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black odor river

Xiyan Ji, Weizhen Zhang, Mengqi Jiang, Jian He, Zheng Zheng
The black-odor mechanism of Yitong River was analyzed based on survey and monitoring results. We found that organic matter is the main pollution source of Yitong River and its tributaries. A black-odor evaluation model that can describe the pollution of the Yitong River water system was developed, and this model has the parameters I = 0.21 [CODCr ] + 0.18 [DO] - 0.36[NH3 -N] + 0.91. The model performance was satisfactory with a black-odor defining accuracy of 69%. Moreover, we found that CODCr , NH3 -N, and DO are the influential factors of the Yitong River black-odor water body and that their threshold values when the water body transitioned to black odor were 109...
October 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Chen Song, Xiaoling Liu, Yonghui Song, Ruixia Liu, Hongjie Gao, Lu Han, Jianfeng Peng
Elimination of black-stinking water contamination has been listed as an urgent task in the Water pollution prevention action plan promulgated by State Council of China. However, the key blackening and stinking pollutants and their sources are still unclear. In this study, water quality of a black-stinking urban river in Beijing, Dongsha River, was evaluated firstly; then the distribution of the blackening and stinking pollutants was investigated, and the key pollutants and their potential sources were identified; and finally, the health risk of those pollutants was assessed...
September 15, 2017: Journal of Environmental Management
Mei Pan, Jun Zhao, Shucong Zhen, Sheng Heng, Jie Wu
Excess nitrogen in urban river networks leading to eutrophication has become one of the most urgent environmental problems. Combinations of different aeration and biofilm techniques was designed to remove nitrogen from rivers. In laboratory water tank simulation experiments, we assessed the removal efficiency of nitrogen in both the overlying water and sediments by using the combination of the aeration and biofilm techniques, and then analyzed the transformation of nitrogen during the experiments. Aeration (especially sediment aeration) combined with the biofilms techniques was proved efficient in removing nitrogen from polluted rivers...
2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Ryan M Young, Nathan D Burkett-Cadena, Tommy W McGaha, Mario A Rodriguez-Perez, Laurent D Toé, Monsuru A Adeleke, Moussa Sanfo, Traore Soungalo, Charles R Katholi, Raymond Noblet, Henry Fadamiro, Jose L Torres-Estrada, Mario C Salinas-Carmona, Bill Baker, Thomas R Unnasch, Eddie W Cupp
BACKGROUND: Entomological indicators are considered key metrics to document the interruption of transmission of Onchocerca volvulus, the etiological agent of human onchocerciasis. Human landing collection is the standard employed for collection of the vectors for this parasite. Recent studies reported the development of traps that have the potential for replacing humans for surveillance of O. volvulus in the vector population. However, the key chemical components of human odor that are attractive to vector black flies have not been identified...
January 2015: PLoS Neglected Tropical Diseases
He DeFu, Chen RuiRui, Zhu EnHui, Chen Na, Yang Bo, Shi HuaHong, Huang MinSheng
Following urbanization, a large number of urban rivers were contaminated and turned to black-odor rivers. The traditional approach for detecting water quality is based on chemical or physical analysis. However, biological toxicity of black-odor water has been less addressed. As two typical black-odor rivers, Jiushanwai River (JS) and Shanxia River (SX) are tributaries of Wen-Rui Tang River in Wenzhou (south of China). The eco-safety of the urban rivers was evaluated by bioassay for water toxicity in this study...
February 2015: Environmental Science and Pollution Research International
A Engelhart, D Müller-Schwarze
Free-ranging beaver (Castor canadensis) in two different beaver populations in New York State were exposed to predator chemicals to test feeding inhibition. Solvent extracts of feces were applied to stem sections of aspen, the preferred food tree of beavers, permitting smelling and tasting the samples. Predator odors were from wolf (Canis lupus), coyote (Canis latrans), dog (Canis familiaris), black bear (Ursus americanus), river otter (Lutra canadensis), lynx (Lynx canadensis), and African lion (Panthera leo)...
September 1995: Journal of Chemical Ecology
Kuan Xu, Bo Liu, Guo-Xiang Wang, Jiu-Yuan Ma, Xun Cao, Feng Zhou
Using Indoor simulation method, the effect of Vallisneria spiralis on the physicochemical propertise of black and stink sediment was investigated. The surface sediment of urban sluggish river which had been heavily polluted was used as material in the study. The results showed that the redox environment of the sediment was significantly improved by Vallisneria spiralis. During the experiment, the Eh of surface sediment rose from -70 mV to 90 mV. The ferrous content was reduced by 25% in the experiment group while increased by 38% in the control group; the organic matter was decomposed effectively, prevented from natural decomposition to the smelly substances...
July 2013: Huan Jing Ke Xue= Huanjing Kexue
Z Xu, Z Liao
Suzhou Creek is a seriously polluted tidal river in Shanghai, China. With the development of Shanghai, there is more and more concern over the "blackness and stink" phenomenon of Suzhou Creek. Suzhou Creek Rehabilitation Project was launched in 1998, and the planning investment of the Project Stage I was 8.65 billion yuan (about 1.05 billion US dollars). It is important to predict the effectiveness of the project and to optimize it. In this study, the USEPA's WASP model is employed to establish a water quality model of Suzhou Creek by using data from the Third Trial Low Flow Augmentation on Suzhou Creek in 1999 and other monitoring results...
2005: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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