Valveless filter

Valveless filter

First, the use of
Steel gravity valveless filter products, widely used in surface water purification (such as Dazhong Xiao landscape water, artificial rivers and lakes, fountains and other circulating water filtration); groundwater in addition to fierce iron removal; Production wastewater to remove suspended impurities; organic wastewater by biochemical treatment, secondary sedimentation tank after the follow-up filtration, and indoor swimming pool water filtration.

Second, the general introduction
The small size of the filter tank products, using square, flat roof, large size circular, vault roof, good sanitary conditions, can be set open-air, compared with the reinforced concrete filter, small weight, can be The use of asphalt sand flexible foundation.
There are two series of valveless filters; one is a square filter, the filter water volume 20m3 / h to 175m3 / h; the other is a circular filter, the filter water volume 20m3 / h to 80m3 / h, 200m3 / h To 750m3 / h. Among them, the total volume of filtered water from 20m3 / h to 175m3 / h is transported to the site and the volume of filtered water is from 200m3 / h to 750m3 / h. The manufacturer prefabricates several parts and delivers them to the site for assembly. Unit, after loading filter can be debugged and run.

Third, process introduction
Drainage system using the team, the positive, gravity filter to water their own water area, the role of siphon head backwash. Therefore, there is no need to set backwash pump backwash water towers like high-speed filters, medium-speed filters, mechanical filters, and general quick filters. The filter tank, the use of more with the number of flush pipe, and arranged in their respective area of the shape of the mandrel. Therefore, backwash water distribution of water, and its filtered water and then clean the water area with taps set collection trough, the canister in place, the level of the tank weir top adaptability, which can be uniform catchment.
Filter larger size products, compared with the national standard reinforced concrete gravity valveless filter, an increase of Meizu three-seat series (that is, a filter backwash, from the same group of three cans supply anti- Flushing water) The maximum control value of the head loss at the end of the period is also 1.7m of the national standard figure, increased by 1.5m and 1.9m twice, providing a convenient choice for elevation design of water purification plants.

Fourth, process characteristics
Filtering at run time - Put backwashing - Terminate backwashing - Resume filtering for the next cycle, all done automatically. This automatic, is a hydraulic automatic, is the automatic formation of the hydraulic process, without personnel supervision. Therefore, to change the filter water, water, backwash water supply, backwash water exclusion valve control are not required, do not set as high-speed filters, medium-speed filters, mechanical filters have been ordinary fast filter (both Need to set more than four valves), without the need to install the time required careful maintenance of process control instruments or process control instruments. However, the inlet valve should be set for the first time put into use to balance the number of cans of water into the filter; in the same group connected to the hotel need to configure the valve on the valve for rotation to stop using water for maintenance.

Five, working principle
The raw water is fed into the filter tank through the water inlet pipe and filtered through the filter layer from top to bottom. The water is injected into the village water tank from the communicating pipe. After the water tank is full, the water flows into the water tank through the outlet pipe, and the filter layer continuously intercepts the suspended substances, Layer resistance gradually increased, thus contributing to the siphon water level rising. When the water level reaches the siphon auxiliary tube nozzle, the water falls from the tube, and the air in the siphon drop tube is taken away through the air suction tube. When the degree of vacuum reaches a certain value, the siphon effect occurs. At this moment, the water in the water pipe passes through the filter layer from bottom to top, and backwash the filter material. When the water level in the flushing water tank drops to the siphon tube, the air enters the siphon tube, destroying the siphon effect.

Six, equipment components
Steel gravity valveless filter from the water system, water filtration system, water distribution system flushing system and other components.
Intake system: The double box combination of water distribution box, both water, but also with water distribution.
Drainage system: under the flushing tank and the top of the filter room will be filtered out of water and water to be separated. Top cover with a cone of about 15 °, is conducive to backwash the convergence of the drainage pipe top, the siphon pipe discharge.
Water distribution system: Its grille with a small resistance distribution system, catchment up to 500mm so flushing water more evenly.
Flush system: Including flushing water tank, connecting pipe, siphon and so on. Rinse tank placed in the top of the filter, the tank volume by a filter to determine the amount of water required once rinse. The function of communicating pipe is to filter the water into the rinse water tank, rinse the rinse water into the filter. The most important part of the system is flushing. Flushing is fully automated. When the siphon is siphoned, flushing begins. When air enters the siphon it destroys the siphon and the filter backwash ends. So the siphon is the key to the process of flushing, using siphon auxiliary tube, can accelerate the formation of siphon. Conversely, in order to make the siphon completely destroyed, in the destruction of the bottom tube siphon damage bucket. However, for regulatory purposes, an extra flush is forced to flush the filter head loss before it reaches the maximum. Rinse intensity regulators control the rinse intensity.

Seven, gravity valveless filter purposes
1, for the oil, chemical, metallurgy, electric power, oil refining, light industry, textile and other industrial circulating cooling water filtration.
2, for surface water purification, iron and manganese in addition to groundwater.
3, for urban, township water plant filtration treatment.
4, for softening, desalination pretreatment.
5, for the pool, fountain water purification.
6, for the production of suspended solids removal wastewater, organic wastewater by biochemical treatment, secondary sedimentation tank followed by filtration and so on.

Eight, process design data introduction
1, the average filtration rate: 8-10 m / h;
2, the average backwash intensity: 15 liters / m 2 · sec;
3, backwashing duration: 5 minutes;
4, the end of the head loss value: 1.50 meters, 1.70 meters, 1.90 meters (third gear optional);
5, backwash inflation height: 700 × 40% plus 100mm high safety;
6, filter layer height: 700mm supporting layer thickness 270mm;
7, Intake turbidity: not more than 15 degrees, the maximum value of not more than 30 degrees;
8, water turbidity: not more than 3 degrees.
9, on the maximum allowable suspended solids content or iron, manganese content, filtered water, water quality indicators, it should be run-time control, with appropriate backwash cycle to control the filtered water is not exceeded.

Nine, filter the general category and configuration
1, the filter sub-single, double, three.
2, filter types: quartz sand, burning rock particles, fiber ball, anthracite, rubber particles (points size not specified one by one)
3, Filter Height: Pebble supporting layer 200mm filter layer 700mm

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