Related Experiment Video
Updated: Jan 20, 2026
21:02
Investigating the Microbial Community in the Termite Hindgut - Interview
Published on: May 28, 2007
11.2K
Effect of Zn Addition on the Cd-Containing Anaerobic Fermentation Process: Biodegradation and Microbial Communities
Yonglan Tian1, Huayong Zhang2, Lei Zheng1
1Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China.
Summary
Adding zinc (Zn) to cadmium (Cd)-contaminated biomass during anaerobic fermentation boosts biogas production. This strategy improves process stability and lignocellulose biodegradation, enhancing biowaste utilization.
Area of Science:
- Environmental Science
- Biotechnology
- Waste Management
Background:
- Anaerobic fermentation offers a cost-effective method for biomass waste disposal.
- Heavy metals in biomass can negatively impact anaerobic fermentation efficiency and biowaste utilization.
- Understanding metal interactions is crucial for optimizing biowaste treatment.
Purpose of the Study:
- To investigate the effects of cadmium (Cd) and zinc (Zn) on anaerobic fermentation of biowaste.
- To determine how Zn addition influences biogas production, process stability, and substrate degradation in Cd-contaminated systems.
- To elucidate the microbial mechanisms underlying enhanced fermentation efficiency.
Main Methods:
- Controlled addition of Cd and Zn to biomass undergoing anaerobic fermentation.
- Monitoring of biogas yields, process parameters (e.g., COD, NH4+-N), and enzyme activities.
- Analysis of substrate biodegradation, particularly lignocelluloses.
- Assessment of microbial community structure and abundance (e.g., Methanothermobacter).
Main Results:
- Co-addition of Cd and Zn (Cd+Zn) increased daily and cumulative biogas yields compared to Cd alone.
- Zn addition improved process stability, reduced Chemical Oxygen Demand (COD), and enhanced lignocellulose biodegradability.
- Zn promoted coenzyme M activity and increased the abundance of Methanothermobacter, a key microorganism in lignocellulose degradation.
Conclusions:
- Appropriate Zn addition can mitigate the negative effects of Cd contamination in anaerobic fermentation.
- Zn enhances biogas yields and biowaste utilization by improving process stability and microbial activity.
- This study demonstrates a viable strategy for treating metal-contaminated biowaste via anaerobic digestion.
Related Concept Videos
01:23Microbial Fermentation
1.4K
Fermentation is a crucial anaerobic metabolic process that enables microbes to derive energy from sugar without relying on oxygen or an electron transport chain. This process is fundamental to various biological and industrial applications and is classified based on the metabolic products generated.Role of Pyruvate in FermentationPyruvate and its derivatives serve as key electron acceptors in fermentative pathways. The oxidation of NADH to regenerate NAD+ is essential for the continuation of...
1.4K
01:29Fermentation
128.8K
Most eukaryotic organisms require oxygen to survive and function adequately. Such organisms produce large amounts of energy during aerobic respiration by metabolizing glucose and oxygen into carbon dioxide and water. However, most eukaryotes can generate some energy in the absence of oxygen by anaerobic metabolism.
Fermentation is a type of metabolic process that occurs in the absence of oxygen, where organic molecules such as glucose are broken down to produce energy. During this process, the...
Fermentation is a type of metabolic process that occurs in the absence of oxygen, where organic molecules such as glucose are broken down to produce energy. During this process, the...
128.8K
01:28Gene Regulation in Microbial Communities: Quorum Sensing
537
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
537
00:30What are Populations and Communities?
37.2K
Overview
37.2K
01:27Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)
4.2K
α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are...
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are...
4.2K
01:08Conjugate Addition of Enolates: Michael Addition
3.4K
The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions.
3.4K