The working principle of shallow sand filter: from "physical screening" to "intelligent regeneration", the disintegration shallow sand filter (hereinafter referred to as "sand filter") is a precision equipment that uses the principle of physical filtration to remove suspended particles in water, and its core component is a multi-layer quartz sand filter material. Unlike traditional single-stage filtration equipment, the shallow sand filter enables an efficient and automated water treatment process through a "filter - backwash - regeneration" cycle mechanism. Filtration stage: micron-level impurity interception "precision screen" multi-layer filter material structure: hierarchical interception, efficiency multiplier sand filter tank is filled with multiple layers of different particle size quartz sand, usually divided into coarse sand layer (particle size 1-2mm), medium sand layer (0.5-1mm) and fine sand layer (0.3-0.5mm). When raw water flows from top to bottom, large particles of impurities (such as sand and rust) are first intercepted by the coarse sand layer, and then the middle layer and the fine layer gradually filter the finer suspended matter, and the final turbidity of the effluent can be reduced to ≤1NTU (turbidity unit), meeting the industrial water and municipal water supply standards. Flow rate control and flow pattern optimization equipment adopts the water distribution mode of "down water, up water" and the special water distributor to make the water flow evenly distributed and avoid the filter material disturbance caused by turbulence. The water flow speed is usually controlled at 8-15m/h to ensure a balance between filtration accuracy and flux. For example, Liffelt's products use CFD (computational fluid dynamics) simulations to optimize the flow channel design and improve filtration efficiency by more than 20%. Backwash stage: automatic "scrub" filter material "regeneration magic" intelligent pressure difference monitoring and backwash trigger When the filter material layer accumulates impurities, the flow resistance increases, and the pressure difference between the import and export reaches the set value (usually 0.05-0.1MPa), the PLC control system automatically starts the backwash procedure. This process requires no human intervention and enables all-day unattended operation.
** Backwashing process: three steps to achieve the filter material "brand new" ** 1. ** Combined air and water backflushing ** : compressed air (0.6-0.8MPa) first "loose" the filter material, so that the adhesion of impurities off; 2. ** high-speed water backwashing ** : reverse water flow (flow rate 30-40m/h) will be out of the filter tank, through the sewage outlet discharge; 3. ** Filter material settling reset ** : After the end of backwashing, the water flow slowly recovers, so that the filter material is naturally stratified according to the particle size, and the initial state is restored. The entire backwash cycle takes only 3-5 minutes, and the remaining units can continue to filter when a single device is backwashed, ensuring continuous water supply to the system. ** Water Saving and energy saving design ** Liffert's sand filter adopts "frequency conversion backwashing technology", which dynamically adjusts the backwashing strength according to real-time pressure difference, and saves water up to 30%. At the same time, the backwash pump and the compressed air system are equipped with energy efficiency optimization modules, which reduce energy consumption by 15% compared with traditional equipment. Henan Xinxiang Lifelte Filter Co., LTD., founded in 2008, is a national high-tech enterprise integrating research and development, manufacturing and service, focusing on water treatment and fluid filtration. With the core advantage of "smart, efficient and durable", its shallow sand filter products are widely used in the following scenarios: Technological advantage: innovation-driven differentiation competitiveness ** Modular design ** : The equipment adopts the "1+N" modular combination, and the processing capacity of a single unit can reach 50-200m³/h. Multiple units in parallel can build 10,000-ton water purification systems to meet the needs of different scales. ** Intelligent control system ** : Standard equipped with Siemens PLC+ touch screen control cabinet, support remote monitoring, fault diagnosis and data upload, optional Internet of things module access smart water platform. ** Corrosion-resistant material ** : The main body of the filter tank is made of 316L stainless steel or FRP composite material, with a bearing capacity of 1.6MPa and a service life of ≥20 years. Product series: Diversified application of the whole scene coverage ** Industrial series (LFS series) ** : Suitable for steel, chemical, electric power and other industries, filtration accuracy ≤5μm, withstand high temperature (≤80℃) and corrosive media; ** Municipal series (LFC series) ** : For waterworks and sewage treatment plants, integrated coagulant dosing and automatic sludge discharge function, the effluent meets the "Sanitary Standard for Drinking Water"; ** Swimming pool special series (LFP series) ** : Using food-grade filter material and UV sterilization module, circulating water turbidity can be stabilized within 0.2NTU. Case witness: Trusted choice of global customers ** Cooling water system of a large steel group ** : 20 sets of LFS-150 sand filters are deployed, saving 120,000 tons of water per year, and the equipment has been running for 5 years without failure; ** A municipal water supply renovation project ** : LCC-300 equipment reduced raw water turbidity from 20NTU to 0.5NTU, benefiting 300,000 residents; ** Swimming pool of a five-star hotel in Dubai ** : LFP series equipment can operate without water change throughout the year, saving 50% of operating costs. Why Liefert's shallow sand filters? 1. ** Performance dimension ** : filtration accuracy, backwash efficiency, corrosion resistance and other key indicators are better than industry standards; 2. ** Cost dimension ** : the initial investment is reduced by 30% compared with similar imported brands, and the operation and maintenance cost is saved by 25% due to intelligent and low energy consumption design; 3. ** Service dimension ** : Provide "turnkey engineering" services, including scheme design, installation and commissioning, training and lifelong maintenance, response speed ≤24 hours. Future outlook: Intelligent and green two-wheel drive With the integration of the Internet of Things and artificial intelligence technology, Liffert is developing a new generation of "AI adaptive sand filter", through machine learning to predict the backwash timing, optimize the filter material ratio, and further reduce energy consumption and labor costs. At the same time, the company actively expands the application of seawater desalination, zero emission and other fields to promote the sustainable development of water treatment technology. Shallow sand filter is not only the "goalkeeper" of water treatment system, but also the "accelerator" of water resource recycling. Henan Xinxiang Lifelte Filter Co., Ltd. takes technological innovation as the engine, infuses the concept of "intelligent, efficient and environmental protection" into every equipment, and provides safe and reliable water treatment solutions for global customers.
