 12
·期 1
·1-14
·
IF 5.2
Sha Muzhi,Wang Yunlong,Diao Junpeng,Savaldi-Goldstein Sigal,Wang Qian
Background Vivianite is an intensively studied phosphorus (P) recovery product from wastewater treatment plants. However, its downstream application has not been well-addressed thus restricting P cycling. This study investigated the P fertilizer efficiency of vivianite in pot experiments using ryegrass ( Lolium multiflorum L.) and tomato ( Solanum lycopersicum L.) with two soilless growing media (perlite and quartz). The variation of vivianite during fertilization was examined to elucidate the mechanisms of P release from vivianite, using a recently developed sequential P extraction protocol coupled with light microscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). Results The mineral fertilizer equivalence (MFE) of vivianite was determined by comparing the P uptake by plants under vivianite treatment to that under mineral P fertilizer treatment, i.e., Ca(H 2 PO 4 ) 2 in this study. It shows that the vivianite-P uptake of ryegrass was positively correlated with time in a 3-month period and its uptake in quartz was faster than that in perlite, leading to a higher MFE of vivianite in quartz than in perlite (15.8–20.3% vs 6.6–7.4%). This should be attributed to the higher P adsorption capacity and lower hydraulic conductivity of perlite, which restricted the vivianite-P dissolution and mobility. The vivianite variation revealed that vivianite-P was mainly released upon vivianite oxidation to ferric (hydr)oxides in perlite, probably given the high aeration condition in this type of growing medium. In quartz, however, the release of vivianite-P was most likely due to vivianite dissolution driven by the plant uptake of P, during which a higher plant uptake of Fe was observed than that in perlite. Conclusions The findings reveal that vivianite can serve as a slow-release P fertilizer, and its fertilizer efficiency is highly related to the properties of the growing media. Quartz is a preferred growing medium over perlite for the efficient fertilization of this sparingly soluble P source. The findings deepen the understanding of P fertilization of vivianite and lay foundation to its utilization as a slow-release P fertilizer for a circular economy of P. Graphical
研究领域:
农学
·
土壤学
·
环境科学
·
植物营养
·
肥料技术
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Kexin Lu,Qian Ping,Qinyuan Lu,Yongmei Li
Effects of fulvic acid (FA) and bovine serum albumin (BSA) on the transformation of ferric phosphate (FePO 4 ) during anaerobic fermentation of waste activated sludge were investigated. Both FA and BSA promoted phosphorus (P) release from FePO 4 . A higher P release efficiency was achieved with FA addition compared with BSA at the same dose although BSA promoted iron (Fe) reduction more effectively. Both FA and BSA contributed to the enrichment of vivianite but hindered P re-precipitation with other ions, and FA affected more significantly. Microbial analysis revealed that FA contributed to the enrichment of iron-reducing bacteria (IRB) transporting electrons indirectly and increased the bioavailable Fe(III) via siderophores; BSA provided more electron donors, thereby enriched IRB transferring electrons directly to Fe(III). This study provides an in-depth understanding of Fe and P transformations in sludge bearing iron-phosphorus compounds and it is of practical value for P recovery as vivianite.
研究领域:
环境科学
·
微生物学
·
废物管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Waste and Biomass Valorization
·
2025
·
IF 2.8
Wang Xianhong,Li Weihua,Ma Shaoyang,Yang Tingting,Chen Zhihao,Liu Yixin,Xue Tongzhan,Dong Bo
This study investigated phosphorus release, iron reduction, and the generation of volatile fatty acids (VFAs) during the anaerobic co-fermentation of waste activated sludge (WAS) and starchy food waste (SFW). Meanwhile, the formation of vivianite crystals was compared between two different iron sources: ferric oxyhydroxide (FeOOH) and iron citrate (FeC 6 H 5 O 7 ). The results showed that when the amount of SFW added was 30%, phosphorus release increased by 3.5-5 times, and the VFAs yield reached 2857.85 mg/L. When using FeC 6 H 5 O 7 as the iron source, the production of vivianite and VFAs increased by 2 times and 5 times, respectively. Additionally, citric acid enhanced the metabolic activity of acid-producing bacteria, promoting the conversion of more substrates into VFAs. The addition of organic substrates during co-fermentation promoted the growth of hydrolytic and acidogenic bacteria, enhancing hydrolysis and acidogenesis. These changes were beneficial to the biological processes of Fe 2+ and PO 4 3− release and VFAs production. The experiment further revealed that in the organic iron source FeC 6 H 5 O 7 experimental group, the acid-producing bacterial consortium preferentially utilized tyrosine-type substrates, ultimately achieving coupling between VFAs accumulation and Fe 3+ reduction. Overall, this study provides new insights into vivianite formation and VFAs production during the co-fermentation of WAS and SFW with different iron sources, offering a potential pathway for simultaneous nutrient recovery and waste valorization. Graphical
研究领域:
环境工程
·
废物管理
·
生物资源技术
·
微生物代谢
·
营养物回收
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）