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Related Concept Videos

Reabsorption and Secretion in the DCT and Collecting Duct01:26

Reabsorption and Secretion in the DCT and Collecting Duct

The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
The distal part of the DCT, along with the...
Filtration and Urine Formation01:32

Filtration and Urine Formation

The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
Coagulation01:06

Coagulation

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...
Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
Capillary Exchange01:28

Capillary Exchange

The cardiovascular system's chief role is to disseminate gases, nutrients, waste, and other substances to the body's cells. Small molecules like gases, lipids, and lipid-soluble substances directly diffuse through capillary wall endothelial cell membranes. Glucose, amino acids, and ions, including sodium, potassium, calcium, and chloride, use transporters for facilitated diffusion via membrane-specific channels. Glucose, ions, and bigger molecules may also pass through intercellular clefts.
Reabsorption and Secretion in the PCT01:28

Reabsorption and Secretion in the PCT

The Proximal Convoluted Tubule, or PCT, plays a pivotal role in the body's filtration system. They are primarily responsible for reabsorbing solutes and water from the filtered fluid produced by the glomeruli. Most of the filtered water, ions, and organic solutes such as glucose and amino acids are reabsorbed by the PCT.
Transport mechanisms involving sodium ions (Na+) contribute significantly to solute reabsorption. These mechanisms include symport and antiport processes.
A key example is the...

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The C-seal: A Biofragmentable Drain Protecting the Stapled Colorectal Anastomosis from Leakage
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The C-seal: A Biofragmentable Drain Protecting the Stapled Colorectal Anastomosis from Leakage

Published on: November 4, 2010

Sewer exfiltration and the colmation layer.

J B Ellis1, D M Revitt, J Vollertsen

  • 1Urban Pollution Research Centre, Middlesex University, The Burroughs, Hendon NW4 4BT, UK. B.Ellis@mdx.ac.uk

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|June 5, 2009
PubMed
Summary
This summary is machine-generated.

Sewer exfiltration rates rapidly decline to a steady state, with measured losses significantly exceeding indirect estimates. Clogging layers and flow dynamics, not just pressure, influence leakage.

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Area of Science:

  • Environmental Engineering
  • Wastewater Systems
  • Fluid Dynamics

Background:

  • Sewer exfiltration rates exhibit significant variability, impacting environmental assessments and infrastructure management.
  • Existing indirect monitoring and modeling studies provide loss rate estimates that conflict with direct measurements.
  • Understanding the mechanisms governing sewer leakage is crucial for accurate environmental impact and risk assessments.

Purpose of the Study:

  • To quantify sewer exfiltration rates using sewer rig studies and compare them with indirect monitoring data.
  • To clarify definitions and evaluate the role of internal clogging layers (colmation, transition, bridging, biofilm) on exfiltration.
  • To assess the influence of flow variability and turbulence on leakage dynamics and challenge assumptions about rupture triggers.

Main Methods:

  • Direct measurement of exfiltration rates using sewer rig studies under controlled conditions.
  • Analysis of clogging layer characteristics and their hydraulic and matrix potential effects.
  • Assessment of flow and turbulence dynamics to determine critical leakage conditions.

Main Results:

  • Sewer rig studies showed rapid exponential decline in exfiltration rates to a steady-state equilibrium (10^-3 - 10^-6 L s^-1).
  • Measured daily average loss rates per standardized leak area and sewer length were significantly higher than indirect estimates.
  • Clogging layers and flow instability were identified as critical factors influencing exfiltration, challenging the sole reliance on head pressure.

Conclusions:

  • Direct sewer rig measurements reveal substantially higher exfiltration rates than previously estimated by indirect methods.
  • Clogging layers and dynamic flow conditions play a significant role in controlling sewer leakage, independent of pressure alone.
  • The findings necessitate a revision of current models and assumptions regarding sewer integrity and exfiltration.