微生物絮凝剂产生菌的筛选

从废水、土壤、活性污泥中筛选到2株絮凝剂产生菌。参照伯杰氏手册进行菌种分类鉴定,初步确定均属氮单胞菌属（Azomonas sp.)。将Azomonas sp.在产絮凝剂的培养基中进行发酵培养后,测定其对高岭土悬浮液的絮凝活性。废水絮凝实验表明,该菌种所产絮凝剂絮凝效果明显,可絮凝各种水溶液中的悬浮物质。     

Biochar reduces cadmium accumulation in rice grains in a tungsten mining area-field experiment: effects of biochar type and dosage,rice variety,and pollution level

Environmental Geochemistry and Health - Cadmium (Cd)-contaminated rice (Oryza sativa) in Southern China is a great threat to food security, and the paddy soil remediation is urgently needed to...     

Studies on Classification of Recreational Fishery Resources and Evaluation on its Development

Recreational fishery is the combination of traditional fishery and modern leisure activities. Development of recreational fishery resources must be based on related resources, but the present research on recreational fishery is mainly confined to the development of leisure projects, the definition of connotation and scope of recreational fishery resources is rather vague, and there is no precise classification and evaluation system. According to the resources attributes, resources functions, and tourism resources classification, investigation and evaluation standard, recreational fishery resources include a number of different types. Expert Scoring Method and Analytic Hierarchy Process can be used to determine the evaluation factors of recreational fishery resources and their weights, and then make comprehensive evaluation on recreational fishery resources of different regions and types, so as to improve the scientific nature of recreational fishery development.     

A study of disposed fly ash from landfill to replace Portland cement

The landfills of fly ash are the problem of all power plants because this disposed fly ash is not used in any work. This research studies the potential of using disposed fly ashes which have disposal time of 6-24 months from the landfill of Mae Moh power plants in Thailand to replace Portland cement type I. Median particle sizes of disposed fly ashes between 55.4 and 99.3 microm were ground to reduce the sizes to about 7.1-8.4 microm. Both original and ground disposed fly ashes were investigated on physical and chemical properties. Compressive strengths of disposed fly ash mortars were determined when Portland cement type I was replaced by disposed fly ashes at the rate of 10%, 20%, and 30% by weight of cementitious material (Portland cement type I and disposed fly ash). The results presented that most particles of original disposed fly ashes were solid and sphere with some irregular shape while those of ground disposed fly ashes were solid and irregular shape. CaO and LOI contents of disposed fly ashes with different disposal times had high variation. The compressive strengths of original disposed fly ash mortars were low but those of ground disposed fly ash mortars at the age of 7 days were higher than 75% of the standard mortar and increased to be higher than 100% after 60 days. From the results, it could be concluded that ground disposed fly ashes were excellent pozzolanic materials and could be used as a partial replacement of cement in concrete, even though they were exposed to the weather for 24 months.     

常州市备用水源地选址制约因素及对策研究

常州市位于太湖流域腹地,其生产生活用水均取自长江,目前总制水能力基本能满足用水需求,但供水水源单一,存有较大的安全隐患。建设备用水源,提高城市供水系统安全性是目前常州市亟待解决的重要问题。新孟河是连接长江,南北贯穿全市、输送水量较大的清水通道河流。现拟结合新孟河延伸拓浚工程的实施,将新孟河作为城市应急备用水源。本文在调查备用水源地周边环境概况、地表水环境质量现状、底泥质量现状的基础上,分析了该区域作为备用水源地可能存在的制约因素,并提出了相应对策,为常州市备用水源地建设提供了合理化建议。     

环境影响评价工作中存在的问题及对策

对建设项目进行环境影响评价分析,对国民经济的健康稳定发展和保护生态自然环境均有重要的作用,但在具体实施过程中,仍然存在不少问题,如工程分析粗糙、报告书质量不高、评价缺乏针对性和实用性等.本文对此进行了分析,并提出相应对策.     

Effect of current emission abatement strategies on air quality improvement in China: A case study of Baotou, a typical industrial city in Inner Mongolia

The nationalAirPollutionPreventionandControlActionPlanrequiredsignificant decreases inPM2.5 levels overChina.Toexploremoreeffectiveemissionabatement strategies inindustrialcities,acasestudywasconductedinBaotoutoevaluatethecurrent national controlmeasures.ThetotalemissionsofSO2, NOX, PM2.5 and NMVOC (non-methanevolatileorganiccompounds)inBaotouwere211.2Gg,156.1Gg,28.8Gg, and 48.5Gg,respectivelyin2013,andtheywouldexperienceareductionof30.4%,26.6%, 15.1%, and8.7%,respectivelyin2017and39.0%,32.0%,24.4%,and12.9%,respectivelyin 2020. TheSO2, NOX and PM2.5 emissionsfromtheindustrialsectorwouldexperiencea greater decrease,withreductionsof37%,32.7and24.3%,respectively.From2013to2020, the concentrationsofSO2, NO2, andPM2.5 are expectedtodeclinebyapproximately30%, 10% and14.5%,respectively.ThereductionrateofSNA(sulfate,nitrateandammonium) concentrationswassignificantlyhigherthanthatofPM2.5 in 2017,implyingthatthecurrent key strategytowardcontrollingairpollutantsfromtheindustrialsectorismorepowerful for SNA.Althoughairpollutioncontrolmeasuresimplementedintheindustrialsector could greatlyreducetotalemissions,constrainingtheemissionsfromlowersourcessuch as residentialcoalcombustionwouldbemoreeffectiveindecreasingtheconcentrationof PM2.5 from 2017to2020.Theseresultssuggestthatevenforatypicalindustrialcity,the reduction ofPM2.5 concentrationsnotonlyrequiresdecreasesinemissionsfromthe industrial sector,butalsofromthelowemissionsources.Theseasonalvariationinsulfate concentrationalsoshowedthatemissionfromcoal-burningisthekeyfactortocontrol during theheatingseason.     

韩江流域河水地球化学特征与硅酸盐岩风化——风化过程硫酸作用

流域岩石化学风化是全球碳循环的重要环节之一,硅酸盐岩风化过程消耗大气CO_2,是在地质时间尺度上调节大气CO_2浓度的重要机制。本工作在对我国东南花岗岩地区流经典型的硅酸盐岩地质背景河流——韩江流域河流水化学组成研究的基础上,分析和定量计算了河流水体主要物质来源,并对硫酸参与岩石风化和碳循环过程的作用进行了分析,进而对韩江流域岩石风化速率及其大气CO_2消耗通量进行了估算。结果表明,韩江流域河流主离子组成主要来源于硅酸盐岩和碳酸盐岩风化,并计算得出约41%的硫酸根离子来自于大气降水;流域碳酸盐岩的风化速率为21.7 t/(km~2·a),硅酸盐岩为18.9 t/(km~2·a)。硫酸参与岩石风化提供的离子贡献占流域岩石风化提供总离子量的65.9%;流域风化带来的CO_2消耗速率被高估了约61%。     

热联合在塔西南化肥厂节能降耗的应用

通过优化塔西南化肥厂合成氨装置的蒸汽系统和电力工程部的锅炉运行模式,新增外购4.2MPa蒸汽用量,在实现快装锅炉停运的同时送出富余的1.6MPa蒸汽,达到能源梯级循环利用,从而为自身装置和厂际间共同实现节能降耗进行了有益探索,并取得可观的经济效益和社会效益。