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Discharge of organic waste results in high nutrient pollution of the water bodies which is a major menace to the environment. A high quantity of nutrients such as ammonia causes a reduction in the dissolved oxygen level and induces algal growth in the water bodies. Water quality models have been the tools to evaluate the rate at which streams can disperse the pollutants they receive. Many water quality...
Algae bloom is an important manifestation of water pollution in lakes and rivers, its status evaluation is the premise of algae bloom treatment. Based on remote sensing image and multi-site water quality monitoring information, this paper introduces sensor priority and evidence credibility to realize the discount processing of evidence. And then, the evaluation model of algae bloom in lake and reservoir...
We performed mathematical modeling population dynamics of phytoplankton in aquatic ecosystems based on interspecific interactions and nutrient pollution and toxic substances. We proposed a method of measuring control multispectral television ecological status of water bodies on the parameters of phytoplankton.
The paper covers problems of solving tasks of water ecology on multiprocessor computer system (MCS). We proposed a new model of biological rehabilitation of shallow waters in view the factors that have a significant influence on the water quality. Its discretization was performed with using the balance method and the implicit scheme with central differences. The proposed numerical method for the solution...
In this paper, we present a new dielectrophoretic microfluidic technique in a modular Lab-on-Chip (LoC) platform. The proposed LoC has a reconfigurable topology. It generates a wide range of signals depending on the analyzed liquid with a variable frequency up to 1.2 MHz. In addition, a programmable phase shift circuit with a minimum phase step of 3.6° for each signal is implemented. The amplitude...
To improve the water quality of Wangyu River, which is the important diversion channel for Water Transfer from Yangtze River to Lake Taihu, a ecological spur-dike was constructed in Wangyu River, This project combined the traditional water conservancy engineering with the biofilm technology, which can not only slow velocity and settle down sediment but also degrade organic pollutants and absorption...
Based on analysis of the process and reasons for blue-green algae outbreak in Taihu Lake in 2007, from five areas, such as the quality of life for residents, the residents physical and mental health, employment, environmental awareness and government's public service, to defined the social impact of the blue-green algae event in Taihu Lake, and then explore the necessity and feasibility of studying...
The actual environment of ballast water is simulated through the cultivation of chlorella. The filtration and absorption of the algae in the simulation of ballast water is taken by the ceramic filter, then kill the remaining algae with the UV radiation. The samples are taken respectively before and after filtration and UV radiation equipments, and the algae removal rate is analyzed by counting on...
In the paper the repairing and treatment technology of polluted river was summarized, which were chemical, physical and bioremediation technologies. Chemical techniques include chemical alga-killing, heavy-metal fixer. Physical techniques include artificial aeration, polluted watercourse flushing, sediment dredging. Bioremediation techniques include microorganism strengthen, plant strengthening, bio-film...
Water and sediment samples, collected from Meiliang Bay in Taihu Lake, were employed to investigate the dynamic of phosphorus in water-sediment interface during the courses of proliferating, blooming and decaying of C. Reinhardtii under simulated conditions. Particulate phosphorus released from the decayed algae and sediment increased the availability of phosphorus to algae during the incubation....
A new kind of floating bed named Integrated Ecological Floating Bed (IEFB) was constructed and optimized employing Oenanthe javanica, Hyriopsis cumingii Lea and artificial media. This paper studied the effect of IEFB on eutrophic water quality improvement with results showing that the average removal rates of TN, TP, NH4+-N, CODMn and Chl-a by IEFB were up to 42.6%, 56.6%, 77.7%, 13.5% and 62.2%,...
The biosorption and biodegradation of tributyltin (TBT) at sublethal concentration of the two microalgae Leptocylindrus danicus and Amphidinium carterae were investigated. The results showed that accumulation of TBT occurred in the two algae, the adsorption of TBT by the algal cell wall was a rapid process. The degraded products, dibutyltin (DBT) and monobutyltin (MBT), were not detected in the incubation...
This paper reports before and after the low frequency low power ultrasound were treated with different concentrations of algae in Taihu Lake sample water quality changes, and we have found that low frequency and low power ultrasonic can not only safe and efficient removal of algae in Taihu Lake, and the treated water quality improved significantly. After two times of ultrasonic treatment and for 24...
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...
In this study, a new composite coagulant, which was prepared by ployferric chloride (PFC) and polydimethyldiallylammonium chloride (PDMDAAC), was adopted to treat surface water. The effect of coagulant dosage and pH of dye water on the removal efficiency was examined. The results showed that PFC-PDMDAAC is shown to be more effective in removal efficiency than that of PFC and PDMDAAC. And the removal...
The aim of this experiment was to evaluate the effect of the floating bed technology which used Canna general is, Acorus calamus and the two plants mixed together with the technology of soil less culture for scenic water treatment. The results showed that all the plants grew well and nitrogen, phosphorous and organic pollutants were removed effectively after 60 days. The highest removal rate of TP,...
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