The Four Stages of Anaerobic Reaction

NegotiableUpdate on 04/03

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

1. The purpose of the hydrolysis stage is to convert high molecular weight organic matter into small molecular weight organic matter. Due to the relatively large molecular weight of high molecular weight organic matter, it cannot penetrate the cell membrane and cannot be directly utilized by bacteria. Therefore, in the first stage, they are broken down into small molecules by bacterial extracellular enzymes. For example, cellulose is hydrolyzed by cellulase into disaccharides and glucose, starch is broken down by amylase into maltose and glucose, and protein is hydrolyzed by protease into short peptides and amino acids. The hydrolysis products of these small molecules can dissolve in water and be utilized by bacteria through the cell membrane. 2. The purpose of the acidification stage is to convert the small molecule organic compounds produced in the previous stage into volatile acids. In this stage, the above-mentioned small molecule compounds are transformed into simpler compounds inside the fermentation bacteria (i.e. acidification bacteria) and secreted outside the cells. The main products of this stage include volatile fatty acids (VFA), alcohols, lactic acid, carbon dioxide, hydrogen, ammonia, hydrogen sulfide, etc. At the same time, acidifying bacteria also utilize some substances to synthesize new cellular substances. Therefore, insufficiently acidified wastewater will produce more residual sludge during anaerobic treatment. 3. The purpose of the hydrogen and acetic acid production stage is to convert the products of acid producing bacteria into acetic acid, hydrogen, and carbon dioxide. At this stage, the products from the previous stage are further converted into acetic acid, hydrogen, carbonic acid, and new cellular substances. The main reactions are as follows: 4. Methanogenic bacteria can be divided into two populations during the methane production stage: acetolytic bacteria and hydrogenotrophic bacteria. During this stage, acetic acid, hydrogen, carbonic acid, formic acid, and methanol are converted into methane, di

Product Details

In daily operation, anaerobic reactors are one of the most important equipment in sewage systems. But do you understand the operating principle of anaerobic reactors? In fact, anaerobic reactions can be divided into four stages, namely hydrolysis, acidification, hydrogen production, acetic acid production, and methane production.

厌氧塔

1. Hydrolysis stage

Purpose: Conversion of high molecular weight organic compounds into small molecular weight organic compounds

Because the molecular weight of high molecular weight organic compounds is relatively large and cannot penetrate cell membranes, they cannot be directly utilized by bacteria. Therefore, in the first stage, they are broken down into small molecules by bacterial extracellular enzymes. For example, cellulose is hydrolyzed by cellulase into disaccharides and glucose, starch is broken down by amylase into maltose and glucose, and protein is hydrolyzed by protease into short peptides and amino acids. The hydrolysis products of these small molecules can dissolve in water and be utilized by bacteria through the cell membrane.

2. Acidification stage

Objective: To convert the small molecule organic compounds generated in the previous stage into volatile acids

At this stage, the small molecule compounds mentioned above are transformed into simpler compounds within the cells of fermenting bacteria (i.e. acidifying bacteria) and secreted outside the cells. The main products of this stage include volatile fatty acids (VFA), alcohols, lactic acid, carbon dioxide, hydrogen, ammonia, hydrogen sulfide, etc. At the same time, acidifying bacteria also utilize some substances to synthesize new cellular substances. Therefore, insufficiently acidified wastewater will produce more residual sludge during anaerobic treatment.

3. Hydrogen production and acetic acid production stage

Objective: The products of acid producing bacteria are converted into acetic acid, hydrogen, and carbon dioxide by acetic acid bacteria.

At this stage, the products from the previous stage are further converted into acetic acid, hydrogen, carbonic acid, and new cellular substances.

The main reactions are as follows:

4. Methane production stage

Methanogenic bacteria can be divided into two populations: acetolytic bacteria and hydrogenotrophic bacteria.

During this stage, acetic acid, hydrogen, carbonic acid, formic acid, and methanol are converted into methane, carbon dioxide, and new cellular substances.

The main reactions are as follows:

The above are the four basic stages of anaerobic reactions. Wastewater undergoes different reactions at each stage, ultimately achieving the goal of removing COD and producing biogas. During the operation of the anaerobic reactor, webmasters can gain a deeper understanding of the pH value and the control role of VFA in these four different reaction stages. By mastering the basic principles, they can better control and operate the anaerobic reactor.

This article is organized by anaerobic tower and does not represent the views of this website.