Shallow Sand Filter for Sewage Treatment System

Min.Order: 1

Product origin: Xinxiang, Henan, China

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US$ 1000 ~ 10000

Description

Shallow Sand Filter for Sewage Treatment System:

The sand filter is composed of one or more standard high-speed sand tank units, with a unique water distributor and water collector inside, and a unique automatic flushing valve, which can realize multiple standard high-speed sand tanks one by one during normal system operation. Separate backwash, fully automatic program control. It has the advantages of small water consumption for backwashing, convenient equipment installation, and easy operation; the equipment has a large flow rate and requires no maintenance; according to different user requirements, there are two series of vertical and horizontal types, which are suitable for water quality treatment needs in many fields.

working principle:
filter state:
The shallow sand filter is composed of several filter units arranged side by side. When the system is in the filtering state, the unfiltered water is evenly distributed through the unique water distributor developed by ourselves, and the water passes through the packing layer (refined uniform-grained quartz sand) in the filter in a laminar flow state. When water flows through the packing layer, impurities are trapped in the packing layer. There are multiple evenly distributed water collectors at the bottom of the filter, which collect and lead out the filtered water evenly, and filter in advection, so that the filter can filter at a high flow rate and still achieve a better filtering effect.
Backwash status:
As impurities continue to accumulate in the packing layer, the internal head loss will continue to increase. When the loss of the inlet and outlet water pressure head reaches the set value, the system will automatically activate the constant pressure difference device to switch to the backwashing state. Easy to clean accumulated impurities. When the system is in the state of backwashing, the filtration continues, and the standard unit sand tank to be backwashed does not filter, while other standard unit sand tanks in the system are still filtering. Part of the filtered clean water is used to backwash the standard unit sand tank, and the rest is still sent to the user. The backwash sewage is discharged through the backwash drain of the hydraulic valve. In the high-speed sand tank high-efficiency filtration system, the special design of the water collector can make the fillers scrub each other to maximize the efficiency of backwashing, reduce the required backwashing water (clean water), and at the same time, there is no leakage during backwashing. material phenomenon. The backwashing time of a standard unit sand tank is 3 minutes. After the backwash is over, the internal pressure head loss of the standard unit sand tank is reduced to a reasonable range. The constant pressure device gives a recovery signal, and the hydraulic valve returns to the filtering state. The next standard unit sand tank Then it is ready to enter the backwashing state. The system can also control the backwashing by time. The default time is 4 hours, and the time can be adjusted on site according to the working conditions.

Shallow sand filter design parameters
a) Working temperature: 3~70ºC;
b) Operating flow rate: 35~50m/h;
c) Working pressure: 0.35~0.5MPa;
d) Water backwash intensity: 10~14L/m^2.S
e) Backwash duration: 2~3min;
f) Filling height of filter layer: 400mm;
g )Backwash form: water washing;
h) Operation mode: automatic;
i )Material selection: carbon steel, 304, 316, 316L stainless steel;
J)Filtration accuracy: Influent turbidity≤40mg/L, effluent turbidity≤5mg/L;

Product features of shallow sand filter
a) Small size, easy to install, save space; compact structure, save space; the product has good anti-corrosion performance and can be installed indoors and outdoors.
b) The equipment has good anti-corrosion performance and long service life.
c) Large amount of filtered water, good filtering effect; fast filtering flow rate and high filtering precision.
d) Automatic backwashing: Backwashing is automatically identified and controlled by the intelligent control system without manual intervention.
e) Uninterrupted water supply; when the equipment is backwashed, the filtering process is carried out at the same time, and the system supplies water as usual.
f) Adopt unique cloth and water collection device. Due to the unique water distribution system and evenly distributed water traps of the filtration system, the water flow is laminar during the whole filtration process, the plane of the filter sand bed is always flat during the filtration process, and the effluent quality is stable.
g) Use refined quartz sand or garnet as the filter medium. Choose according to the water quality, the smallest particle size of the filter material can be a homogeneous filter material of 0.16mm.
h)Long-term operation costs are low, saving electricity, water, and maintenance costs.

5. Applicable scope of shallow sand filter
a. The filtration of industrial water has certain system requirements for water quality. Such as: oxygen lance water in steel mills, boiler, heat exchanger water supply filtration, etc., which can filter out impurities in the water and avoid blockage of several nozzles in the pipeline.
b. Filtration system for industrial circulating water.
c. Raw water treatment can filter surface river water, lake water, sea water, reservoir water, well water and urban tap water as the water source of urban subdivision quality water supply, etc., to remove sand, suspended matter, algae, organic matter, etc. in the water.
d. Agricultural irrigation, especially suitable for water sources with high flow and good impurity content, such as irrigation of farmland water conservancy, irrigation of lawns in parks and golf courses, etc.
e. Food processing industrial water, paper industry, power plant industrial circulating water treatment, etc., industrial and medical pure water pretreatment. Industrial production water recycling, industrial wastewater treatment.
f. Industries such as aquaculture, swimming and water parks

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