أخبار عاجلة

Nitrate Removal from Drinking Water by Sodium Thiosulfate and its impact on health.

Abstract: Nitrate is a stable and highly soluble ion with a low potential for precipitation or adsorption, nitrate is seldom present in geological formations and therefore contamination due to nitrate is mainly attributed to anthropogenic sources. Pollution of water resources by nitrate occurs due to many reasons which has effects …

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pH Adjustment for Industrial Wastewater

Adjusting the pH of water and wastewater is carried out by the addition of an acid or a base, depending on the target pH and process requirements. Some processes such as boiler operations and drinking water standards need neutral water at a pH of 7.           Water or wastewater is …

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Wastewater of Dairy Industry

Introduction          The dairy industry is generally considered to be the largest source of food processing wastewater in many countries. As awareness of the importance of improved standards of wastewater treatment grows, process requirements have become increasingly stringent. Although the dairy industry is not commonly associated with severe environmental problems, …

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Operational Factors Affecting Treatment of Wastewater by Anaerobic Processes

Anaerobic processes are defined as processes where neither oxygen nor nitrate is present. These processes are carried out by a large and varied group of micro-organisms which normally live in a symbiotic relationship. [1]        Anaerobic digestion has contributed a lot in conservation of   natural resources which cannot be replenished …

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Factors affect Dissolved Air Floatation (DAF) process performance

Flotation [1]          Flotation may be used in lieu of the normal clarification by solids-downward-flow sedimentation basins as well as thickening the sludge in lieu of the normal sludge gravity thickening. Water containing solids is clarified and sludges are thickened because of the solids adhering to the rising bubbles of …

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Sedimentation in Wastewater Treatment

Definition and Objective of Sedimentation [1]             Sedimentation is defined as a unit operation in which suspended particles are separated    from a suspension by gravitational settling .Coagulation  involves the addition of chemicals to induce faster aggregation and settling of initially finely divided suspended and colloidal particles. The objective of sedimentation …

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Application of Quality Assurance System in Wastewater Laboratories

Introduction The incomplete application of Quality Assurance system inside wastewater laboratories will lead to obtain inaccurate and unreliable laboratories results , and these inaccurate results will lead to incorrect decisions that will affect the proficiency of wastewater treatment plants and affect the treatment operations parameters of the plant , therefore …

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Heavy metals in water

Every day each one of us needs around 1.8 to 2.0 liters of water with the purpose of keeping in fine fettle body. Peoples who drink very little, water they drink a variety of drinks made from water such as tea, juice, some of these drinks contains very high concentrations …

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Application of Filtration in Wastewater Treatment

Introduction          Filtration is a fundamental unit operation that separates suspended particle matter from water. Although industrial applications of this operation vary significantly, all filtration equipment operate by passing the solution or suspension through a porous membrane or medium, upon which the solid particles are retained on the medium’s surface …

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GREEN ADSORBENTS AS A NEW APPROCH FOR WATER PURIFICATION

Water pollution Water pollution is a major problem affecting people across the world. Heavy metals and dyes are major pollutants that cause many problems to the health of humans and ecosystems. Several treatment technologies are available to reduce the effects of pollutants. These problems pushing the world to have a …

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Advanced Oxidation Processes Basics and Applications

Introduction                Anthropogenic activities include rapidly growing industrialization, a series of new constructions, many fold increases in transportation, aerospace movements, developmental and enhancement in technologies, that is, nuclear power, pharmaceutical, pesticides, herbicides, agriculture, and so on. These are all the most desirable activities for human development and welfare, but they …

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Removal of Pollutants from Potable Water by Aeration

INTRODUCTION            Aeration brings water and air in close contact in order to remove dissolved gases (such as carbon dioxide) and oxidizes dissolved metals such as iron, hydrogen sulfide, and volatile organic chemicals (VOCs). Aeration is often the first major process at the treatment plant. During aeration, constituents are removed …

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Water Desalination

Introduction Only 1 percent of the earth’s water is liquid freshwater; 97 percent of available water resources are contaminated by salt. This makes desalination an essential component of efforts to address water shortages, especially in densely populated coastal regions. Egypt faces nowadays severe challenges to our ability to meet our …

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Aerobic Treatment with Biofilm Systems

Aerobic Treatment with Biofilm Systems Biofilms          Biofilms are small ecosystems usually consisting of three layers of differing thickness, which change in thickness and composition with location and over time (Meyer-Reil 1996). In the first phase of colonization, macromolecules are adsorbed  at clean solid surfaces (proteins, polysaccharides, lignin; Wingender and …

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Inorganic & Organic Coagulants

Introduction Coagulation is an essential phenomenon in industrial wastewater treatment. Inorganic coagulants (salts of multivalent metals) are being commonly used due to its low cost and ease of use. However, their application is constrained with low flocculating efficiency and the presence of residue metal concentration in the treated water. Organic …

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Selected Nanomaterials applications in waste water treatment

Selected Nanomaterials applications in waste water treatment Ahmed Hasham (M.Sc. Env. Chemistry) /  Ahmedhasham83@outlook.com Introduction: Water pollution is the most difficult environmental challenges facing society. Therefore, the release of pollutants from sewage or industrial wastewater in the must be considered as a threat to the environment. Characterizing the physical, chemical …

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بعض تطبيقات تقنية النانوتكنولوجي في معالجة مياه الصرف

بعض تطبيقات تقنية النانوتكنولوجي في معالجة مياه الصرف بقلم/ أحمد محمد هشام ماجستير كيمياء تحليلية Ahmedhasham83@outlook.com مقدمة يعد تلوث المياه أصعب التحديات البيئية التي تواجه المجتمع. لذلك ، يجب اعتبار الملوثات من مياه الصرف الصحي أو مياه الصرف الصناعية تهديدًا للبيئة. ولذلك يعتبر تميّز الجوانب الفيزيائية والكيميائية والبيولوجية للمياه الخام …

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ACTIVATED CARBON PRODUCTION & APPLICATIONS

ACTIVATED CARBON PRODUCTION & APPLICATIONS What is activated Carbon? Activated carbon is a form of carbon that has been treated to make it extremely porous and thus to have a very large surface area available for adsorption and chemical reactions. It is usually derived from charcoal (also called active carbon, …

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Heavy metals removal using modified leaves biomass

Heavy metals removal using modified leaves biomass By: Ahmed Hasham M.Sc. Env. Analytical Chemistry Introduction: Continuous industrial development has resulted in raised levels of toxic heavy metals. This has been entangled, almost everywhere, in most industrial applications involving leakage and redistribution of heavy metals, such as metallurgy, iron and steel, …

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الكربون النشط

كربون

الكربون النشط هو شكل من أشكال الكربون الذي تم معالجته لجعله مساميًا للغاية ، وبالتالي يكون لديه مساحة كبيرة جدًا متاحة للادمصاص والتفاعلات الكيميائية. أهمية الكربون النشط: يعتبر الكربون النشط أنجح المواد الممتزة بسبب: قدرتة العالية علي الامتزاز للملوثات مثل الأصباغ ، المعادن الثقيلة ، المستحضرات الدوائية والفينولات. مساحة السطح …

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