On June 13, 2023, Anlis Environmental Technology Co., Ltd. (ANLIS) was awarded a national invention patent by the State Intellectual Property Office for its independently developed and designed "Photocatalytic Integrated Device for Promoting the Fenton Reaction." This follows the patents for "Ultra-High Concentration Plate-Type Ozone Generator" and "Photocatalytic Reflux Enhanced Oxidation System for Refractory Wastewater Treatment" received late last year.
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Photo-Fenton
Brief Introduction of Photo-Fenton Advanced Oxidation Process
(1) Technical process name:
Photo-Fenton advanced oxidation process
(2) Technical process principle:
Photo-Fenton technology introduces a 100-700nm light source on the basis of the traditional Fenton method. Under the excitation of high-intensity photons, Fe3+ and its complexes can be converted back into Fe2+, realizing a continuous Fe2+/Fe3+ cycle. The Fe2+ produced by photoreduction continues to react with H₂O₂, increasing the •OH yield and accelerating the decomposition of organic matter.
In addition, there is a synergistic effect between ultraviolet light and Fe2+ on the catalytic decomposition of H₂O₂, that is, the decomposition rate of H₂O₂ is much greater than the simple sum of the decomposition rates of H₂O₂ catalyzed by Fe2+ or ultraviolet light; at the same time, organic matter in sewage that can absorb photons becomes more active after absorbing photons and is more likely to participate in the reaction and be removed.
(3) Technical process characteristics:
① The degradation efficiency of the photo-Fenton method is higher, because the accumulation of substances such as Fe3+ in the traditional Fenton method will continuously trigger side reactions and hinder its own forward reaction;
② Fe3+ and Fe2+ can maintain a good cyclic reaction, which improves the efficiency of the traditional Fenton reagent;
③ UV light and Fe2+ have a synergistic effect on the catalytic decomposition of H₂O₂, which is mainly due to the fact that certain hydroxyl complexes of iron can undergo photosensitization reaction to generate •OH;
④ Make the mineralization degree of organic matter more complete;
⑤ The most mature and efficient photo-Fenton method is UV-Fenton, and organic matter can be partially degraded under the action of ultraviolet light;
⑥ It can greatly improve the utilization rate of iron ions, with a reuse rate of more than 80%. The amount of iron salt added and the sludge output are both reduced compared with traditional Fenton, saving operating costs;
⑦ The photo-Fenton process requires less iron salt and hydrogen peroxide dosage, resulting in lower operating costs.
⑧ Industrial Applications: Pretreatment and advanced treatment of industrial wastewater and industrial park wastewater, with zero-emissions.
Ozone photocatalytic advanced oxidation
Brief Introduction of Ozone Photocatalytic Advanced Oxidation Process
(1) Technical process name:
MPUV/H₂O₂/O3 ozone photocatalytic advanced oxidation process
(2) Technical process principle:
This method uses the high-intensity and high-energy ultraviolet rays emitted by MPUV to stimulate H₂O₂ and O3 to produce hydroxyl radicals with extremely strong oxidizing properties. Hydroxyl radicals can oxidize difficult-to-degrade organic matter and undergo various reactions such as hydrogen abstraction, addition or electron transfer, which can effectively reduce COD without causing secondary pollution and requiring no subsequent treatment. At the same time, organic matter in sewage that can absorb photons becomes more active after absorbing photons and is more likely to participate in the reaction and be removed.
(3) Technical process characteristics:
Green, clean and environmentally friendly, no by-products, mild reaction conditions, no secondary pollution, low energy consumption, simple operation and maintenance, and a wide range of applications. It can completely decompose many difficult-to-degrade organic matter into basically harmless simple compounds.
Application industry: Pre-treatment and deep treatment of industrial wastewater and industrial park wastewater, zero discharge.
Case Introduction
Cangzhou Lingang Development Zone 30,000 tons/day sewage treatment plant project
The national-level Cangzhou Bohai New Area Lingang Economic and Technological Development Zone, primarily focused on fine chemicals and biopharmaceuticals, has formed a consortium to undertake the Beijing Biopharmaceutical Industry Relocation Project. It has now formed a four-in-one industrial ecosystem encompassing high-end APIs and intermediates, pharmaceutical preparations, modern Chinese medicine, and related pharmaceutical industries. The original domestic sewage treatment plant, which received the industrial park's wastewater, was unable to cope with the volume and quality impacts, leading to the construction of the industrial park's wastewater treatment plant.
After pretreatment by industrial enterprises in the park, wastewater entering the wastewater treatment plant has extremely poor biodegradability and potential biotoxicity. Conventional processes were unable to meet standards. After extensive research, a process route of "pretreatment + magnetic coagulation + ozone catalytic oxidation + aerated biological filter + photo-Fenton advanced oxidation + filter cloth filter + nitrification and denitrification + ozone photocatalytic oxidation" was ultimately selected to ensure consistent effluent quality. The photo-Fenton advanced oxidation system is the largest example of a Photo-Fenton engineering application in China.
Ozone photocatalytic advanced oxidation process section
This project utilizes green and efficient photo-Fenton and ozone photocatalytic advanced oxidation processes. Implementation will effectively ensure compliance with wastewater discharge standards in the industrial park, while also reducing secondary pollution and achieving energy conservation and consumption reduction. The project's core processes, including photo-Fenton and photocatalytic advanced oxidation processes, ensure that the effluent meets the Class V surface water discharge standard of the "Surface Water Environmental Quality Standard" (GB3838-2002), with COD ≤ 40mg/L and TN ≤ 10mg/L.
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Upon completion and operation, the project will contribute significantly to the development zone's water pollution control and water environment protection, infrastructure development, and sustainable economic development. It will improve the zone's investment attraction environment while also comprehensively managing wastewater discharged from the development zone, ensuring that wastewater meets discharge standards. This will ensure both governance and development, resulting in a win-win situation for both environmental and economic benefits.
Municipal Wastewater
Municipal water supply
Recycled Water Reuse
Township water supply and drainage
Industrial Park
New pollutant control
Water ecological restoration project
