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Search Results: 1 - 10 of 6434 matches for " Biological treatments "
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Methods Used in Urban Waste Treatment
OROIAN I.,M. PROOROCU,Antonia ODAGIU,I. BRASOVEAN
Proenvironment Promediu , 2010,
Abstract: The paper presents the main options aiming the treatment of urban waste consisting mainly of the household andthose resulting from industrial activities, acordin to the present EU legislation. The aspects of the two major types ofwaste treatment, mechanical biological treatment and incineration respectively are described. Distinction is madebetween mechanical and biological treatment of aerobic and anaerobic issues being addressed and biological dryingprocess. The result of these processes is reflected in obtaining products that can be used as soil improvers. With regardto incineration, the basic components of industrial installations for the purpose, and usability of products resulting fromtheir processing, most often, various types of solid fuel are presented. The paper also highlights the importance of thesetreatments in efficient waste management planning.
Recent Developments in Biological Waste Gas Purification
生物净化废气技术的进展

ZHANG Tian-Tian,LI Jian-Jun,CEN Ying-Hua,SUN Guo-Ping,
张甜甜
,李建军,岑英华,孙国萍

微生物学通报 , 2007,
Abstract: Biological treatment provides an cost effective and environmentally friendly alternative for many waste gas emissions.Biological waste air treatment is achieved at ambient temperatures,it does not generate secondary pollutants,such as nitrogen oxides,it has become in many instances the method of choice for the control of low concentrations of odors,volatile organic compounds,or hazardous air pollutants in large air streams.A significant body of knowledge and experience has been generated on biological waste gas purification.Examples of waste gas treatment are presented in this paper,such as at municipal wastewater treatment plants,emission from live stock industries,sulfur emissions from industries.This paper discusses the problem of how to prevent biomass clogging and introduces the application of molecular biotechnology in biologeical treatment.The development trend of the Biological treatment are discussed.We hope the biological treatments can gain widely application in China.
Recent Developments in Biological Waste Gas Purification
生物净化废气技术的进展

ZHANG Tian-Tian,LI Jian-Jun,CEN Ying-Hua,SUN Guo-Ping,
张甜甜
,李建军,岑英华,孙国萍

微生物学报 , 2007,
Abstract: Biological treatment provides an cost effective and environmentally friendly alternative for many waste gas emissions. Biological waste air treatment is achieved at ambient temperatures, it does not generate secondary pollutants, such as nitrogen oxides, it has become in many instances the method of choice for the control of low concentrations of odors, volatile organic compounds, or hazardous air pollutants in large air streams. A significant body of knowledge and experience has been generated on biological waste gas purification. Examples of waste gas treatment are presented in this paper, such as at municipal wastewater treatment plants, emission from live stock industries, sulfur emissions from industries. This paper discusses the problem of how to prevent biomass clogging and introduces the application of molecular biotechnology in biologeical treatment.The development trend of the Biological treatment are discussed.We hope the biological treatments can gain widely application in China.
Flight dynamics of some Lepidoptera species of sugar beet and possibilities their control (Transylvania-Romania)
Muresanu Felicia,Ciochia V.
Zbornik Matice Srpske za Prirodne Nauke , 2006, DOI: 10.2298/zmspn0610213m
Abstract: In this paper, the authors present the obtained results regarding the flight dynamics of some Lepidoptera species in sugar beet crops in Transylvania (the central part of Romania). In order to limit the appearance of mentioned pests to the economic threshold, Trichogramma spp. were obtained in laboratory conditions at ARDS Turda and SBRDS Brasov. The experiments were conducted in production areas on 0,5 ha minimum for each variant. The variants included four Trichogramma species: T. dendrolimi, T. evanescens, T. maidis, T. buesi that were manually released three times: the first release, 10.000 individuals/ha, the second, 120.000 individuals/ha and the third, 150.000 individuals/ha. The first release was performed at the beginning of the Lepidoptera flight, the second at the maximum flight and the third 5 days after the second. The efficiency of T. maidis was between 75-90%, of T. evanescens, it was between 73-88%, of T. dendrolimi, it was between 85-92% and of T. buesi 79-82%. Among the Trichogramma species utilized, T. dendrolimi and T. evanescens were very efficient in the reduction of mentioned pests. Root production was significantly higher compared to the untreated variant, 4,0-4,7 t/ha more were recorded after the application of biological treatments with T. evanescens and T. dendrolimi.
Combined Processes for Phosphorus Removal from a Dairy Plant Wastewater: Conditions Influencing the Chemical Process
O. Balamane-Zizi,H. Ait-Amar
Journal of Environmental Science and Technology , 2009,
Abstract: The aim of this study is to asses the efficiency of a possible combination of the chemical and biological processes to enhance the phosphorus removal from a dairy plant wastewater which contains important amounts of phosphates and organic matter (PO43a€“ -P in range of 9-45 mg L-1 and COD in range of 200-5000 mg L-1). In a first time, batch tests conducted in jar test were used to determine the pH and the molar ratios Fe:P and Al:P in order to optimise the chemical process. In this case, pH = 7, molar ratio Al: P = 3 and pH = 4 ; molar ratio Fe: P = 3 were obtained, respectively for aluminium sulphate and ferric chloride used as precipitants. In a second time, kinetics of biological phosphorus removal were studied by batch tests at three temperatures (13, 23 and 33 °C) in order to show the importance of temperature in biological processes. These tests were conducted with the mixture of supernatant obtained after the precipitation of phosphates at optimum conditions (by ferric chloride and aluminium sulphate) and activated sludge originate from wastewater treatment plant of Staoueli at east of Algiers. The results obtained indicated that biological phosphorus removal could indeed be feasible to enhance the remove of phosphates from dairy processing wastewaters. The effect of temperature had also been studied in order to show the importance of temperature in biological processes. The results obtained showed that an increase of temperature accelerates the process.
Potential Use of Microbial Electrolysis Cells in Domestic Wastewater Treatment Plants for Energy Recovery
Adrián Escapa,María Isabel San-Martín,Antonio Morán
Frontiers in Energy Research , 2014, DOI: 10.3389/fenrg.2014.00019
Abstract: Globally, large amounts of electrical energy are spent every year for domestic wastewater (dWW) treatment. In the future, energy prices are expected to rise as the demand for energy resources increases and fossil fuel reserves become depleted. By using appropriate technologies, the potential chemical energy contained in the organic compounds present in dWWs might help to improve the energy and economic balance of dWW treatment plants. Bioelectrochemical systems (BESs) in general and microbial electrolysis cells (MECs) in particular represent an emerging technology capable of harvesting part of this energy. This study offers an overview of the potential of using MEC technology in domestic wastewater treatment plants (dWWTPs) to reduce the energy bill. It begins with a brief account of the basics of BESs, followed by an examination of how MECs can be integrated in dWWTPs, identifying scaling-up bottlenecks and estimating potential energy savings. A simplified analysis showed that the use of MEC technology may help to reduce up to ~20% the energy consumption in a conventional dWWTP. The study concludes with a discussion of the future perspectives of MEC technology for dWW treatment. The growing rates of municipal water and wastewater treatment markets in Europe offer excellent business prospects and it is expected that the first generation of MECs could be ready within 1–4 years. However, before MEC technology may achieve practical implementation in dWWTPs, it need not only to overcome important techno-economic challenges, but also to compete with other energy-producing technologies.
Propolis in Dogs: Clinical Experiences and Perspectives (A Brief Review)  [PDF]
Nelly Tovar Betancourt, Lucila García-Contreras, Tonatiuh Alejandro Cruz Sánchez
Open Journal of Veterinary Medicine (OJVM) , 2015, DOI: 10.4236/ojvm.2015.51002
Abstract: In light of the scarcity of novel therapeutic agents that are effective, the pharmaceutical industry has found a newer source of therapeutic compounds in natural products and herbal medicine to address the current health problems in humans and animals. What is particularly promising about these agents is that they produce fewer side effects and are more cost effective than synthetic compounds. This means greater availability of these treatments particularly for less developed countries who can’t afford expensive treatments. The reduced side effects also mean greater patient tolerance and increased compliance thereby yielding maximal therapeutic effect without negatively impacting on quality of life. Among the natural products more frequently employed nowadays is propolis, a resin that is routinely collected by bees (Apis mellifera). Propolis contains flavonoids, caffeic acid esters and diterpenic acids, which provide the bactericidal, antiviral and antifungal properties to this product. The use of propolis to address a variety of conditions in small animal species is beginning to play an important role in the currently available treatments. Its use appears to be an effective treatment with no side effects at low cost. This paper reviews the different applications of this compound to treat diseases in dogs.
Role of Plasma Surface Treatments on Wetting and Adhesion  [PDF]
Rory Wolf, Amelia Carolina Sparavigna
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.26052
Abstract: There are many current and emerging wetting and adhesion issues which require an additional surface processing to enhance interfacial surface properties. Materials which are non-polar, such as polymers, have low surface energy and therefore typically require surface treatment to promote wetting of inks and coating. One way of increasing surface energy and reactivity is to bombard a polymer surface with atmospheric plasma. When the ionized gas is discharged on the polymer, effects of ablation, crosslinking and activation are produced on its surface. In this paper we will analyse the role of plasma and its use in increasing the surface energy to achieve wettability and improve adhesion of polymeric surfaces.
Effect of the Heat Treatments on the Dopes Segregation in Polycrystalline Silicon Films  [PDF]
Salima Silini, Baghdadi Chouial, Bouzid Hadjoudja, Ouissem Benhalima, Sana Yousfi, Allaoua Chibani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.39138
Abstract: In this work we are interested in studying the effect of the heat treatments on the dopant segregation at the grain boundaries in the polycrystalline silicon films. The obtained results have shown that the heat treatments reduce the number of segregation sites at the grains boundaries, and consequently they limit the structural changes that can appear there and the quantity of the dope atoms that can accumulate in these boundaries. In addition they are more and more dopant that are found inside the grains when the temperature of the heat treatment increases. On the other hand, we established that the arsenic atoms have a strong tendency to the segregation than the boron atoms, and we have noticed a strong migration of arsenic atoms from the boundaries towards the grains under the effect of the heat treatments. It was also shown that the segregation of arsenic atoms at the grains boundaries is about 4 times higher than that of the boron atoms.
The Effect of Several Service and Weathering Parameters on Tensile Properties of PVC Pipe Materials  [PDF]
N. A. Saad, M. H. Al-Maamory, M. R. Mohammed, A. A. Hashim
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.311114
Abstract: For water and sewer pipes, PVC is considered to be one of the best row materials. Due to its physical, chemical and industrial significant properties, PVC is commercially invited to be in the first position. Many other traditional raw materials; e.g. iron, concrete, polyethylene and vitrified clay (VC), are coming in second position. This work is conducted to study the tensile properties of two different types of PVC raw materials (named as gray and white) for water pipe manufacturing by implementing different test conditions. The samples were prepared by cutting off the pipe to an individual cross sectional size rings. Afterward, they were softened smoothly by heating the ring samples to obtain flat standard tensile test specimen. The influence of strain rate (crosshead speed), temperature and UV radiation on the tensile properties of PVC pipe’s row material were investigated. The selected experimental test temperatures are (28℃, 50℃ and 70℃), the selected crosshead speeds are (5, 50 and 100 mm/min) and the UV treatment exposure times are (168, 408, 744 and 1080) hours. The result shows that the gray PVC pipes have tensile strength greater than white PVC pipes. The yield stress and modulus of elasticity are directly proportion to strain rate and inversely proportion to the treatment temperature of both PVC samples. However, the fracture strain was increased with temperature and decreased with strain rate. UV treatment didn’t show a significant effect on the yield stress and modulus of elasticity. This is an indication of PVC long time stability.
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