The significance and role of ultraviolet disinfection in water treatment With economic development and improved living standards, the government and the public are increasingly prioritizing drinking water safety. my country's drinking water quality standards have undergone several revisions in recent years. The latest "Standard for Drinking Water Quality" (GB 5749-2022) sets higher safety requirements for drinking water quality, particularly regarding disinfection byproducts and upper limits for residual chlorine, which pose certain challenges to traditional chlorine disinfection processes. Consequently, cities such as Shanghai, Shenzhen, Suzhou, and Fuzhou have also established more stringent targets or local standards for high-quality or premium drinking water. Ultraviolet disinfection, as a physical disinfection method, has become an important option for improving water supply safety under these new conditions due to its broad-spectrum bactericidal properties, the absence of chemical agents, and the generation of no disinfection byproducts.   Chlorine-resistant microorganisms may exist in drinking water. In addition to well-known chlorine-resistant microorganisms such as Giardia lamblia and Cryptosporidium, studies have shown that chlorine-resistant microorganisms such as Sphingomonas, Pseudomonas, Cereus, Acinetobacter haemolyticus, Bacillus fuscae, Bacillus alvei, Legionella, and Thiophages are commonly found in the outlet water and water supply networks of Chinese water plants. Some of these chlorine-resistant microorganisms are opportunistic pathogens. Effectively inactivating these chlorine-resistant microorganisms requires a significant increase in the CT value of chlorine, making chlorine disinfection uneconomical or even impossible to implement, and significantly increasing the risk of excessive disinfection byproducts. Strictly speaking, the traditional single-unit chlorine disinfection model presents a safety vulnerability. Once a chlorine disinfection unit fails, the water plant's microbial safety barrier is completely lost. Therefore, from the perspectives of biological and chemical safety, a multi-barrier disinfection strategy and concept is essential for improving water supply safety. This concept has now been widely accepted and practiced in urban water plants in North America and the European Union. Ultraviolet disinfection has become an indispensable and even a key part of the combined disinfection method because it can meet both biological and chemical safety requirements.   Current Application of Ultraviolet Disinfection in my country's Water Treatment In recent years, the multi-barrier disinfection concept and ultraviolet disinfection technology have gradually gained recognition and promotion in my country's water supply sector, with initial application in urban water plants. According to incomplete statistics, over 60 large-scale water plants in China currently employ ultraviolet disinfection processes, with a tr...

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The Datong Yudong Wastewater Treatment Plant Project Background   The Datong Yudong Wastewater Treatment Plant has a treatment capacity of 100,000 cubic meters per day. Its wastewater primarily consists of pharmaceutical wastewater and pharmaceutical intermediate wastewater, characterized by complex composition, high organic content, high toxicity, dark color, high salinity, and difficulty in degradation. After pre-treatment at the pharmaceutical plant, the residual effluent from upstream water primarily consists of difficult-to-biodegrade macromolecules and antibiotics, which exhibit significant bioinhibition, making it a typical example of difficult-to-biodegrade industrial wastewater.   The first phase of the project initially employed an ozone oxidation process, but after initial implementation, it did not achieve the desired treatment results. Subsequently, a fluidized bed Fenton process was adopted; the second phase will utilize a magnetic Fenton process.   Recently, the magnetic Fenton process section of the Datong Yudong Wastewater Treatment Plant renovation and expansion project, undertaken by Guangzhou Jinchuan, has successfully commenced operation.   The Phase 1 project used a fluidized bed Fenton system, which presented the following operational and maintenance challenges:   1. High reagent consumption;   2. High power consumption and failure rate of the reflux pump;   3. Regular packing replacement required;   4. The reactor was prone to clogging, requiring frequent unclogging of the water distributor within the tower, placing a heavy workload on on-site operators;   5. Long process chain: The Fenton effluent was approximately 47 mg/L, requiring subsequent sand and carbon filtration to achieve a final effluent below 40 mg/L;   6. Annual maintenance costs exceeded 2 million RMB;     The phase 2 project utilized a magnetic Fenton system. Compared to a fluidized bed Fenton system, this system eliminates the need for a reflux pump, reducing the number of pipes on site and keeping the floor clean and tidy. There is no need to overhaul the reflux pump, replace packing, or unclog the water distributor within the tower, preventing reactor compaction and blockage, significantly reducing the workload for on-site operators.   Jinchuan Super Cheap Magnetic Fenton: Technology from Germany   Fluidized bed Fenton: COD after biochemical treatment is mostly extremely difficult to degrade. Dissolved organic matter (DOD) is surrounded by a large number of water molecules, making it difficult for hydroxyl radicals to reach the COD. A saturation attack method is used to deoxidize the COD with H₂O₂ at concentrations several times the COD level. This results in extremely high H₂O₂ consumption. In actual projects, this results in high hydrogen peroxide dosages and the need for subsequent degassing tanks.   Super Cheap Magnetic Fenton Technology: Wastewater is first magnetized, alteri...

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How does drinking water get to your home?   As we all know, the water is playing the vital role to our life, it is the life fountainhead, is the humanity livelihood and one of the most important physical resources of development essential. But, do you know the water sources? Most of the water come from surface water sources (e.g. rivers or lakes) or ground water sources. (e.g. wells). Water from these sources is treated at water plant to remove impurities, reducing the risk of the transmission of water borne diseases. How do the water plant treat the water?   1.Raw water intake Water is pumped into the water plant by pump from the river or lake. When the water go through the large metal grills which called screens and trash racks, the large floating objects, aquatic animals or other pollutants are separated    2.Rapid Mixing At this stage, the chemicals Alum or Aluminum Sulphate (a coagulant), liquid polymer (a flocculant) is added to raw water, which is ensure rapid mixing and uniform distribution of the chemicals with the raw water. The Alum reacts rapidly with the water’s alkalinity to produce a gelatinous precipitate of Aluminum Hydroxide called microfloc that is injected into the tanks to remove particulate impurities from the water, such as non-settleable solids. The liquid polymer aids coagulation by enlarging the floc particles. Chlorine is added to prevent algae growth on the wall of the flocculation and sedimentation basins.   3.Flocculation After rapid mixing, the water flows into flocculation basins, where the flow of water is slowed and the floc has time to grow bigger. Sedimentation Next, the water flows into sedimentation basins where the water moves slowly, causing the heavier solids to settle to the bottom of the tank and the lighter materials to float. The settled solids are called sludge, and is piped to drying lagoons.   4.Filtration After leaving the sedimentation basin, the water flows through a filter designed to remove particles in the water. The filters are made of layers of sand and gravel, in order to remove dissolved particles, such as dust, parasites, bacteria, viruses, and chemicals.   5.Disinfection After the water is filtered, then chlorination step is used for killing any remaining parasites, bacteria, and viruses, and to protect the water from germs when it is piped to homes and businesses. The sodium hypochlorite generator is a type of water treatment disinfection device which uses salt as a raw material and produce a sodium hypochlorite solution by electrolytic reaction.   But, Why Choose Onsite Sodium Hypochlorite Generator?  -Safety     Safe Raw Material: only salt and water required; Safe Production: the concentration of NaClO less than 1% which is classified as a non-hazardous chemical -Low Running Cost To produce 1 kg available chlorine , only cost 3.5 kg of salt , 4 kwh of energy -Onsite Generation and dosing No chemical transportation and stora...

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