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<?Pub Dtl?>Using the shortwave infrared (SWIR) atmospheric correction algorithm with 1640 and 2130 nm bands, water optical property data for China's inland freshwater Lake Taihu have been derived from measurements of the Moderate Resolution Imaging Spectroradiometer (MODIS) on the satellite Aqua. Using MODIS-Aqua measurements from 2002 to 2010, seasonal and spatial distributions of the normalized...
Understanding the spatial-temporal distributions and variations of water quality index are important for pollution sources identification and are essential for efficient water environment management. Reasonable designed monitoring networks of rivers and the periodical monitoring campaign can provide the water quality data to describe the spatial-temporal vision of the river water quality state. Multiple...
Due to the severe pollution taken place in Taihu Lake, the investigation of water source quality in Taihu Lake is urgent for the development of drinking water treatment processes. Water samples taken from two water source areas in Taihu Lake were analyzed. The results showed that ammonia, TN, TP and CODMn were the dominant contaminants. The concentrations of those contaminants all exceeded “surface...
Identification and analysis of contaminants arising from occasional release or intentional discharge in unsecured water supplies are fundamental to public welfare. This calls for national and international capacities to respond, sense, detect, isolate, and mitigate threats to water quality. Using advanced nanomaterials as enabling technologies, a series of novel point and stand-off sensors and detectors...
The paper took the reclaimed water plant in one economic zone of Tianjin for an example, and set up six source water quality indexes, pH, SS, CODCr, TN, NH3-N and TP, on the basis of analysis on primary pollutions' variation regularity of the source and the treatment process's characteristic of the reclaimed water plant, and built source water quality forecast system on grey system theory. The study...
As scientific references of evaluation on the groundwater contamination, natural background levels about chemical indexes TFe and Mn of shallow groundwater in Pearl River Delta was derived with SPSS statistical software, and its spatial distribution regularities and the controlling factor were discussed. The results show that the regularity in Pearl River Delta is primarily controlled by topography,...
Payment for watersheds services (PWS) is an important instrument of watersheds protection and management, which can transform fortune and reduce the inequity of environment and development between the upper reach and lower reach. Both government and market play a key role in the course. Based on case study of Jinhua River, the analysis on the payment mechanism and modes of environmental services and...
Water quality monitoring is a very important undertaking that would ensure safe and clean water being delivered to the end users. Water quality monitoring is essential in controlling physical, chemical and biological characteristics of water. To ensure a complete and an all inclusive monitoring of the underground water and surface water, data sampling need to be carried out at many different locations...
The watershed Landscape characteristics are important variables that influence surface water quality. Freshwater research and management efforts could be greatly enhanced by a better understanding the relationship between these variables and surface water quality. The major focus of this paper involved modeling relationships between watershed characteristics variables and water quality indicators...
Ultrafiltration technology hold great promise to provide better water quality, especially for stringent requirements and thus the basic characteristics of ultrafiltration membrane was introduced and its advantages and disadvantages were discussed in this paper. Ultrafiltration membrane fouling mechanism, the factors affecting membrane fouling, and membrane pollution control measures were summed up...
Baiyangdian is the largest wetland in north China, and plays an important role in many aspects such as climate regulation, biodiversity protection, flood control, and local fishery production etc. the research of this paper include the following four aspects: 1) The composition, current situation, and changing tendency of sub-systems that constructed the whole system. 2) Building up the system model...
In this study, the water standard is interval rather than point, so a new analysis method which proposed from the grey system theory - Grey Relational Analysis (GRA) based on the distance of a point to the interval, is used for assessment of drinking water quality in Jiaozuo city China; This method is simple and has good operability, and the physics significance was clear. Good results are achieved...
A water balance model is established in this paper. The relationship between water requirement and lake ecosystem is built and reflected by the appropriate water level to protect lakes and wetlands. And some measures of controlling human management action with water limit are put forward by the example of the Baiyangdian Lake.
Baiyangdian wetland is the largest freshwater lake in the north of China with an area of 366 Km2. Recent years, the water quality of this area is degenerating. According to the field data in October 2006, the water quality belongs to organic pollution type. In September 2008, 67 water quality samples in Baiyangdian wetland were collected, with the parameters including pH, chlorophyll-a, dissolved...
A vulnerability assessment model for regional water distribution system (VAMRWDS) is presented. The model takes into account the impact of residual chlorine and water age, as well as the uncertainty and probabilistic characteristic of the distribution systems. Monte-Carlo stochastic simulation is adopted in the model to randomly generate bulk and wall reaction coefficients. Employing the EPANET toolkit...
Chironomus kiiensis larvae which cannot be exterminated by conventional disinfection process propagates prolifically in eutrophic water body, and it therefore turns to be a potential problem encountered in drinking water quality. In this paper, the quantitative experimental studies were carried out on inactivation of the fourth instar larvae of Chironomus kiiensis in the raw water using oxidants,...
Chironomus kiiensis larvae which cannot be exterminated by conventional disinfection process propagates prolifically in eutrophic water body, and it therefore turns to be a potential problem encountered in drinking water quality. In this paper, comparative experiments on the inactivation of the fourth instar larvae of Chironomus kiiensis in distilled water by chlorine, ozone and chlorine were conducted...
The variation of Assimilable Organic Carbon (AOC) during the coagulation of raw surface water and synthetic water by Al2(SO4)3 was investigated. It was found that the removal rate of AOC concentration during alum coagulation of raw surface water was about 49.5% at high coagulant dosages. The AOC of water decreased efficiently during coagulation in the case of synthetic water at lower coagulant dosages,...
The prevalent water problems like quantity shortage, environment pollution and ecological damage restrict urban sustainable development. Unreasonable water utilizing causes conflicts between artificial water cycling system and natural cycling water system, which turns out to be the source of urban water problems. To find ultimate solutions to the water problems and the way of sustainable water utilization,...
In this paper, a new method for analyzing and predicting the pollution characteristics of Tianjin coastal water quality was proposed through the study on the fractional theory, and this method was based on environmental monitoring data completely. Firstly, the COD values of recent years from the 9 monitoring points were gathered and normalized, and the 9 monitoring points are distributed on the Tianjin...
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