Product Introduction

Flowing sandA filter is a continuous operation treatment equipment that integrates flocculation, clarification, filtration, and biological treatment functions, widely used in the fields of drinking water, industrial water, deep treatment of sewage, and reuse of reclaimed water. Continuous flow sand filter（Also known as activated sand filter, it adopts the principle of upflow fluidized bed filtration and a single homogeneous filter material, and can filter and wash sand simultaneously24Continuous automatic operation for hours, no need to stop and backwash. The clever sand lifting and washing structure replaces the traditional high-power backwash system, with extremely low energy consumption, no maintenance required, easy management, and unmanned operation.

Application scope

（1）Suitable for purifying slightly polluted water, it can treat surface water and water with low water quality requirements (such as cooling water);

（2）Suitable for the deep treatment of industrial water and wastewater, as well as the reuse of reclaimed water, it can be set up in conventional activated sludge process, delayed aeration process, etcSBRThe backend of the system, oxidation ditch system, drip filter system, and oxidation pond system.

Main functions:

◆ Remove total suspended particulate matter ◆ Remove ammonia nitrogen and nitrate nitrogen

◆ Add chemicals to remove total phosphorus ◆ Remove turbidity

Working principle

The operation of a sand flow filter can be divided into two relatively independent yet simultaneous processes: raw water filtration and filter material cleaning and regeneration. Both are in the same filterThe different positions are completed, with the former relying on high differential or pump lift for power, while the latter is accomplished through compressed air.

When the raw water flows naturally from the high-level tank or is pumped into the water distribution ring at the bottom of the filter, it gradually flows upward through the filter bed through the guide channel and conical distributor,The impurities in the raw water are continuously intercepted and adsorbed, and finally the purified water flows into the purified water tank from the overflow weir at the top of the filter, completing the filtration process.

As filtration continues, impurities in the raw water are constantly accumulated and trapped on the surface of the filter material, with the bottom filter material being the most polluted. Set up filteringThe compressed air sand extraction device at the top of the equipment first delivers this part of the filter material in batches and quantitatively to the three-phase (water, gas, and sand) separator at the top through a special material sand washing tubeIn the tall vessel, air is discharged, and water and sand enter the connected sand washing vessel for cleaning. The sand washing water is discharged through a separate pipeline, and the cleaned sand is redistributed throughout the entire vesselThe surface of the filter bed realizes the process of cleaning and circulating the filter material.

Product Features

1. Compact structure: This equipment integrates coagulation reaction, filtration, and continuous cleaning. Simplified water treatment process flow, small footprint, simple structure, and flexible and convenient installation. Reduced energy consumption and labor management costs in multiple stages of the raw water treatment process, and reduced operational difficulty.
2. The unique cleaning device only requires a small amount of cleaning water to achieve complete filter material cleaning effect.
3. Continuous self-cleaning filtration: The filter medium automatically circulates and cleans continuously without the need for shutdown for backwashing.
4. Reduce the suspended solids (SS) content in raw water: with the help of a micro flocculation device, various industrial water, urban domestic sewage, and industrial wastewater with an inflow of Ss ≤ mg/L can be treated
Using water as recycled water with a removal rate of ≥ 90%
5. Low operating costs, with only raw water pumps and air compressors consuming power. No backwashing equipment or structures such as fans, valves, flushing pumps, backwashing
pool
6. The special conical sand distributor evenly lowers the sand in the filter bed without clogging the filter layer, keeping the filter material in a clean state
Improved filtration efficiency

7. No need for primary filtration, able to withstand high concentration incoming water.

Technical Parameter