Waste Water Evaporators Technology has improved over the years with new designs that utilize different concepts and workaround specially made to suit different applications. So far, there are different grades in the industry right now with the electric and gas evaporators design being the most common and the systems are continuously evolving incorporating latest engineering technology to produce a unit that achieves maximum heat transfer rate, utilizing the least amount of energy.
Usually the typical working concept of an evaporator depends on how the mechanism functions to convert water/liquid components into steam so that separation is achieved. Basically the efficiency of a new unit is determined by the evaporation ratio that usually ranges between 95 to 98 percent depending on the incoming waste water liquid composition. Most industrial grade waste water evaporators are designed to handle incoming influent with small amount of waste residue such as those coming from steam condensate, cooling systems, wash water from backwashing and other activities but there are others which are made with more advanced technology to handle bigger volume.
Let’s look at the most common setup of a typical unit sold in most countries. Generally, waste water evaporators are built with safety features incorporated to ensure that not only it functions properly but also all safety regulators are being put in place. Usually a typical unit should consist of a level controller so that incoming waste water does not overflow, just enough to fill the system and also the thermal sensors should be working well so that correct signals are relayed back to the system so that feed of energy can be controlled and minimized. Regardless of whether the heating concept is by using electric or gas, usually thermal heat exchangers must be designed in order to ensure that heat transfer is working at optimal rate. (The advantages of using evaporators over conventional waste treatment plant)
So far there are different manufacturers that offer various designs and depending on the type of incoming waste (whether the soluble waste is suspended solid floating on top or highly soluble together with the liquid), usually the exchangers are constructed differently and attached on different locations in the evaporation tank. Some are vertically placed while there are others which are basically horizontal and the most common problem faced by manufacturers have been on the accumulation of waste which degrade the performance over certain period of time in operation and the designer has to put this consideration in mind to ensure that this doesn’t happen. More on maintenance aspect.