Related Experiment Video
Updated: Dec 15, 2025
11:58
Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization
Published on: December 29, 2013
13.9K
Microbial network succession along a current gradient in a bio-electrochemical system
Minghan Zhu1, Zibo Jing2, Quan Zheng3
1Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
Bioresource Technology
|July 11, 2020
Summary
Low electrical currents enhance nutrient removal and microbial network complexity in biofilm reactors. High currents inhibit removal and simplify microbial interactions, impacting wastewater treatment performance.
Area of Science:
- Environmental Science
- Microbiology
- Electrochemistry
Background:
- Wastewater treatment relies on efficient nutrient removal.
- Biofilm-electrode reactors offer a promising approach for enhanced treatment.
- Understanding microbial dynamics under electrical gradients is crucial for optimization.
Purpose of the Study:
- To investigate the effect of varying electrical currents on a three-dimensional biofilm-electrode reactor (3DBER) coupled with a sulfur/iron system.
- To analyze the impact of current gradients on nutrient removal efficiency and microbial network structure.
Main Methods:
- A lab-scale three-dimensional biofilm-electrode reactor (3DBER) with a sulfur/iron (Fe/S) system was utilized.
- Molecular ecological network (MEN) analysis was employed to study microbial community dynamics.
- Nutrient removal (nitrogen and phosphorus) was monitored under different current conditions.
Main Results:
- Low currents (<100 mA) promoted nitrogen and phosphorus removal.
- High currents (≥100 mA) inhibited nutrient removal and decreased microbial network scale and complexity.
- Increased competition among Proteobacteria and Chloroflexi was observed at high currents.
- Electrical currents significantly altered interactions among denitrifying bacteria, with dynamic keystone species.
Conclusions:
- Electrical current gradients play a critical role in the performance of 3DBER-Fe/S systems.
- Optimizing current levels is essential for maximizing nutrient removal and maintaining beneficial microbial community structures.
- Microbial network analysis provides insights into the ecological responses to electrical stimulation in wastewater treatment.
Related Concept Videos
01:26What is an Electrochemical Gradient?
125.8K
Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
125.8K
01:28Microbial Nutrition
884
Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
884
01:21Electrochemical Gradient and Channel Proteins: An Overview
4.1K
An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
4.1K
01:29Electron Transport Chain Components
710
The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
710
02:17Ecological Succession
21.0K
Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
21.0K
01:15Metabolism of Chemolithotrophs
594
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
594