Multi-media channels utilized in water treatment, the normal ones are: anthracite – quartz sand – magnetite channel, enacted carbon – quartz sand – magnetite channel, initiated carbon – quartz sand channel, quartz sand – artistic channel, and so forth
Multi-media channel layer plan, the primary elements to consider are.
1, diverse channel media have an enormous thickness distinction, to guarantee that the discharge unsettling influence won’t happen after the blended layer peculiarity.
2, as per the utilization of created water to pick the channel media.
3, the molecule size requires the lower layer of channel media molecule size is more modest than the upper layer of channel media molecule size, to guarantee the adequacy and full utilization of the lower layer of channel media.
Truth be told, in a three-layer channel bed, for instance, the upper layer of channel media has the biggest molecule size, with a little thickness of light channel media, like anthracite, actuated carbon; the center layer of channel media has a medium molecule size and medium thickness, by and large comprising of quartz sand; the lower layer of channel media comprises of the littlest molecule size and the biggest thickness of weighty channel media, like magnetite. Because of the thickness distinction, the three layers of media channel media determination is essentially fixed. The upper layer of channel media plays a coarse filtration job, and the lower layer of channel media plays a fine filtration job, which gives full play to the job of multi-media channel beds, and the water quality is fundamentally better compared to that of single-layer channel beds. For drinking water, the utilization of anthracite, sap and other channel media is by and large restricted.
Quartz sand channel
The quartz sand channel is a channel that utilizes quartz sand as the channel media. It can successfully eliminate suspended matter in the water and significantly affects the evacuation of toxins like colloids, iron, natural matter, pesticides, manganese, microbes and infections in the water. It enjoys the benefits of little filtration obstruction, huge explicit surface region, solid corrosive and antacid opposition, oxidation obstruction, PH pertinent scope of 2-13, great enemy of contamination, and so forth The extraordinary benefit of quartz sand channel additionally lies in the enhancement of the channel media and channel plan to accomplish the versatile activity of the channel, the channel media has a solid versatile to the crude water focus, working conditions, pre-removal process, and so forth, for example the channel bed naturally frames the upper meager and lower thick This is helpful for guaranteeing water quality under different working conditions, and the channel media is completely scattered during discharging, bringing about great cleaning impacts. The sand channel enjoys the benefits of quick filtration speed, high filtration accuracy and enormous soil capture attempt limit. It is generally utilized in the field of pretreatment of different cycle water, homegrown water, flowing water and wastewater in electric power, gadgets, refreshment, faucet water, oil, substance industry, metallurgy, material, paper making, food, pool, metropolitan designing, and so on
Quartz sand channel hardware has straightforward design, activity can understand programmed control, huge handling stream, less backlash times, high filtration productivity, little opposition, simple activity and upkeep, and so on
Actuated carbon channel
The channel media is actuated carbon, which is utilized to eliminate shading, taste, leftover chlorine and natural matter, and its principle method of activity is adsorption, and initiated carbon is a falsely made adsorbent.
Initiated carbon channels are broadly utilized for the pre-treatment of water for homegrown use and in the food business, synthetic industry, electric power and different enterprises. In light of its all around grew fine pore structure and colossal explicit surface region, actuated carbon has a solid adsorption limit with regards to broke down natural substances in water, for example, benzene and phenolic mixtures, and it has a decent evacuation impact for natural poisons that are hard to eliminate by organic and compound techniques, like tone, scent, surfactants, manufactured cleansers and colors. Granular initiated carbon has an evacuation pace of more than 85% for Ag^+, Cd^2+, CrO4^2-plasma in water. In the wake of going through the actuated carbon channel bed, the suspended solids in the water are under 0.1mg/L, the COD evacuation rate is by and large 40%~50% and the free chlorine is under 0.1mg/L.
Discharging of the channel principally alludes to the way that after a specific pattern of utilization, the channel media layer holds and adsorbs a specific measure of garbage and stains, which makes the channel’s profluent water quality decay, mostly portrayed by: the channel’s typical post-filtration water quality turns out to be more terrible, the strain distinction between the delta and outlet pipes increments, and simultaneously, the stream pace of a solitary channel diminishes.
The guideline of discharging: the water stream inverts through the channel media layer, making the channel layer expand and suspended, cleaning the channel media layer with the shear power of the water stream and the impact rubbing of the particles so the soil in the channel layer is isolated and released with the discharging water.
The need of discharging
1, in the filtration cycle, the suspended matter in the crude water is held and adsorbed by the channel media layer and ceaselessly gathers in the channel media layer, so the pores of the channel layer are steadily obstructed by soil, framing channel cake on the outer layer of the channel layer, and the sifting head misfortune increments constantly. At the point when a specific cutoff is reached, the channel media should be cleaned, with the goal that the channel layer to reestablish the work execution and keep on working.
2, filtration because of expanded head misfortune, the water stream on the outer layer of the soil adsorbed in the channel media shear power increases, a portion of the particles in the effect of the water stream to the lower layer of the channel media, and in the end will make the suspended matter substance of the water rising, the water quality becomes poor, when the debasements through the channel layer, the channel lose separating impact. Consequently, somewhat, the need to clean the channel media to reestablish the soil holding limit of the channel media layer.
3, the suspended matter in the sewage contains a lot of natural matter, long haul maintenance in the channel layer will prompt the advancement and propagation of microscopic organisms and microorganisms in the channel layer, the peculiarity of anaerobic defilement, the requirement for customary filter plate supplier cleaning of the channel media.
Discharging boundaries control and assurance
1, extension tallness: discharging, to guarantee that the channel media particles have sufficient leeway so soil rapidly with the water out of the channel layer, the channel layer development rate ought to be bigger. Nonetheless, when the extension rate is excessively enormous, the quantity of particles in the unit volume of channel media turns out to be less, and the shot at molecule impact is diminished, so it isn’t great for cleaning. Twofold layer channel media, extension pace of 40% – – – – half .
Note: underway runs, the filling stature and development tallness of the channel media are checked arbitrarily, as during ordinary discharging there will be a run-out or wear of a portion of the channel media, which should be renewed. A generally steady channel layer enjoys the accompanying benefits: to guarantee the dependability of the channel water quality and to ensure the impact of discharging.
2, discharging water volume and strain: general plan necessities, discharging water strength of 40 m3/(m2 – h), discharging water pressure ≤ 0.15 MPa.
3, discharging air volume and strain: discharging air strength of 15 m/(m – h), discharging pneumatic stress ≤ 0.15 MPa.
Note: In the discharging system, the discharging air passed in is assembled at the highest point of the channel and its majority ought to be released through the twofold opening exhaust valve. In every day creation. The perfection of the exhaust valve ought to be checked often, chiefly as far as the opportunity of the valve ball to lift.
Consolidated air and water discharging
1, first flush with air, then, at that point, discharge with water: first lower the water level of the channel tank to 100 mm over the outer layer of the channel layer, pass in air for a couple of moments, then, at that point, discharge with water. Reasonable for channel lakes with weighty surface pollution and light inner tainting.
Note: The relating valve, shut should be set up; in any case, when the water level dips under the outer layer of the channel layer, the upper piece of the channel layer isn’t invaded by water, and the soil can’t be adequately released during the all over aggravation of the particles, yet will move further into the channel layer.
2, air and water joint discharging: from the lower a piece of the fixed channel layer at the same time sent out of sight and discharging water, air during the time spent ascending in the sand layer together to shape an enormous air pocket, while experiencing the channel material and become a little air pocket, while the outer layer of the channel material scouring impact; discharging water top free channel layer, with the goal that the channel material is suspended, to work with the cleaning of the air on the channel material. Discharging water and discharging air extension impact superimposed on one another, than a solitary procedure, the job is more grounded.
Note: the discharging tension of water and air discharging strain and strength is unique, should focus on the arrangement, to stay away from discharging water up high line.
3、After the joined air-water discharging, quit entering the air, keep a similar stream pace of discharging water and keep flushing for 3 min ~5 min to eliminate the air bubbles left in the channel bed.
Note: You can focus on the situation with the twofold opening exhaust valve at the top.
Examination of the reasons for channel media slabbing
1, the soil caught in the surface layer on the channel layer, if in a specific cycle, can not be successfully taken out, in the resulting discharging process, on the off chance that the dissemination of discharging air isn’t uniform will prompt lopsided extension tallness, with the discharging air scouring, scouring the limited quantity of spots, the outer layer of the channel media, for example, oil and different contaminations can not be adequately eliminated, in the following ordinary pattern of water filtration after the info, the neighborhood load builds, pollutants will be sunk from the surface into the inward The pellet slowly increments and stretches out to the filling profundity of the channel simultaneously, until the entire channel fizzles.
Note: In genuine activity, the peculiarity of lopsided discharging air frequently happens, essentially because of the hole of the base air circulation pipeline, the blockage or harm of the neighborhood channel cap or the disfigurement of the separating of the lattice pipe.
2, the outer layer of the channel layer of fine particles, discharging crash amazing open doors with one another less, the energy is little, so it isn’t not difficult to clean. The appended sand particles are not difficult to frame little mud balls. At the point when the channel layer is re-reviewed toward the finish of discharging, the mud balls will enter the lower layer of channel media and move increasingly deep as the mud balls develop.
3, the oil contained in the first water, caught in the channel, by discharging and leftover parts, over the long run, is the primary variable prompting channel media scheduling. When to complete discharging not entirely settled by the water quality attributes of the crude water and the water quality necessities of the emanating, utilizing models, for example, restricted head misfortune, gushing water quality or filtration time.
Notes on channel handling and acknowledgment process
- The equal resistance between the power source tank and the channel plate is needed to be something like 2 mm.
- The level and lopsidedness of the channel plate are under ±1.5 mm, and the design of the channel plate is best handled in general. At the point when the distance across of the cartridge is bigger, or dependent upon the imperatives of unrefined substances and transportation, two folds can likewise be joined and shaped.
3, the channel plate and the cartridge body of each joint piece of the sensible handling, the air discharge interface is especially significant.
(1) In request to dispense with the outspread hole between the channel plate and the cartridge brought about by blunders in the handling of the channel plate and the moving of the cartridge, the round ring plate is for the most part welded segment by area. The contact parts should be completely welded.
(2) The spiral hole between the focal cylinder and the channel plate is taken care of similarly as above.
Note: The above measures guarantee that the channel and discharge must be associated through the hole between the channel cap or the release pipe. Simultaneously, the consistency of the dispersion of discharging and sifting channels is additionally guaranteed.
4, the channel plate handling of through-opening, outspread mistake of ± 1.5 mm. channel cap guide bar and channel plate through-opening between the increment in the size of the fit, not helpful for the establishment of the channel cap or fixed. The handling of the through-opening should utilize mechanical gear.
5、The material of the channel cap, nylon is awesome, ABS is the subsequent best. Since the upper piece of the additional channel material, the pressing burden on the channel cap is very high, requiring high solidarity to keep away from deformity. The contact surface of the channel cap and the channel plate (upper and lower surface) ought to be outfitted with versatile elastic cushions.