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Showing posts from March, 2026

Difference Between Oven Dry Method and Pycnometer Method in Soil Testing

Difference Between Oven Dry Method and Pycnometer Method In soil mechanics and geotechnical engineering , different laboratory methods are used to determine the water content and other properties of soil. Two commonly used methods are the Oven Dry Method and the Pycnometer Method . Both methods are used in soil testing laboratories, but they differ in their procedure, equipment, and accuracy. 1. Oven Dry Method The Oven Dry Method is the most common method used to determine the water (moisture) content of soil . In this method, a wet soil sample is dried in an oven at a temperature of 105°C – 110°C until all the moisture evaporates. Principle Water present in the soil evaporates when heated in an oven. The difference between the wet weight and dry weight gives the amount of water in the soil. Uses Determining moisture content of soil Soil compaction tests Foundation engineering studies 2. Pycnometer Method The...

TDS Meter – Working Principle, Uses, Procedure and Advantages

TDS Meter – Definition, Working Principle, Uses and Procedure A TDS Meter is an electronic device used to measure the Total Dissolved Solids (TDS) in water. TDS represents the amount of dissolved substances such as minerals, salts, metals, and organic matter present in water. TDS is usually measured in ppm (parts per million) or mg/L (milligrams per liter) . It is an important parameter used to determine the quality of drinking water and wastewater. What is TDS? Total Dissolved Solids (TDS) refers to the total concentration of dissolved substances present in water. These substances include: Calcium Magnesium Sodium Potassium Chlorides Sulfates Bicarbonates High TDS levels may affect the taste, hardness, and quality of water . Working Principle of TDS Meter A TDS meter works on the principle of electrical conductivity . Dissolved solids in water increase its ability to conduct electricity. The meter measu...

Determination of Total Solids, Total Dissolved Solids and Settleable Solids – Environmental Engineering Lab Experiment

Determination of Total Solids, Total Dissolved Solids (TDS) & Settleable Solids – Lab Experiment Solids present in water or wastewater can be in dissolved or suspended form. These solids affect the quality, clarity, and usability of water . Determining different types of solids is important in water and wastewater analysis. The main categories of solids measured in water are: Total Solids (TS) – the total amount of dissolved and suspended matter present in water. Total Dissolved Solids (TDS) – solids that pass through a filter and remain dissolved in water. Settleable Solids – suspended solids that settle at the bottom of water under gravity. Aim To determine the Total Solids (TS), Total Dissolved Solids (TDS), and Settleable Solids present in the given water or wastewater sample. Apparatus Required Evaporating dish Hot air oven Desiccator Analytical balance Measuring cylinder Filter paper Imhoff cone (for settlea...

Jar Test for Determining Optimum Dosage of Coagulant – Environmental Engineering Lab Experiment

Conducting Jar Test for Determining Optimum Dosage of Coagulant – Lab Experiment Coagulation is an important process in water treatment used to remove suspended particles, turbidity, and impurities from water. Chemicals such as alum (aluminium sulfate) are commonly used as coagulants. A jar test is performed to determine the optimum amount of coagulant required for effective removal of turbidity and suspended solids from water. Aim To determine the optimum dosage of coagulant for the given water sample using a jar test. Apparatus Required Jar test apparatus with multiple stirrers Beakers (1 L capacity) Measuring cylinder Pipettes Glass rod Turbidity meter (optional) Chemicals Required Alum (Aluminium Sulfate) solution Distilled water Water sample Theory In the coagulation process, chemicals such as alum are added to water to destabilize suspended particles. These particles then combine to form larger pa...

Determination of Biochemical Oxygen Demand (BOD) – Environmental Engineering Lab Experiment

Determination of Biochemical Oxygen Demand (BOD) – Lab Experiment Biochemical Oxygen Demand (BOD) is the amount of oxygen required by microorganisms to decompose organic matter present in water or wastewater under aerobic conditions. It is an important indicator used to measure the pollution level of water bodies . BOD is usually expressed in milligrams per liter (mg/L) and is commonly measured over a 5-day incubation period at 20°C . Aim To determine the Biochemical Oxygen Demand (BOD) of the given water or wastewater sample. Apparatus Required BOD bottles (300 mL capacity) Incubator maintained at 20°C Pipettes Measuring cylinder Conical flask Burette Chemicals Required Manganous sulfate solution Alkaline iodide azide reagent Concentrated sulfuric acid Standard sodium thiosulphate solution Starch indicator Distilled water Theory Microorganisms present in water consume dissolved oxygen while decompo...

Determination of Chemical Oxygen Demand (COD) – Environmental Engineering Lab Experiment

Determination of Chemical Oxygen Demand (COD) – Lab Experiment Chemical Oxygen Demand (COD) is an important parameter used to measure the amount of organic pollutants present in water or wastewater . It indicates the amount of oxygen required to chemically oxidize organic matter present in the sample. COD is widely used to determine the pollution level of wastewater and is expressed in milligrams per liter (mg/L) . Aim To determine the Chemical Oxygen Demand (COD) of the given water or wastewater sample using the dichromate reflux method. Apparatus Required COD digestion flask Reflux condenser Burette Pipette Conical flask Heating mantle or hot plate Chemicals Required Potassium dichromate (K₂Cr₂O₇) solution Concentrated sulfuric acid (H₂SO₄) Ferrous ammonium sulfate (FAS) solution Ferroin indicator Silver sulfate catalyst Mercuric sulfate Distilled water Theory In the COD test, organic matter presen...

Determination of Dissolved Oxygen in Water – Environmental Engineering Lab Experiment

Determination of Dissolved Oxygen (DO) in Water – Lab Experiment Dissolved Oxygen (DO) refers to the amount of oxygen present in water. It is an important parameter used to assess the quality of water and the health of aquatic ecosystems . Adequate dissolved oxygen is necessary for the survival of fish and other aquatic organisms. The dissolved oxygen content in water is usually expressed in milligrams per liter (mg/L) . Aim To determine the dissolved oxygen (DO) present in the given water sample using the Winkler method. Apparatus Required Dissolved Oxygen (DO) bottle Burette Pipette Conical flask Measuring cylinder Chemicals Required Manganous sulfate solution Alkaline iodide azide reagent Concentrated sulfuric acid Standard sodium thiosulphate solution Starch indicator Distilled water Theory Dissolved oxygen in water is determined by the Winkler method . In this method, dissolved oxygen oxidizes mang...

Determination of Residual Chlorine in Water – Environmental Engineering Lab Experiment

Determination of Residual Chlorine in Water – Lab Experiment Residual chlorine is the amount of chlorine that remains in water after the disinfection process. It ensures that harmful microorganisms are continuously destroyed during storage and distribution of water. Determining residual chlorine is important in water treatment plants to confirm that sufficient chlorine is present to maintain safe and disinfected drinking water . Aim To determine the residual chlorine in a given water sample using the Orthotolidine (OT) or DPD method. Apparatus Required Comparator or colorimeter Test tubes Measuring cylinder Pipette Water sample Chemicals Required Orthotolidine reagent or DPD reagent Distilled water Theory When chlorine is added to water, part of it reacts with impurities while the remaining chlorine stays in the water as residual chlorine . This residual chlorine provides continued protection against microbia...

Conducting Break Point Chlorination Test – Environmental Engineering Lab Experiment

Conducting Break-Point Chlorination Test – Lab Experiment Chlorination is one of the most widely used methods for disinfection of drinking water . When chlorine is added to water, it reacts with impurities such as ammonia, organic matter, and other reducing substances. The point at which the chlorine demand of water is satisfied and free residual chlorine begins to appear is known as the break-point chlorination . Conducting a break-point chlorination test helps determine the correct amount of chlorine required for effective water disinfection . Aim To determine the break-point chlorination of a water sample by adding different doses of chlorine and measuring the residual chlorine. Apparatus Required Beakers or conical flasks Measuring cylinder Pipettes Glass rod Comparator or colorimeter Water samples Chemicals Required Bleaching powder solution or chlorine solution Orthotolidine reagent or DPD reagent Distilled wa...

Determination of Available Chlorine in Bleaching Powder – Environmental Engineering Lab Experiment

Determination of Available Chlorine in Bleaching Powder – Lab Experiment Bleaching powder is widely used as a disinfectant in water treatment plants for killing harmful microorganisms. The effectiveness of bleaching powder depends on the amount of available chlorine present in it. Therefore, determining the available chlorine content is important for ensuring proper disinfection. The available chlorine in bleaching powder is usually expressed as a percentage (%) . Aim To determine the percentage of available chlorine in the given bleaching powder sample using the iodometric titration method. Apparatus Required Burette Pipette Conical flask Beakers Measuring cylinder Glass rod Chemicals Required Bleaching powder solution Potassium iodide (KI) solution Standard sodium thiosulphate (Na₂S₂O₃) solution Starch indicator Acetic acid Distilled water Theory Available chlorine in bleaching powder is determined b...

Determination of Fluorides in Water – Environmental Engineering Lab Experiment

Determination of Fluorides in Water – Lab Experiment Fluoride is a naturally occurring element found in many water sources. In small amounts, fluoride is beneficial for dental health, but excessive fluoride in drinking water can cause dental fluorosis and skeletal fluorosis . Therefore, determining the fluoride concentration in water is important for maintaining safe drinking water standards. The fluoride concentration in water is usually expressed in milligrams per liter (mg/L) . Aim To determine the fluoride content in the given water sample using the SPADNS colorimetric method. Apparatus Required Colorimeter or spectrophotometer Beakers Volumetric flasks Pipettes Measuring cylinder Water sample Chemicals Required SPADNS reagent Zirconyl acid reagent Standard fluoride solution Distilled water Theory Fluoride concentration in water is commonly determined using the SPADNS colorimetric method . In this m...

Determination of Hardness of Water – Environmental Engineering Lab Experiment

Determination of Hardness of Water – Lab Experiment Hardness of water is mainly caused by the presence of dissolved salts of calcium and magnesium . Hard water forms scale in pipes and boilers and reduces the efficiency of soaps and detergents. Therefore, determining water hardness is important for assessing water quality and suitability for domestic and industrial use . Hardness is usually expressed in terms of milligrams per liter (mg/L) as CaCO₃ . Aim To determine the total hardness of the given water sample using the EDTA titration method. Apparatus Required Burette Pipette Conical flask Beakers Measuring cylinder Water sample Chemicals Required Standard EDTA solution Ammonia buffer solution Eriochrome Black T indicator Distilled water Theory The hardness of water is determined by titrating the water sample with a standard solution of EDTA (Ethylenediaminetetraacetic acid) . EDTA forms stable complexe...

Determination of Chlorides in Water – Environmental Engineering Lab Experiment

Determination of Chlorides in Water – Lab Experiment Chlorides are commonly present in natural water and wastewater. They mainly occur in the form of sodium chloride, calcium chloride, and magnesium chloride . High chloride concentration in water can affect its taste and may cause corrosion in pipelines and boilers. Therefore, determining the chloride content is important for evaluating water quality and suitability for drinking or industrial use . Aim To determine the chloride content in the given water sample by titration with a standard silver nitrate solution. Apparatus Required Burette Pipette Conical flask Beakers Measuring cylinder Water sample Chemicals Required Standard silver nitrate (AgNO₃) solution Potassium chromate indicator Distilled water Theory The chloride content of water is determined by titrating the water sample with a standard solution of silver nitrate . During the titration, silver ...

Determination of Alkalinity of Water – Environmental Engineering Lab Experiment

Determination of Alkalinity of Water – Lab Experiment Alkalinity of water is the measure of its capacity to neutralize acids. It is mainly caused by the presence of bicarbonates, carbonates, and hydroxides in water. Determining alkalinity is important for evaluating water quality and the effectiveness of water treatment processes . Alkalinity is generally expressed in milligrams per liter (mg/L) as CaCO₃ . Aim To determine the alkalinity of the given water sample by titration with a standard acid solution. Apparatus Required Burette Pipette Conical flask Beakers Measuring cylinder Water sample Chemicals Required Standard sulfuric acid (H₂SO₄) or hydrochloric acid (HCl) Phenolphthalein indicator Methyl orange indicator Distilled water Theory Alkalinity in water is determined by titrating the water sample with a standard acid solution. Indicators such as phenolphthalein and methyl orange are used to detect...

Determination of Acidity of Water – Environmental Engineering Lab Experiment

Determination of Acidity of Water – Lab Experiment Acidity in water refers to the presence of substances that can neutralize bases. It is mainly caused by dissolved carbon dioxide, mineral acids, and salts of strong acids with weak bases. Determining the acidity of water is important for evaluating water quality and its suitability for drinking or industrial use . The acidity of water is generally expressed in terms of milligrams per liter (mg/L) as CaCO₃ . Aim To determine the acidity of the given water sample by titration using a standard alkali solution. Apparatus Required Burette Pipette Conical flask Beakers Measuring cylinder Water sample Chemicals Required Standard sodium hydroxide (NaOH) solution Methyl orange indicator Phenolphthalein indicator Distilled water Theory Acidity in water is determined by titrating the water sample with a standard solution of sodium hydroxide. During the titration, in...

Determination of Conductivity of Water – Environmental Engineering Lab Experiment

Determination of Conductivity of Water – Lab Experiment Electrical conductivity is an important parameter used to measure the ability of water to conduct electricity . It depends on the presence of dissolved ions such as salts, minerals, and other inorganic substances in water. The higher the concentration of dissolved salts in water, the greater the conductivity. Therefore, conductivity measurement is widely used to evaluate water quality and the level of dissolved impurities . Aim To determine the electrical conductivity of a given water sample using a conductivity meter. Apparatus Required Conductivity meter Conductivity cell or probe Beakers Distilled water Water sample Tissue paper Theory Electrical conductivity is defined as the measure of the ability of water to carry an electric current. It occurs due to the presence of dissolved ions such as sodium, calcium, magnesium, chloride, and sulfate. Conductivity is...

Determination of pH of Water – Lab Experiment

Determination of pH of Water – Lab Experiment The pH of water is an important parameter used to measure the acidity or alkalinity of a water sample. It helps in assessing water quality and determining whether the water is suitable for drinking, domestic use, or industrial purposes. The pH scale ranges from 0 to 14 . A pH value less than 7 indicates acidic water, pH equal to 7 indicates neutral water, and pH greater than 7 indicates alkaline water. Aim To determine the pH value of a given water sample using a pH meter. Apparatus Required pH meter Glass electrode Beakers Distilled water Buffer solution Water sample Tissue paper Theory The pH value represents the concentration of hydrogen ions present in a solution. A pH meter measures the electrical potential difference between a reference electrode and a glass electrode immersed in the water sample. The recommended pH range for drinking water is generally between...

difference-between-cod-bod-do-environmental-engineering

Difference Between COD, BOD and DO in Environmental Engineering In environmental engineering, the quality of water and wastewater is often evaluated using three important parameters: Dissolved Oxygen (DO) , Biochemical Oxygen Demand (BOD) , and Chemical Oxygen Demand (COD) . These parameters help engineers determine the level of pollution in water bodies and the amount of oxygen required to break down organic matter. 1. Dissolved Oxygen (DO) Dissolved Oxygen (DO) is the amount of oxygen dissolved in water. Aquatic organisms such as fish and microorganisms need dissolved oxygen to survive. DO is usually measured in mg/L (milligrams per liter) . Higher DO values indicate better water quality . Importance of DO Essential for aquatic life Indicates health of rivers and lakes Helps determine pollution level in water 2. Biochemical Oxygen Demand (BOD) Biochemical Oxygen Demand (BOD) is the amount of oxygen required by mic...

S.K. Garg Environmental Engineering Vol 1 Water Supply Engineering Book Overview

Environmental Engineering (Vol. I): Water Supply Engineering Environmental Engineering (Volume I): Water Supply Engineering is a well-known textbook written by S. K. Garg and published by Khanna Publishers . The book is widely used by civil engineering students and professionals for learning the fundamentals of water supply systems. About the Author S. K. Garg is a respected author in the field of civil and environmental engineering. His books are popular because they explain complex engineering concepts in a clear and easy-to-understand manner . Many universities recommend his books for civil engineering courses. About the Book This book focuses on the planning, design, and management of water supply systems . It explains how water is collected from natural sources, treated to make it safe, and distributed to cities and villages. The book contains detailed explanations, diagrams, and numerical problems that help students under...

MWH's Water Treatment Principles and Design 3rd Edition Book Overview

MWH’s Water Treatment: Principles and Design (3rd Edition) MWH’s Water Treatment: Principles and Design is one of the most comprehensive books on water treatment used by environmental and civil engineers worldwide. The book was written by John C. Crittenden, R. Rhodes Trussell, David W. Hand, Kerry J. Howe, and George Tchobanoglous and published by John Wiley & Sons, Inc. in 2012. About the Authors The authors are internationally recognized experts in the field of environmental engineering and water treatment . Their research and professional experience have contributed significantly to modern water treatment technologies. John C. Crittenden – Expert in water treatment and environmental systems. R. Rhodes Trussell – Specialist in water quality and treatment design. David W. Hand – Known for research in adsorption and water purification. Kerry J. Howe – Focuses on membrane filtration and advanced treatment processes. George Tchoba...

Environmental Engineering by Peavy Row and Tchobanoglous Book Overview

Environmental Engineering – Book Overview Environmental Engineering is a well-known textbook written by H.S. Peavy, D.R. Row, and George Tchobanoglous . The book is published by McGraw Hill Education and the 1st Indian Edition was released in 2017 . This book is widely used by civil engineering and environmental engineering students for understanding the principles of water supply, wastewater treatment, and pollution control. About the Authors H.S. Peavy – Expert in environmental and water resources engineering. D.R. Row – Known for contributions in environmental systems and pollution control. George Tchobanoglous – One of the most recognized authors in environmental engineering and wastewater treatment. About the Book The book provides a comprehensive introduction to environmental engineering concepts . It explains how engineers manage water resources, treat wastewater, and protect the environment from pollution. It is...

NPTEL Civil Engineering Courses with YouTube Lectures

NPTEL Courses for Civil Engineering Students (With YouTube Lectures) NPTEL (National Programme on Technology Enhanced Learning) provides free online courses from IITs and IISc for engineering students. Civil engineering students can study many subjects through video lectures, assignments and certification programs . Students can watch lectures on the official NPTEL website or on the NPTEL YouTube channel. Official NPTEL Website Visit the official website for all courses: https://nptel.ac.in/ NPTEL YouTube Channel Watch all NPTEL lectures on YouTube: https://www.youtube.com/c/nptelhrd Important Civil Engineering Subjects with NPTEL Lectures 1. Structural Engineering Course Link: Structural Engineering Courses YouTube Lectures: Watch Structural Engineering Lectures 2. Environmental Engineering Course Link: Environmental Engineering YouTube Lectures: Watch Environmental Engineering Lectures 3. Geote...

water-wastewater-physical-chemical-biological-characteristics-lab-experiment

Lab Activities: Determination of Physical, Chemical and Biological Characteristics of Water and Wastewater Water quality testing is an essential laboratory activity in environmental science and civil engineering. By analyzing the physical, chemical, and biological characteristics of water and wastewater , students and researchers can understand the level of pollution and determine whether water is safe for use. In this laboratory activity, we examine different parameters such as temperature, turbidity, pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), and microbial contamination. Aim of the Experiment To determine the physical, chemical, and biological characteristics of water and wastewater samples in order to evaluate water quality and environmental impact. Apparatus and Materials Required Thermometer Turbidity meter (Nephelometer) pH meter or pH strips Dissolved Oxygen (DO) bottle Incubator ...

optimum-dosage-of-coagulant-jar-test-experiment

Lab Experiment: Determination of Optimum Dosage of Coagulant (Jar Test) In water treatment plants, coagulation is an important process used to remove suspended particles and impurities from water. A chemical called a coagulant (such as alum) is added to the water to help small particles combine and form larger particles called flocs . These flocs settle down easily, making the water clearer. The purpose of this laboratory experiment is to determine the optimum dosage of coagulant required for effective water treatment. This is usually done using a method called the Jar Test . Aim of the Experiment To determine the optimum amount of coagulant required to treat a water sample using the jar test method. Apparatus and Materials Required Jar test apparatus (multiple stirrers) Beakers (500 mL or 1 L) Measuring cylinder Pipette Glass rod Turbidity meter Raw water sample Coagulant solution (usually Alum) Theory Raw water ...

break-point-chlorination-water-treatment-lab-experiment

Lab Experiment: Determination of Break-Point Chlorination Chlorination is one of the most common methods used for disinfection of drinking water . Chlorine is added to water to kill harmful microorganisms such as bacteria and viruses. However, the amount of chlorine added must be carefully controlled to ensure effective treatment. The point at which the chlorine demand of water is fully satisfied and free residual chlorine begins to appear is known as the break-point chlorination . Determining this point helps water treatment plants apply the correct chlorine dosage. Aim of the Experiment To determine the break-point chlorination of a water sample by adding different doses of chlorine and measuring the residual chlorine. Apparatus and Materials Required Water samples Beakers or conical flasks Measuring cylinder Pipette Chlorine solution (bleaching powder solution) Orthotolidine reagent or DPD reagent Comparator or colorimeter ...