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Related Concept Videos

Quality of Water01:19

Quality of Water

In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
Microbial Wastewater Treatment01:30

Microbial Wastewater Treatment

Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
Testing Water Quality01:14

Testing Water Quality

When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
States of Water01:23

States of Water

Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Sources of Food Contamination01:29

Sources of Food Contamination

Contamination of food by microbial agents and natural toxins poses significant risks to public health. These hazards can be introduced at various points across the food supply chain, ranging from environmental sources to processing and storage stages. Understanding these contamination pathways is critical for developing strategies to ensure food safety.Seafood is particularly vulnerable to contamination through both environmental exposure and microbial colonization. Toxins from harmful algal...
Disorder of Water Balance01:29

Disorder of Water Balance

Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...

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Related Experiment Video

Updated: Jul 6, 2026

Construction of a Low-cost Mobile Incubator for Field and Laboratory Use
07:50

Construction of a Low-cost Mobile Incubator for Field and Laboratory Use

Published on: March 19, 2019

Drinking-water safety: challenges for community-managed systems.

S Rizak1, Steve E Hrudey

  • 1Department of Epidemiology and Preventive Medicine and Cooperative Research Centre for Water Quality and Treatment, Monash University, Central and Eastern Clinical School, Alfred Hospital, Melbourne, VIC, Australia. samantha.rizak@med.monash.edu.au

Journal of Water and Health
|April 11, 2008
PubMed
Summary
This summary is machine-generated.

Drinking water suppliers must understand that system changes and severe weather events increase waterborne disease risks. Vigilance and competence are key to preventing contamination and ensuring safe drinking water for communities.

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Area of Science:

  • Environmental Science
  • Public Health
  • Water Quality Management

Background:

  • Waterborne disease outbreaks pose significant public health risks.
  • Historical data reveals recurring patterns linked to drinking water system vulnerabilities.

Purpose of the Study:

  • To identify key risk factors and failure modes associated with waterborne disease outbreaks.
  • To inform drinking water suppliers on preventing contamination events.

Main Methods:

  • A targeted review of documented waterborne disease outbreaks over several decades.
  • Analysis of outbreak-associated conditions and contributing factors.

Main Results:

  • Outbreaks are frequently linked to significant changes in water system conditions.
  • Severe weather events (heavy rainfall, snowmelt runoff) and treatment/system modifications are common risk factors.
  • Failure to recognize warning signs and complacency contribute to unsafe drinking water.

Conclusions:

  • Drinking water suppliers need competence and vigilance to maintain multiple barriers against contamination.
  • Understanding outbreak risks and failure modes is essential for managing community water supplies and ensuring consumer safety.