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Characteristics of rural domestic sewage discharge and their driving mechanisms: evidence from the Northern Region, China

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Frontiers of Environmental Science & Engineering 2024年第7期18卷 47-58页

作者： Jianguo Liu Ziyu Zhou Pengyu Li Zixuan Wang Ying Yan Xuezheng Yu Wenkai Li tianlong zheng Yingnan Cao Wenjun Wu Wenqian Cai Zhining Shi Junxin Liu Key Laboratory of Environmental Pollution Control and Remediation at Universities of Inner Mongolia Autonomous Region College of Resources and Environmental EngineeringInner Mongolia University of TechnologyHohhot 010051China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China SCEGC No.12 Construction Engineering Group Co. Ltd.Ankang 725000China State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation Chinese Academy of Environmental PlanningBeijing 100041China Technical Centre for Soil Agriculture and Rural Ecology and EnvironmentMinistry of Ecology and EnvironmentBeijing 100012China Sustainable Infrastructure and Resource Management(SIRM) UniSA STEMUniversity of South AustraliaSouth AustraliaMawson LakesSA 5095Australia

The traits of rural domestic sewage emission are unclear,negatively affecting rural domestic sewage treatment and sewage *** study used data from the Second National Pollution Source Census Bulletin to establish a data *** spatial distribution characteristics and main factors influencing rural sewage discharge in the Northern Region were studied using spatial autocorrelation analysis and structural *** findings demonstrated that(l)a significant Spearman correlation between drainage water volume(DwV),chemical oxygen demand(COD),ammonia nitrogen(NH_(3)-N),total nitrogen(TN),and total phosphorus(TP)and that the correlation coefficients between DWV and COD,NH,-N,TNand TP were 0.87**,1.0**,0.99**,0.99**,respectively;(2)rural sewage discharge showed spatial autocorrelation,and rural domestic sewage discharge in the districts and counties with an administration was significantly higher than in the surrounding areas;and(3)social development was the main driver rural domestic sewage changes(path coefficient was 0.407**),and the main factors influencing rural domestic sewage discharge were the urbanization rate,years of education,and population age *** study obtained the spatial variation law and clarified the main influencing factors of rural domestic sewage to provide data support and a theoretical basis for subsequent rural sewage collection and *** of the Inner Mongolia Autonomous Region in northern China as a typical case,provides a theoretical foundation for scientific decision-making on rural domestic sewage treatment at the national and regional levels and offers new perspectives for managing pollutants.

关键词： Rural domestic sewage Emission characteristics Spatial autocorrelation analysis Influencing factors

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Characteristics of sewer biofilms in aerobic rural small diameter gravity sewers

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Journal of Environmental Sciences 2020年第4期32卷 1-9页

作者： Wenkai Li tianlong zheng Yingqun Ma Junxin Liu State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Advanced Environmental Biotechnology Centre Nanyang Environment&Water Research InstituteNanyang Technological UniversitySingapore637141Singapore

Small diameter gravity sewers(SDGS)are extensively used to collect rural sewage as they are low in cost and quick to ***,the characteristics of biofilms in rural SDGS are still not *** this study,biofilms characteristics of aerobic rural SDGS were investigated using simulations in a lab under different flow conditions and *** indic ated that the average thickness of aerobic rural SDGS biofilms was in the range of 350-650μm,decreasing at locations with variable flow and high *** was the most abundant substance in extracellular polymeric substance of SDGS *** most abundant bacteria,Proteobacteria,Actinobacteria,and Bacteroidetes,and functional bacteria showed different distributions when analyzed through Illumina HiSeq sequencing of 16 S *** relative abundances of denitrifying bacteria,nitrite-oxidizing bacteria,and sulfate-reducing bacteria(SRB)were lower during variable flow than during stable *** slopes(15‰)decreased SRB presence,which could be used to mitigate H2 S accumulation in aerobic ***,this study describes the characteristics of aerobic rural SDGS biofilms and provides valuable suggestions for the optimal design of SDGS based on these characteristics.

关键词： Bacterial community Biofilms Functional bacteria Rural area Small diameter gravity sewers

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Experimental investigation on static/dynamic characteristics of a fast-response pressure sensitive paint

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Chinese Journal of Aeronautics 2018年第6期31卷 1198-1205页

作者： Ruiyu LI Limin GAO tianlong zheng Guanhua YANG School of Power and Energy Northwestern Polytechnical University Xi'an 710072 China Collaborative Innovation Center of Advanced Aero-Engine Beijing 100083 China

An optical-based technique using Pressure-Sensitive Paint（PSP） is a promising method to measure the distribution of surface pressure on an aerodynamic model. The static and dynamic characteristics of a fast-response PSP that is developed in the Chinese Academy of Sciences（CAS）are analyzed and tested to serve as the basis for experiments on unsteady surface measurement using a fast-response PSP. Two calibration systems used for this study are set up to investigate the temperature dependency, response time, and resolution. A data processing method, used for dynamic data, is analyzed and selected carefully to determine the optimum signal. Results show that the fastresponse PSP can be used normally at temperatures from 25 ℃ to 80 ℃. The effect of temperature on the accuracy of the measurement must be considered when temperatures are beyond the temperature range of 30–40 ℃. The dynamic calibration device with a solenoid valve can achieve a pressure jump within a millisecond order. The resolution is determined by the signal-to-noise ratio of the photo-multiplier tube. Results of the measurement show that the response time of the PSP decreases with a large pressure variation, and the response time is below 0.016 s when the pressure variation is under 40 kPa.

关键词： Dynamic calibration Pressure measurement Pressure sensitive paint Signal processing Unsteady flow

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Influencing Factors and Clustering Characteristics of COVID-19:A Global Analysis

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Big Data Mining and Analytics 2022年第4期5卷 318-338页

作者： tianlong zheng Chunli Zhang Yueting Shi Debao Chen Sheng Liu School of Computer Science and Technology Huaibei Normal UniversityHuaibei 235000China School of Economics and Management Tiangong UniversityTianjin 300000China

The unprecedented coronavirus disease 2019(COVID-19)pandemic is still raging(in year 2021)in many countries *** response strategies to study the characteristics and distributions of the virus in various regions of the world have been developed to assist in the prevention and control of this *** statistics and regression analysis on COVID-19 data from different countries were conducted in this study to compare and evaluate various regression *** showed that the extreme random forest regression(ERFR)model had the best performance,and factors such as population density,ozone,median age,life expectancy,and Human Development Index(HDI)were relatively influential on the spread and diffusion of COVID-19 in the ERFR *** addition,the epidemic clustering characteristics were analyzed through the spectral clustering *** visualization results of spectral clustering showed that the geographical distribution of global COVID-19 pandemic spread formation was highly clustered,and its clustering characteristics and influencing factors also exhibited some consistency in *** study aims to deepen the understanding of the international community regarding the global COVID-19 pandemic to develop measures for countries worldwide to mitigate potential large-scale outbreaks and improve the ability to respond to such public health emergencies.

关键词： data analysis extreme random forest regression spectral clustering HDI COVID-19

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Wastewater-nitrogen removal using polylactic acid/starch as carbon source： Optimization of operating parameters using response surface methodology

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Frontiers of Environmental Science & Engineering 2016年第4期10卷 137-146页

作者： Yan GUO Chuanfu WU Qunhui WANG Min YANG Qiqi HUANG Markus MAGEP tianlong zheng School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China

Nitrogen removal from ammonium-containing wastewater was conducted using polylactic acid （PLA）/ starch blends as carbon source and carrier for fimctional bacteria. The exclusive and interactive influences of operating parameters （i.e., temperature, pH, stirring rate, and PLA-to-starch ratio （PLA proportion）） on nitrification （Y1）, denitrification （Y2）, and COD release rates （Y3） were investigated through response surface methodology. Experimental results indicated that nitrogen removal could be successfully achieved in the PLA/starch blends through simultaneous mtnncatlon anti clenltnncatlon. The carbon release rate of the blends was controllable. The sensitivity of Y1, Y2, and Y3 to different operating parameters also differed. The sequence for each response was as follows： for Y1, pH 〉 stirring rate 〉 PLA proportion 〉 temperature; for Y2, PH 〉 PLA proportion 〉.temperature.〉 stirring rate; and for Y3, stirring rate 〉pH 〉 PLA proportion 〉 temperature. In this study, the following optimum conditions were observed： temperature, 32.0℃; pH 7.7; stirring rate, 200.0 r · min^-1 and PLA proportion 0.4. Under these conditions Y1 Y2 and Y3 were 134.0 μg-N·g-blend^-1·h^-1, 160.9μg-N-g-blend^-1·h^-1, and 7.6 × 10^3 μg-O·g-blend^-1·h^-1, respectively. These results suggested that the PLA/starch blends may be an ideal packing material for nitrogen removal.

关键词： Nitrogen removal Polylactic acid Starch Carbon source Response surface methodology

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Advanced treatment of wet-spun acrylic fiber manufacturing wastewater using three-dimensional electrochemical oxidation

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Journal of Environmental Sciences 2016年第12期28卷 21-31页

作者： tianlong zheng, Qunhui Wang Zhining Shi Yue Fang Shanshan Shi Juan Wang Chuanfu Wu Department of Environmental Engineering University of Science and Technology Beijing Beijing 100083 China. Beijing Key Laboratory on Resource-oriented Treatment of lndustrial Pollutants University of Science and Technology Beijing Beijing 100083 China School of Earth and Environmental Sciences The University of Adelaide South Australia 5005 Australia

A three-dimensional electrochemical oxidation （3D-EC） reactor with introduction of activated carbon （AC） as particle micro-electrodes was apphed for the advanced treatment of secondary wastewater effluent of a wet-spun acrylic fiber manufacturing plant. Under the optimized conditions （current density of 500 A/m2, circulation rate of 5 mL/min, AC dosage of 50 g, and chloride concentration of 1.0 g/L）, the average removal efficiencies of chemical oxygen demand （CODer）, NH3-N, total organic carbon （TOC）, and ultraviolet absorption at 254 nm （UV2s4） of the 3D-EC reactor were 64.5%, 60.8%, 46.4%, and 64.8%, respectively; while the corresponding effluent concentrations of CODcr, NH3-N, TOC, and UV2s4 were 76.6, 20.1, and 42.5 mg/L, and 0.08 Abs/cm, respectively. The effluent concentration of CODer was less than 100 mg/L, which showed that the treated wastewater satisfied the demand of the integrated wastewater discharge standard （GB 8978-1996）. The 3D-EC process remarkably improved the treatment efficiencies with synergistic effects for CODer, NH3-N, TOC, and UV2s4 during the stable stage of 44.5%, 38.8%, 27.2%, and 10.9%, respectively, as compared with the sum of the efficiencies of a two-dimensional electrochemical oxidation （2D-EC） reactor and an AC adsorption process, which was ascribed to the numerous micro-electrodes of AC in the 3D-EC reactor. Gas chromatography mass spectrometry （GC-MS） analysis revealed that electro- chemical treatment did not generate more toxic organics, and it was proved that the increase in acute biotoxicity was caused primarily by the production of free chlorine.

关键词： Advanced treatment Synergistic effect Three-dimensional electrochemicaloxidation Wet-spun acrylic fiber wastewater

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基于污水检查井的污染控制技术效果及机理分析

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环境工程学报 2024年第7期18卷 1937-1944页

作者：雷铭李文凯郑天龙庞正焘徐兵胡凡门颖欣陕西建工第十二建设集团有限公司安康725000 中国科学院生态环境研究中心北京100085 中国科学院大学北京100049 内蒙古工业大学呼和浩特010051

为深化对基于污水检查井的污染控制技术效果及机理的认知,构建了基于污水检查井的红砖处理系统、海绵处理系统和电解处理系统,分析了3种系统的污染物和有害气体控制能力及作用机理。结果表明:红砖处理系统、海绵处理系统、电解处理系统... 详细信息

为深化对基于污水检查井的污染控制技术效果及机理的认知,构建了基于污水检查井的红砖处理系统、海绵处理系统和电解处理系统,分析了3种系统的污染物和有害气体控制能力及作用机理。结果表明:红砖处理系统、海绵处理系统、电解处理系统均能有效控制水相污染物和气相恶臭(OU)、H_(2)S和CH_(4);红砖处理系统对悬浮物(SS)的去除能力较强,但其对有害气体的去除速率较慢;电解处理系统对化学需氧量、氨氮、总磷和硫化物的去除能力较强,且对有害气体的去除速率较快;海绵处理系统对污染物和有害气体的去除能力相对居中;3种处理系统的控制机理不同,除微生物代谢造成的污染物去除和有害气体控制以外,电解处理系统通过电絮凝效应实现了污染物和有害气体的快速控制,红砖处理系统通过物理截留效应提高了对SS的去除率。研究结果可为污染控制前置思路提供技术应用和反应机理参考。

关键词：检查井污染物有害气体电解控制技术

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Pilot-scale experiments on multilevel contact oxidation treatment of poultry farm wastewater using saran lock carriers under different operation model

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Journal of Environmental Sciences 2019年第3期31卷 336-345页

作者： tianlong zheng Peng Li Xiaoyu Ma Xiaohong Sun Chuanfu Wu Qunhui Wang Ming Gao State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Department of Environmental Engineering University of Science and Technology Beijing Xinkai Water Environmental Investment Co.Ltd Beijing Agro-Biotechnology Research Center Beijing Academy of Agriculture and Forestry Sciences

A pilot-scale multilevel contact oxidation reactors system, coupled with saran lock carriers,was applied for the treatment of poultry farm wastewater. The removal efficiencies of CODcr, ammonia, and the total nitrogen as well as the elimination performance of CODcr and total nitrogen along the three-level contact oxidation tanks under six designed operational models were investigated. Based on the performance of the nitrogen removal of the saran lock carriers and the distribution of anoxic–aerobic interspace under the suitable operation model, the mechanism of nitrogen removal of the system was also explored. The results revealed that the intermittent aeration under parallel model is the most suitable operation model, while the removal efficiencies of CODcr, ammonia, and the total nitrogen were 86.86%, 84.04%, and 80.96%, respectively. The effluent concentration of CODcr,ammonia, and the total nitrogen were 55.6 mg/L, 8.3 mg/L, and 12.0 mg/L, which satisfy both the discharge standard of pollutants for livestock and poultry breeding industry(GB18596–2001) and the first grade of the integrated wastewater discharge standard(GB 8978–1996). Moreover, the mechanism for the nitrogen removal should be attributed to the plenty of anoxic–aerobic interspaces of the biofilm and the three-dimensional spiral structure of the saran lock carriers, where the oxygen-deficient distribution was suitable for the happening of the simultaneous nitrification and denitrification process. Therefore, the multilevel contact oxidation tanks system is an effective pathway for the treatment of the poultry farm wastewater on the strength of a suitable operation model and novel carriers.

关键词： Multilevel contact oxidation tanks Nitrogen removal Mechanism Operation model Poultry farm wastewater Saran lock carriers

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基于废砖的农村污水处理型接户井参数优化研究

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工业水处理 2024年第7期44卷 125-131页

作者：李文凯石太年张超超冯荣虎成文虎郑天龙陕西建工第十二建设集团有限公司陕西安康725000 安康市科技资源统筹中心陕西安康725000 中国科学院生态环境研究中心北京100085

农村污水水量变化大,容易影响污水处理设施的正常运行,应用废砖构建农村污水处理型接户井能够实现污染控制前置,提高污水治理体系的稳定性,也能够实现农村建筑废弃物的资源化利用,前景广阔。但是,该技术的影响因素和参数选取尚不明确,... 详细信息

农村污水水量变化大,容易影响污水处理设施的正常运行,应用废砖构建农村污水处理型接户井能够实现污染控制前置,提高污水治理体系的稳定性,也能够实现农村建筑废弃物的资源化利用,前景广阔。但是,该技术的影响因素和参数选取尚不明确,影响其推广应用。为解决上述问题,采用小试和中试装置,结合材料表征、单因素分析和响应曲面分析等方法,对基于废砖的农村污水处理型接户井的废砖粒径影响、污染控制效果和参数优化过程开展研究。结果表明,基于废砖的农村污水处理型接户井具有良好的污水处理效果,0.5~<1.0 cm粒径的废砖碎块较为适用;填料高度、折流深度和跌水高度影响接户井的污染控制效果,随填料高度和折流深度的增加以及跌水高度的降低,污染物去除率升高;接户井在最优条件下的COD、悬浮物、氨氮、总氮和总磷去除率分别达58%、68%、60%、52%和58%,就地还田利用情景下填料高度宜为90 cm、折流深度宜为64 cm、跌水高度宜为12 cm。该研究可为农村污水的污染控制前置提供可行技术方案并为农村污水治理技术的进步提供参考。

关键词：农村污水接户井废砖污染控制响应曲面

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基于村庄分散度的农村生活污水治理模式量化分析

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环境工程学报 2024年第2期18卷 523-530页

作者：李桂兰严滢李鹏宇王紫轩周子玉郑天龙刘建国刘俊新内蒙古工业大学资源与环境工程学院环境污染控制与修复内蒙古自治区高等学校重点实验室呼和浩特010051 中国科学院生态环境研究中心水污染控制实验室北京100085 中国科学院大学北京100049

随着农村地区生活水平的提升,生活污水所含污染物成分趋于复杂化,未经处理就地排放对生态环境影响不容小觑。目前,农村生活污水治理模式种类多样,但决策方法缺乏科学依据。以内蒙古地区82个村落为研究对象。以自然村落为最小研究单元,... 详细信息

随着农村地区生活水平的提升,生活污水所含污染物成分趋于复杂化,未经处理就地排放对生态环境影响不容小觑。目前,农村生活污水治理模式种类多样,但决策方法缺乏科学依据。以内蒙古地区82个村落为研究对象。以自然村落为最小研究单元,利用村落宅基地占比、村落长宽比、周长、极限距离、坡度0°~8°占比和坡度标准差等指标,构建了居住密度决策树(准确率76%)以及地势决策树(准确率88%)。决策树所得结果通过二分类概率单位回归(Probit)分析(准确率87%),确定其村落集中或分散情况,进而选择适宜的村落污水治理模式(集中模式、纳管模式、分散模式、拉运模式、就地利用模式)。农村生活污水治理模式决策方法的确立决策指标的量化,为促进农村生活污水治理体系的发展、提升污水治理的有效性具有积极意义。

关键词：村庄分散度农村生活污水机器学习决策树治理模式

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