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Methods of wastewater treatment

Xem 1-20 trên 30 kết quả Methods of wastewater treatment
  • This article discusses testing results of industrial trial of new wastewater disinfection comprised of combined use of ultrasonic and ultraviolet methods at final stage of wastewater treatment aimed at elimination of pathogenic organisms, thereby preventing spread of infectious diseases.

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  • Research Reports IWMI’s mission is to improve the management of land and water resources for food, livelihoods and environment. In serving this mission, IWMI concentrates on the integration of policies, technologies and management systems to achieve workable solutions to real problems—practical, relevant results in the field of irrigation and water and land resources.

    pdf39p nhatro75 12-07-2012 59 7   Download

  • This volume covers the technologies that are applied to the treatment and purification of water. Those who are generally familiar with this field will immediately embrace the subject as a treatise on solid-liquid separations. However, the subject is much broader, in that the technologies discussed are not just restricted to pollution control hardware that rely only upon physical methods of treating and purifymg wastewaters.

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  • The wastewater treatment plant is an extremely important infrastructure to ensure the quality of life, water use of human life, and other ways to ensure water quality for the natural environment. In the operation of it, there are always potential hazards affecting the health of the workers working in the factory. The study was performed using the Semi-quantitative risk assessment method to calculate the values of operational risks in the water treatment plant (WWP).

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  • Sn02 Thin films on titanium metal subotrates have been produced by spray pyrolysis method. This type film of has good stability for anodic dissolving in medium contained high concentration of CI- ions and good possibility of electron exchange. Sn02/Ti electrodes have been used in the electrochemical oxidation of phenol in alkaline medium contained CI- ions with high efficiency. Therefore, it has made them the possibility of new application in the wastewater treatment by electrochemical method.

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  • Distillery is one of the most highly polluting and growth oriented industries in India with reference to the extent of water pollution and the quantity of wastewater generated. Apart from distilleries, fermentation industries, sugar mills, pharmaceutical companies and other molasses based industries are also responsible for contamination and generation of waste water. The distillery waste water contains dark brown colored recalcitrant compounds collectively termed as melanoidin polymers. These polymers cause oxygen depletion and increase BOD.

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  • Human activities have a large and important impact on the environment. Naturally occurring elements or compounds are often concentrated and redistributed in the environment through industrial processes, power production, and consumer activity. For example, lead, which is found in naturally occurring mineral deposits, has become a major pollutant through its use in batteries, paints, and gasoline additives.

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  • A classroom debate at the Wharton School turned out to be a preface to this book. The professor, an economist, handed out an internal memo prepared by Lawrence Summers, then chief economist of the World Bank. He wrote: Just between you and me, shouldn’t the World Bank be encouraging more migration of the dirty industries to the LDCS [less developed countries]? I can think of three reasons:

    pdf357p 951864273 11-05-2012 69 24   Download

  • RNA turnover and processing have now been demonstrated to be important steps that directly affect protein synthesis and the cell’s ability to survive in nature. However, the analysis of mRNA decay and polyadenylation in Escherichia coli has long been considered technically difficult. The development over the past 15 years of methods for the isolation and characterization of both mRNA and polyadenylated species has made the study of these important pathways of RNA metabolism more straightforward (Arraiano et al., 1988; O’Hara et al., 1995; Mohanty and Kushner, 1999)....

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  • The extent of pollution and toxicity depends upon the raw material used, pulping method, and pulp bleaching process adapted by the pulp and paper mills. For example, the pollution load from hardwood is lower than softwood. On the other hand, the spent liquor generated from pulping of nonwood fiber has a high silica content. Volumes of wastewater discharged may vary from near zero to 400 m3 per ton of pulp depending on the raw material used, manufacturing process, and size of the mill [6].

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  • Intensity of use of freshwater resources (both surface and groundwater) is expressed as gross abstractions per capita, as a percentage of total available renewable freshwater resources, including inflows from neighbouring countries (see below) and as a percentage of internal resources. It has to be noted that when measured at national level these indicators may hide significant variations at territorial level. Wastewater treatment connection rates show the percentage of the national population actually connected to public waste water treatment plants.

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  • In this article, wastewater containing 2,4,6 trinitrotoluen (TNT) was treated by internal microelectrolysis with bimetal Fe-Cu materials. Components of TNT pollutant content was identified by HPLC method. Examined factors: pH, time, temperature, concentration of Fe-Cu bimetal to efficient treatment of TNT in the wastewater. With conditions at pH 5, bimetal Fe-Cu dosage of 50 g for l litre of wastewater, TNT original content in the wastewater infected about 95-106.4 mg/l, temperature of 25 0 C, after 6 hours of processing time, content TNT rest 0.2 - 0.5 mg/l, after 6 hours not observed.

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  • In this study, we report for the first time on the photocatalytic decolorization of Procion 032 Carmine Red (PC032) using titania nanotubes (TNTs). Photocatalysts of TNTs were synthesized by hydrothermal method under strong alkali condition using powder TiO2 as a precursor and calcined at different temperatures (100 - 700oC).

    pdf6p everydaywish 25-12-2018 18 0   Download

  • Wastewater treatment has gained increased importance worldwide due to increasing demand on fresh clean water supplies. Biological treatment achieved by the activities of micro-organisms, is one of the most widely used processes in the treatment of wastewater.

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  • This study aimed to evaluate the ability of magnesium chloride modified carbonized rice hull (MCRH) material for ammonium removal from synthetic and domestic wastewater. The MCRH material was prepared by using waste rice hull from a household rice-processing factory and magnesium chloride salt via a simple mixing and annealing method. The material was then characterized by scanning electron microscopy and energy-dispersive X-ray spectroscopy.

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  • Aquatic pollution occurs due to the discharge of harmful substances, chemicals or microorganisms into water bodies i.e. a stream, river, lake, ocean, aquifer, or other body of water resulting in contamination & degradation of water quality and rendering it unsuitable for human use or the environment. Many advanced water treatment techniques are followed before discharging this polluted water into the surrounding environment. However some limitations is there. In this context, Biofilms have become the important part of biological treatment of municipal waste water.

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  • The objective of this study is to develop an energy and nutrients recovering wastewater treatment process combining physicochemical and biological methods for NRP wastewater.

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  • The simultaneous determination of Zn2+, Cd2+, Cu2+, Pb2+ in acid mine drainage (AMD) by differential pulse-anodic stripping voltammetrics (DPASV) with high sensitivity, selectivity, and accuracy is difficult because of many influential factors in the waste-water. This paper presents the results of studying supporting electrolyte for simultaneous determination of these ions in AMD in Mao Khe, Quang Ninh province to serve the wastewater treatment process.

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  • The research results of poly(1-naphthylamine)/Fe3O4 (PNA/Fe3O4) nanocomposites synthesized by a chemical method for As(III) wastewater treatment are presented in this paper. XRD patterns and TEM images showed that the Fe3O4 grain size varied from 13 to 20 nm. The results of Raman spectral analysis showed that PNA participated in part of the PNA/Fe3O4 composite samples. The grain size of PNA/Fe3O4 composite samples is about 25–30 nm measured by SEM.

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  • When one is confronted with a new problem that involves the collection and analysis of data, two crucial questions are: How will using statistics help solve this problem? And, Which techniques should be used? This book is intended to help environmental engineers answer these questions in order to better understand and design systems for environmental protection. The book is not about the environmental systems, except incidentally. It is about how to extract information from data and how informative data are generated in the first place.

    pdf0p crazy_sms 10-05-2012 95 28   Download

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