MBR membrane method is more and more widely used now, which attracts much attention for its stable and clear effluent. In order to minimize the maintenance effort in use, the following issues need to be noted during the design phase.
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01 is MBR membrane method suitable for this wastewater
The MBR is not universal. It belongs to the microfiltration membrane and is defined by the particle size that can be passed through. Therefore, for it, the problem of blockage is the key, some easy scaling, oily substances and more viscous substances in the waste water, it is recommended not to use MBR membrane method. The types of wastewater not suitable for MBR are: emulsion/abrasive/quenching/cooling fluid wastewater, surfactant wastewater, petroleum wastewater, and lipid wastewater (except pretreatment).
02 Design of MBR membrane module
1, the diaphragm assembled together to form a membrane module, pay special attention to the spacing between diaphragm and diaphragm are big enough, the effective distance is greater than 100 mm (axial distance greater than 140 mm), if the diaphragm itself membrane density, the effective distance to relax appropriately, the aim is to keep the flushing flow smoothly reach the top film silk, wire can also reduce the membrane between the harden and intercept, reduce the membrane component cleaning frequency; The spacing of the plate film is only 60 ~ 80mm. Too much spacing results in too much space being taken up;
2. The diaphragm can be installed both horizontally and vertically, depending on the installation space; Lateral loading, the film wire to maintain a slight droop, droop amplitude to maintain in 10mm, can also be said, in the premise of ensuring that the film wire is not pulled, as straight as possible, so that there will not be too much debris between the film wire and film wire; Vertical installation is recommended.
3, can't do the membrane component is very big, because too much of a membrane module, its installation density is big, the same mixing amount of air for it is inadequate, and accumulated a lot of wrap on the diaphragm, it need to spray cleaning of diaphragm, with water cannons or running water, to install too meeting too difficult for you to rush to the inner diaphragm, suggest a single membrane module processing not more than 1.5 m3 / hr.
03 MBR aeration device design essentials
1, aeration device can be fixed on the bottom (need to do a film components supporting frame and membrane components slide guide rail), can also do with membrane components together, each have advantages and disadvantages, revealed the location of the trachea to be carefully considered, using 3/4 "perforated tube, each corresponding diaphragm clearance along the perforated pipe, perforated Φ 2.0 mm size, hole spacing is 100 mm, tube perforation position by two adjacent road, orifice do single vertical, there are a lot of the practice of double row, inclined downward, personally think that is not desirable, sedimentation of sludge not jam on orifice.
2. Roughly estimate the amount of aeration. According to empirical data, it can be done according to the soda water ratio 24:1 (the depth of the conventional pool is 3.5m). The outlet of the fan is equipped with a vent valve, and 70% air volume can be removed by fully opening the diameter of the exhaust pipe. A silencer is installed on the outlet of the fan, which is used to control the DO value in the biochemical tank and protect the fan.
3. Separate regulating valve is set for aeration of each membrane module, and separate control valve should be made for oxygen aeration of the whole biochemical tank. Micro-hole oxygen aeration device ensures flexible adjustment of mixing air volume and oxygen air volume.
4. The best control of MBR pool DO is between 2.5 and 5. The normal level is about 3ppm.
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04 MBR pump design essentials
3, pump outlet pipe must be installed with transparent flowmeter and sampling valve, transparent flowmeter can be directly see the state of water quality, each flowmeter before or after the addition of a regulating valve, used to adjust the water output membrane components.
4, electrical control: generally set the MBR pump running for 13min, 2min stop, can effectively reduce the frequency of blockage, specific start and stop time to seek the advice of the manufacturer, in the electric contact pressure gauge pressure limit, can stop the pump and alarm; Suction pump to be able to linkage with the fan, fan in the state of stop, pumping pump does not work.
05 Chemical soak cleaning
1, in the case of conditional, in order to reduce the working strength, can realize the entire membrane component cleaning, this requires that completes the membrane module out of the pool into the pool, water pipes and the trachea to make convenient disassembly live (airway if you don't do with membrane module in trachea don't consider together), and the live connect to durable, personal advice quality flange connection or adopt famous brand of double by ball valve connection, membrane components and auxiliary driving, can effectively reduce the labor intensity, driving branded 500 kg (the actual can do 1 t lifting weight).
2. Three chemical soaking tanks shall be made, and the size of the film assembly shall be more than enough to be put in. The height shall be kept at the height of 500mm after the submerged film filament.
The total depth of the soaking tank = the height of the bottom platform + the height of the membrane assembly from the bottom to the topmost membrane wire +500mm ultra high.
3. Two liquid storage tanks shall be set on the side of three soaking tanks, whose capacity shall be larger than the effective volume of soaking tank, so as to reuse the cleaning liquid.
4. Each soaking tank shall be equipped with a plastic sewage pump, which is used to transfer the liquid medicine from the soaking tank to the liquid storage tank or discharge.
NaOH can be added to the system as a drug. NaClO can be directly discharged or stored for reuse after clarification treatment. Citric acid can be added to the biochemical treatment system slowly.
6. The amount of air to be mixed in each soaking tank shall be designed in accordance with the vigorous stirring, and a regulating valve shall be installed.
7, the soaking tank should be equipped with tap water to join the pipeline, the pipeline should be thick, to avoid wasting time in the water injection, filling time with 10min is appropriate, reference data, in the tap water pressure of 2~3 kg, DN50 tap water flow of about 18~22m3/hr.
8. Common chemical cleaning agents and concentrations:
NaOH (used for sterilization and cleaning of organic pollutants) : concentration 1%~2%, soaking time >2h;
Citric acid (used to remove inorganic scale, omitted if not) : 2% concentration, soaking time >2h;
NaClO (10% liquid, used for deep sterilization and recovery of membrane filaments filtration function) : 5% concentration, soaking time >2h;
Alcohol (95% industrial-grade alcohol) was soaked in a single piece for 2min to restore the membrane silk after water loss, and it was omitted if it was not dehydrated.
9. Cleaning steps: water rinse water leaching lye leaching citric acid leaching NaClO leaching water rinse reset.
10. Note that citric acid is an organic acid, which is not limited to use. However, if it is used more than 1 month before the next use, it will become moldy and deteriorate during storage.
11. Note that the broken film wire shall be checked after each cleaning, and the broken wire shall be tied with a single knot.
06 On line backflush
3, online reverse wash by PLC automatic control, once a day (premise is purchasing the diaphragm support online recoil, don't support but do, causing membrane) aperture expanding, recoil with water is water, at least the end of the tap water filter, filtration precision of about 50 microns, recoil water about 3 ~ 5 times that of the normal filtration flux and pressure of not more than 2.5 kg, otherwise it will cause damage to membrane silk, can be directly by tap water pipeline access, without pressure pump, but be sure to install pressure gauge and flow meter.
Hydrolazing, also known as aquablasting, hydroblasting, and aqualazing is a newer method of cleaning technology used at industries and other work sites. With the use of high pressure water, the Hydrolaze technology focuses on thorough cleaning of pipes and tubes without damaging surface materials and while protecting the environment. With minimum dirt and waste generated, hydrolazing has become a popular cleaning option for businesses that wish to make the most of advanced industrial cleaning methods.
Hydrolazing or hydroblasting is capable of cutting through grime, deposits and manufacturing fouling and then slicing through hard surfaces with unprecedented cutting power. It is the most versatile technology available to industry. A blast of water, with an added abrasive, under extreme pressure, results in unparalleled power.
Hydrolazing can be seen as a replacement of traditional chemical cleaning methods. The reason for this is many. To begin with, an equipment can be dismantled and clean with a Hydrolaze piece by piece, as compared to chemical cleaning procedures that required the equipment to be cleaned in one piece without dismantling. This helps a number of industries save time, money and effort of making sure that each and every part of the equipment is cleaned efficiently and thoroughly. As a more comprehensive cleaning solution, hydrolazing works well on a variety of surface materials and is considered to be one of the safest, harmless, and eco-friendly cleaning methods for large and small-scale industries.
Why choose automated hydrolazing for industrial cleaning applications
Advantages of using the Hydrolaze technology at industrial sites:
Accurate hydro demolition
Hydro-demolition is the process of cleaning surface materials with high-pressurized water, or preparing surface materials for further cleaning tasks. The high-precision hydro demolition achieved through hydrolazing helps in obtaining the desired results and focused cleaning on targeted areas. You can easily focus on one particular area due to the precision of water jet. Depending on the equipment used, settings can be controlled very precisely to get the desired result, and only a defined area will be affected.
Removes weak concrete
While the aim of Hydrolaze would be to protect the surface of materials going through the cleaning process, Hydrolaze does manage to remove weakened concrete materials, making the equipment stronger. A Hydrolaze equipment will never damage the equipment but will remove any weak or loose concrete in the direct firing lining, helping industries get rid of weakened concrete and other unnecessary materials from surfaces.
Chemical-free
No toxic or abrasive elements are used during a hydrolazing process. Only high-pressurized water is used for effective cleaning. This way, industries can break out from the risky and complicated chemical cleaning methods and opt for something that is non-abrasive, cleaner and safer. Water is the only material required for hydro demolition, and it is not necessary to use any potentially toxic or abrasive chemicals at any point in the process.
Environment-friendly
Since no chemicals are used, there are no fumes or pollution directly caused by hydrolazing. The water mixes with the concrete to form a slurry mixture, but this can be processed to extract and recycle the water. This way, hydrolazing is an environment-friendly way of cleaning industrial equipment and which keeps worksites clean, safe and dust-free. For businesses involved with corporate social responsibility activities and issues aim to deploy eco-friendly cleaning methods to keep industrial surroundings and environment protected and unharmed.
Wide application
Due to its effectiveness and hydro demolition abilities, hydrolazing has a wide application in a range of industries. Some industrial applications that use Hydrolaze technology are:
Training required
To perform a hydrolaze cleaning, a professional needs to be trained and licensed for the same. An expert needs to go through rigorous training that hardly takes a few days. Therefore, the training for hydrolazing is easy and quick, and it takes up to three days to learn the usage of the Hydrolaze equipment. Experience helps to improve efficiency, but the basic training does not require significant investment.
Completely automated
Hydrolaze equipment is a completely automated machine that includes various kinds of robotics features with relatively straightforward controls. This helps with high precision when it comes to hydro demolition. With hydrolaze equipment, you can control the water pressure, control, flow, and other factors that can help you achieve desirable cleaning results. An automated cleaning process like hydrolazing focuses more on calculating and control the pressure rather than just relying on the judgment of the operator.
Safer cleaning
Since the concrete being demolished is broken down into very small pieces and water is the only other material involved, safety risks when conducting hydrolazing are relatively low. Although specific precautions are still needed, most alternative methods are significantly more dangerous.
Hydrolazing can be utilized to clean the insides of pipes, tanks, and process reactors to remove chemical buildup, blockages, and scaling in the petrochemical, chemical and power industry in a timely and cost-effective method to reduce the amount of wastewater generated in the high-velocity flushes of those lines. For the best cleaning results, consult reputed industrial cleaning companies like Thompson Industrial Services to receive the best rates and assistance on hydrolaze cleaning.