Fillers & Catalyst

Ozone oxidation catalytic technology is an efficient deep treatment method for wastewater and has become a hot topic in the field of sewage treatment in recent years. Compared to ozone used as a standalone oxidant, ozone in the presence of a catalyst forms hydroxyl radicals (·OH) that react with organic compounds at a higher rate and with stronger oxidation, allowing for the oxidation of almost all organic substances. The catalyst utilizes the strong oxidative properties of ozone to directly oxidize organic compounds in water into CO₂ and H₂O, or to decompose large organic molecules into smaller ones, making them easier to degrade.

This series of catalysts is a multi-component catalytic oxidation catalyst developed to address the challenges of difficult-to-degrade and poorly biodegradable organic wastewater. It has obtained a national invention patent as a new type of micro-electrolysis catalyst in China. It is produced by combining multi-metal alloy catalysts using high-temperature microporous activation technology and belongs to the new type of dosing, non-caking micro-electrolysis catalysts. When applied to wastewater, it efficiently removes COD, reduces color, improves biodegradability, and ensures stable and long-lasting treatment effects, while also preventing issues such as catalyst passivation and caking during operation

The new type of micro-electrolysis filler (iron-carbon filler) is sintered at a high temperature of around 1300°C. It features an integrated iron-carbon structure, fused catalyst, microporous framework alloy structure, large specific surface area, high activity, and high current density. It can efficiently remove COD, reduce color, and improve biodegradability, providing stable and long-lasting treatment effects while preventing issues such as filler passivation and caking during operation. Compared to modified iron particles used in steel pelletization available on the market, this product’s treatment efficiency is more than doubled.

In a heterogeneous Fenton system, metal catalysts fixed on a solid phase surface are used instead of the traditional Fe²⁺ in Fenton reactions to activate H₂O₂ and generate hydroxyl radicals (·OH) for pollutant removal. High-valent metals at the solid-liquid interface are reduced to low-valent states by H₂O₂, enabling the recycling of the catalyst and ensuring the continuous progress of the reaction (see equations 1-3).

≡Mn+ + H2O2 → ≡M(n+1)+ +·OH + OH－  （1）
≡M(n+1)+ +H2O2 → ≡Mn+ + H2O·+ H+    （2）
H2O·+ ≡M(n+1)→ ≡Mn+ + H+ + O2           （3）

Compared to traditional Fenton reactions, heterogeneous Fenton technology significantly broadens the applicable pH range, avoids the production of iron sludge, and allows for the reuse of the catalyst.

High-entropy alloys have attracted the attention of materials researchers due to their unique "four effects"—high-entropy effect, lattice distortion effect, sluggish diffusion effect, and "cocktail" effect. Compared to traditional catalytic materials composed of 2 or 3 metal elements, high-entropy alloys not only exhibit superior physical, chemical, surface, and electromagnetic properties but also offer higher catalytic stability. By adjusting the content of each element according to the catalytic performance requirements, high-performance catalytic alloy materials can be achieved.

Diamonds offer numerous advantages, including high hardness, high thermal conductivity, high stability, corrosion resistance, and good biocompatibility. 

BDD (Boron-Doped Diamond) electrode plates have significant advantages in the field of electrochemistry, such as a wide potential window, low background current, and high electrochemical stability. They are widely recognized as one of the most promising and excellent electrode materials in electrochemistry.

Titanium anodes, formally known as titanium-based mixed metal oxide (MMO) coated anodes, are also referred to as DSA (Dimensionally Stable Anode) anodes. They are made with titanium as the base material (in forms such as wires, rods, tubes, plates, or meshes), and a precious metal coating is applied to the titanium substrate. This coating endows the anode with excellent electrocatalytic activity, electrical conductivity, and resistance to oxidation.

The company offers a diverse product range and serves a wide array of fields. Major products include:

1. Ruthenium-based titanium metal oxide anodes
2. Iridium-based titanium metal oxide anodes
3. Platinum-based titanium precious metal-coated anodes
4. Complete electrochemical equipment

These products have been successfully applied in various industries such as:

Chloralkali production
Chlorate/perchlorate production
Electrolytic extraction of non-ferrous metals
Hypochlorite generators
Electroplating
Electrodialysis
Organic electrolysis
Cathodic protection
Organic wastewater treatment

"This catalytic oxidation technology, as a type of Fenton-like process, operates under the same conditions as conventional Fenton processes. However, it replaces the ferrous sulfate used in traditional Fenton reactions with nano-sized catalysts (LAT-NMF). This approach not only reduces the amount of iron introduced into the water treatment system and decreases the volume of solid waste but also minimizes the introduction of sulfate ions, thus reducing the increase in salt content.

The catalyst product developed by your company is based on the nano-sized LAT-NMF catalyst system. It offers advantages such as high density and easy separation, strong catalytic effects, and high catalytic efficiency, which significantly enhance the utilization of hydrogen peroxide. Additionally, because it uses a smaller amount of catalyst compared to conventional Fenton processes, it greatly reduces solid waste production. This makes it a high-efficiency, low-secondary-product, and environmentally friendly advanced oxidation technology."

The core of the autotrophic denitrification technology is the Fe-S coupling biological carrier independently developed by Longantai. This biological carrier consists of Fe-S nanocores and alkalinity loading, offering a large specific surface area and high efficiency.

Operation principle: In anoxic environments, denitrifying bacteria use Fe-S nanocores as electron donors and nitrate (NO₃⁻), nitrite (NO₂⁻), and other nitro pollutants as electron acceptors. Inorganic carbon sources (CO₂, HCO₃⁻, CO₃²⁻) are utilized for metabolic carbon, converting pollutants such as NO₃⁻ and NO₂⁻ in the wastewater into N₂.

The alkalinity loading is evenly distributed within the pores of the coupling biological carrier, forming a synergistic mechanism with the Fe-S nanocores. This effectively balances the pH of the denitrification process, maintaining the alkalinity activity in the water environment.

The Fe-S nanocores also promote the metabolic coupling of microorganisms, leading to self-activation of the denitrification reaction process, achieving efficient, continuous, and stable denitrification.

The conventional fluoride removal using activated alumina takes advantage of its excellent adsorption properties, which are attributed to the unique structure of activated alumina. The number of oxygen ions in the second layer of activated alumina is double that of the first layer, and these oxygen ions are connected to aluminum ions. As a result, aluminum ions are exposed on the surface, enabling them to bond with fluoride ions (F—), thereby achieving fluoride removal.

The fluoride removal filler developed by your company for fluorine-containing wastewater is based on conventional activated alumina. It undergoes modification with a specific modifier and then a secondary calcination activation. During the modification process, the water molecules adsorbed by the alumina form hydroxyl groups with varying activity levels. The calcination activation step enhances the active sites between the hydroxyl groups and metal ions, thereby improving the fluoride removal capability of the adsorbent.

The presence of phosphorus is one of the main causes of water body eutrophication. Although the pollutant concentrations in urban non-point source wastewater and agricultural non-point source wastewater are relatively low, they still fall within the category of wastewater and have a significant impact on natural water bodies like rivers and lakes. For the advanced treatment of such wastewater, using simple, effective, and low-cost processes to further enhance phosphorus removal capacity is crucial. Improving the total phosphorus index in these low-pollution waters to surface water class III, or even class II, is of great importance for protecting the water quality of rivers and lakes.

The phosphorus removal filler independently developed by Longantai features a porous network structure. By incorporating specialized nano-active components, it increases the number of active adsorption sites for phosphorus and slowly releases functional ions. These ions react with phosphorus to form harmless phosphate precipitates, achieving efficient phosphorus removal. Additionally, the filler can also serve as a growth medium for microorganisms, enabling synergistic biological/chemical phosphorus removal.

The CO removal catalyst primarily works based on the adsorption of reactants on the catalyst and surface chemical reactions. In the CO oxidation reaction, CO is adsorbed on the surface of the catalyst and reacts with oxygen molecules on the surface to form CO₂ and water, among other harmless substances. The efficiency of CO removal is significantly improved through the action of the catalyst.

A desulfurization agent is a chemical additive used to remove SO₂ and H₂S gases from combustion exhaust gases. During the desulfurization process, the desulfurization agent reacts chemically with sulfur compounds, converting them into harmless substances, thereby achieving the goal of purifying the exhaust gases.

Desulfurization agents are widely used in industries such as coal, chemical, and power generation. They play a crucial role in protecting the environment and human health, making them indispensable in these industries. For example, in chemical production processes, certain methods can generate large amounts of harmful gases like SO₂. Desulfurization agents are used to remove these harmful gases, thereby protecting the production environment and ensuring the health of employees.