Quartz Sand Filter

The introduction of quartz sand filter

The quartz sand filter has a good removal effect on suspended solids in industrial sewage. It uses quartz sand as the filter medium. Under a certain pressure, the water with high turbidity passes through a certain thickness of granular or non-granular quartz for sand filtration, Effectively intercept and remove suspended solids, organic matter, colloidal particles, microorganisms, volatilization, smell and some heavy metal ions in water. Ultimately achieve the effect of reducing water concentration and purifying water quality.

Classification of quartz sand filters

Quartz sand filters are generally divided into two categories: one is conventional quartz sand filters, also known as shallow media filters. The other type is an emerging filter called a continuous sand filter, also known as a quicksand filter.

shallow media filter:

The shallow media filter is composed of multiple standard high-speed sand tank units, with unique water distributors and water collectors inside, and a unique two-way automatic flushing valve, which can realize multiple standard high-speed sand tanks during normal system operation. Cylinders are individually backwashed one by one, fully automatic program control.

When the system is in the filtering state, the unfiltered water is evenly distributed through the unique water distributor, and the water passes through the packing layer in the filter in a laminar flow state. As water flows through the packing layer, it ends up trapped within the filler layer. There are multiple evenly distributed water collectors at the bottom of the filter, which evenly collect and lead out the filtered water for advection filtration, which allows the filter to filter at high flow rates and still achieve good filtration. It has the advantages of less water consumption for backwashing, convenient equipment installation, and easy operation.

continuous sand filter:

Continuous sand filter is an innovative high-tech environmental protection product with unique design. This filter equipment can effectively remove suspended solids and colloids in raw water (or wastewater).

The continuous sand filter does not need a high-power, high-flow, high-lift backwash pump to backwash the dirty sand filter layer. When the raw water flows through the water inlet, it passes through the water distributor and flows upward through the filter bed. The dirt is filtered during the rising process. The filtered water is collected and discharged by the overflow weir at the top of the filter.

At the same time, the compressed air is ejected from the nozzle of the compressed air inlet pipe extending into the mouth of the sand lifting pipe, driving the dirty sand and part of the water at the bottom of the filter to rise to the upper port of the sand lifting pipe and fall into the sand washing tank. The cloth sander circulates back to the filter layer. The operation is very simple, without opening the backwash water pump and the corresponding pipe valve.

The advantage of quartz sand filter

By optimizing the filter material and filter design, the quartz sand filter realizes the self-adaptive operation of the filter. The filter material has the strongest adaptability to the raw water concentration, operating conditions, pre-process, etc., that is, the filter material is automatically in the state of upper and lower density during filtration, which is conducive to ensuring the quality of the effluent water under various operating conditions. The filter material is fully dispersed during backwashing, and the effect is good.

Quartz sand filter can effectively remove suspended solids in water, and has obvious removal effect on colloid, iron, organic matter, pesticide, manganese, bacteria, virus and other pollutants in water.

Quartz sand filter has the advantages of fast filtration speed, high filtration precision and large sewage interception capacity.

Quartz sand filter is mainly used to remove impurities in water, and achieve the purpose of water purification through interception, sedimentation and adsorption of filter material. Quartz sand filter also has the advantage of good cleaning effect.

What is the fine filtering effect of quartz sand filter?

The filtration accuracy of the quartz sand filter is between 0.005-0.01m, which can effectively remove colloidal particles and high-molecular organic matter. The quartz sand filter uses the refined quartz sand filter material filled in the filter. When the incoming water flows through the filter layer from top to bottom, the suspended solids and viscose particles in the water are removed, thereby reducing the turbidity of the water.

The quartz sand filter uses quartz sand as filler, the quartz sand filter material layer is thicker, the filter tank is deeper, and the civil construction cost is higher. The filtration efficiency is high, the filtration effect is good, there is no need to stop and backwash, and the operation cost is low.

When the quartz sand filter is filtering, the filter bed automatically forms an upper sparse and lower dense state, which is conducive to ensuring the quality of the effluent water under various operating conditions. The filter material is fully dispersed during backwashing, and the cleaning effect is good.

What affects the filtration speed of quartz sand filter?

The filtration speed of quartz sand filter is affected by the filter layer. Generally speaking, the thicker the filter layer, the slower the speed of the quartz sand filter.
The filtration speed of the quartz sand filter is affected by the quartz sand filter material. The smaller the particle size of the quartz sand filter material, the better the water purification effect. However, the filtration rate through the quartz sand filter will be reduced, so the particle size of the quartz sand filter material is not as small as possible.

Is the faster the filtration speed of the quartz sand filter, the better the water quality?

The faster the filtration speed of the quartz sand filter is, the greater the water flow rate will be. If the flow rate is too high, it may cause the filter material to tumble and not have a good water purification effect. In addition, the backwashing speed of the quartz sand filter is also limited. When the filtered water quality does not meet the requirements, it is necessary to backwash the entire equipment to remove the pollutants adsorbed by the filter material. If the backwashing speed is too fast, the filter material will flow out, resulting in waste; if the backwashing speed is too slow, the cleaning effect of the filter material will not be achieved.

How to choose quartz sand filter?

The selection is made according to the concentration of pollutants in the influent water quality.

Common carbon steel rubber-lined multimedia filter materials include quartz sand, activated carbon, anthracite, softening resin, etc. Quartz sand is mainly used to filter suspended solids, organic matter, colloidal particles, microorganisms, chlorine, smell and some heavy metal ions in raw water. Activated carbon is mainly used to absorb the color and odor of raw water. Anthracite removes mechanical impurities and insoluble organic impurities from the feed water. The softening resin is mainly exchanged with metal ions in raw water, which is more suitable for filtering raw water with more metal ions.

How to choose the model of quartz sand filter?

Import and export diameter: In principle, the inlet and outlet diameter of the quartz sand filter should not be smaller than the inlet diameter of the matching pump, generally consistent with the inlet pipe diameter.

Nominal pressure: Determine the pressure rating of the filter according to the pressure that may occur in the filter pipeline.

The main consideration is the particle size of impurities that need to be intercepted by the quartz sand filter, which is determined according to the process requirements of the medium.

Filter material: The material is generally selected to be the same as that of the connected process pipeline. For different conditions of use, filters made of cast iron, carbon steel, low alloy steel or stainless steel can be considered.

Application of quartz sand filter

Quartz sand filters can be widely evaluated in electronic power, petrochemical, metallurgical electroplating, paper textiles, pharmaceuticals, food and beverage, domestic wastewater, factory water, swimming pools, etc., and can meet the filtration needs of various industries.

The quartz sand filter is small in size, easy to install and saves space. It can be installed outdoors without building a house. The product has good anti-corrosion performance and can be installed indoors and outdoors, saving civil construction costs.

Quartz sand filter can be used in industrial water, domestic water and municipal water supply systems that require effluent turbidity of 5mg/L to meet drinking water quality standards.

Quartz sand filters can be used as pretreatment equipment in ion exchange softening and desalination systems, and coarse filtration equipment for industrial water supply that does not require high water quality.

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