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Effects of sludge age on anaerobic acidification of waste activated sludge: Volatile fatty acids production and phosphorus release

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Journal of Environmental Sciences 2021年第7期33卷 11-21页

作者： Sisi Chen Xiaohu Dai Dianhai Yang Bin Dong State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China

Effects of sludge age on volatile fatty acids (VFAs) production and Phosphorus (P) release during anaerobic acidification of waste activated sludge (WAS) were *** batch reactors (SBR) fed with simulating domestic sewage were applied to produce WAS of different sludge ages,and batch tests were used for anaerobic *** maximum dissolved total organic carbon,release of PO_(4)^(3+)-P,and accumulation of acetate (C2),propionate (C3),butyrate (C4),and valerate (C5) decreased by 56.2%,55.8%,52.6%,43.7%,82.4%and 84.8%,respectively,as the sludge age of WAS increased from 5 to 40 *** degradation of protein played a dominating role in decreasing DTOC and VFAs ***,the increase in molecular weight of organics and organic nitrogen content in the supernatant after acidification suggested that the refractory protein in WAS increased as sludge age *** the production of C2,C3,C4,and C5 from WAS decreased as the sludge age increased,the proportions of C2 and C3 in VFAs increased,which might be due to the declined production of C5 from protein and the faded genus *** sludge age of WAS at a relatively low level (<10 days) is more appropriate for anaerobic acidification of WAS as internal carbon sources and P resource.

关键词： Sludge age Waste activated sludge Acidification Volatile fatty acids Microbial community

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Energy neutrality potential of wastewater treatment plants:A novel evaluation framework integrating energy efficiency and recovery

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Frontiers of Environmental Science & Engineering 2022年第9期16卷 65-75页

作者： Runyao Huang Jin Xu Li Xie Hongtao Wang Xiaohang Ni Key Laboratory of Yangtze River Water Environment Ministry of EducationState Key Laboratory of Pollution Control and Resource ReuseCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China UNEP-Tongji Institute of Environment for Sustainable Development Tongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Tongji UniversityShanghai 200092China

Wastewater treatment plants(WWTPs)consume large amounts of energy and emit greenhouse gases to remove *** study proposes a framework for evaluating the energy neutrality potential(ENP)of WWTPs from an integrated *** data of 970 WWTPs in the Yangtze River Economic Belt(YREB)were extracted from the China Urban Drainage Yearbook *** potential chemical and thermal energies were estimated using combined heat and power(CHP)and water source heat pump,*** key performance indicators(KPIs)were then established:the energy self-sufficiency(ESS)indicator,which reflects the offset degree of energy recovery,and the comprehensive water–energy efficiency(CWEE)indicator,which characterizes the efficiency of water–energy *** the qualitative results,98 WWTPs became the benchmark(i.e.,CWEE=1.000),while 112 WWTPs were fully self-sufficient(i.e.,ESS≥100%).Subsequently,four types of ENP were classified by setting the median values of the two KPIs as the critical *** WWTPs with high ENP had high net thermal energy values and relatively loose discharge *** explanatory factor analysis of water quantity and quality verified the existence of scale *** carbon source and biodegradability condition were also significant *** the CWEE indicator was mostly sensitive to the input of CHP,future optimization shall focus on the moisture and organic content of *** study proposes a novel framework for evaluating the ENP of *** results can provide guidance for optimizing the energy efficiency and recovery of WWTPs.

关键词： Wastewater treatment plants Energy neutrality potential Energy efficiency Energy recovery Evaluation framework

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Polyphosphate Accelerates Transformation of Nonstructural Carbohydrates to Improve Growth of ppk-Expressing Transgenic Rice in Phosphorus Deficiency Culture

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Rice science 2023年第3期30卷 235-246页

作者： ZHU Jinling WEI Ruping WANG Xin ZHENG Chaoqun WANG Mengmeng YANG Yicheng YANG Liuyan State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China School of Science China Pharmaceutical UniversityNanjing 211198China Department of Agricultural and Biological Engineering University of FloridaGainesvilleFL 32611America

Crop yield and quality are often limited by the amount of phosphate fertilizer added to infertile soils,a key limiting factor for sustainable development in modern *** polyphosphate kinase(ppk)gene-expressing transgenic rice with a single-copy line(ETRS)is constructed to improve phosphate fertilizer utilization efficiency for phosphorus resource *** investigate the potential mechanisms of the increased biomass in ETRS in low phosphate culture,ETRS was cultivated in a low inorganic phosphate(Pi)culture medium(15μmol/L Pi,LP)and a normal Pi culture medium(300μmol/L Pi,CP),*** 89 d of cultivation in different concentrations of phosphate culture media,the total phosphorus,polyphosphate(polyP),biomass,photosynthetic rate,nonstructural carbohydrate(NSC)contents,related enzyme activities,and related gene expression levels were *** results showed that ETRS had a high polyP amount to promote the photosynthetic rate in LP,and its biomass was almost the same as the wild type(WT)in *** NSC content of ETRS in LP was higher than that of WT in LP,but slightly lower than that of WT in *** notably promoted the sucrose phosphate synthase activities of ETRS and significantly down-regulated the expression levels of sucrose transporter genes(OsSUT3 and OsSUT4),resulting in inhibiting the transport of sucrose from shoot to root in *** was concluded that polyP can stimulate the synthesis of NSCs in LP,which improved the growth of ETRS and triggered the biological activities of ETRS to save phosphate *** study provides a new way to improve the utilization rate of phosphate fertilizer in rice production.

关键词： polyphosphate phosphate fertilizer nonstructural carbohydrate sucrose transporter gene sucrose phosphate synthase

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Boosting C_(2)H_(6)/C_(2)H_(4) separation via the precise electrostatic modulation of synthetic 1D channel at atomic level

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Nano Research 2024年第11期17卷 10083-10087页

作者： Salamanti Ainiwaner Hengcong Huang Jia-Jia Zheng Fengting Li Xue-Tong Yang Yang-Yang Guo Fangli Yuan Ming-Shui Yao Yifan Gu College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Laboratory of Theoretical and Computational Nanoscience National Center for Nanoscience and Technology Chinese Academy of Sciences Beijing 100190 China Skate Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing 100049 China

The regulation of gas sorption via simple pore modification is crucial to molecular recognition and chemical ***,a rational pore surface electrostatic modulation in synthetic one dimensioned(1-D)channel is demonstrated to boost ethane/ethylene(C_(2)H_(6)/C_(2)H_(4))selectivity for one-step extraction of C_(2)H_(4) from C_(2)H_(6)/C_(2)H_(4) *** the precise modulation of the surface charge arrangement with negatively charged moieties in the 1-D channel of a metal—organic framework(MOF),enhanced C_(2)H_(6)—host framework and decreased C_(2)H_(4)—host framework electrostatic interactions were obtained,which resulted in an obvious improvement in adsorption ***,the breakthrough separation performance rendered the obtained MOF an efficient adsorbent for C_(2)H_(4) purification from C_(2)H_(6)/C_(2)H_(4) *** combined detail theoretical studies prove that the gas sorption selectivity is remarkably sensitive to framework electrostatic change even in the case of pore surface modification at the atomic *** results are of fundamental importance to the design of porous materials for challenging separation tasks.

关键词： metal—organic framework ethane/ethylene separation ethane—selective MOF adsorption electrostatic modulation

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Effect of soil-applied fertilizers on arsenic transport and transformation mechanisms in the water-soil-rice system

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Journal of Earth Science 2025年

作者： Haotian Yu Ying Jie Feilong Li Ruihua Shang Teng Ma College of Resource and Environmental Engineering， Wuhan University of Science and Technology State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution， China University of Geosciences Fujian Institute of Geological Survey

Arsenic (As) pollution in paddy field appeared around the world， however， the study on the effect of fertilizer on As accumulation in water-soil-rice system remains unknown. This study investigated the effects of organic fertilizer (OF)， inorganic fertilizer (IOF)， and bio-organic fertilizer (BOF) on As transformation in water-soil-rice system under surface water (SW) and high-As groundwater (GW) irrigation conditions through potting experiments. The results indicated that IOF group had the lowest As in rice grain (0.34 mg/kg)， followed closely by BOF (0.36 mg/kg) and OF (0.43 mg/kg) under SW irrigation. Under SW irrigation， the lowest reduction in iron mineral dissolution and the lowest pore water As concentration were observed in the IOF group， which reduced the accumulation in rice grain. The BOF application resulted in the highest As content in the rice root but the transformation in rice was lowest， resulting in the lowest As content in the straw. High-As GW irrigation increased both the total and bioavailable As in the soil， and increased As absorption by rice， causing the As levels in rice grains to exceed the standard (GB2762-2017). According to the values of bioconcentration factor (BCF) and translocation factor (TF)， the IOF helped reduce As accumulation in rice under SW irrigation， whereas the OF effectively reduced As accumulation in rice grain under high-As GW irrigation. This study provides a theoretical basis and technical support for the prevention and control of As contamination of rice.

关键词： arsenic organic fertilizer bio-organic fertilizer inorganic fertilizer

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Interface-induced charge transfer pathway switching of a Cu_(2)O-TiO_(2)photocatalyst from p-n to S-scheme heterojunction for effective photocatalytic H_(2)evolution

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Journal of Materials Science & Technology 2024年第26期193卷 98-106页

作者： Kaihui Huang Guijie Liang Shaolong Sun Haobin Hu Xiaoming Peng Rongchen Shen Xin Li Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China Hubei Key Lab Low Dimens Optoelect Mat&Devices Hubei University of Arts and ScienceXiangyang 441053China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China Key Laboratory of Efficient Utilization of Oil and Gas Resources in Longdong College of Petroleum and Chemical EngineeringLongdong UniversityQingyang 745000China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

Photocatalytic hydrogen evolution from water splitting is an appealing method for producing clean chemical ***_(2)O,with a suitable bandgap,holds promise as a semiconductor for this ***,the strong photo-corrosion and rapid charge recombination of Cu_(2)O strongly limit its application in the photocatalytic ***,an S-scheme heterojunction photocatalyst composed of TiO_(2)and Cu_(2)O was rationally designed to effectively avoid the photo-corrosion of Cu_(2)*** introduction of an interfacial nitrogen-doped carbon(NC)layer switches the heterojunction interfacial charge transfer pathway from the p-n to S-scheme heterojunction,which avoids excessive accumulation of photogenerated holes on the surface of Cu_(2)***,the hybrid structure shows a broad spectral response(300-800 nm)and efficient charge separation and transfer ***,the highest photocatalytic hydrogen evolution rate of TiO_(2)-NC-3%Cu_(2)O-3%Ni is 13521.9μmol g^(-1)h^(-1),which is approximately 664.1 times higher than that of pure Cu_(2)***-situ X-ray photoelectron spectroscopy and Kelvin probe confirm the charge transfer mechanism of S-scheme *** formation of S-scheme heterojunctions effectively accelerates the separation of photogenerated electron-hole pairs and enhances redox capacity,thereby improving the photocatalytic performance and stability of Cu_(2)*** study provides valuable insights into the rational design of highly efficient Cu_(2)O-based heterojunction photocatalysts for hydrogen production.

关键词： Photocatalytic hydrogen evolution Cu_(2)O S-scheme heterojunction Charge separation mechanism Nitrogen doped carbon

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Enhanced methane production during long-term UASB operation at high organic loads as enabled by the immobilized Fungi

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Frontiers of Environmental Science & Engineering 2022年第6期16卷 47-59页

作者： Qiong Guo Zhichao Yang Bingliang Zhang Ming Hua Changhong Liu Bingcai Pan State Key Laboratory of Pollution Control and Resource Reuse School of EnvironmentNanjing UniversityNanjing 210023China Research Center for Environmental Nanotechnology(ReCENT) Nanjing UniversityNanjing 210023China School of Life Sciences Nanjing UniversityState Key Laboratory of Pharmaceutical BiotechnologyNanjing 210023China

Anaerobic digestion is widely applied in organic wastewater treatment coupled with bioenergy production,and how to stabilize its work at the high organic loading rate(OLR)remains a ***,we proposed a new strategy to address this issue via involving the synergetic role of the Aspergillus sydowii 8L-9-F02 immobilized beads(AEBs).A long-term(210-day)continuous-mode operation indicated that the upflow anaerobic sludge bed(UASB)reactor(R1,with AEBs added)could achieve the OLR as high as 25.0 kg/(m^(3)×d),whereas the control reactor(R0,with AEBs free)could only tolerate the maximum OLR of 13.3 kg/(m^(3)×d).Remarkably,much higher COD removal(85.9%vs 23.9%)and methane production(5.4 m^(3)/(m^(3)×d)vs 2.2 m^(3)/(m^(3)×d))were achieved in R1 than R0 at the OLR of 25.0 kg/(m^(3)×d).Such favorable effect results from the facts that fungi inhibit VFAs accumulation,favor the pH stabilization,promote the generation of more extracellular polymeric substance,and enhance the sludge granulation and ***,fungi may enhance the secretion of acetyl-coenzyme A,a key compound in converting organic matters to CO_(2).In addition,fungi are favorable to enrich methanogenic archaea even at high OLR,improving the activity of acetate kinase and coenzyme F_(420) for more efficient methanogenic *** work may shed new light on how to achieve higher OLR and methane production in anaerobic digestion of wastewater.

关键词： Anaerobic digestion Fungi Methane production High OLR Microbial community

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Coupling magnetic particles with flocculants to enhance demulsification and separation of waste cutting emulsion for engineering applications

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Journal of Environmental Sciences 2021年第7期33卷 173-183页

作者： Yongjiao Xiong Baoqiang Wu Xiangfeng Huang Chenlu Li Bin Lu Jia Liu Lijun Lu Shiyang Li Kaiming Peng College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseMinistry of Education Key Laboratory of Yangtze River Water EnvironmentShanghai Institute of Pollution Control and Ecological SecurityTongji UniversityShanghai 200092China

Magnetic particles were coupled with a flocculant to enhance the demulsification and separation of waste cutting *** optimal magnetic particle size and critical magnetic field conditions were investigated to achieve large-scale engineering application of magnetic demulsification separation for waste cutting emulsion *** micro-scale magnetic particles were found to show comparable effects to nano-scale magnetic particles on enhancing the demulsification and separation of cutting emulsions,which are beneficial for broadening the selectivity of low-cost magnetic *** critical magnetic separation region was determined to be an area 40 mm from the magnetic field *** to the flocculant demulsification,the magnetic demulsification separation exhibited a significant advantage in accelerating flocs-water separation by decreasing the separation time of flocs from 180-240 min to less than 15 min,compressing the flocs by reducing the floc volume ratio from 60%-90%to lower than 20%,and showing excellent adaptability to the variable properties of waste cutting *** with the design of the magnetic disk separator,continuous demulsification separation of the waste cutting emulsion was achieved at 1.0 t/hr for at least 10 hr to obtain clear effluent with 81%chemical oxygen demand removal and 89%turbidity *** study demonstrates the feasibility of applying magnetic demulsification separation to large-scale continuous treatment of waste ***,it addresses the flocs-water separation problems that occur in practical flocculant demulsification engineering applications.

关键词： Waste cutting emulsion Magnetic particles Demulsification and separation Magnetic disk separator Large-scale treatment

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Enhanced methane production from waste activated sludge by potassium ferrate combined with thermal hydrolysis pretreatment

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Environmental Science and pollution Research 2024年第33期31卷 45862-45874页

作者： Guo, Bing Zeng, Jiachen Hao, Yuchi Hu, Jiawei Li, Zhuo State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science & ampEngineering Tongji University 1239 Siping Road Shanghai200092 China CCCC National Engineering Research Center of Dredging Technology and Equipment Co. Ltd. Shanghai200082 China

Anaerobic digestion of waste activated sludge (WAS) was one of the directions of sludge treatment, but how to effectively improve the production of methane as a resource product of anaerobic digestion of sludge still needs further research. The study examined how the combination of potassium ferrate (PF) and thermal hydrolysis (TH) pretreatment affected methane production from sludge. The results demonstrated a positive synergistic effect on methane production with PF-TH pretreatment. Specifically, by employing a 0.05 g/g TSS (total suspended solids) PF in conjunction with TH at 80 °C for 30 min, the methane yield increased from 170.66 ± 0.92 to 232.73 ± 2.21 mL/g VSS (volatile suspended solids). The co-pretreatment of PF and TH has been substantiated by mechanism studies to effectively enhance the disintegration and biodegradability of sludge. Additionally, the variation of microbial community revealed an enrichment of active microorganisms associated with anaerobic digestion after treated with PF + TH, resulting in a total abundance increase from 11.87 to 20.45% in the PF + TH group. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Anaerobic digestion

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Consuming probiotics protects against cadmium exposure from rice consumption while promotes gut health: An assessment based on a mouse model

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Science of the Total Environment 2025年 958卷 177997页

作者： Xi, Jin-Feng Zhou, Lei Zhang, Yao-Sheng Lin, Xin-Ying Chen, Shan Xue, Rong-Yue Zhou, Dongmei Li, Hong-Bo State Key Laboratory of Pollution Control and Resource Reuse Jiangsu Key Laboratory of Vehicle Emissions Control School of Environment Nanjing University Nanjing210023 China

Cadmium (Cd) in rice constitutes a global health risk. It is crucial to develop strategies that not only reduce the bioavailability of Cd in rice but also confer additional health benefits. One potential approach involves the consumption of probiotics, which can bind Cd in the intestines and enhance gut health. The effects of consuming Akkermansia muciniphila, Bifidobacterium pseudolongum, and Psychrobacter sp. on the bioavailability of Cd in rice and gut health were evaluated using in vivo mouse bioassays and in vitro Cd immobilization assays. In mice fed Cd-contaminated rice without dietary calcium (Ca) and iron (Fe) supplementation (i.e., under conditions of mineral deficiency), the intake of these probiotics insignificantly reduced Cd accumulation in the kidneys and livers, although it did promote Cd excretion via feces. This outcome was primarily due to the competition for Ca and Fe between the probiotics and the host, which led to increased intestinal expression of Ca and Fe transporters under mineral-deficient conditions, thereby mitigating the probiotics' ability to reduce Cd bioavailability. Conversely, in mice fed Cd-contaminated rice with adequate dietary Ca and Fe (i.e., under conditions of mineral adequacy), probiotic intake significantly decreased Cd concentrations in the kidneys by 60.0 %–72.0 % compared to the control group exposed to Cd. Additionally, probiotic consumption fostered the growth of beneficial gut bacteria and strengthened intestinal tight junctions, reducing the inflammatory response in the intestines. These findings suggest that combining probiotics with sufficient Ca and Fe intake can effectively reduce dietary Cd exposure and enhance gut health. © 2024 Elsevier B.V.

关键词： Macroinvertebrates

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