Automatic Backwash Multimedia Filter water pre-treatment
Multi-Media Filters
Multimedia filter also called as mechanical filter, is composed of deep-bed system with multi layers of media in the tank. The major media to be applied in the system are sand and anthracite. The lightest and coarsest material is located at the top layer of bed for the removal of the larger suspended particles, while the heaviest and finest one is located at the bottom layer of bed to remove smaller one present in the source water.
The sand usually acts as a form of chemical treatment that, when in contact with soluble iron in water, reduced the iron from the soluble form to an insoluble form that will precipitate out of solution. The anthracite then can filter both the precipitated iron out of the solution as well as other entrained particles that have entered the water source. The combination of anthracite and sand together can remove a majority of suspended particles greater than 10 microns in size. After treatment, the SDI (Silt Density Index) is reduced and the turbidity reaches less than 3 from 20.
The systems require backwashing to remove the accumulated contamination of suspended particles and rinsed by downflow clean filtered water before use in order to extend bed life.
Multimedia Filtration is widely used in the water pre-treatment, which available with Automatic and/or manual operational features. The tank material includes fibreglass reinforced plastic and stainless steel.
Working principle:
For the by-pass filtration, the filter is installed in the main circulating pipeline to filter all the circulating water,
but apart of the circulating water led from the main circulating pipeline is filtered, which is a repeated
circulatininterception step by step to filter the impurities within the system and finally remove the impurities
by thenecessary backwash out of the system. Installing a by-pass filter in the circulating water system can
prevent the terminal pipe of device from sludge blocking and remove the impurities in the system with
chemical dosing.
By-pass filtration is used to reduce the turbidity of the water circulation system, exactly, to reduce slime
and
prevent its deposition in the heat exchanger, so that the effect of agent will be better.
Generally speaking, if your filter is a quartz sand filter, it usually has two main functions:
1. To reduce suspended solids (turbidity). Otherwise, as the system is running, suspended solids increases
, which will exacerbate the deposition and other problems.
2. Degreasing. Especially the oily turbid circulation, such as steel rolling and continuous casting, has high
oil content and is easy for breeding microorganism and blocking the nozzles.
Parameters
Pressure rating: 0.25Mpa~2.5Mpa
Single filter flow :2-50 m3/hour
Working temperature range: 0 ~ 65 °C
Effluent turbidity:less-than 3
Inlet and outlet Connection: flange
Backwash water: for total filtered water 1 to 3%
Control mode: pressure control; PLC timing control
Sewage way: automatic
Rated operation voltage: can be customized
Specifications:
Model |
TANK SIZE
(mm) |
TOTAL HIGH
(mm) |
FLOW RATE
(m3/hr) |
INLET AND OUTLET
(mm) |
YLD-MF-500 |
500*1500 |
2350 |
~2 |
DN32 |
YLD-MF-600 |
600*1500 |
2380 |
2-3 |
DN32 |
YLD-MF-700 |
700*1500 |
2400 |
~4 |
DN40 |
YLD-MF-800 |
800*1500 |
2400 |
~5 |
DN40 |
YLD-MF-900 |
900*1500 |
2500 |
~6 |
DN50 |
YLD-MF-1000 |
1000*1500 |
2600 |
~8 |
DN50 |
YLD-MF-1200 |
1200*1500 |
2700 |
~11 |
DN65 |
YLD-MF-1400 |
1400*1500 |
2800 |
~15 |
DN65 |
YLD-MF-1500 |
1500*1500 |
2850 |
~18 |
DN65 |
YLD-MF-1600 |
1600*1500 |
2900 |
~20 |
DN80 |
YLD-MF-1800 |
1800*1500
1800*1800 |
3000 |
~25 |
DN80 |
YLD-MF-2000 |
2000*1500 |
3100 |
~30 |
DN100 |
YLD-MF-2200 |
2200*1500 |
3180 |
~38 |
DN100 |
YLD-MF-2400 |
2400*1500 |
3330 |
~45 |
DN100 |
YLD-MF-2500 |
2500*1500 |
3380 |
~50 |
DN100 |
YLD-MF-2600 |
2600*1500 |
3430 |
~55 |
DN125 |
YLD-MF-2800 |
2800*1500 |
3530 |
~60 |
DN125 |
YLD-MF-3000 |
3000*1500 |
3630 |
70-80 |
DN125 |
YLD-MF-3200 |
3200*1500 |
3730 |
80~100 |
DN150 |