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      HOME | 中文版 | ENGLISH
      EDI and ion exchange of the mixed bed the economical comparison

      Electricity to ion method (EDI) as a kind of water treatment technology in various fields have 10 years of business operation experiences, it is a use of electricity on water purifying technology

      EDI film pile on each film for plate frame type of assembly, each film by the selection of ion exchange membrane (a ZhangYang film, a Yin film) and allowed to flow through and promote the water flow composed of turbulence in every gate. In addition, crisscross of fill the membrane between such as hybrid ion exchange resin ionized conductive material. To fill up in membrane for the unit called purification effect of freshwater room, up the unit called gathered ion interaction salinity water room. Multiple membrane to form a film pile, film pile design for flat in film pile on the installation of a vice electrode (anode and cathode), the components of the film is often referred to as a EDI.

      In dc field, under the action of ions from the freshwater chamber selectively through ionic membrane into the thick water chamber last in freshwater chamber, make the products except salt water. The high salinity water chamber can be recycled to waste water treatment system recovery to other devices headend or use, small flow with equipment can be extremely water discharge as wastewater treatment.

      EDI most suitable for application in after RO desalination water fine treatment phase. EDI equipment without chemicals regeneration, may run continuously. In practical applications, only adjust EDI running current can change its effluent. In 60ms/water conductivity cm or for more low condition, EDI can make give 1-18MW cm product water j.

      Some vendors have now in various industries including laboratories, steam stand, pharmacy and semiconductor manufacturer production and sales, producing highly purified water in EDI systems, EDI industrial application focus on medium to large output purified water the use of 50gpm preparation and above), (in these applications, EDI can bring in environmental, safety and operational aspects of the significant benefit, it as RO out of the water purification unit is reasonable in technology, and can completely replace economic mixed bed ion exchange technology, this report on new production EDI and mixed bed technology will make economic comparison. Because EDI for film pile type design, belong to the patent water treatment system, it need not acid, alkali storage, processing and no wastewater discharge to new users, so it has a special appeal. Using EDI reconstruction of the old system is also very economic, because EDI can fully utilizing existing workshop and auxiliary facilities.

      The main research point

      general

      Research goal is to advance as after RO further treatment of EDI desalination with mixed bed ion exchange refinements style economical comparison. Assume the pretreatment process and RO water with fine treatment choice unit, so the water unrelated expenses not handling system calculation. If RO out water contains a high concentration of CO2, can be in EDI or mixed bed processed to reduce CO2 content, this can be done by water in RO after application carbon removal fan or the way by adding alkali method of improving RO fill PH finish.

      This study requirements in 50 - except brine output 600gpm within the scope of the new plant as an example, this flow range and general factory stood required considerable. Since most EDI systems to a module type, and the way of tectonic system design is practically unlimited maximum output.

      This study investigated three different product water output and three different content of solid TDS (all) combination of dissolved water processing system. Output select 50, 200 and 600gpm, for each of the output examines the TDS content is low, the water in these kinds of cases, and three water the component of incoming water table A, the RO system for the water. Normally, ion species and mixed condition for EDI and operation of the mixed bed no difference. Usually the content of SiO2 in 0.5 PPm below, free CO2 content of total does not exceed anion can be completely 50% for EDI water RO handle.

       

      In addition to the general definition of water quality for salt resistance is equal to or greater than the 17MW, 20PPb, actually requirements than SiO2 except the saline water allowed by this standard has certain changes.


      equipment

      All the equipment requirement is standardized, suitable for heavy industry, service life of continuous operation at least 20 years. Assume every system occupies the appropriate space, the space occupied due to EDI systems than the latter, and economically little more economical.

      EDI systems installed on the same shelf by multiple EDI film pile (50gpm for four of the film, 200gpm for 16 of the film, 600gpm for 48 of the film), power, strong water pump, control panel, the necessary valve etc, multiple film pile in the same film frame in assembly. EDI system USES generic film pile design, can provide different output of the flow volume. EDI the consumption of the content of TDS according to enter the size for each hour 1.1 - general KWh/kgal 28,000. A EDI film pile according to its normal output operation commonly in a short time, but could guarantee under the condition of water with higher flow operation.

      When EDI film pile requirements for maintenance and replacement (of course this kind of situation is rare), the rest of the film in the system could guarantee the premise of effluent water output slightly larger than normal load operation until faulty film pile be repaired or replaced so far. This ability can make its according to produce a water yield and provide a certain degree of water margin, and allows the system continuously running, of course, this film pile type system output enhancement is a limited (maximum output of the 20 percent increase. Also note that a larger output will increase EDI film pile operation differential pressure. Furthermore some EDI components can provide 100% margin, such as strong water pumps, etc.

      In the mixed bed system, to maintain continuous operation, general Settings have two beds. For 50gpm output of the mixed bed, its diameter is 30 inches; The diameter of the mixed bed 200gpm output for 54 inches; 600gpm output of the mixed bed can reach 90 inches in diameter, mixed bed respectively the operation cycle 24 hours (high TDS content), 36 hours (TDS content) and in 60 hours (low TDS content), mixed bed system also includes acid-base regeneration device, acidic or alkaline storage tank (30 days of storage capacity), alkali dilution water heater, blower, relevant instrumentation, control panel and wastewater and system (cans, pump, mixer, etc.). It should be pointed out that in EDI and mixed bed systems contain control panel, but the control of the mixed bed than EDI systems control dish dish bigger and more complex.

      Process inspection

      Here to choose the following main process discussion. Factory set to 100%, standing capacity for 20 ℃ temperature operation, Yang resin content 10kgr/ft3 (for 1kgr = 64.8 g), Yin resin for 9kgr/ft3 amount, acid-base dose for ft3 6lb /, ion exchange resin replaced every every four years, EDI film pile replaced every every five years. Research shows that the maintenance quantity for everyday USES EDI principally 0.5 work, and to each of the mixed bed renewable once 2 working. EDI systems 97.2%), the recovery of the mixed bed according to the operation time for recovery commonly 95.4 percent to 98.5%.


      Cost analysis

      The discussion here under different conditions of investment, installation and operation cost, cost data mainly inspects the annual spending. The investigation for 10 years, namely choice for 10% (assets investment coefficient for 0.16275), recovery coefficient of total annual expenses says there are 10 years period the annual spending data. Shorten time to review the apportion of unfavorable initial investment of annual operating cost calculation (favorable), lower investment coefficients on the annual operation cost disadvantage (initial investment) to share.

      EDI of the mixed bed equipment spending money comparison table B

       

      Installation cost the percentage of the total investment estimate for EDI systems cost coefficient, take 0.2%, mixed bed system, some engineering company take 0.4% to past often use these coefficient of the cost of the installation of new equipment for the budget. EDI installation and new RO system installation comparable, coefficient desirable 0.2%. Installation components of the mixed bed, and system more complex (lines connected also mat makings, pipe line and mutual connection), installation cost coefficient of the mixed bed and comparison of the flexible, when the cost of the installation of the mixed bed fell to 0.3%, coefficient of annual expenses according to specific circumstances a 3% reduction only to 5%.

      Operation cost

      Two sets of system in each process is primarily operating cost examination has the following aspects: human, the content of water consumption, waste water disposal etc. For EDI is concerned, the power consumption and EDI film pile replacement is extra operation cost, the cost of the mixed bed also includes the chemicals and resin as replacements, other such as alkali dilution water heating (every year usually $2000 for hundreds of to the pump and intermittent operation (every year in 200 - most $500) such less cost not included. The cost data: advisable human $40 / h, energy, water $0.07 $1 KWh/Kgal, wastewater $2 / Kgal, 100% sulfuric acid/dollar/lb, 100% of 0.05 $0.15 sodium hydroxide, Yang resin/lb ft3 55 dollars /, Yin resin ft3, $150 / $6,300 replacement costs of the film output GPM. / 125


      Cost analysis of discussion

      Under the condition of the annual cost of statistical table C. Table B gives the annual total investment cost of each system, operation and installation costs, expenses XuJi already before comparisons are have already made more precise discussion. EDI and mixed bed the annual cost comparison chart 1, and the results show that, in addition to the first kind of circumstance outside, EDI systems in the purification of water than the RO system more economic mixed bed. Along with the increase of water RO TDS, EDI in on the trend of increase with the cost. The output of bigger, 600gpm TDS, lower (4.16 PPM), EDI costs slightly higher than 10% mixed bed, it is mainly because EDI film pile caused the changed often. Because EDI technology, it just developed to take five years to study a replacement cycle. As can be expected, EDI film pile at least the service life can reach 6-8 years, this has in some of the early commercial applications are confirmed. Figure 2 shows the various conditions annual operating costs, here the film pile replacement period of five years. Selection Figure 3 give film pile for replacement period under the condition of 7.5 years of operation cost impact. Will change cycle of the film to extend higher after the strength, and low annual operating cost TDS situation adjusted results showed that the total annual fees from USES EDI principally for 110% of the cost of the mixed bed down to 95%.

      (figure 1, 2, 3 is abbreviated)

      Table C system, 000) annual expenses ($

       

      The new factory for standing in 50-200gpm output of the range, EDI is mixed bed fine treatment is obviously economic advantage. Mixed bed fine treatment system requirements with the corresponding supplementary facilities (chemicals storage and transportation system, wastewater and system), the low to medium in economic output equipment is not economical. For the 100gpm put is, EDI and mixed bed system cost roughly equivalent.

      Building space requirements

      The study did not include and construction or other requirements of the space has the related expenses. EDI systems comparable mixed bed system and its all the auxiliary facilities occupy less space. For new equipment fee estimate is concerned, reduce and EDI related infrastructure expenses is quite important, even make EDI used as mixed bed system of space, which is feasible in half. Assume an estimated cost of $75 infrastructure can fall, EDI ft3 / to 500ft2, which can save the investment costs $37,500.


      Environmental problems

      At present as enterprise number continues to expand, the use of harmful chemicals and related negative problems become more acute. Caused to chemicals including the operational personnel disputes operation and safety problems, prevent leakage measures, the discharge of wastes, and regular control. As water treatment technology development, now can use membrane treatment and other non chemical methods of water purification technology, EDI technology of a larger contribution this is.

      The study didn't examine chemicals from the shop floor to film processing system base (including EDI) problems caused, but can reduce the use of renewable potions the needs and to eliminate or the following tasks:

      · the necessary wastewater treatment and its related monitoring, emission test, regeneration wastewater adjustment of related activities.

      · contaminated area, facilities and according to the related chemical emissions from test of taking preventive measures.

      · staff handling harmful chemical drug training.


      Use a single increase of the mixed bed except brine storage tanks

      This study not detailed investigation take reduce the investment of the mixed bed system application single-user mixed bed (not double stage mixed bed) water making and increase except brine storage tank operation mode. In this way, if brief analysis shows that the storage tank installation sufficient supply of water), 8 hours, allowing the single machine mixed bed regenerative second without affecting the water supply system of system, then the initial investment no greater impact.

      Considering the system output, storage capacity corresponding can amount to 24,000 50gpm system), gal (gal (200gpm system 96,000 288,000 gal (and 600gpm system). The study shows that for investment projects, from removing a mixed bed budget will save about 20% of the initial investment cost. Anyway, increase the storage tank except brine will reduce costs, if can achieve save 20% of investment cost, can make the system of the mixed bed annual expenses correspondingly lower 6% to 12%. In short, if the new factory don't consider water treatment system composition and plans to install a larger except brine, using a single storage tank of the mixed bed is assured.


      Fill TDS increased

      When water TDS increases, the EDI system can run current way by increasing the effluent water and water in ensuring the conditions to adapt to this situation. So when RO system in addition to salt ability declined, EDI systems can be relatively unaffected (only increase consumption), and mixed bed system will shorten the cycle, thus increasing the use of chemical pesticides, increased human. The operational costs of the mixed bed have a major influence.


      summary

      The research of the application of new factory mixed bed fine treatment and EDI operation performance of system compares research and investigation, the three produce a water yield and three TDS combined operation of water, system produce a water yield choice for 50, 200, 600gpm, in each of these produce a water yield were investigated under the condition of low and high, medium and ingredients TDS content three operation. Research shows that EDI in low to medium produce a water yield system than the application of the mixed bed annual expenses more economy. For high yield water system, EDI also cost and mixed bed quite. In addition, the study showed that EDI can bring mixed bed system incomparable other benefits, these include wastewater monitoring, emission, smaller installation space, low anticorrosive requirements, operators of chemicals less operation treatment, water and water quality in ensuring the premise of only slightly improve operating expenses can adapt to changes in the water TDS.

      EDI to pure water preparation technology is a bigger contribution, it allows water treatment system in some application conditions do not use harmful chemicals. Research shows that the advantage of in addition to technical EDI outside, it also and mixed bed ion exchange technology with economic comparability, in many cases, it is mixed bed system of greater economic advantage possession

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      亚洲同志GV钙片在线观看
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