Osmosis, in contrast to reverse osmosis, is the natural process of mixing of the two liquids through a semi-permeable membrane. A semi-permeable membrane allows certain atoms and molecules to pass through but does not substantially others. For example, while admitting water molecules by osmosis, but almost no salt ions, and many other solutes which are located in our tap water.

Due to osmosis, the liquid having a lower concentration of solutes therein will flow via the semi-permeable membrane and into the liquid with a higher concentration of solutes to flow until there is a balance in the percentage of dissolved substances on both sides of the membrane. Although by osmosis comes to lie, the ratio of dissolved substances on both sides of the membrane closer to each other it will not be exactly equal to each other. This is caused by the water volume on the edge of the membrane where the water flow is increasing more and thus will also increase the pressure on that side. At the time that this pressure is high enough to stop the stream of water through the membrane will come to the process of osmosis to a halt. The pressure at which this occurs is the osmotic pressure.

The amount of pure water which is allowed through in the natural process of osmosis across the membrane is briefly summarized depends on, among others, a number of dissolved substances on either side of the membrane, and will stop as soon as the water pressure is equal to the osmotic pressure.

The above-mentioned process forms the basis of the best reverse osmosis system, in which using pressure, of course, the process is reversed.

Reverse osmosis

In reverse osmosis, the membrane is used as a highly fine filter which filters out many dissolved substances from the water. Reverse osmosis is an excellent and inexpensive way to purify water. The process of osmosis is reversed by water under pressure through a semi-permeable membrane (also referred to as semi-permeable membrane) to squeeze in which the natural osmotic pressure is reversed. The layer is designed so that small water molecules of pure water through it may, but larger particles or molecules are having a chemical composition not. The substances dissolved in the water which does not pass through the membrane will be discharged with the waste water. The pure water which is pressed through the membrane is osmosis water.

There are several factors that affect the rate at which water flows through a membrane and the quality of the osmosis water. The greatest influence on the following factors:

  • Operating Pressure: A higher pressure gives a higher yield and better treatment.
  • Temperature: A higher temperature gives higher yields and less favorable treatment.

Osmosis water will always contain some residual values. Under the test conditions which are used by the various manufacturers purify most of the membranes at least 95 to 97 percent of the dissolved substances from the water supply (These are minimum values and, in practice, this will usually be higher). Most osmosis devices which were to get on the market, are equipped with these membranes which are under the standard layers comprising various brands. The improved membranes such as the Filmtec 50 GPD (190 liters), Filmtec 75 GPD (285 liters) and the Filmtec 100 GPD HR membrane purification 98 to 99+ percent of the dissolved substances from the water supply.

RO system manure

A Wanner Hydra-Cell pump in a manure processing plant makes it possible to make fertilizer out of charge, and reusable water.

Pig slurry comprises 90% water. The solid is discharged. The water that remains is filtered through an RO system and released into surface water.

The membranes, pipes and the pump of the RO system must be cleaned every month with a hydrochloric acid solution to remove the build-up caused by scaling of salts.

The conventional piston may bad by design against salt deposits. The Wanner Hydra-Cell diaphragm hydraulic pumps are, however, by their ingenious construction is ideally suited for this application. Namely, the medium is completely separated from the driving portion which has the advantage that it is sufficient with a pump head of cast iron and Buna-N membranes.

The installation also has positive effects on the environment, because thanks to the manure processing plant, our customer fewer manure transports. A portion of the treated manure (60% clean water) is reused within the company.

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