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简化河流水质1号模型(RWQM1)实验研究 总被引:1,自引:0,他引:1
为了建立标准、一致的河流水质模型,并使它们可与标准活性污泥模型直接相连,国际水协会(IWA)专门成立了河流水质建模任务组,并发布河流水质1号模型(RWQM1)。根据河流水质1号模型(RWQM1)子模型选择原则,通过试验研究,得出以下两点结论:(1)简化河流水质1号模型能充分考虑废水生物处理自身的特点,较为深入地反映活性污泥生物反应过程的主要行为;(2)通过参数灵敏度分析,发现对模拟COD值影响较大的动力学参数是kgro,H,aer,To和khyd,To,对模拟TP值影响较大的动力学参数是kgro,H,aer,To、kgro,N1,To和βN1,对模拟NH3-N值影响较大的动力学参数是kgro,N1,To和βN1。 相似文献
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随着新能源汽车工业的快速发展,废旧三元动力锂电池的量在不断地增加。三元动力锂电池中含有丰富的Co、Mn、Li和Ni资源,回收三元动力锂电池是防止环境污染和回收贵重金属的理想选择。利用抗坏血酸(C6H8O6)的酸性和还原性对废旧三元锂电池正极材料进行浸出,KMnO_4的强氧化性回收浸出液中的Co制备β-CoC_2O_4·2H_2O,采用浓度为1.3 mol·L~(-1)的C_6H_8O_6,在60℃的条件下对正极材料浸出20 min,向浸出夜中加入1 mol·L-1的H_2SO_4反应20 min后加入KMnO_4继续反应1 h,制得β-CoC_2O_4·2H_2O。实验结果表明,Co的回收率达91%,Li的浸出率可达96.4%,Mn和Ni完全浸出,可实现简单环保地浸出有价金属并回收Co。 相似文献
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本文主要描述研究大气污染的HF-1风洞的设计特点和测试技术.其次,本文还扼要地论述了在风洞中研究大气污染模拟大气边界层的基本要求。 相似文献
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Li Qian Tang Zeqin Zhang Jiahui Hu Jingtao Chen Jianmeng Chen Dongzhi 《Environmental science and pollution research international》2022,29(32):48638-48647
Environmental Science and Pollution Research - Simultaneous biodegradation of malodorous 1-propanethiol (PT) and dimethyl sulfide (DMS) by Pseudomonas putida S-1 and Alcaligenes sp. SY1 was... 相似文献
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Endosulfan in China 1—gridded usage inventories 总被引:9,自引:0,他引:9
Jia H Li YF Wang D Cai D Yang M Ma J Hu J 《Environmental science and pollution research international》2009,16(3):295-301
Background, aim, and scope Endosulfan, an organochlorine pesticide (OCP), is genotoxic in mammalian cells and generally considered to be toxic and classified
by the World Health Organization and the US Environmental Protection Agency as priority pollutants and a nominator for inclusion
in a future iteration of the persistent organic pollutants treaty. Endosulfan is a currently used pesticide and still being
used worldwide. The general trend of total global endosulfan use has increased continuously since the first year when this
pesticide was applied. It is critical to create national endosulfan usage/emission inventories for China to carry out source–receptor
relation analysis, risk assessment, and other research related to endosulfan in this country. Chinese inventories have been
published for some OCPs, such as technical HCH and lindane, DDT, and chlordane; for endosulfan, however, there has not been
any usage inventory available on any scales (national or provincial), although endosulfan has been widely used since 1994
in this country. This is the first part of the work. The goal of this paper is to quantify the historical production and usage
of endosulfan in China and to compile gridded historical usage inventories of endosulfan for this country. Based on these
usage inventories, emission and residue inventories will be created, which is the goal of the second part of the work.
Materials and methods Due to the lack of national production and usage information of endosulfan in China, a method to estimate the use of endosulfan
was developed. First, information of crops on which endosulfan is applied and average endosulfan use and annual application
frequencies of endosulfan on these crops were collected. Secondly, usage of endosulfan on each crop was estimated using the
national cropland area for each province from Chinese government reports. Finally, with the help of GIS (geographic information
system), the usage data of this insecticide was allocated to a grid system, with a 1/4° longitude by 1/6° latitude resolution,
with a size for each grid cell of approximately 25 km by 25 km.
Results and discussion The use of endosulfan in agriculture in China started on cotton in 1994, and on wheat, tea, tobacco, apples, and other fruits
in 1998. Endosulfan usage on cotton, wheat, tea, tobacco, and apples in China has been estimated to be approximately 25,700 t
between 1994 and 2004. The province with the highest usage of endosulfan is Henan Province, with a total usage reaching 4,000 t,
followed by the uses in Xinjiang Autonomous Region (3,200 t), Shandong Province (3,000 t), Hebei Province (2,100 t), and Anhui
Province (1,900 t). Gridded usage inventories of endosulfan at a 1/4° longitude by 1/6° latitude resolution have been created,
which indicate that the intensive endosulfan use was in the south of Hebei Province, west of Shandong Province, east of Henan
Province, north of Anhui Province, east of Jiangsu Province, and some areas in Yunnan Province and Xinjiang Autonomous Region.
General agreement has been found between the usage data from our estimation and the small amount of usage data published in
China.
Conclusions This is the first national gridded endosulfan usage inventory produced for China. The annual applications of endosulfan from
1994 to 2004 in China were estimated based on the total areas of major crops, on which endosulfan was applied, and spatial
distribution of the application was generated at provincial and prefecture levels. With the help of GIS, endosulfan usage
based on prefecture was transferred to a 1/4° longitude by 1/6° latitude gridding system. The satisfaction of the inventories
was supported by the consistence between the estimation of the annual usage and the reported annual production of endosulfan.
Recommendations and perspectives This gridded endosulfan usage inventory created in this study will be improved upon availability of new information of endosulfan.
The usage inventories can be used to create gridded emission and residue inventories for this insecticide. It is believed
that this work will pave the way for further endosulfan studies in China and beyond. 相似文献
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ZYC—1型自动雨水降尘采样器主要具自下列二种功能;1、下雨时自动开门,按下雨的先后依次收集雨水样品;2、不下雨时收集少量降尘。 一、采样器的结构和功能 1、结构 本采样器由雨水敏感器、雨水收集器、降尘收集器、雨水收集样品瓶(50ml×5) (150ml×2)、活动门、电路控制部分、直流可逆电机和机械传动部分组成,外形尺寸630×430×272mm,重量10公斤。 相似文献
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目前BOD的测定方法大都采用20℃、5天培养,其缺点是时间太长。因为生化需氧反应。在各阶段的发生及反应速度与有机物的种类、浓度、无机盐类、水温、pH值、微生物的品种数量等因素有关。本文采用提高温度缩短时间的方法,做了一些探讨性的实验和运算,找到了BOD_5~(20)与BOD_1~(37)的内在联系,达到了快速测定BOD的目的。 相似文献
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利用二阶铁离子絮凝作用及其与二价硫离子在一定的条件下形成沉淀,以及铁屑固定床微电解作用,处理1-氨基蒽醌生产废水,具有处理工艺简便、“以废治废”的特点,为染料工业废水的治理提供了一条新途径。 相似文献
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为实现对柴油机碳烟和NOx的低温同步去除,采用柠檬酸络合法制备分子筛负载钙钛矿型金属复合氧化物催化剂,应用x衍射分析仪(XRD)和电镜扫描仪(SEM)对催化剂性能进行表征,并在微型固定床反应器中对催化剂低温去除碳烟和NOx进行活性评价。利用程序升温反应(TPR)技术,进行催化剂活性评价、柴油机负荷和排放等特性实验。结果表明,A位用适量Ce部分取代La,B位用适量cu部分取代Mn,可使碳颗粒燃烧温度降低,CO2选择性好,NOx转化率升高。La0.4 Ce0.6 Cu0.2 Mn0.8O3/HZSM-5催化剂的最大NOx转化率为81.0%,Ti、Tm和Tf分别为250、350和475℃,表明该催化剂具有较好的催化活性,能在低温条件下去除碳烟和NOx。 相似文献
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电除尘器以其效率高,正在越来越广泛地应用于冶金、建材、电力、化工、轻纺、电子、医药等工业部门.电除尘器的低压控制电源与电除尘器的本体、高压直流电流电源统称电除尘器的三大主体.低压操作系统控制特性的好坏和控制功能的完善与否,对实现电除尘操作运行自动化,改善除尘器的运行状况、提高除尘效率、延长除尘器各部分构件的使用寿命等都有直接的影响. 近年来,我国陆续从国外引进一些比较先进的电除尘器,都配有成套的低压控制电 相似文献
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浙江省环境监测中心站和浙江光学仪器厂共同研制的SYG-1型智能冷原子荧光测汞仪,已于1991年12月16日在杭州通过省级鉴定。与会专家认为该仪器设计合理、技术先进,在国内同类产品中,第一家采用微机技 相似文献
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Nowrotek Monika Kotlarska Ewa Łuczkiewicz Aneta Felis Ewa Sochacki Adam Miksch Korneliusz 《Environmental science and pollution research international》2017,24(17):15055-15066
Environmental Science and Pollution Research - The aim of this study was to analyze the occurrence of sulfonamide resistance genes (sul1–3) and other genetic elements as antiseptic resistance... 相似文献