Continuous flow sand filter

Model and material
       The continuous flow sand filter can be installed independently or as a filter component in the cement pool.
       独立安装过滤时，它由Filter pool及内部构件组成。内部构件包含供水管道，供水分配器，空气提升泵和洗砂装置。
       Filter pool通过法兰连接进水，滤液和清洗用水。采用标准的建筑用不锈钢或玻璃钢：其他选件依据具体需要提供。
       Filtration equipment can operate as a single filter or multiple filters in parallel to meet filtration needs:
       High-power continuous flow sand filtration equipment usually consists of filter components and is built in a cement tank. The filter assembly consists of a stainless steel or fiberglass conical bottom and internal components. Which method of cement tank or independent filtration is more economical depends on the actual filtration scheme and specific conditions:
       When this type of filter is installed, all filter units (each unit is composed of multiple filter components) share a sand bed: a set of equipment essentially has no filter area limit, so the continuous flow sand filter can be used in large water plants and sewage treatment plants that treat water equivalent to100.000or more people.
       Continuous flow sand filters are available in a variety of models, sizes and materials.
Process flow and application
       Continuous flowing sand filter is used to solve the problems of drinking water treatment, industrial water supply, water recycling and wastewater treatment before discharge. It is targeted at the user groups of utilities, pulp and paper industry, chemical, pharmaceutical, mining, food, power generation, incineration, metal finishing, electroplating and other industries that use and treat water.
       Continuous contact filtration method
       Continuous contact filtration is used to produce river and lake water into industrial water or drinking water, and is also used for wastewater treatment: flocculation chemicals are added to the continuous flow sand filter inlet water, and the front of the filter bed serves as a reaction medium to provide good conditions for the rapid formation of flocs without the need for a flocculation tank. And because continuous flow sand filters have the ability to handle high concentrations of suspended solids, wastewater does not require pre-settlement.
       Process water recycling reduces water consumption and enables comprehensive control of water quality. The used process water that has been screened and pre-settled is pumped into the continuous flow sand filter, and the filtered water is recycled. The sand washing water is flocculated and thickened, and the water overflowing from the concentration device is returned to the filter.
       The three-stage filtration method is used for final treatment before wastewater discharge. If necessary, the contact filtration method can be used, and aluminum or iron salts are used as flocculants to precipitate phosphorus and enhance the removal of suspended solids.
       The treatment results can meet the high environmental protection standards of municipal and industrial wastewater treatment.
       The filtration process is also used in conjunction with biological denitrification, where nitrate is converted into nitrogen gas by an active bacterial layer on the filter particles.
       Treatment of metal-containing industrial wastewater, including metal ion precipitation and flocculation, sedimentation and filtration in continuous sand filters. This process results in low metal residue.
       The filter media is ordinary graded quartz sand, only bioactive filters use special raw materials. Activated carbon filters are a special form of using activated carbon as the media.
       Continuous flowing sand filter is flexible and convenient, suitable for various needs。