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Bioassay: A useful tool for evaluating reclaimed water safety

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Journal of Environmental Sciences 2020年第2期32卷 165-176页

作者： Jianying Xu Dongbin Wei Feipeng Wang Chenzhong Bai Yuguo Du State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resource Environment and Tourism Capital Normal UniversityBeijing 100048China University of Chinese Academy of Sciences Beijing 100049China

Wastewater reclamation and reuse has been proved to be an effective way to relieve the fresh water crisis.However, toxic contaminants remaining in reclaimed water could lead to potential risk for reuse, and the conventional water quality standards have difficulty guaranteeing the safety of reclaimed water.Bioassays can vividly reflect the integrated biological effects of multiple toxic substances in water as a whole, and could be a powerful tool for evaluating the safety of reclaimed water.Therefore, in this study, the advantages and disadvantages of using bioassays for evaluating the safety of reclaimed water were compared with those of conventional water quality standards.Although bioassays have been widely used to describe the toxic effects of reclaimed water and treatment efficiency of reclamation techniques, a single bioassay cannot reflect the complex toxicity of reclaimed water, and a battery of bioassays involving multiple biological effects or in vitro tests with specific toxicity mechanisms would be recommended.Furthermore, in order to evaluate the safety of reclaimed water based on bioassay results, various methods including potential toxicology, the toxicity unit classification system, and a potential eco-toxic effects probe are summarized as well.Especially, some integrated ranking methods based on a bioassay battery involving multiple toxicity effects are recommended as useful tools for evaluating the safety of reclaimed water, which will benefit the promotion and guarantee the rapid development of the reclamation and reuse of wastewater.

关键词： Reclaimed water Water quality Safety evaluation Toxicity Bioassay

Acute toxicity evaluation for quinolone antibiotics and their chlorination disinfection processes

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Journal of Environmental Sciences 2014年第9期26卷 1837-1842页

作者： Min Li Dongbin Wei Yuguo Du State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of Sciences University of Chinese Academy of Sciences

Acute toxicity of 21 quinolone antibiotics was monitored using photobacterium Vibriofischeri assay. The minimum IC20 （inhibitory concentration for 20% luminescence elimination） was obtained at the least 18.86 μmol/L for the tested quinolones. A quantitative structure-activity relationship model was established to investigate the possible mechanism for the acute toxicity. The critical physicochemical descriptors, describing a and atom electronegativity, implied that the electron transfer might occur between the quinolones and photobacterium V. fischeri. Although the quinolones exhibited limited acute toxicity to photobacterium, toxicity elevation was detected after their chlorination. Hence, chlorination disinfection treatment of quinolone-containing water should be of concerns.

关键词： QuinolonesAcute toxicityQSARMechanismChlorination

A synthetical methodology for identifying pr ior ity pollutants in reclaimed water based on meta-analysis

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Journal of Environmental Sciences 2022年第2期34卷 106-114页

作者： Feipeng Wang Dongbin Wei Miao Chen Shuang Peng Qiaorong Guo Xinyi Zhang Jun Liu Yuguo Du State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Wastewater reclamation and reuse is an increasing global project,while the reclamation treatment on wastewater does not completely remove all pollutants in water.The residual pollutants in reclaimed water would cause potential risk on human health and ecosystem safety during the long-term use.It is impossible to analyze and control all pollutants one by one in practice,therefore,identification and control of priority pollutants will be efficient strategy to ensure the safe use of reclaimed water.An integrated three-step methodology for identifying priority pollutants in reclaimed water was proposed in this study.First,a comprehensive literature survey on the occurrence of pollutants in reclaimed water was conducted,and a dataset D PR for pollutants occurrence in reclaimed water was established,containing 1,113 pollutants.Second,611 chemicals that had been recommended as hazardous pollutants for various water bodies in previous literatures were summarized,and a dataset D HP for hazardous pollutants in water was obtained.Third,meta-analysis on these two datasets(D PR and D HP)was performed,a new dataset D HPR for hazardous pollutants in reclaimed water was established,including 265 candidates.Finally,59 substances out of dataset D HPR were identified as priority pollutants for reclaimed water based on their recommendation frequency.It is expected that this synthetical methodology will provide powerful support for scientific evaluating and managing water pollution and ensuring safe use of reclaimed water.

关键词： Reclaimed water Priority pollutant Safe use Risk assessment Meta-analysis

Toxicity-based assessment of the treatment performance of wastewater treatment and reclamation processes

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Journal of Environmental Sciences 2012年第6期24卷 969-978页

作者： Dongbin Wei Zhuowei Tan Yuguo Du State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The reclamation and reuse of wastewater is one of the possible ways to relieve the serious fresh water resource crisis in China. Efficient reclamation treatment technologies ensure the safe reuse of reclaimed water. In order to screen out and evaluate technologies appropriate for reclamation treatment, a great deal of efforts have been brought to bear. In the present study, a toxicity-based method including a Photobacterium phosphoreum test for acute toxicity and SOS/umu test for genotoxicity, accompanied by the traditional physicochemical parameters DOC （dissolved organic carbon） and UV254 （absorbance at 254 nm）, was used to measure the treatment performance of different reclamation processes, including the anaerobic-anoxic-oxic biological process （A^2O） and subsequent physical/chemical reclamation processes （ultrafiltration, ozonation, chlorination）. It was found that for the secondary effluent after the Aao process, both the toxicity and physicochemical indices had greatly decreased compared with those of the influent. However, chemical reclamation processes such as ozonation and chlorination could possibly raise toxicity levels again. Fortunately, the toxicity elevation could be avoided by optimizing the ozone dosage and using activated carbon after ozonation. It was noted that by increasing the ozone dosage to 10 mg/L and employing activated carbon with more than 10 min hydraulic retention time, toxicity elevation was controlled. Furthermore, it was shown that pre-ozonation before activated carbon and chlorination played an important role in removing organic compounds and reducing the toxicity formation potential. The toxicity test could serve as a valuable tool to evaluate the performance of reclamation processes.

关键词： wastewater reclamation acute toxicity genotoxicity toxicity assessment

Acute toxicity formation potential of benzophenone-type UV filters in chlorination disinfection process

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Journal of Environmental Sciences 2014年第2期26卷 440-447页

作者： Qi Liu Zhenbin Chen Dongbin Wei Yuguo Du School of Material Science and Engineering Lanzhou University of Technology State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of Sciences State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of Technology

Benzophenones （BPs） are a class of widely used UV filters, which have been frequently detected within multiple environmental matrices. Disinfection is a necessary process in water treatment processes. The transformation behaviors and toxicity changes of 14 BP-type UV filters during chlorination disinfection treatment were investigated in this study. A new index, the acute toxicity formation potential, was proposed to evaluate the toxicity changes and potential risks of BP-type UV filters during chlorination treatment. It was found that 13 of 14 BP-type UV filters exhibited toxicity decreases in the chlorination disinfection process, more or less, while one showed a toxicity increase. The toxicity changes were dependent on substitution effects, such that 2,4-di-hydroxylated or 3-hydroxylated BPs exhibited significant toxicity decreases after chlorination treatment due to the ready cleavage of the aromatic ring. Importantly, the acute toxicity changes could be duplicated in an ambient water matrix.

关键词： acute toxicity formation potential benzophenones UV filters chlorination photobacterium assay

Data-Driven Modeling of Partially Observed Biological Systems

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Communications on Applied Mathematics and Computation 2024年第1期6卷 739-754页

作者： wei-Hung Su Ching-Shan Chou dongbin Xiu Department of Mathematics The Ohio State UniversityColumbusOH43221USA

We present a numerical approach for modeling unknown dynamical systems using partially observed data,with a focus on biological systems with(relatively)complex dynamical behavior.As an extension of the recently developed deep neural network(DNN)learning methods,our approach is particularly suitable for practical situations when(i)measurement data are available for only a subset of the state variables,and(ii)the system parameters cannot be observed or measured at all.We demonstrate that,with a properly designed DNN structure with memory terms,effective DNN models can be learned from such partially observed data containing hidden parameters.The learned DNN model serves as an accurate predictive tool for system analysis.Through a few representative biological problems,we demonstrate that such DNN models can capture qualitative dynamical behavior changes in the system,such as bifurcations,even when the parameters controlling such behavior changes are completely unknown throughout not only the model learning process but also the system prediction process.The learned DNN model effectively creates a“closed”model involving only the observables when such a closed-form model does not exist mathematically.

关键词： Deep neural network(DNN) Governing equation discovery Biological system Partial observation

A toxicity-based method for evaluating safety of reclaimed water for environmental reuses

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Journal of Environmental Sciences 2014年第10期26卷 1961-1969页

作者： Jianying Xu Chuntao Zhao Dongbin Wei Yuguo Du College of Resource Environment and Tourism Capital Normal University State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of Sciences

A large quantity of toxic chemical pollutants possibly remains in reclaimed water due to the limited removal efficiency in traditional reclamation processes. It is not enough to guarantee the safety of reclaimed water using conventional water quality criteria. An integrated assessment method based on toxicity test is necessary to vividly depict the safety of reclaimed water for reuse. A toxicity test battery consisting of lethality, genotoxicity and endocrine disrupting effect was designed to screen the multiple biological effects of residual toxic chemicals in reclaimed water. The toxicity results of reclaimed water were converted into the equivalent concentrations of the corresponding positive reference substances（EQC）. Simultaneously, the predicted no-effect concentration（PNEC） of each positive reference substance was obtained by analyzing the species sensitivity distribution（SSD） of toxicity data. An index ＂toxicity score＂ was proposed and valued as 1, 2, 3, or 4 depending on the ratio of the corresponding EQC to PNEC. For vividly ranking the safety of reclaimed water, an integrated assessment index ＂toxicity rank＂ was proposed, which was classified into A, B, C, or D rank with A being the safest. The proposed method was proved to be effective in evaluating reclaimed water samples in case studies.

关键词： Toxicity Safety Water quality Reclaimed water

The potential risk assessment for different arsenic species in the aquatic environment

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Journal of Environmental Sciences 2015年第1期27卷 1-8页

作者： Meng Du Dongbin Wei Zhuowei Tan Aiwu Lin Yuguo Du State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Water Quality Monitoring Center of Beijing Waterworks Group Company Limited

The different toxicity characteristics of arsenic species result in discrepant ecological risk.The predicted no-effect concentrations（PNECs） 43.65, 250.18, and 2.00 × 10^3μg/L were calculated for As（III）, As（V）, and dimethylarsinic acid in aqueous phase, respectively. With these PNECs, the ecological risk from arsenic species in Pearl River Delta in China and Kwabrafo stream in Ghana was evaluated. It was found that the risk from As（III） and As（V）in the samples from Pearl River Delta was low, while much high in Kwabrafo stream. This study implies that ecological risk of arsenic should be evaluated basing on its species.

关键词： Arsenic Species Predicted no-effect concentration Ecological risk assessment

A selective N,N-dithenoyl-rhodamine based fluorescent probe for Fe3+ detection in aqueous and living cells

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Journal of Environmental Sciences 2020年第4期32卷 180-188页

作者： Yi Liu Cuixia Zhao Xiangyun Zhao Huili Liu Yibin Wang Yuguo Du Dongbin Wei State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Marine Ecology and Environmental Science and Engineering First Institute of OceanographyMinistry of Natural Resources(China)Qingdao 266061China School of Chemistry and Chemical Engineering Yantai UniversityYantai 264005China Key Laboratory of Molecular Pharmacology and Drug Evaluation Ministry of EducationYantai UniversityYantai 264005China

A novel N,N-dithenoyl-rhodamine based fluorescent and colorimetric Fe3+probe 1 was designed and synthesized by only one step from Rhodamine B hydrazide and 2-thiophenecarbonyl chloride.The structure of probe 1 was characterized by 1 H NMR/13C NMR spectroscopy,IR spectroscopy,and HRMS spectrometry.Accompanying with significant changes in visual color and fluorescent spectrum,probe 1 displayed good sensitivity for Fe3+with an abroad pH span.The detection limit(3.76μmol/L,0.2 mg/L)for Fe3+was lower than WHO recommended value(0.3 mg/L)for drinking water.Using two thiophene carbonyl groups as coordinating functional recognition group,probe 1 showed excellent selectivity towards Fe3+over diverse coexistent metal ions and anions.The sensing mechanism between dithenoyl-substituted probe 1 and Fe3+was further confirmed by 1 H NMR and IR titration experiments,binding constants study,and Job’s plot analysis.Furthermore,probe 1 also exhibited good cell membrane permeability and could be used as an efficient Fe3+probe in living human cells.

关键词： N,N-dithenoyl-rhodamine Turn-on Fe3+determination Fluorescent probe Cell imaging