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Related Concept Videos

Testing Water Quality01:14

Testing Water Quality

440
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...
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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Quality of Water01:19

Quality of Water

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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...
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Related Experiment Video

Updated: Mar 18, 2026

Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
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Published on: September 26, 2016

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A review on sludge dewatering indices.

Vu Hien Phuong To1, Tien Vinh Nguyen1, Saravanamuth Vigneswaran1

  • 1Faculty of Engineering and IT, University of Technology, Sydney (UTS), PO Box 123, Broadway, NSW 2007, Australia

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|July 9, 2016
PubMed
Summary

Improving sludge dewatering is crucial for managing sewage treatment byproducts. A new modified centrifugal index effectively predicts final cake solids content and simulates dewatering processes.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Solid Waste Management

Background:

  • Annual generation of large volumes of residual sludge from sewage treatment plants presents significant management challenges.
  • Improving sludge dewatering efficiency is essential for reducing sludge management and transport costs.
  • Accurate indices are needed to evaluate sludge dewaterability, which is complicated by sludge complexity and diverse separation methods.

Purpose of the Study:

  • To review the challenges in assessing sludge dewatering performance.
  • To compare and discuss existing techniques for evaluating dewatering performance.
  • To propose a novel index for predicting dewatering outcomes.

Main Methods:

  • Literature review of sludge dewatering challenges and assessment techniques.
  • Comparative analysis of traditional dewatering indices and their limitations.
  • Introduction and validation of a new dewatering index: the modified centrifugal index.

Main Results:

  • Traditional dewatering indices often fail to accurately predict maximum achievable cake solids content.
  • The modified centrifugal index demonstrates suitability for estimating final cake solids content.
  • The proposed index effectively simulates prototype sludge dewatering processes.

Conclusions:

  • Assessing sludge dewaterability is complex, necessitating improved evaluation methods.
  • The modified centrifugal index offers a reliable approach for predicting dewatering efficiency.
  • This new index can aid in optimizing full-scale sludge dewatering operations.