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家庭水管不生锈
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作者 周国仁 《企业科技与发展》 1995年第7期30-30,共1页
现代城市居民颇为家中厨房、厕所水管生锈而犯愁。有没有办法使水管保持“永不生锈”的“良好状态”呢?回答是肯定的。
关键词 水泥浆 家庭 水管污染 107建筑胶 425号水泥 处理过的水 城市居民 水泥凝固 现代城市 防锈漆
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防止水管生锈法
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作者 杜林 《农村新技术》 1995年第10期55-55,共1页
关键词 水泥浆 水管污染 107建筑胶 425号水泥 处理过的水 水泥凝固 防锈漆 金属光泽 紧密结合 混合液
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百味书屋
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《江苏统计》 1998年第12期43-44,共2页
宇宙有多大宇宙是无边无际的,它大到人们无法想象的地步。地球对人类来说,可以算是十分巨大了,它的半径是6000多公里,但和太阳相比地球还太小了。太阳的大小是地球的130万倍,不过它只是银河系里一颗极普通的恒星。银河系里... 宇宙有多大宇宙是无边无际的,它大到人们无法想象的地步。地球对人类来说,可以算是十分巨大了,它的半径是6000多公里,但和太阳相比地球还太小了。太阳的大小是地球的130万倍,不过它只是银河系里一颗极普通的恒星。银河系里有1000多亿颗像太阳这样的恒星。... 展开更多
关键词 银河系 观赏植物 总星系 生物大灭绝事件 大乔木 同位素年龄 古生代 马帝国 西双版纳 水管污染
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ECONOMIC APPROACH FOR CONTROL AGRICULTURAL NONPOINT SOURCE POLLUTION IN CHINA 被引量:1
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作者 WANG Xiao-yan CAO Li-ping 《Chinese Geographical Science》 SCIE CSCD 2005年第4期297-302,共6页
This paper mainly discusses the feasibility to establish economic policy systems for control and management of agricultural nonpoint source pollution in China. The current situation of serious agricultural nonpoint so... This paper mainly discusses the feasibility to establish economic policy systems for control and management of agricultural nonpoint source pollution in China. The current situation of serious agricultural nonpoint source pollution in China is described firstly. Based on the environmental policy and economics theories, the system of economic policies for control and management of agricultural nonpoint source pollution is designed in this paper. This system includes the policy objective, the designing principle and the methods. The key issues include pollution charge, inputs tax for restriction, subsides for induction and incentive, effluent trading for least cost reduction. The emphases are optimized on inputs tax and agricultural chemical tax permit under complete information, as well as sub-optimized inputs tax under incomplete information, subsides for farm due to positive and negative externality. The functions and suitability of the policies are also analyzed in the paper. According to the field experiment results and other relating economic data in watershed of the Chaohe River, Beijing, some economic approaches to reducing agricultural nonpoint source pollution are proposed. The main idea is to encourage and support the farmers to improve their farming way, and to implement the policy of castigating charge simultaneously. The feasibility of the policies are analyzed with consideration of economy, technology and institution. It is concluded that the economic policies are necessary and feasible. 展开更多
关键词 agricultural nonpoint source pollution economic approach inputs tax for restriction subsides for induction and incentive Miyun Reservoir
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Mountain Water Tower and Ecological Risk Estimation of the Mesta-Nestos Transboundary River Basin (Bulgaria-Greece) 被引量:2
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作者 K. Grunewald J. Scheithauer +1 位作者 J.-M. Monget N. Nikolova 《Journal of Mountain Science》 SCIE CSCD 2007年第3期209-220,共12页
The Mesta-Nestos river basin in Bulgaria and Greece is a case study for transboundary decision-making support in south-eastern Europe and a show-case for the development of methodologies and information-gathering for ... The Mesta-Nestos river basin in Bulgaria and Greece is a case study for transboundary decision-making support in south-eastern Europe and a show-case for the development of methodologies and information-gathering for the integrated regional planning of water resources. Land-use conflicts in this water-scarce region cover a wide spectrum of activities like agricultural irrigation, drinking water production, diversions for industrial water, and risk of pollution from mining, to name a few examples. Measurements of the water quality were carried out in the upper basin. Results will be illustrated by the example of the environmental situation in the alpine region of the Pirin National Park as well as in the Razlog Basin with a stronger anthropogenic impact and pollution around a former uranium mine near the village of Elesnica. The social and economic development of this transboundary region is a recently established priority for mean an increase in water usage the water resources if regional the future. It will and more stress for impacts of global climate change are verified. Problem-focused management of the catchment area as a whole on the basis of proved geo-data sets is needed for the future. 展开更多
关键词 Environment interactions NUTRIENTS POLLUTANTS resource management Southeast Europe uranium water quality Pirin high Mountains
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Chemical and Organic Contamination of Phreatic Aquifer of Sidi Bouzid (Center West of Tunisia) 被引量:1
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作者 S. Chaibi N. Khlif +1 位作者 M. Chalbaoui W. Aydi 《Journal of Environmental Science and Engineering》 2010年第5期6-13,共8页
An understanding of the long-term changes in the nitrate and microbial contamination pattern of the groundwater of Sidi Bouzid (Centre West of Tunisia) is critical to conservation of drinking water in rural areas su... An understanding of the long-term changes in the nitrate and microbial contamination pattern of the groundwater of Sidi Bouzid (Centre West of Tunisia) is critical to conservation of drinking water in rural areas supporting mixed land-use activities such as cropping, livestock farming, and residence. The phreatic aquifer was revealed polluted by domestic disposals of the wastewaters in the urban zone. The average nitrate concentration in the groundwater of the east of the mioplioquaternary aquifer of Saddaguia (Sidi Bouzid) rose from 50 mg NO3- during 1996 to over 100 mg in 2003, which represents an increase of some 10 mg per year. Nitrate groundwater pollution during the period 1996-2003 was the result of the abusive use of fertilizers.In the cultivated zone, we must reduce the effects of the excessive use of the nitrogen fertilizers on the basis of monitoring soil once a year, managing water resources, rationalizing the use of the chemical substances. In urban zones, most of lost wells located in the perimeter reveal the gravity of the state of the aquifer. This last is organically polluted and requires an immediate action for the generalization of the purification network. We need to take into account the reality of under soil in all future planning's and arrangements. A scheme of sanitation seems necessary before all plans of arrangement. The extension of the sewer network must give the priority to the most vulnerable zones. 展开更多
关键词 AQUIFER WASTEWATER chemical substances microbial contamination Sidi Bouzid (Tunisia).
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Study on the Definition and Allocation of the Rights to Water Utilization in the Ecological Environment 被引量:1
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作者 Xie Yonggang Li Yunling 《Ecological Economy》 2005年第3期25-30,共6页
With the rapid development of population and economy, the conflict between the supply and demand of water resources is becoming outstanding increasingly, In China, many people concern about the problems of ecological ... With the rapid development of population and economy, the conflict between the supply and demand of water resources is becoming outstanding increasingly, In China, many people concern about the problems of ecological environment water expenditure.However, owning to the shortage of water resources and indefinite water rights, “the hustle effect” of per capita water resource is appeared, Moreover. it caused a series of environment problems. This article differentiates and analyzes the relevant concepts about the ecological enviromnent, and puts forward the defined concept of the rights to the ecological environment water utilization. In addition, it points out the characteristic of those rights, and does elementary study on the allocation principle, methods, and steps on the rights. 展开更多
关键词 ecological environment rights ro water utilization definition allocation
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Remediation Effects of Water Management and Lime Application on Seasonally-Fallowed Cd-Contaminated Paddy Fields 被引量:3
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作者 ZHANG Zi-ye XIE Yun-he +3 位作者 HUANG Bo-jun JI Xiong-hui LIU Zhao-bing WEI Wei 《Agricultural Science & Technology》 CAS 2018年第1期33-40,共8页
In the light of the national policy of fallow, this study was conducted to determine how the different water management and lime application would affect soil physical and chemical properties, rice yield and cadmium ... In the light of the national policy of fallow, this study was conducted to determine how the different water management and lime application would affect soil physical and chemical properties, rice yield and cadmium (Cd) content of rice in fallow season. The results showed that, compared with the arid fallow, the waterlogging fallow decreased the soil pH value whereas signifcantly increased the soil organic matter content and the cation exchange quantity, and reduced the soil effective cadmium content and the rice cadmium content whereas could increase the rice yield to a certain extent. In the fooded fallow or the dry fallow, the application of lime mainly depended on the alkali conditioning of lime and the antagonistic effect of Ca2+, which could signifcantly reduce the cadmium content of rice, and its effect would increase linearly with the increase of lime dosage, whereas had no significant effect on soil organic matter content and cation exchange quantity. In order to establish a linear equation of lime dosage and related indexes under the condition of waterlogging fallow or dry fallow, calculations showed that each application of lime at 1 000 kg/hm2 or kg/hmss2 could improve soil pH value by 0.238 2 or 0.246 5units respectively, and reduce the effective Cd content to 0.007 5 mg/kg both in the arid fallow and the waterlogging fallow conditions. The lime theoretic application rate for the lowest Cd content of late rice in the arid fallow was 5 120 kg/hm2, and the minimum limit of the Cd content in rice was 0.124 2 mg/kg; and the lime theoretic application rate for the highest yield of late rice in the submerged water fallow was 4 636 kg/hm2, the minimum theoretic Cd content in rice is 0.100 7 mg/kg, and it could reduce the Cd content in rice under the condition of submerged fallow and decrease the dosage of lime. 展开更多
关键词 RICE Water management Lime application Seasonal fallow Cadmium pollution Heavy metal
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Identification of contamination source in water distribution network based on consumer complaints 被引量:3
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作者 陶涛 黄海东 +1 位作者 信昆仑 刘书明 《Journal of Central South University》 SCIE EI CAS 2012年第6期1600-1609,共10页
A new methodology was proposed for contamination source identification using information provided by consumer complaints from a probabilistic view.Due to the high uncertainties of information derived from users,the ob... A new methodology was proposed for contamination source identification using information provided by consumer complaints from a probabilistic view.Due to the high uncertainties of information derived from users,the objective of the proposed methodology doesn't aim to capture a unique solution,but to minimize the number of possible contamination sources.In the proposed methodology,all the possible pollution nodes are identified through the CSA methodology firstly.And then based on the principle of total probability formula,the probability of each possible contamination node is obtained through a series of calculation.According to magnitude of the probability,the number of possible pollution nodes is minimized.The effectiveness and feasibility of the methodology is demonstrated through an application to a real case of ZJ City.Four scenarios were designed to investigate the influence of different uncertainties on the results in this case.The results show that pollutant concentration,injection duration,the number of consumer complaints nodes used for calculation and the prior probability with which consumers would complaint have no particular effect on the identification of contamination source.Three nodes were selected as the most possible pollution sources in water pipe network of ZJ City which includes more than 3 000 nodes.The results show the potential of the proposed method to identify contamination source through consumer complaints. 展开更多
关键词 water distribution network contamination source IDENTIFICATION consumer complaints
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Adsorption characteristics of construction waste for heavy metals from urban stormwater runoff 被引量:2
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作者 王建龙 张萍萍 +1 位作者 杨丽琼 黄涛 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第9期1542-1550,共9页
Stormwater runoff has become an important source of surface water pollution. Bioretention, a low impact development measure in urban stormwater management, has been proven to be effective in the removal of pollutants ... Stormwater runoff has become an important source of surface water pollution. Bioretention, a low impact development measure in urban stormwater management, has been proven to be effective in the removal of pollutants from stormwater runoff, with appropriate bioretention media. In this study, construction wastes were selected as bioretention media to remove heavy metals from stormwater runoff. Static and dynamic adsorption batch experiments were carried out to investigate the adsorption of heavy metals in simulated stormwater runoff system with construction wastes in different particle sizes. The experimental results show that the pseudo-secondorder kinetic model characterizes the adsorption process and the adsorption equilibrium data are well described by Freundlich isotherm model. The construction wastes used can remove heavy metals from stormwater runoff effectively, with their average removal rates all more than 90%. The particle size of construction wastes greatly influences the equilibrium time, rate and adsorption capacity for heavy metals. 展开更多
关键词 Stormwater runoff Heavy metal Adsorption Construction waste
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A Municipal Management Plan for Urban Groundwater Investigation and Remediation
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作者 Sandra Vasin Wolfgang Ufrecht +4 位作者 Stefan Spitzberg Ulrich Lang Wolfgang Schaeifer Uli Schollenberger Hermann Josef Kirchholtes 《Journal of Earth Science and Engineering》 2013年第5期283-291,共9页
The project MAGPIan, funded by the European Commission under the program LIFE+2008, aims to develop and implement an optimal strategy for integral groundwater investigation and efficient remediation of key sources of... The project MAGPIan, funded by the European Commission under the program LIFE+2008, aims to develop and implement an optimal strategy for integral groundwater investigation and efficient remediation of key sources of pollution for the whole inner city area. The first investigations included descriptions of the complex hydro-geological system of the eight aquifers, drilling of monitoring wells and set up of the conceptual contaminant model. A conceptual contaminant model was developed to describe the status quo of the present contaminant distribution, as well as the basic processes controlling contaminant migration within the observed aquifers. This included the characterization of redox conditions and natural chlorinated hydrocarbons degradation processes, as well as age dating, forensic interpretations with respect to the contaminant origin, and determination of radioactive and stable isotopes. Further on, a numerical unsteady groundwater flow and contaminant transport model were developed, which enabled a quantitative description of the mass balance within the project area. The unsteady numerical model provided detection of migration paths in the valley of Stuttgart and identification of key sources of pollution. 展开更多
关键词 Chlorinated hydrocarbons hydro-geology natural degradation forensic methods conceptual model 3D numericalcontaminant transport model.
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Gross Pollutants Study in Urban Areas under Tropical Climates
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作者 Lariyah Mohd Sidek Hidayah Basri +3 位作者 Mohamed Roseli Zainal Abidin Lira Chow Hock Md Nasir Md Nor Nor Azazi Zakaria 《Journal of Civil Engineering and Architecture》 2014年第1期107-114,共8页
Gross pollutants are the primary targeted pollutants in urban catchment management for urban water quality improvement as well as mitigation of flood. Apart from aesthetically unattractive because of its visibility, g... Gross pollutants are the primary targeted pollutants in urban catchment management for urban water quality improvement as well as mitigation of flood. Apart from aesthetically unattractive because of its visibility, gross pollutants also contributes to degradation of river water quality and loss of aquatic habitat as it carries harmful pollutants such as oxygen demanding material, hydrocarbons and heavy metals. This study analyzed trend of gross pollutant generated from two urban residential areas located in Selangor, Malaysia. The median value of gross pollutant load obtained fi'om the Amanah Apartment and Bandar Botanic are 347.41 kg/ha/year and 32.46 kg/ha/year, respectively. Relationship between gross pollutant wet load with rainfall depths was derived using regression equation. A significant trend of increasing gross pollutant wet load into drainage system with increasing rainfall depth was observed. The behavior of pollutant load is related to the one observed in Australia. 展开更多
关键词 Gross pollutant load urban stormwater quality urban stormwater management.
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