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Related Concept Videos

Coagulation01:06

Coagulation

1.5K
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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Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

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Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
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Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

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Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
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Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia

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Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
When dissolved in liquid ammonia, an alkali metal, such as sodium,...
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Bioremediation00:46

Bioremediation

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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Factors Affecting Solubility04:01

Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Related Experiment Video

Updated: Feb 23, 2026

Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
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Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge

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Chemically reduced excess sludge production in the activated sludge process.

Yu Liu1

  • 1Environmental Engineering Research Centre, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. cyliu@ntu.edu.sg

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|March 27, 2003
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Summary

Excess sludge from wastewater treatment can be significantly reduced using chemical oxidation and metabolic uncoupling techniques. These methods offer environmentally sound solutions for minimizing sludge production without impacting treatment efficiency.

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Microbiology

Background:

  • Excess sludge generation is a major challenge in wastewater biological treatment.
  • Sludge disposal regulations are becoming increasingly stringent, necessitating reduction strategies.
  • Current disposal methods face environmental and economic limitations.

Purpose of the Study:

  • To review novel chemical-assisted sludge reduction technologies.
  • To evaluate the effectiveness of various sludge reduction methods.
  • To identify environmentally and economically acceptable solutions for sludge minimization.

Main Methods:

  • Review of chemical oxidation techniques (e.g., alkaline-thermal, ozonation, chlorination).
  • Analysis of metabolic uncoupling strategies.
  • Examination of high dissolved oxygen activated sludge processes.

Main Results:

  • Chemical-assisted processes can reduce excess sludge production by up to 100%.
  • These methods maintain process efficiency and stability.
  • Various chemical oxidation and metabolic uncoupling approaches show promise.

Conclusions:

  • Chemical-assisted sludge reduction is a viable strategy for wastewater treatment.
  • These techniques offer promising environmentally and economically acceptable solutions.
  • Further research can optimize these methods for widespread application.