DAICO Water Management

DAICO Water Management designs and engineers cost-effective and reliable industrial and commercial water treatment systems. We specialize in engineering industrial machinery for any water treatment problem.

Water Treatment Systems

Commercial water treatment systems work to remove minerals and pollutants from water. Each water treatment system designed by DAICO is custom engineered for the local water chemistry, operating conditions and desired purity. A complete system can include many levels of pretreatment, filtration, polishing and sterilization. We employ all water treatment processes to assure the most economical and environmentally friendly solution.

Reverse Osmosis Systems

RO is based on the process of osmosis. Osmosis involves the selective movement of water from one side of a membrane (a plastic film that looks similar to cellophane) to the other. To make the process work, pressure is applied to the contaminated water, forcing water through the membrane. Since contaminants do not move with the water as it moves across the membrane, purer water collects on the other side of the membrane. The purified water that accumulates on one side of the membrane can then be used or stored. A specific amount of pressure is necessary to separate purified water and contaminants. This required pressure is based on the type and concentration of contaminants in the water. Supplying even more pressure to the contaminated water than is required provides better separation and a higher production rate.

The levels of most dissolved compounds and suspended matter present in water can be reduced by RO treatment. The efficiency with which membranes reject the contaminant molecules depends on the pollutant concentration and chemical properties of the pollutant. Membrane type and operating conditions will also affect the degree of pollutant removal.

Efficiency of removal is often described using the term 'rejection percentage,' which is the percent of a particular contaminant that doesn't cross the membrane, i.e., is rejected by the membrane. It is important to know not only rejection percentages, but also incoming pollutant concentrations to effectively reduce contaminant concentrations in the drinking water to safe levels. Basic components of an RO system should include a prefilter to remove fouling agents such as rust and lime; an RO module containing the membrane; an activated carbon postfilter to remove residual taste, odor and some compounds from the purified water; a storage tank; and various valves, including a shut-off valve that stops the water flow when the storage tank is full. The system must also provide for waste flow to drains. Prefilters containing activated carbon are commonly used to protect chlorine-sensitive membranes.

Ultrafiltration/Microfiltration

Ultrafiltration and Microfiltration are both pressure driven membrane separation processes that separate particulate matter from soluble components in the carrier fluid (such as water). UF membranes typically have pore sizes in the range of 0.01 - 0.10 µm and have a high removal cabability for bacteria and most viruses, colloids and silt (SDI). A typical microfiltration membrane pore size range is 0.1 to 10 micrometres. The smaller the nominal pore size, the higher the removal cabability. Membrane filters are widely used in biotechnology and food and beverage applications where sterile product is required.
Increasingly used in drinking water treatment, it effectively removes major pathogens and contaminants such as Giardia lamblia cysts, Cryptosporidium oocysts, and large bacteria. For this application the filter has to be rated for 0.2 micrometres or less.

Most materials that are used in ultra- and micro-filtration are polymeric and are naturally hydrophobic. Common polymeric materials used in UF include: Polysulfone (PS), Polyethersulfone (PES), Polypropylene (PP), or Polyvinylidenefluoride (PVDF). For mineral and drinking water bottlers, the most commonly used format is pleated cartridges usually made from Polyethersulfone(PES) media. This media is asymmetric with larger pores being on the outside and smaller pores being on the inside of the filter media.

DAICO uses a DOW™ Ultrafiltration module which utilizes a double-walled hollow fiber (capillary) PVDF membrane, with a very small nominal pore diameter for PVDF material that allows for the removal of all particulate matter, bacteria and most viruses and colloids. Despite the small pore diameter, the membrane has a very high porosity resulting in a flux similar to that of micro-filtration (MF) and can effectively replace MF in most cases.

Systems designed with DOW™ Ultrafiltration use an outside-in flow configuration which allows for less plugging, higher solids loading, higher flow area and easy cleaning. The primary flow design is dead-end filtration but the module can be operated using a concentrate bleed. Dead-end filtration uses less energy and has a lower operating pressure than the concentrate bleed, therefore reducing operating costs.

Typically, DOW™ Ultrafiltration is operated at a constant permeate flow. The transmembrane pressure (TMP) will naturally increase over time and the module can be cleaned periodically by back flushing and air scouring to remove the fouling layer. Disinfectants and other cleaning agents can be used to fully remove and prevent performance loss due to biological growth as well as other foulants.

Industries

Drinking Water

Producing drinking water is one of the most important applications of reverse osmosis. While it was originally used for desalinating seawater, the decontaminating capabilities of reverse osmosis makes it effective for producing mineral-free drinking water.

Pharmaceutical

There are two primary grades of pharmaceutical water; purified for cleaning or other topical purposes, or water for injection. Water for injection requires an extremely high level of purity. Double pass reverse osmosis is used to remove microparticles, followed by EDI for sterilization. Dialysis requires large quantities of purified water which can be produced by reverse osmosis systems. Reverse osmosis can be paired with heat treatment or EDI for sterilization.

Power Plants

Impurities in boiler systems can cause a reduction in heat transfer, increased fuel consumption, steam contamination and carry over, corrosion, turbine deposits and potentially lost production. Filtration and reverse osmosis systems ensure a clean system, from low pressure steam generators to super critical power generation boilers.

Beverage

Proper water treatment in the beverage industry assures a healthier product and uniform taste.

DAICO Services

Installation

DAICO installs water treatment facilities worldwide.

Startup Assistance and Training

Daico Water Management doesn't install a system and leave you to figure out how to use it. We will startup any new system we install and provide on-site training in the operation and maintenance of unit. Daico can also reviewing the log sheets during the initial operation period and return to the job site for review and inspection of the system.

Maintainance

Repair