WHAT IS SAND FILTER IN RO PLANTS?
The removal of suspended materials, as well as floating and sinkable particles, is accomplished through sand filtration. The wastewater is gravity-fed vertically through a fine sand and/or gravel bed. Absorption or physical encapsulation are used to eliminate particles. The filter must be rinsed if there is severe pressure loss. There are two types of filters: continuous and discontinuous. The dirty sand is continually removed, washed, and re-used in continuous filters (typically upward-flowing filters) without halting the filtration process. Filters that are not continuous (typically downward-flowing filters) are turned off, and a rinse is performed in the opposite direction.
To make the sand bed swirl, air bubbles are blown into it. Filtered water then travels in the opposite direction through the filter bed. The dirty substance is expelled, and the rinse water runs away with it. After then, the filtration process can resume.Two sand filter functions, surface filtration and depth filtration, determine the yield of a sand filter. The particles are collected above the filter bed in surface filtering. These particles come together to form a macro-porous mass that can effectively capture fresh particles.
MATERIALS FILTERED BY SAND
Your sand filter will capture a wide range of materials. The sand in your sand filter will capture small particles between 20 and 100 microns in size.
APPLICATIONS:
1- Aeration and sand filtration are used to remove iron from groundwater.
2- To remove leftover remnants of metal-based sludge, final purification of wastewater is performed after metal precipitation and sedimentation.
3- Wastewater from the production of iron, steel, and non-ferro alloys is purified at the end.
4- Precipitation/sedimentation,coagulation/flocculation/sedimentation,and flotation can all be used to prepare sand for filtering.
5- Purification of wastewater including grit from sandblasting and paint particles, such as those found in shipyards.
6- To allow re-use, it's also utilised as a final purification step (or before active carbon filtering).
7- As a drain-water disinfectant (slow sand filter) in greenhouse horticulture.
ADAVNTAGES OF SAND FILTER
1- The main advantage of a sand filter is the simple system that may be employed to produce high yields in many circumstances. A sand filter can be used as a pre-treatment, side-stream filtration, or polishing filter in many stages of water management.
2- A sand filter frequently produces effluent that can be reused. Chemicals, on the other hand, may be required to boost the sand filter's production.
MAINTENANCE REQUIREMENTS
It's simple to backwash a sand filter. Allow the pump to stop circulating water through the filter by turning it off. Unroll or attach the backwash line and turn the pump's setting valve to "Backwash" once the pump has stopped. Turn on the pump and let it run for a while. The water will initially be clear, but as more dirt and debris is removed, it will become darker. Allow the water to run until it is nearly clear again before turning off the pump. Set the setting valve to "Rinse" and let the pump run for 30 to 45 seconds in the rinse cycle. After rinsing the filter, reconnect the backwash line and return the pump to its original setting before restarting it.
