The Occurrence and Prevention of Filamentous Algae in Ecological Purification System of Micro-polluted Water

[ Objective ] The aim was to study the influence of filamentous algae on the process of water ecological purification. [ Method ] The occurrence mechanism of filamentous algae and its ecological system were summarized and analyzed. Considering the ecological purification in north- ern Jiangsu, the occurrence and prevention of filamentous algae in water, the method to prevent filamentous algae in polluted water was discussed. [ Result] The results showed that by measures of improving planting density, regular harvesting, and water flow state control before the filamentous algae blooming period, together with improving local pH value, light interference and ecological control during the blooming period, can effectively control the filamentous algae blooming. [ Condusion] The study of the happening mechanism of filamentous algae provided theoretical references and the technical basis in the work of filamentous algae prevention and control.

Integrated Prevention and Control System for Soil Erosion in Typical Black Soil Region of Northeast China

The black soil region of Northeast China is one of the most important food production bases and commodity grain bases in China. However, the continual loss and degradation of precious black soil resources has led to direct threats to national food security and regional sustainable development. Therefore, it is necessary to summarize integrated prevention and control experience of small watersheds in black soil region of Northeast China. Tongshuang small watershed, a typical watershed in rolling hills of typical black soil areas in Northeast China, is selected as the study area. Based on nearly 50 years' experience in prevention and control of soil and water loss, the structures and overall benefits of an integrated prevention and control system for soil and water loss are investigated. Then, the 'three defense lines' tri-dimensional protection system with reasonable allocation of different types of soil and water control measures from the hill top to gully is systematically analyzed. The first line on the top hill can weaken and block uphill runoff and sediment, hold water resources and improve soil property. The second line on the hill can truncate slope length, slow down the runoff velocity and reduce erosion energy. The third line in the gully is mainly composed of waterfall engineering, which can inhibit soil erosion and restore land resources. The 'three defense lines' system is feasible for soil and water loss control of small watersheds in the typical black soil region of Northeast China. Through the application of the in Tongshuang small watershed, There are effective improvements in ecological conditions in Tongshuang small watershed after the application of 'three defense lines' soil and water control system. Moreover, the integrated treatment paradigm for soil and water loss in typical black soil region is compared with that in loess region. The results of this study could offer references and experiences for other small watersheds in typical black soil region of Northeast China.

Research progress and application prospect of functional adhesive materials in the field of oil and gas drilling and production

By summarizing the composition,classification,and performance characterization of functional adhesive materials,the adhesion mechanisms of functional adhesive materials,such as adsorption/surface reaction,diffusion,mechanical interlocking,and electrostatic adsorption,are expounded.The research status of these materials in oil and gas drilling and production engineering field such as lost circulation prevention/control,wellbore stabilization,hydraulic fracturing,and profile control and water plugging,and their application challenges and prospects in oil and gas drilling and production are introduced comprehensively.According to the applications of functional adhesive materials in the field of oil and gas drilling and production at this stage,the key research directions of functional adhesive materials in the area of oil and gas drilling and production are proposed:(1)blending and modifying thermoplastic resins or designing curable thermoplastic resins to improve the bonding performance and pressure bearing capacity of adhesive lost circulation materials;(2)introducing low-cost adhesive groups and positive charge structures into polymers to reduce the cost of wellbore strengthening agents and improve their adhesion performance on the wellbore;(3)introducing thermally reversible covalent bond into thermosetting resin to prevent backflow of proppant and improve the compressive strength of adhesive proppant;(4)introducing thermally reversible covalent bonds into thermoplastic polymers to improve the temperature resistance,salt-resistance and water shutoff performance of adhesive water shutoff agents.

Legislative Countermeasures for Preventing and Controlling Water Pollution in Water-deficient Regions

The shortage of water resources is severe in Beijing. The shortage of eco-environmental water and the sewage discharge over the environmental capacity are main bottlenecks that restrict the improvement of water environment. The reuse of wastewater could not only reduce the discharge of pollutants,but it could also increase the consumption of eco-environmental water. Therefore the reuse of wastewater is an important approach to improve the water environmental quality. Combined with the formulation process of Regulations of Beijing on Prevention and Control of Water Pollution,the current situations of prevention and control of water pollution in Beijing,the discharge of pollutant,water environmental quality,the population and economic development and water resources and so on were analyzed. And the bottlenecks that restricted the improvement of water environmental quality were found. And the necessity of solving the control of water pollution by reusing the wastewater and ensuring the consumption of eco-environmental water was analyzed from the perspective of the control of water pollution. And some legislative countermeasures were put forward,which provided new ideas for solving the problem of the prevention and control of water pollution and improving the water environmental quality. It was of important reference values for local governments（ especially water-deficient regions） to make relative polices or plans of water pollution control and water environmental protection.

Site Selection of Waste Slag Yard and Design of Protective Measures in Water Supply Project of Drawing from the Songhua River in Central Cities of Jilin

Water supply project of drawing from the Songhua River in central cities of Jilin is taken as research object.On the basis of analyzing project characteristics and natural conditions of the project area,site selection of waste slag yard of water diversion project and design of water and soil conservation measures are discussed.Rationality of site selection of waste slag yard and pertinence of prevention and control measures of water and soil loss in waste slag yard are analyzed,and comprehensive utilization of waste slag in large-scale production and construction projects is explored.

Design of a water curtain to reduce accumulations of float coal dust in longwall returns

Accumulation of float coal dust(FCD)in underground mines is an explosion hazard that affects all underground coal mine workers.While this hazard is addressed by the application of rock dust,inadequate rock dusting practices can leave miners exposed to an explosion risk.Researchers at the National Institute for Occupational Safety and Health(NIOSH)have focused on developing a water curtain that removes FCD from the airstream,thereby reducing the buildup of FCD in mine airways.In this study,the number and spacing of the active sprays in the water curtain were varied to determine the optimal configuration to obtain peak knockdown efficiency(KE)while minimizing water consumption.

WATER POLLUTION IN CHINA:CURRENT STATUS, FUTURE TRENDS AND COUNTERMEASURES

Based on the statistical data related to water pollution in recent years, this paper firstly describes in detail the current status of water pollution and water quality in rivers, lakes, reservoirs, groundwater and coastal waters in China, then makes a comprehensive analysis on future trends of water pollution in China. The authors hold that the economic power, technology level and management level have determinative influences on the current status and future trends of water pollution. At last, this paper discusses briefly the policies and measures for preventing and controlling water pollution in the light of the national conditions.

水-气耦合下的土质边坡稳定系数场分析

传统边坡稳定性分析方法仅对潜在滑动面进行整体稳定性评估,无法获取各点的安全系数.基于稳定系数场理论,综合考虑水-气耦合作用,对降雨条件下边坡稳定性进行分析.结果表明:1)稳定系数场法能够直观地体现水-气耦合作用下边坡的具体破坏区域,得到各点的安全系数;2)孔隙气压力对边坡降雨入渗有一定阻碍作用,并且随着降雨时间的推移阻渗效果愈明显,相同条件下降雨40 h时,两相流湿润锋深度较单向流减小了28.6%;3)相同条件下,考虑水-气耦合作用将降低边坡稳定性,以降雨40 h为例,两相流边坡失稳面积约为单向流的1.7倍.因此,在实际工程中对边坡稳定性分析时考虑水-气耦合作用,工程偏于安全.

考虑采动效应的闭坑矿井水硫酸盐污染规律

高硫煤矿闭坑后成为埋藏在地表以下深部的产酸污染场,对相邻含水层和周边环境造成了潜在危害,且因采动效应影响和矿井空间分布复杂导致相邻含水层的污染过程与污染程度评价困难。以某闭坑矿区为研究对象,选取SO_(4)^(2-)作为特征污染物,考虑多煤层采动裂隙对含水层结构的破坏影响,运用数值模拟技术对闭坑矿区酸性矿井水中SO_(4)^(2-)污染迁移特征进行研究,并分析流体扩散系数对含水层污染物运移的影响。结果表明:SO_(4)^(2-)在二叠系童子岩组砂岩含水层中水平迁移面积随时间增大而增大,增大速率逐渐减小,垂向渗透系数扩大10倍,空间变异性增强;闭坑5、10、15a后,最大水平迁移距离分别为215、414、612m,最大垂向迁移距离分别达到50、65、70m;而扩散系数越大,产酸时间越长,SO_(4)^(2-)迁移距离和污染范围将随之增大,相较于水平方向,垂向上SO_(4)^(2-)浓度变化对扩散系数的敏感度更高。基于模拟结果,结合闭坑矿区实际条件,针对性提出了“源头减量-过程阻断-末端治理”的综合防控与治理方案。研究结果将为该闭坑煤矿酸性矿井水污染治理与防控提供理论基础,也为其他同类矿井提供科学借鉴。

盾构井底板混凝土温控参数敏感性分析

以珠江三角洲水资源配置工程的典型盾构井底板为例,采用saptis三维有限元软件,进行浇筑温度和通水冷却温控参数敏感性分析。结果表明,高温季节降低浇筑温度有利于控制混凝土内部最高温度,浇筑温度每增高1℃,内部最高温度增加约0.79℃,建议将浇筑温度降低至23℃;优化通水冷却参数(加密冷却水管,降低通水水温,适当延长通水时长)能达到良好的温控防裂效果。

干部考核标准化线上评议系统的研究和应用

本研究旨在探讨计算机和网络技术在政务部门的标准化应用情景研究,通过设计、研发、应用干部考核标准化线上评议系统,并在疫情特殊环境下得到应用,实现既符合疫情人群不聚集的要求,又加快推进线上考核评议工作标准化的进程,本文对其研究与应用进行了讨论和分析。这些结果对于深入理解政务业务标准化具有重要意义。

2022年省、市、县疾控机构106项水质指标检测能力调查与分析

目的了解2022年省、市、县疾控机构(Center for Disease Control and Prevention,CDC)对《生活饮用水卫生标准》(GB 5749-2006)中规定的106项指标的检测能力,分析省、市、县各指标检测能力不足的主要原因。方法收集2022年度全国各级CDC水质检测能力数据,对省级、地市级CDC的42项常规指标、64项非常规指标和对县级CDC的42项常规指标不具备检测能力的机构占比及不能检测的原因占比进行分析。结果省级CDC检测能力不足主要体现在总α放射性、总β放射性(4个省级,占比14%)和贾第鞭毛虫、隐孢子虫(6个省级,21%),主要原因均为设备配置不到位(100%),其次是无检测人员(50%~75%)。地市级CDC常规指标检测能力不足主要体现在总α放射性和总β放射性,占比均为47%;其次是消毒剂指标和消毒副产物指标(臭氧、总氯、ClO_(2)、甲醛、溴酸盐、亚氯酸盐和氯酸盐),占比为6%~22%,不具备检测能力的原因包括无设备、无标准品、无试剂和无检测人员;非常规指标中,除了氨氮(1%)外的63项指标不具备检测能力的机构占比均≥19%,其中贾第鞭毛虫和隐孢子虫不具备检测能力的机构占比最高(65%),主要原因为无设备(88%),其次为无检测人员(42%~43%)、无试剂(40%)和无标准品(38%);其余61项指标不能检测的原因为无设备、无标准品、无试剂和无检测人员(占比分别为60%~76%、45%~62%、42%~53%、51%~67%)。县级CDC常规指标中,放射性指标检测能力最弱(总α放射性和总β放射性,占比均为85%),其次是消毒剂指标和消毒副产物指标(臭氧、总氯、ClO_(2)、甲醛、溴酸盐、氯酸盐、亚氯酸盐、四氯化碳和三氯甲烷),不具备检测能力的主要原因以无设备(83%~94%)和无检测人员(53%~76%)为主。结论省、市、县CDC常规指标检测能力不足主要体现在放射性指标(省、市、县CDC),消毒剂指标(臭氧、总氯、ClO_(2))、消毒副产物指标(甲醛、溴酸盐、亚氯酸盐、氯酸盐)(市、县CDC),以及四氯化碳、三氯甲烷(县CDC);非常规指标中氨氮检测能力较好(省、市CDC),检测能力不足主要体现在贾第鞭毛虫和隐孢子虫(省、市CDC),及其他指标(市CDC)。检测能力不足的主要原因是设备配置不到位,今后应该重点从增配设备着手,增强水质检测能力。

河套灌区农业高效节水与面源污染防控技术

针对河套灌区水资源短缺、农业面源污染严重等问题,从不同空间尺度和治理环节入手开展灌区农业高效节水与面源污染源头防控技术研究。研发了针对污染源头的农田水肥盐药调控管理技术模式(包括除草剂残留研究与用量推荐、土壤水氮盐和作物生长对水肥管理的响应、减量膜上秋浇技术及次生盐渍化土壤微生物改良技术)、针对农田排水的富氧生态沟渠截污净化技术模式和区域尺度的面源污染空间解析识别技术,并集成构建了贯穿源头控污—过程削污—区域查污—系统调污的高效节水型农业面源污染防控技术体系。基于现状研究和新发展理念提出了河套灌区水土资源领域研究的几点认识,相关成果为河套灌区高质量发展提供了重要支撑,对同类型灌区具有重要借鉴意义。

海河流域水土流失空间分布特征及防治对策

基于2020年海河流域水土流失动态监测成果,计算县级行政区土壤侵蚀严重指数,分析流域水土流失面积及分布特征等,提出水土流失综合防治对策。流域水土流失面积占土地总面积的20.84%,占山区土地面积的34.21%;土壤侵蚀严重的县级行政区有5个,较严重的有63个;水土流失分布主要集中在永定河上游黄土丘陵区、太行山土石山区、冀北燕山石质山区和燕山北部坝上风沙区等区域。水土流失发生重点地类以旱地、有林地、其他草地、灌木林地和天然牧草地为主,呈现面积不大但相对集中、危害大的特点;生产活动频繁导致水土流失仍然严重,土壤侵蚀强度不高,但治理难度大。当前,水土流失依然是海河流域主要生态问题之一,水土流失防治应结合区域水土流失特点科学布局,系统配置各类措施,推进流域水土流失治理高质量发展。

机器学习方法在矿井水防治理论体系研究中的应用思考

致灾机理、危险性评价、灾变预测共同构成矿井水防治理论体系基本内容,其在过去20多年里快速发展,目标是理解矿井水行为特征,预测演化趋势,服务矿区水害防治工作。机器学习是大数据时代进行数据分析和挖掘的有力工具。将机器学习应用于矿井水防治理论体系研究,已得到相对广泛的关注。针对理论体系的3项基本内容,重点讨论了机器学习在各内容建设中的具体应用,主要包括:根据不同水害类型分类简述致灾机理研究现状,指出机器学习应用暂为空白的原因为其不具备做出假设的能力。认为未来致灾机理研究方法依然以传统方法(理论分析、数值模拟、相似模拟等)为主,机器学习促进地质数据获取与处理,对机理研究作出贡献;分析方法优势,指出机器学习作用于危险性评价的主要方式为非结构化数据的处理及丰富评价方法;分析基于物理和基于数据的单一预测模式弊端,论述物理模型与数据驱动相结合的必要性,相应给出“模型-数据”双驱动预测模式的3种实现形式,并讨论了基于图像的灾变预测方法可行性。随着生产数据及地质数据的丰富,机器学习方法可推动理论体系研究快速发展,并为矿井水防治学科系统方法论研究作出贡献。

我国不同类别煤层顶板水害致灾机理与防控路径

我国是世界上成煤和赋存条件最复杂的国家,煤层顶板水文地质条件的多样性和复杂性,采动覆岩裂隙场与渗流场耦合的相互性和时变性以及煤层顶板突水的独特性和危害性,造成顶板水害是我国尤其是西部煤矿区的主要矿井灾害之一。为了更好地认识顶板水害和推广现有技术和探索新技术防控此类矿井灾害,在全面分析近年来我国煤层顶板水害事故规律与顶板充水含水层的赋存条件、突水模式、动力特征、力学行为等基础上,系统划分了顶板水害的类型、特征、主要类别的致灾机理及梳理了现有顶板水害的防治技术,并展望了未来顶板水害防治领域的发展方向。研究发现:①顶板水害主体架构包括巨厚基岩含水层涌(淋)水、薄基岩弱胶结层水-砂耦合溃涌、离层空间蓄水储能突水、天窗补给型突水、围岩烧变增透致突等5种类别,集中分布于秦岭—淮河沿线以北地区,陕、蒙、宁是顶板水害主要聚集地。②采动诱发巨厚基岩含水层下覆岩原生裂隙互馈-贯通发育“Z”型离层空间,导致采场出现大面积涌(淋)水现象;基于复合关键层破断力学条件,阐明了薄基岩弱胶结层水-砂耦合溃涌致灾的动力源;构建了离层失稳突水临界判别准则,将离层突水划分为静载扰动、“动+静”载复合扰动、复合煤层开采重复扰动3种模式;红土隔水层缺失及红土薄弱区采动劣化损伤是产生天窗越流补给的主要根源;围岩烧变增透,孔隙度增大,接受临近水源补水后形成新的含水结构体,在采动诱发下烧变岩水涌入采场发生水害事故。③梳理了当前煤层顶板水害“探-放-治”三位一体的解危防控技术体系,提出了井上下共轭联动、钻-采(掘)高位协同地质勘探系统,以防治水“三区”划分为导向的地质保障工作,“煤-水-生态”多目标齐抓共管的绿色开采和防治水理念,以及数智化、透明化矿山水文地质灾害信息维护系统等未来发展方向。

我国水污染防治资金项目成效、管理经验与优化实施建议

水污染防治资金自2015年设立以来,中央和地方政府部门在加强与规范资金项目管理方面开展了大量工作,为提高资金使用效益发挥了重要作用。但目前针对水污染防治资金项目管理的研究较少,也缺少相关经验做法总结。基于环境状况公报、绩效评价等数据,分析了项目在推动水质改善、促进生态修复、建立长效机制、带动社会投入等方面取得的成效;从资金投向、项目谋划、资金分配、资金使用、绩效评价等方面梳理总结了水污染防治资金设立以来的项目管理经验,并通过调研提炼了部分省(区)在制度建设、项目谋划、过程监管、绩效管理等方面的典型做法;同时,分析了现阶段水污染防治资金项目管理存在的资金支持范围有待拓宽、项目谋划系统性有待提升、技术保障有待加强、绩效管理有待优化等问题。为进一步提升资金项目管理水平、提高资金使用效益,提出如下建议:结合新时期水生态环境保护重点任务和地方实际需求,合理拓宽资金支持范围;坚持流域统筹,提升项目谋划系统性;制定完善技术指导文件,强化技术保障;完善绩效管理制度,加强成效监管。

广东省北江流域防洪体系与布局优化

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