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Search Results: 1 - 10 of 304813 matches for " land application<br>污水 "
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Characteristics of sewage sludge and distribution of heavy metal in plants with amendment of sewage sludge
DAI Jia-yin,CHEN Ling,ZHAO Jian-fu,MA Na,
DAI Jia-yin
,CHEN Ling,ZHAO Jian-fu,MA Na

环境科学学报(英文版) , 2006,
Abstract: In order to better understand land application of sewage sludge, the characterization of heavy metals and organic pollutants were investigated in three different sewage sludges in Shanghai City, China. It was found that the total concentrations of Cd in all of sewage sludge and total concentrations of Zn in Jinshan sewage sludge, as well as those of Zn, Cu, and Ni in Taopu sludge are higher than Chinese regulation limit of pollutants for sludge to be used in agriculture. Leachability of Hg in all of studied samples and that of Cd in Taopu sewage sludge exceed the limit values of waste solid extraction standard in China legislation. Based on the characteristics for three kinds of sewage sludge, a pot experiment was conducted to investigate the effect of soil amended with Quyang sewage sludge on the accumulation of heavy metal by Begonia semperflorens-hybr; Ophiopogon japonicus (L.F.) Ker-Gaw; Loropetalum chindense-var. rubrum; Dendranthema morifolium; Viola tricolor; Antirrhinum majus; Buxus radicans Sieb; Viburnum macrocephalum; Osmanthus fragrans Lour; Cinnamomum camphora siebold and Ligustrum lucidum ait. Results showed that 8 species of plant survived in the amended soil, and moreover they flourished as well as those cultivated in the control soil. The heavy metal concentration in plants varied with species, As, Pb, Cd and Cr concentration being the highest in the four herbaceous species studied, particularly in the roots of D. morifolium. These plants, however, did not show accumulator of As, Pb, Cd and Cr. The highest concentration of Ni and Hg was found in the roots of D. morifolium, followed by the leaves of B. semperflorens-hybr. Levels of Zn and Cu were much higher in D. morifolium than in the other plant species. D. morifolium accumulated Ni, Hg, Cu and Zn, which may contribute to the decrease of heavy metal contents in the amended soil. Treatment with sewage sludge did not significantly affect the uptake of heavy metals by the L. chindense-var. rubrum, however, it significantly affected the uptake of heavy metals by D. morifolium.
Heavy metal concentrations and their decreasing trends in sewage sludges of China

CHEN Tongbin,HUANG Qifei,GAO Ding,ZHENG Yuqi,WU Jifu,

环境科学学报 , 2003,
Abstract: Analysing the reported data about heavy metals in sewage sludges between 1994-2001 in 60 cities of China, it is concluded that Zn, Cu and Cr concentrations of heavy metals in sewage sludges of China was velativel high while the concentrations of the high toxic metals, Hg, Cd, As, were lower than 20 mg/kg.The concentrations of neavy metals in 70% of statistical samples were found to be lower than 20 mg/kg for As, 2.8 mg/kg for Cd, 250 mg/kg for Cr, 417 mg/kg for Cu, 5 mg/kg for Hg, 75 mg/kg for Ni, 130 mg/kg for Pb and 1701 mg/kg for Zn, respectively. There were about 11% of Ni, 30% of Cu, and 45% of Zn in all the statistical samples which had overran the heavy metal limits of sewage sludge for land application in China. This suggests that Zn was the most primary heavy metal pollutant in sewage sludge in China. The overrunning percent of Zn would be 9% according to the new limits set by China National Standard of Pollutant Release from Sewage Treatment Plant. Because all the heavy metal concentrations in China's sewage sludges were lower than the limits of US EPA, heavy metal pollution in China causing from land application of sewage sludges may not be a serious problem. It is also proved that the heavy metal concentrations in sewage sludge have being decreased over time both in developed countries and in China in the last two decades. The average of heavy metal concentrations has being decreased by 2.7%-4.9% in Beijing City and 0.1%-2.4% in Tianjing City. The heavy metal limits of China are too low that most of sewage sludges (ca. 55% of the total) can not be used for land application. In fact, about 51.5% of China's crop soils were reported to have Zn deficiency. It is suggested that he heavy metal limits in sewage sludge for land application should be modified to promote the safety reuse of sewage sludges in China.
Study on the wastewater purification system of varied organisms

XIA Xue-Fen,DONG Fa-Kai,

中国生态农业学报 , 2001,
Abstract: There are still some defects in the traditional wastewater biological disposal technology,when it has gone through 100 years' application. These defects are greater investment, much power and inconvenient management. In the wastewater purification system of varied organisms, wastewater is purified according to the metabolism of the food chain step by step. The system is composed of three disposal units of microbes, plants and aquatic animals. The organic matters in wastewater are digested and resolved into CO2,H2O,NH4+,CH4,PO43-,etc. by anaerobe in the first unit. When wastewater passes through the second unit, everyone of them except CH4 is absorbed by algae or plants and transformed into cells of plants by photosynthesis. In the third unit,the excessive microbes and algae are eaten by planktons or fish and transformed into animal albumen. Finally wastewater is purified, its effect can arrive at the level of third grade disposal. The wastewater purification technique of varied organisms is an ecological safe disposal technique to environment. It will be a new technique of 21st century. It has a good application foreground, especially is suitable for wastewater disposal in small town.
Study on the Design Parameters for Slow Rate Land Treatment

Lui Zhonghan,

环境科学 , 1991,
Abstract: The main design parameters of , slow rate land treatment are hydraulic loading rate, constituent loading rates, application frequency and depth of water applied. As SR systems share better capability of deleting organic contaminants and the organic contaminant contents of municipal wastewater are far below the loading rates of SR system, the desigh parameters of SR system will be dominated by nitrogen concentration of wastewater. Under Kunming experimental conditions. 3.57g/m2·d of BOD5 loading amount will not affect the process performance, however, nitrogen loading rate abould not exceed 0.6-0.7 g/m2·d. Hydraulic loading rate based on nitrogen limits is 3-6m/a. Under given allowable loading rates, the depth of applied water should be lest than 7 cm and the intervals -between applications range from 4 to 5 days.
Abatement of Helminth Eggs and Bacterial and Viral Indicators in Soil after Land Application of Treated Sludges  [PDF]
Claudia Campos, Milena Beltrán, Marcela Duarte, Luz Medina, Francisco Lucena, Juan Jofre
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.512122

The reduction of helminth eggs, fecal coliforms and somatic coliphages present in sewage sludge after treatments and abatement by application to soil was determined. Traditional stabilization processes produced small changes in the concentrations of the parameters studied. In contrast, thermal treatments and liming produced dramatic reductions. Fecal coliforms were the most affected by both types of treatments; somatic coliphages showed some persistence after 30 minutes at 60°C; and both somatic coliphages and helminth eggs showed some persistence to storage in quick lime. However, both treatments supplied biosolid suitable for unrestricted application in agriculture. Abatement in soils in the climatic conditions tested (mild to cold temperatures and high relative humidity) was slow and took several months to reach the background levels. These results suggest that environmental conditions (temperature and humidity) play the main role in inactivating the microorganisms, since abatement was similar in different soil types. The extended permanence of pathogens and microbial indicators in soil after the application of treated sludges indicates that, in the normal weather conditions of the areas where the study was performed and the amounts of sludges applied, contaminant microbes are not easily mobilized from the complex matrixes that constitute the treated sludges and that consequently in normal conditions their release as diffuse pollution is of lesser importance.

Physicochemical Properties of Guanting Reservoir Sediment and Its Land Application

SU De-chun,HU Yu-feng,SONG Chong-wei,WU Fei-long,LIU Pei-bin,

环境科学 , 2007,
Abstract: Surface sediment of Guanting reservoir was dredged up and dewatered in field, pollutant and physicochemical characterizations were mensurated. The stabilization and agricultural land use of the sediment was also studied in the field. Result showed that the sediments have a higher clay content, bulk density (1.89g?cm-3) and lower porosity(23.8%), higher deoxidize material and available nitrogen, phosphorus concentration. Heavy metal and organochlorinated pesticides concentration lower than the class 2 of national standard for soil. Stabilized the sediment with sand soil and straw could improve the physical property and decrease the concentration of deoxidize material and available nitrogen, phosphorus. Stabilized sediment could be a suitable medium for alfalfa, tree and corn growth and use for agricultural land.
Wastewater Coal Ash Land Treatment and Groundwater Environment Effects

DONG Yuan-qing,WANG Li-xin,WANG Yong-chi,GUO Yan-wei,

地球学报 , 2001,
Abstract: Drainage of wastewater has not only polluted water environment but also resulted in the shortage of water resource. This paper gives an account of the multiple treatment research process, which includes the mixing of coal ash with wastewater, adsorption, and land treatment. The authors have found a way of combating wastewater with solid waste, employed land treatment of wastewater, analyzed the extent and the limits of the effects and suggested the way for solution.
Removal of Volatile Halohydrocarbona in Sewage by Rapid Infiltration of Land Treatment

Xu Meizhen,

环境科学 , 1990,
Abstract: This paper focuses on the efficiency of removing volatile haloid organic compounds from sewage with the method of land infiltration, which was compared with six usual treatment techniques. The results showed that land infiltration method was more effective.
Analysis on the Target Product from Sewage Sludge Pyrolysis and Experiments on Using the Char for Enhancing Plant Cultivation

SONG Xue-ding,CHEN De-zhen,WANG Zhong-hui,HE Wei,

环境科学 , 2011,
Abstract: Characteristics of sewage sludge pyrolysis under low temperatures were studied and the influences of reaction temperature and moisture content on products distribution and their properties were also investigated with a purpose to select a proper target product.After a dissective comparison,char produced from the pyrolysis process was chosen as the target product and then its effect on plant cultivation was checked by using it to plant garlic when blended into normal soil;also its heavy metals contents and t...
Land Use Changes in Xuzhou Coal Mining Area

BIAN Zhengfu,ZHANG Yanping,

地理学报 , 2006,
Abstract: The changing rules of the landscape elements and their distribution in east Xuzhou coal mining area are analyzed by means of remote sensing images obtained in 1979, 1987 and 2001. From 1987 to 2001, the land area for urbanization and industrial purpose got expanded; the intensity of construction was becoming higher and higher; the waterlogged area resulted from mining subsidence increased; and the lands covered by plants decreased. About 9.55% of the farmland was transformed into construction land and 5.15% into waterlogged land. About 5.25% of the construction land was converted into farmlands by reclamation, being mainly derilict mining sites; and 3.21% into waterlogged land, being mainly located near mining industrial square. Some 14.86% of the subsided waterlogged land was reclaimed into farmland, being mainly located near the edge of the subsiding basin with less subsidence; and 10.88% into construction land, being mainly located near Hanqiao and Quantai coal mining industrial squares. Generally speaking, the area of farmland decreased 13.04%, construction land increased 37.62% and waterlogged land resulted from mining subsidence increased 137.62%. So, according to the land condition, it is very important to reclaim and reuse subsided waterlogged land effectively for different purposes, such as eco-agriculture, aquaculture, forestry, animal husbandry and processing industry.
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