Sulfur autotrophic denitrification biological denitrification technology, as an important innovation in modern water treatment technology, is based on the principle of enzyme catalysis and achieves the goal of effectively removing nitrate nitrogen in low carbon-nitrogen ratio water bodies.
1. Technical Principle
Sulfur autotrophic denitrification biological denitrification technology is essentially a microbial mediated catalytic reaction. In this process, specific sulfur autotrophic denitrifying microorganisms, such as Thiobacillus denitrificans, reduce nitrate nitrogen in water bodies (NO3-N and NO2-N) to nitrogen (N2) under the action of inorganic carbon sources (such as CO2, HCO3- and CO32-) and electron donors (such as S, S-, S2-, S2O32-, Fe and Fe2+, etc.). The chemical equation of this process is: NO3+1.10S +0.40CO2+0.76H2O+0.08NH4+→0.5N2↑
+1.10SO42+1.28H++0.08C5H7O2N.
The design of the sulfur autotrophic denitrification reactor is the key to realizing this technology. Fillers need to be added to the reactor or a fixed bed reactor needs to be formed. These fillers not only provide a surface for the attachment and growth of sulfur autotrophic denitrifying bacteria, but also serve as electron donors and inorganic carbon source carriers. As the reaction proceeds, the fillers will be gradually consumed to support the growth of sulfur autotrophic denitrifying bacteria and the biochemical reaction.
2. Technical Application
Sulfur autotrophic denitrification biological denitrification technology has broad application prospects in the field of water treatment. First of all, this technology is particularly suitable for the treatment of low carbon-nitrogen ratio water bodies, such as urban sewage, industrial wastewater, etc. In these water bodies, due to insufficient organic carbon sources, traditional biological denitrification technologies often find it difficult to achieve ideal denitrification effects. The sulfur autotrophic denitrification technology can make full use of inorganic carbon sources and electron donors to achieve an efficient denitrification process.
Secondly, the sulfur autotrophic denitrification technology also has the advantages of simple operation, stable operation and low energy consumption. Compared with traditional physical or chemical denitrification methods, this technology does not require the addition of additional chemical agents, reducing the possibility of secondary pollution. At the same time, due to the catalytic action of microorganisms, the reaction process is carried out at normal temperature and pressure, reducing energy consumption and operating costs.
3. Technical Challenges
Although the sulfur autotrophic denitrification biological denitrification technology has many advantages, it still faces some challenges in practical application. First, the growth and activity of sulfur autotrophic denitrifying microorganisms are greatly affected by environmental conditions, such as temperature, pH value, dissolved oxygen concentration, etc. Therefore, these parameters need to be strictly controlled in practical applications to ensure the stability of the denitrification effect.
Secondly, the selection and dosage of fillers have an important influence on the performance and life of the reactor. Different filler materials, shapes and sizes will affect the attachment and growth of microorganisms, thereby affecting the denitrification effect. Therefore, factors such as biocompatibility, stability and economy need to be considered when selecting fillers.
In addition, sulfate (SO42-) produced during sulfur autotrophic denitrification may pose potential risks to the environment and organisms. Therefore, the discharge and treatment of sulfate need to be fully considered when designing and operating reactors.
In short, as a new type of biological denitrification technology, sulfur autotrophic denitrification biological denitrification technology has broad application prospects and huge development potential in the field of water treatment.
){kind=link}