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Journal of environmental Sciences 2019年第2期31卷 267-277页

作者： Jianhua Li Min Zhang Zhiyin Ye Changming Yang key laboratory of yangtze river water environment of the ministry of education Tongji University

Low organic matter content and high heavy metal levels severely inhibit the anaerobic digestion(AD) of sewage sludge. In this study, the effect of added manganese oxidemodified biochar composite(MBC) on methane production and heavy metal fractionation during sewage sludge AD was examined. The MBC could increase the buffering capacity,enhance the methane production and degradation of intermediate acids, buffer the pH of the culture, and stabilize the sewage sludge AD process. The application of MBC positively impacted methane production and the cumulative methane yield increased up to 121.97%,as compared with the control. The MBC addition can improve metal stabilization in the digestate. An optimum MBC dose of 2.36 g was recommended, which would produce up to 121.1 L/kg volatile solids of methane. After the AD process, even though most of the metals accumulated in the residual solids, they could be transformation from the bio-available fractions to a more stable fraction. The total organic-and sulfide-bound and residual fraction content at a 3 g dose of MBC that is 0.12 g/g dry matter were 51.06% and 35.11% higher than the control, respectively. The results indicated that the application of MBC could improve the performance of AD and promote stabilization of heavy metals in sewage sludge post the AD process.

关键词： Sewage sludge Anaerobic digestion Manganese oxide-modified biochar (MBC) Methane production Heavy metals Chemical species

Application of the improved dung beetle optimizer,muti-head attention and hybrid deep learning algorithms to groundwater depth prediction in the Ningxia area,China

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 18-23页

作者： Jiarui Cai Bo Sun Huijun Wang Yi Zheng Siyu Zhou Huixin Li Yanyan Huang Peishu Zong Collaborative Innovation Center on forecast and Evaluation of Meteorological Disasters/key laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment ChangeNanjing University of Information Science and TechnologyNanjingChina Southern Marine Science and Engineering Guangdong laboratory(Zhuhai) ZhuhaiChina China Meteorological Administration Key Laboratory of Transportation MeteorologyNanjingChina Jiangsu Meteorological Observatory NanjingChina

Due to the lack of accurate data and complex parameterization,the prediction of groundwater depth is a chal-lenge for numerical *** learning can effectively solve this issue and has been proven useful in the prediction of groundwater depth in many *** this study,two new models are applied to the prediction of groundwater depth in the Ningxia area,*** two models combine the improved dung beetle optimizer(DBO)algorithm with two deep learning models:The Multi-head Attention-Convolution Neural Network-Long Short Term Memory networks(MH-CNN-LSTM)and the Multi-head Attention-Convolution Neural Network-Gated Recurrent Unit(MH-CNN-GRU).The models with DBO show better prediction performance,with larger R(correlation coefficient),RPD(residual prediction deviation),and lower RMSE(root-mean-square error).Com-pared with the models with the original DBO,the R and RPD of models with the improved DBO increase by over 1.5%,and the RMSE decreases by over 1.8%,indicating better prediction *** addition,compared with the multiple linear regression model,a traditional statistical model,deep learning models have better prediction performance.

关键词： Groundwater depth Multi-head attention Improved dung beetle optimizer CNN-LSTM CNN-GRU Ningxia

Study on transport of powdered activated carbon using a rotating circular flume

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Journal of Hydrodynamics 2013年第5期25卷 772-777页

作者：尹海龙邱敏燕徐祖信 key laboratory of yangtze river water environment Ministry of EducationTongji University State key laboratory of Pollution Control and Resource Reuse Tongji University

This study employed a rotating flume to examine the Powdered Activated Carbon （PAC） transport with water flow. The initial PAC concentration was 10 mg/L-30 mg/L, and PAC concentration versus time under a specified cross-sectional averaging fluid shear was observed. Results show that compared with PAC deposition in still water, PAC is depleted to zero faster under a fluid shear of 0.02 Pa, due to PAC agglomeration with the fluid shear. However, since PAC floc size only ranges from a single particle （2 μm） to approximate 6 μm, an increasing of instantaneous turbulent fluctuations could counteract the force of PAC floc settling downward, and as a result the steady PAC concentration increases with the increase of shear stress. It is found that the critical shear stress for PAC deposition is about 0.60 Pa, and further the PAC deposition probability is presented according to the experimental scenarios between 0.02 Pa and 0.60 Pa. Combining the PAC transport and deposition formula with PAC-pollutant removal model provides an insight into PAC deployment in raw water aqueduct for sudden open water source pollution.

关键词： cohesive sediment Powdered Activated Carbon (PAC) transport deposition

Development of integrated catchment and water quality model for urban rivers

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Journal of Hydrodynamics 2015年第4期27卷 593-603页

作者：薛重华尹海龙解铭 key laboratory of yangtze river water environment Ministry of Education Tongji University State key laboratory of Pollution Control and Resource Reuse Tongji University

This paper presents the development of an urban river water quality model which considers the physical-biochemical processes within rivers and the incorporated urban catchment rainfall-runoff process developed with the time-area method. Unlike other models that simulate the hydrological and receiving water quality processes in the rural areas of the watershed scale, the model developed here is typically efficient for simulating the water quality response to nonpoint loadings from urban drainage systems, where the hydrological process is disturbed by artificially pumped discharge in wet-weather periods. This model is employed to assess the river water quality restoration in Nanfei river in Hefei City, China, where the model is calibrated against the measured data（i.e., the COD, the BOD5, the NH3-N, and the DO） in 2010, and the model parameters are suggested. It is shown that the nonpoint pollutants from the urban catchments contribute 34%-47% of the total pollutant inputs（i.e., the COD, the BOD5, and the NH3-N）, despite their low flow component of 13.4%. Apart from the improvement of the wastewater treatment plant effluent（i.e., Grade IV of the Surface water Quality Standard）, a nonpoint loading reduction of 27.2%, 25.1%, and 35.3% of the COD, the BOD5, and the NH3-N are anticipated to meet the designated surface water quality standards of Grade V.

关键词： river water quality integrated model catchment modeling urban river Caohu Lake watershed nonpoint load

Synthesis of mesoporous Cu/Mg/Fe layered double hydroxide and its adsorption performance for arsenate in aqueous solutions

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Journal of environmental Sciences 2013年第5期25卷 944-953页

作者： Yanwei Guo Zhiliang Zhu Yanling Qiu Jianfu Zhao State key laboratory of Pollution Control and Resource Reuse Tongji University key laboratory of yangtze river water environment Ministry of EducationTongji University

The mesoporous Cu/Mg/Fe layered double hydroxide（Cu/Mg/Fe-LDH） with carbonate intercalation was synthesized and used for the removal of arsenate from aqueous *** Cu/Mg/Fe-LDH was characterized by Fourier transform infrared spectrometry,X-ray diffraction crystallography,scanning electron microscopy,X-ray photoelectron spectroscopy and *** of various physico-chemical parameters such as pH,adsorbent dosage,contact time and initial arsenate concentration on the adsorption of arsenate onto Cu/Mg/Fe-LDH were *** showed that it was efficient for the removal of arsenate,and the removal efficiency of arsenate increased with the increment of the adsorbent dosage,while the arsenate adsorption capacity decreased with increase of initial pH from 3 to *** adsorption isotherms can be well described by the Langmuir model with R 2 〉 *** adsorption kinetics followed the pseudo second-order kinetic *** ions such as HPO42-,CO32-,SO42and NO3could compete with arsenate for adsorption sites on the Cu/Mg/*** adsorption of arsenate on the adsorbent can be mainly attributed to the ion exchange *** was found that the synthesized Cu/Mg/Fe-LDH can reduce the arsenate concentration down to a final level of 〈 10 μg/L under the experimental conditions,and makes it a potential material for the decontamination of arsenate polluted water.

关键词： arsenate adsorption mesoporous layered double hydroxide anion exchange

Copper-catalyzed amide bond formation from formamides and carboxylic acids

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Chinese Chemical Letters 2015年第1期26卷 11-14页

作者： Hong-Qiang Liu Jun Liu Yang-Hui Zhang Chang-Dong Shao Jing-Xun Yu Department of Chemistry Tongji University key laboratory of yangtze river water environment Ministry of EducationTongji University

A highly efficient copper-catalyzed approach to form amide bonds from formamides and carboxylic acids was developed. This protocol shows broad substrate scopes and high yields in the presence of 1 mol% catalyst and 4.... 详细信息

关键词： Amides Formamides Carboxylic acids Copper Catalysis

Biosorption of clofibric acid and carbamazepine in aqueous solution by agricultural waste rice straw

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Journal of environmental Sciences 2013年第12期25卷 2384-2395页

作者： Zhanguang Liu Xuefei Zhou Xiaohua Chen Chaomeng Dai Juan Zhang Yalei Zhang key laboratory of yangtze water environment of ministry of education State Key Laboratory of Pollution Control and Resource ReuseTongji University

Due to their widespread use, clofibric acid （CA） and carbamazepine （CBZ） have been frequently detected simultaneously at relatively high concentrations in aquatic environments. In this study, agricultural waste rice straw was employed as a potentially low-cost, effective and easy-to-operate biosorbent （RSB） to remove CA and CBZ. The adsorption of both pharmaceuticals followed pseudo second-order kinetics, and intraparticle diffusion was an important rate-limiting step. The adsorption isotherms of both drugs were fit well with Freundlich model. The adsorption of CA onto RSB was exothermic and was more likely to be dominated by physical processes, while the adsorption of CBZ was endothermic. Solution pH was determined to be the most important factor for CA adsorption, such that the adsorption capacity of CA onto RSB increased with the decline of solution pH. In the lower range of solution pH below 3. l, the CA removal efficiency was enhanced with the increase of biosorbent dosage. The CBZ removal efficiency was enhanced with the increase of RSB dosage without pH control. The maximum adsorption capacities were 126.3 mg/g for CA and 40.0 mg/g for CBZ.

关键词： biosorption clofibric acid carbamazepine rice straw agricultural waste uniform design

Occurrence, polarity and bioavailability of dissolved organic matter in the Huangpu river,China

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Journal of environmental Sciences 2014年第9期26卷 1843-1850页

作者： Qianqian Dong Penghui Li Qinghui Huang Ahmed A.Abdelhafez Ling Chen key laboratory of yangtze river water environment of the ministry of education College of Environmental Science and EngineeringTongji University Soils Water and Environment Research InstituteAgricultural Research CenterGizaEgypt

Dissolved organic matter （DOM） plays an important role in biogeochemical cycles in aquatic ecosystem. To investigate the characteristics of DOM in Huangpu river {the last tributary of the yangtze river）, surface water samples were collected along the river from December 2011 to June, 2013. The concentrations of dissolved organic carbon （DOC）, the absorbance and fluorescence spectrum of DOM in water samples were measured. Fluorescent DOM in the Huangpu river was decomposed into four components by the parallel factor analysis （PARAFAC）, including one humic-like substance and three protein-like substances. It showed that high spatial variability of DOC concentration was observed in the upstream water compared to the downstream water, and so did the absorbance coefficients of chromophoric dissolved organic matter and the total fluorescence intensities of different PARAFAC components of DOM. Furthermore, there was a large difference between the polarity and bioavailability of DOM in the Huangpu river. Polar compounds dominated tyrosine-like component of fluorescent DOM in all seasons. Tryptophan-like and humic-like substances had more polar fraction in summer and autumn than those in winter, while aromatic protein-like materials had the highest polar fraction in winter. Almost all of fluorescent DOM components were refractory in spring, while less than 20% of fluorescent DOM in average were biodegradable within 4 weeks in other seasons. We concluded that the spatial variation in the abundance of DOM in the Huangpu river is mainly affected by the water discharges from the Hangjiahu Plain and the seasonal difference in polarity and bioavailability of DOM is largely determined by its origins.

关键词： Chromophoric dissolved organicmatterDissolved organic carbonPolarityBioavailabilityAbsorbance coefficientsFluorescence

Mixture Toxicities of Three Pesticides Having Different Time-Toxicity Profiles

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Chinese Journal of Chemistry 2014年第6期32卷 545-552页

作者： Mo Yu Shushen Liu Mengchao Wang Fu Chen Hanxiao Tang key laboratory of yangtze river water environment Ministry of EducationCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China

In the environment,chemical pollutants always exist as *** evaluate mixture toxicity,we should ex-amine the concentration ratios and the concentration levels of mixture components as well as the interactive time between the components and testing *** three pesticides,metribuzin(MET),dodine(DOD)and ri-domil(RID),as mixture components,Vibrio qinghaiensis sp.-Q67 as testing organism,and 96-well microplate as exposure experiment carrier,the luminescence inhibition toxicities of the pesticides and their binary mixtures at six exposure time points(0.25,2,4,8,12,and 16 h)were *** results showed that the three pesticides have different time-toxicity *** toxicity of MET increases over time,and those of DOD and RID show a slight decrease or increase in the first 4 h,respectively,and then remain unchanged to 16 *** toxicities of the binary mixtures consisting of the three pesticides depend on not only the mixture composition but also the exposure *** time-toxicity profiles of all rays in MET-DOD mixture system are U-shaped curves,those in MET-RID system are basically monotonically increased and those in DOD-RID system are basically monotonically ***-ever,our findings indicate that for the test substances,mixture toxicity can be predicted by the extended concentra-tion addition model.

关键词： mixture toxicity concentration addition direct equipartition ray design pesticide time-toxicity profile

STUDY ON THE EROSION RATE OF POWDERED ACTIVATED CARBON IN RAW water AQUEDUCT

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Journal of Hydrodynamics 2012年第3期24卷 442-449页

作者： YIN Hai-long YANG Yang XU Zu-xin ' State key laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China key laboratory of yangtze river water environment Ministry of Education Shanghai 200092 China

Growing interest in using Powdered Activated Carbon （PAC） in raw water aqueduct, as a method of polluted surface water treatment, raises the question of transport of PAC in the aqueduct, which is related to the potential PAC erosion along the aqueduct. By means of a recently developed re-circulating flume, erosion rates of PAC with the grain size of 230 meshes （less than 62μm） depending on shear stress and bulk density were the discussed with real-time measurement of suspended PAC concentration. Lateral cross sectional averaging shear stress was decided by the actual value in the raw water conveying aqueduct of upstream Huangpu river, Shanghai, China, smaller than 1.8 N＇m 2. As for the bulk density, it was measured with compacting times varying from 1 d to 15 d, equivalent to 1 550 kg/m3-1 800 kg/m3. Experiments were conducted for the shear stress and bulk density separately, so as to isolate and quantify the effects of one of the parameters. The results demonstrate that, for a particular PAC particle, the erosion rate increases with shear stress and decreases with bulk density as a function of power form. A product of powers of the lateral cross sectional averaging shear stress and bulk density to estimate PAC erosion rate is presented by approximating experimental data sets.

关键词： Powdered Activated Carbon (PAC) raw water aqueduct erosion rate shear stress bulk density