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Controllable chemical redox reactions to couple microbial degradation for organic contaminated sites remediation:A review

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Journal of Environmental Sciences 2024年第5期139卷 428-445页

作者： Bin Chen Jiang Xu lizhong zhu College of Environmental and Resource Sciences Zhejiang UniversityHangzhou 310058China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Zhejiang UniversityHangzhou 310058China Zhejiang Agriculture&Forest University Lin'an 311300China

Global environmental concern over organic contaminated sites has been progressively conspicuous during the process of urbanization and industrial *** traditional physical or chemical remediation technologies may significantly destroy the soil structure and function,coupling moderate chemical degradation with microbial remediation becomes a potential way for the green,economic,and efficient remediation of contaminated ***,this work systematically elucidates why and how to couple chemical technology with microbial remediation,mainly focused on the controllable redox reactions of organic *** rational design of materials structure,selective generation of reactive oxygen species,and estimation of degradation pathway are described for chemical ***,current progress on efficient and selective reductions of organic contaminants(i.e.,dechlorination,defluorination,-NO_(2) reduction)is *** with the microbial remediation of contaminated sites,several consideration factors of how to couple chemical and microbial remediation are proposed based on both fundamental and practical points of *** review will advance the understanding and development of chemical-microbial coupled remediation for organic contaminated sites.

关键词： Soil remediation Groundwater remediation Rational design Reactive species Environmental nanotechnology

Pollution characteristics and source apportionment of heavy metal(loid)s in soil and groundwater of a retired industrial park

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Journal of Environmental Sciences 2024年第9期143卷 23-34页

作者： Zijing Xiang Shijin Wu lizhong zhu Kun Yang Daohui Lin Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Department of Environmental SciencesZhejiang UniversityHangzhou 310058China Zhejiang Ecological Civilization Academy Anji 313300China

Heavy metal(loid)s(HMs)pollution has become a common and complex problem in industrial parks due to rapid industrialization and ***,soil and groundwater were sampled from a retired industrial park to investigate the pollution characteristics of *** show that Ni,Pb,Cr,Zn,Cd,and Cu were the typical HMs in the *** analysis with the positive matrix factorization model indicates that HMs in the topsoil stemmed from industrial activities,traffic emission,and natural source,and the groundwater HMs originated from industrial activities,groundwater-soil interaction,groundwater-rock interaction,and atmosphere *** sequential extraction of soil HMs reveals that As and Hg were mainly distributed in the residue fraction,while Ni,Pb,Cr,Zn,Cd,and Cu mainly existed in the mobile *** HMs either in the total concentration or in the bioavailable fraction preferred to retain in soil as indicated by their high soil-water partitioning coefficients(K_(d)),and the K_(d) values were correlated with soil pH,groundwater redox potential,and dissolved *** relative stable soil-groundwater circumstance and the low active fraction contents limited the vertical migration of soil HMs and their release to *** findings increase our knowledge about HMs pollution characteristics of traditional industrial parks and provide a protocol for HMs pollution scrutinizing in large zones.

关键词： Heavy metal(loid)s Industrial park Source apportionment Chemical fraction Soil-groundwater partitioning

Removal of polycyclic aromatic hydrocarbons and phenols from coking wastewater by simultaneously synthesized organobentonite in a one-step process

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Journal of Environmental Sciences 2012年第2期24卷 248-253页

作者： Zhenhua Wu lizhong zhu Department of Environmental Science Zhejiang University Hangzhou 310028 China Zhejiang Provincial Key Laboratory of Organic Pollution Process Control Hangzhou 310028 China

The optimal condition for a one-step process removing organic compounds from coking wastewater by simultaneously synthesized organobentonite as a pretreatment was *** showed that sorption of organic compounds by organobentonite was positively correlated to the cation surfactant exchange on the bentonite and the octanol-water partition coefficient（Kow） of the *** 0.75 g/L bentonite and 180 mg/L（60% of bentonite cation exchange capacity） cetyltrimethylammonium bromide,the removal efficiencies of the 16 polycyclic aromatic hydrocarbon（PAHs） specified by the US Environmental Protection Agency in coking wastewater except naphthalene were more than 90%,and that of benzo（a）pyrene was 99.5%.At the same time,the removal efficiencies of CODCr,NH3-N,volatile phenols,colour and turbidity were 28.6%,13.2%,8.9%,55% and 84.3%,respectively,and the ratio of BOD5/CODCr increased from 0.31 to *** results indicated that the one-step process had high removal efficiency for toxic and refractory hydrophobic organic compounds,and could improve the biodegradability of the coking *** it could be a promising technology for the pretreatment of toxic and refractory organic wastewater.

关键词： one-step process coking wastewater bentonite surfactant sorption

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基于深度学习的图像双分支修复算法

通信与信息技术 2024年第5期 14-18,55页

作者：朱立忠佟昕沈阳理工大学辽宁沈阳110159

受传统的图像修复网络启发,提出一种基于深度学习的图像双分支修复算法。将图像的修复过程分为两个部分,一个是修复结构化缺陷部分的全局分支,另一个是修复非结构化缺陷部分的局部分支。首先,用残差模块搭建总体网络。然后,在残差模块... 详细信息

受传统的图像修复网络启发,提出一种基于深度学习的图像双分支修复算法。将图像的修复过程分为两个部分,一个是修复结构化缺陷部分的全局分支,另一个是修复非结构化缺陷部分的局部分支。首先,用残差模块搭建总体网络。然后,在残差模块前加入压缩激励模块Squeeze-and-Excitation(SE)构建局部分支。最后,引入一种注意力机制上下文转换器块Contextual Transformer(CoT)来统计图像中完好的全局信息以进行图像的结构性缺陷修复,构建全局分支。实验结果表明,该方法修复的图片有0.02的SSIM增益,0.23dB的PSNR提升,优于其他现有的图像修复方法的视觉质量和数值指标,能有效地改善修复性能。

关键词：图像修复深度学习双分支修复注意力机制

Effect of central ventilation and air conditioner system on the concentration and health risk from airborne polycyclic aromatic hydrocarbons

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Journal of Environmental Sciences 2013年第3期25卷 531-536页

作者： Jinze Lv lizhong zhu Department of Environmental Science Zhejiang University Zhejiang Province Key Laboratory of Organic Pollution Process and Control

Central ventilation and air conditioner systems are widely utilized nowadays in public places for air exchange and temperature control,which significantly influences the transfer of pollutants between indoors and *** study the effect of central ventilation and air conditioner systems on the concentration and health risk from airborne pollutants,a spatial and temporal survey was carried out using polycyclic aromatic hydrocarbons （PAHs） as agent *** the period when the central ventilation system operated without air conditioning （AC-off period）,concentrations of 2-4 ring PAHs in the model supermarket were dominated by outdoor levels,due to the good linearity between indoor air and outdoor air （rp〉0.769,p〈0.05）,and the slopes （1.2-4.54） indicated that ventilating like the model supermarket increased the potential health risks from low molecular weight *** the period when the central ventilation and air conditioner systems were working simultaneously （AC-on period）,although the total levels of PAHs were increased,the concentrations and percentage of the particulate PAHs indoors declined *** BaP equivalency （BaPeq） concentration indicated that utilization of air conditioning reduced the health risks from PAHs in the model supermarket.

关键词： particulate gaseous PAHs health risk public place

Optimized porous clay heterostructure for removal of acetaldehyde and toluene from indoor air

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Frontiers of Environmental Science & Engineering 2016年第2期10卷 219-228页

作者： Pu ZHAO lizhong zhu Department of Environmental Science Zhejiang University Hangzhou 310058 China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Hangzhou 310058 China

Adsorption is the most widely used technology for the removal of indoor volatile organic compounds （VOCs）. However, existing adsorbent-based technologies are inadequate to meet the regulatory requirement, due to their limited adsorption capacity and efficiency, especially under high relative humidity （RH） conditions. In this study, a series of new porous clay heterostructure （PCH） adsorbents with various ratios ofmicropores to mesopores were synthesized, characterized and tested for the adsorp- tion of acetaldehyde and toluene. Two of them, PCH25 and PCH50, exhibited markedly improved adsorption capabil- ity, especially for hydrophilic acetaldehyde. The improved adsorption was attributed to their large micropore areas and high micropore-to-mesopore volume ratios. The amount of acetaldehyde adsorbed onto PCH25 at equilibrium reached 62.7 mg. g-l, eight times as much as the amount adsorbed onto conventional activated carbon （AC）. Even at a high RH of 80%, PCH25 removed seven and four times more of the acetaldehyde than AC and the unmodified raw PCHs did, respectively. This new PCH optimized for their high adsorption and resistance to humidity has promising applications as a cost-effective adsorbent for indoor air purification.

关键词： porous clay heterostmcture volatile organiccompounds adsorption adsorbent indoor air

Sorption of phenanthrene to biochar modified by base

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Frontiers of Environmental Science & Engineering 2018年第2期12卷 5-15页

作者： Zhengjun Feng lizhong zhu Department of Environmental Science Zhejiang University Hangzhou 310058 China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Hangzhou 310058 China

Biochar （BC） is a potential material for removal of polycyclic aromatic hydrocarbons t^om soil and water, and base modification is a promising method for improving its sorption ability. In this study, we synthesized a series of base-modified biochars, and evaluated their sorption of phenanthrene. Original biochars were produced by pyrolysis of three feedstocks （rice straw, wood and bamboo） at five temperatures （300~C, 350~C, 400~C, 500~C and 700~C）. Base-modified biochars were further obtained by washing ofbiochars with base solution. The base soluble carbon （SC） was extracted from the supernatant, which were only obtained from biochars pyrolyzed at low temperatures （〈 500~C） and the content was decreased with the increase of pyrolysis temperature. The SC content between different feedstocks followed the trend office straw〉wood〉bamboo when same pyrolysis conditions were applied, It was tbund that base modification improved the sorption of phenanthrene on biochars that SC could be extracted from （extractable-BCs）. However, base treatment but had limited effects for biochars that no SC could be extracted from. It suggested that base modification improved the sorption of phenanthrene to extractable-BCs by removing the SC and thus increasing the surface area and hydrophobicity. Therefore, base modification was suggested to be used in modifying extractable-BCs.

关键词： BiocharBase modificationPhenanthrene

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基于注意力机制和特征融合的交通标志检测

信息技术与信息化 2024年第9期 5-8页

作者：韩姗朱立忠沈阳理工大学自动化与电气工程学院辽宁沈阳110159

针对复杂背景信息下不易察觉或相对尺寸较小的交通标志目标,提出一种改进Faster R-CNN的新检测算法。首先,用ResNet50深度残差网络替代VGG16作为基本网络模型,同时在基础网络中嵌入混合注意力机制,使网络专注强化关键位置的信息,抑制无... 详细信息

针对复杂背景信息下不易察觉或相对尺寸较小的交通标志目标,提出一种改进Faster R-CNN的新检测算法。首先,用ResNet50深度残差网络替代VGG16作为基本网络模型,同时在基础网络中嵌入混合注意力机制,使网络专注强化关键位置的信息,抑制无效背景信息对网络的干预,从而加强网络对重要特征的提取;其次,提出改进特征金字塔网络结构进行多尺度融合上下文信息的方法,利用特征层之间的关联性减少低像素小目标的信息损失。改进后的算法在CCTSDB数据集上的实验取得了95.6%的平均检测精度,较原Faster R-CNN网络的检测精度提高了5.1%,鲁棒性增强。

关键词：交通标志检测 Faster R-CNN 残差网络注意力机制特征金字塔

Tricrystalline TiO_2 with enhanced photocatalytic activity and durability for removing volatile organic compounds from indoor air

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Journal of Environmental Sciences 2015年第6期27卷 189-195页

作者： Kunyang Chen lizhong zhu Kun Yang Department of Environmental Science Zhejiang University Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control

It is important to develop efficient and economic techniques for removing volatile organic compounds（VOCs） in indoor air. Heterogeneous Ti O2-based semiconductors are a promising technology for achieving this goal. Anatase/brookite/rutile tricrystalline Ti O2 with mesoporous structure was synthesized by a low-temperature hydrothermal route in the presence of *** obtained samples were characterized by X-ray diffraction and N2 adsorption-desorption isotherm. The photocatalytic activity was evaluated by photocatalytic decomposition of toluene in air under UV light illumination. The results show that tricrystalline Ti O2 exhibited higher photocatalytic activity and durability toward gaseous toluene than bicrystalline Ti O2,due to the synergistic effects of high surface area, uniform mesoporous structure and junctions among mixed phases. The tricrystalline Ti O2 prepared at R HNO3= 0.8, containing80.7% anatase, 15.6% brookite and 3.7% rutile, exhibited the highest photocatalytic activity,about 3.85-fold higher than that of P25. The high activity did not significantly degrade even after five reuse cycles. In conclusion, it is expected that our study regarding gas-phase degradation of toluene over tricrystalline Ti O2 will enrich the chemistry of the Ti O2-based materials as photocatalysts for environmental remediation and stimulate further research interest on this intriguing topic.

关键词： VOC Photocatalysis Tricrystalline TiO2 Nanomaterials Mesoporous Gaseous