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Cultivation of Chlorella *** in inland saline-alkaline water under different light qualities

Frontiers of Environmental Science & Engineering 2022年第4期16卷 59-68页

作者： Xiaoya Liu Yu Hong Yu Liu Beijing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China

Inland saline-alkaline water can be used for the low-cost cultivation of microalgae,but whether algal biomass under various light sources has the potential to produce biodiesel remains to be ***,the influence of different light-emitting diode(LEDs)light colors(blue,red,white,mixed blue-red,and mixed blue-white LED)on the growth performance,lipid accumulation,and fatty acid composition of Chlorella *** cultivated in inland saline-alkaline water was *** highest algal density was obtained under blue LEDs at the end of cultivation,reaching 1.93±0.03 × 10^(7) cells/*** LEDs can improve biomass yield,total lipid yield,and triacylglycerol yield per algal *** main fatty acid components of Chlorella from inland saline-alkaline water were palmitic acid and linoleic *** Biodiesel Analyzer software was used to predict algal biodiesel quality by estimating different quality *** cetane number,kinematic viscosity,and density of Chlorella biodiesel were 51.714-67.69,3.583-3.845 mm^(2)/s,and 0.834-0.863 g/cm^(3),*** flirther proved that the Chlorella biomass obtained from inland saline-alkaline water has the potential to be used as a high-quality biodiesel feedstock.

关键词： Light quality Chlorella Inland saline-alkaline water Fatty acid Biodiesel property

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Enhanced phosphate removal using zirconium hydroxide encapsulated in quaternized cellulose

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Journal of Environmental Sciences 2020年第3期32卷 102-112页

作者： Shuoxun Dong Qinghua Ji Yili Wang Huijuan Liu Jiuhui Qu Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry UniversityBeijing 100083China

Zirconium-based materials are efficient adsorbent for aqueous phosphate ***,current zirconium-based materials still show unsatisfied performance on adsorption capacity and ***,we demonstrate a zirconium hydroxide encapsulated in quaternized cellulose(QC-Zr) for the selective phosphate *** hydroxide nanoparticles were simultaneously generated in situ with the QC framework and firmly anchored in the three-dimensional(3D) cross-linked cellulose *** maximum P adsorption capacity of QC-Zr was 83.6 mg P/***,the QC-Zr shows high P adsorption performance in a wide pH range,generally due to the electrostatic effects of quaternized *** enhanced adsorption of P was also achieved in the presence of competing anions(including Cl^-,NO3^-,SO4^2-,SO4^4-) and humic acid(HA) even at a molar ratio up to 20 *** column adsorption capacity of QC-Zr reached 4000 bed volumes(BV) at EBCT=0.5 min as the P concentration decreased from 2.5 to 0.5 mg/*** study revealed that both-N^+(CH3)3 groups and zirconium hydroxide were involved in phosphate adsorption via electrostatic interactions between -N^+(CH3)3 and phosphate,and the formation of zirconium hydrogen phosphate(Zr(HPO4)x).The 31 P nuclear magnetic resonance(NMR) study implied that P surface-precipitated and inner-sphere complexed with zirconium hydroxide at a ratio of 3:1.

关键词： Adsorption Phosphate removal Zirconium hydroxide aerogel Quaternized cellulose

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Accurate calculation method for urban domestic sewage centralized collection rate based on water quality and quantity variations

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Journal of Cleaner Production 2025年 516卷

作者： Lingwu Zeng Dezhi Sun Beijing Key Lab for Source Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China National Joint Research Center for Ecological Conservation and High Quality Development of the Yellow River Basin Beijing 100012 China

Rapid urbanization has created significant challenges for domestic sewage management, particularly in accurately assessing sewage collection rate. A systematic analysis of globally adopted indicators for assessing sewage collection reveals a key limitation of existing calculation methods: they do not adequately account for variations in water quality and quantity within sewer networks, leading to biased results. To address this issue, this study proposes a new method for calculating the sewage collection rate. This method incorporates two key parameters-external water BOD 5 concentration and sewer BOD 5 degradation rate-to quantify external water infiltration, and to capture the effects of water quality and quantity variations on sewage collection rate. Applying this method, the domestic sewage centralized collection rates were calculated to range from 83.29 % to 90.67 % in Changzhou and from 76.40 % to 81.88 % in Shenzhen. Sensitivity analysis showed that the sewer BOD 5 degradation rate and the external water BOD 5 concentration affected the results by 0.25 and 0.042, respectively. Based on these findings, we propose several strategies to improve calculation accuracy, including developing a BOD 5 degradation rate model, deploying smart drainage systems, establishing cross-sector data-sharing platforms, and formulating standardized guidelines for calculating sewage collection rate. This study provides theoretical support for global sewage management.

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Selection and characterization of eight freshwater green algae strains for synchronous water purification and lipid production

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Frontiers of Environmental Science & Engineering 2016年第3期10卷 548-558页

作者： Jingjing ZHAN Qiao ZHANG Momei QIN Yu HONG Beijing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China State Environmental Protection Key Laboratory of Drinking Water Source Management and Technology Shenzhen Key Laboratory of Drinking Water Source Safety Control Shenzhen Research Academy of Environmental Sciences Shenzhen 518001 China

The objective of this study is to select and characterize the candidate for synchronous water purification and lipid production from eight freshwater microalgae strains （Chlorella sp. HQ, C. emersonii, C. pyrenoidosa, C. vulgaris, Scenedesmus dimorphus, S. quadricauda, S. obiquus, Scenedesmus sp. LX1）. The strains Chlorella sp. HQ, C. pyrenoidesa, and S. obliquus showed superiority in biomass accumulation, while the top biomass producers did not correspond to the top lipid producers. S. quadricauda achieved higher lipid content （66.1%）, and Chlorella sp. HQ and S. dimorphus ranked down in sequence, with lipid content above 30%. Considering nutrient removal ability （total nitrogen （TN）： 52.97%; total phosphorus （TP）： 84.81%）, the newly isolated microalga Chlorella sp. HQ was the possible candidate for water purification coupled with lipid production. To further investigate the lipid producing and nutrient removal mechanism of candidate microalga, the ultra structural changes especially the lipid droplets under different water qualities （different TN and TP concentrations） were characterized. The results elucidate the nutrient-deficiency （TN： 3.0 mg·L^-1; TP： 0.3 mg·L^-1） condition was in favor of forming lipid bodies in Chlorella sp. HQ at the sub-cellular level, while the biomass production was inhibited due to the decrease in chloroplast number which could further suppress the nutrient removal effect. Finally, a two- phase cultivation process （a nutrient replete phase to produce biomass followed by a nutrient deplete phase to enhance lipid content） was conducted in a photo-bioreactor for Chlorella sp. HQ to serve for algae-based synchronous biodiesel production and wastewater purification.

关键词： freshwater microalgae biomass production lipid accumulation nutrient removal

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Reversibility of the structure and dewaterability of anaerobic digested sludge

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Journal of Environmental Sciences 2016年第4期28卷 178-186页

作者： Yiqi Sheng Yili Wang Wei Hu Xu Qian Huaili Zheng Xiaoxiu Lun College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry University College of Urban Construction and Environmental Engineering Chongqing University

The reversibility of the structure and dewaterability of broken anaerobic digested sludge（ADS）is important to ensure the efficiency of sludge treatment or management *** study investigated the effect of continuous strong shear（CSS）and multipulse shear（MPS）on the zeta potential,size（median size,d（50））,mass fractal dimension（DF）,and capillary suction time（CST）of ADS ***,the self-regrowth（SR）of broken ADS aggregates during slow mixing was also *** results show that raw ADS with d（50） of 56.5μm was insensitive to CSS–SR or MPS–SR,though the size slightly decreased after the breakage *** conditioned ADS with d（50） larger than 600μm,the breakage in small-scale surface erosion changed to large-scale fragmentation as the CSS strength *** most cases,after CSS or MPS,the broken ADS had a relatively more compact structure than before and d（50） is at least 200μ*** CST of the broken fragments from optimally dosed ADS increased,whereas that corresponding to overdosed ADS *** treatment resulted in larger and more compact broken ADS fragments with a lower CST value than *** the subsequent slow mixing,the broken ADS aggregates did not recover their charge,size,and dewaterability to the initial values before *** addition,less than 15%self-regrowth in terms of percentage of the regrowth factor was observed in broken ADS after CSS at average velocity gradient no less than 1905.6 sec^（-1）.

关键词： Anaerobic digested sludge Shear Reversibility Structure Dewaterability Floc strength

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Sorption of aromatic organophosphate flame thermally and hydrothermally produced retardants on biochars

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Frontiers of Environmental Science & Engineering 2020年第3期14卷 75-87页

作者： Ziwen Du Chuyi Huang Jiaqi Meng Yaru Yuan Ze Yin Li Feng Yongze Liu Liqiu Zhang Beijing Key Laboratory for Source Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control and Eco-remediationBeijing Forestry UniversityBeijing 100083China College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China

Aromatic organophosphate flame retardant(OPFR)pollutants and biochars are commonly present and continually released into soils due to their increasingly wide *** this study,for the first time,the sorption of OPFRs on biochars was *** triphenyl phosphate(TPhP)and triphenylphosphine oxide(TPPO)have similar molecular structures and sizes,TPhP exhibited much faster and higher sorption than TPPO due to its stronger hydrophobicity,suggesting the dominant role of hydrophobic interactions in TPhP ***π-πelectron donor-acceptor(EDA)interactions also contributed to the sorption process,as suggested by the negative correlation between the sorption capacity of the aromatic OPFRs and the aromatic index(H/C atomic ratios)of *** functional theory calculations further showed that one benzene ring of aromatic OPFRs has no electrons,which may interact with biochar viaπ-πEDA *** electrostatic attraction between the protonated P=O in OPFRs and the negatively charged biochar was found to occur at pH below *** work provides insights into the sorption behaviors and mechanisms of aromatic OPFRs by biochars.

关键词： Organophosphate flame retardants Hydrochar Pyrochar Adsorption Emerging contaminants Biochar

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An intelligent system for precise management of coagulants in sludge conditioning: Inspired by the exploratory behavior in primates using senses

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water Research 2025年 283卷 123842页

作者： Shuxin Li Daxin Zhang Rongxi Zhu Tengchong Ma Meilin Liu Luyao Ma Yili Wang Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China China Institute of Water Resources and Hydropower Research Beijing 100038 China

Coagulation conditioning is a key step for sludge dewatering, while the control of optimal coagulant dosing is still a challenge. This study proposes an intelligent system for the precise management of coagulants (IIS PMC ) in sludge conditioning. This system was assembled using an electrical impedance spectroscopy (EIS)-based sensor and a decision-making model to conduct the self-perception, decision-making, execution, and dosage optimization in sludge conditioning through a feedback-driven exploratory trial process, conceptually inspired by structured exploration behavior observed in primates. Using the optimal dosage obtained by the traditional manual jar test as the reference, the accuracy and repeatability of the IIS PMC were investigated. The robustness under different perturbed conditions, reliability, and generalizability of the IIS PMC were further assessed. Moreover, the long-term operational capability and the feasibility of the application in the scaled-up conditioning were also discussed. The results showed that the intelligent system achieved statistical median accuracy and repeatability of approximately 5 %, good reliability with a 5 g/kg resolution (R 2 > 0.94 in validation tests) in determining the optimal coagulant dosage, and strong robustness under sludge conductivity and concentration perturbed conditions. In addition, the performance of the IIS PMC was validated across different sludge sources, including activated sludge, dredged sediment, and algal sludge, as well as different coagulants, exhibiting solid generalizability. The system also demonstrated stable continuous operation over 40 batches, which is equivalent to the number of continuous operation batches of a small-sized treatment plant over approximately half a month. Furthermore, even after scaling up the conditioning tank, the IIS PMC maintained stable performance. These findings highlight the potential of the IIS PMC for practical applications in sludge conditioning.

关键词： Risk perception

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Polyethylene microplastics hamper aged biochar’s potential in mitigating greenhouse gas emissions

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Carbon Research 2025年第1期4卷 1-14页

作者： Chen, Yalan Wang, Zhibo Zhang, Anqi Li, Yang Sun, Ke Jiang, Chenrun Gunina, Anna Aloufi, Abeer S. Liang, Xinru Han, Zichen Xiao, Yue Zhang, Yunqian Du, Zhangliu Zhu, Shishu Kuzyakov, Yakov State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China College of Life Sciences Beijing Normal University Beijing100875 China Department of Urban Engineering Graduate School of Engineering The University of Tokyo Tokyo113-8656 Japan Agrarian and Technological Institute RUDN University Miklukho-Maklaya st. 6 Moscow117198 Russia Department of Biology College of Science Princess Nourah Bint Abdulrahman University P.O. Box 84428 Riyadh11671 Saudi Arabia Beijing Key Laboratory of Biodiversity and Organic Farming College of Resources and Environmental Sciences China Agricultural University Beijing100193 China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education School of Environment and Energy South China University of Technology Guangzhou510006 China Department of Soil Science of Temperate Ecosystems Department of Agricultural Soil Science University of Goettingen Göttingen37077 Germany Moscow117198 Russia

While biochar effectively reduces greenhouse gas emissions, the coincident microplastics will alter these benefits. To assess the long-term efficacy of biochar application in reducing emissions amidst microplastic interference, we investigated the interactive effects of polyethylene microplastics (1%–5% wt) and decadal biochar addition (aged biochar) on C and N stability in a Fluvic Cambisol. Aged biochar and polyethylene individually reduced CO2 emissions by 49% and 18%, respectively, over 91-day incubation. This was due to decreased soil aggregation, dissolved organic matter (DOM) content, and increased DOM aromaticity, which reduced microbial biomass and chitinase activity associated with soil organic matter (SOM) decomposition. This ultimately led to increased accumulation of microbial necromass carbon (MNC) to soil stable carbon pool. Interestingly, the coexistence of polyethylene diminished the efficacy of biochar in mitigating CO2 emissions (+ 44 ~ 82%) and stabilizing MNC (-18 ~ 23%). This was because the interaction between polyethylene and biochar facilitated macroaggregate formation and DOM accumulation and decreased DOM aromaticity, which increased microbial biomass and chitinase activity for SOM decomposition. Similar to soil C dynamics, aged biochar largely reduced N2O emissions by 54%, due to decreased nirK but increased nifH genes. Polyethylene increased N2O emissions by 5% and 25% in biochar-free and aged biochar soil, respectively, likely through upregulation of nirS and nirK but downregulating nifH gene expression. Thus, polyethylene microplastics may undermine the benefits of biochar in mitigating climate change, highlighting the necessity to recognize microplastics as a global change factor and to incorporate their role in elemental cycling alongside their global transport. Graphic Abstract: (Figure presented.) © The Author(s) 2025.

关键词： Greenhouse gas emissions

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Antimony(V) removal from water by iron-zirconium bimetal oxide: Performance and mechanism

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Journal of Environmental Sciences 2012年第7期24卷 1197-1203页

作者： Xuehua Li Xiaomin Dout Junqing Li Beijing Forestry University Beijing 100083China Beijing Key Laboratory for Source Control Technology of Water Pollution Beijing Forestry UniversityBeijing 100083China

A Fe-Zr binary oxide adsorbent has been successfully synthesized using a co-precipitation method. It showed a better performance for antimonate （Sb（V）） removal than zirconium oxide or amorphous ferric oxide. The experimental results showed that the Fe-Zr adsorbent has a capacity of 51 mg/g at an initial Sb（V） concentration of 10 mg/L at pH 7.0. Sb（V） adsorption on the Fe-Zr bimetal oxide is normally an endothermic reaction. Most of the Sb（V） adsorption took place within 3 hr and followed a pseudo second-order rate law. Co-existing anions such as SO42-, NO3 and C1- had no considerable effects on the Sb（V） removal; PO3- had an inhibitory effect to some extent at high concentration; while CO2- and SiO4- showed significant inhibitory effects when they existed in high concentrations. The mechanism of Sb（V） adsorption on the adsorbent was investigated using a combination of zeta potential measurements, XPS, Raman, FT-IR observations and SO42- release determination. The ionic strength dependence and zeta potential measurements indicated that inner-sphere surface complexes were formed after Sb（V） adsorption. Raman and XPS observations demonstrated that both Fe-OH and Zr-OH sites at the surface of the Fe-Zr adsorbent play important roles in the Sb（V） adsorption. FT-IR characterization and SO42- release determination further demonstrated that the exchange of SO2- with Sb（V） also could promote the adsorption process. In conclusion, this adsorbent showed high potential for future application in Sb（V） removal from contaminated water.

关键词： antimony adsorption iron-zirconium oxide performance, mechanism

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Performance and bioparticle growth of anaerobic baffled reactor （ABR） fed with low-strength domestic sewage

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Frontiers of Environmental Science & Engineering 2015年第2期9卷 352-364页

作者： Jing FENG Yili WANG Xueyuan JI Dongqin YUAN Hui LI College of Environmental Science and Engineering Beijing Key Laboratory for Source Control Technology of Water Pollution Beijing Forestry University Beijing 100083 China

We investigated the performance of a 15.3 L capacity anaerobic baffled reactor （ABR） toward the treatment of low-strength domestic wastewater. The start- up period of the ABR was finished within approximately 130 days at a temperature below 25~C. The average CODcr in the effluent was 165 mg.L 1 and the corresponding CODcr removal efficiency of the ABR was 52.3%. During the third stage （from day 130 to day 233） of ABR operation, the average CODcr in the effluent reached 71 mg· L^-1, which meets the secondary discharge requirement of the Integrated Wastewater Discharge Standard （GB 18918-2002, China）. Moreover, partial microbial separa- tion was observed along the five ABR compartments through scanning electron microscopic images. The geometric mean diameter of bioparticles in the five compartments increased from 0.050 mm to 0.111, 0.107, 0.104, 0.110, and 0.103 mm during the start-up stage. After operation for 179days, the further increased to 0.376, corresponding diameters 0.225, 0.253, 0.239, and 0.288mm, respectively. The fractal dimensions of the bioparticles indicated that these particles have smoother surfaces and more compact structures during ABR operation. Morphological analysis of the bioparticle sections demonstrated that the bioparticles have a pore volume of 30%-55%. The highest porosity was observed for the bioparticles in the second ABR compartment, whereas the lowest fractal dimension ofbioparticle section was observed in the fifth compartment.

关键词： anaerobic baffled reactor low-strengthdomestic wastewater start-up bioparticles morphology

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