Industrial waste water evaporators can be used to purify water by distillation, which is a process that involves heating the water to its boiling point and collecting the resulting steam, which is then cooled and condensed back into a liquid form.
This process removes impurities and contaminants from the water, as they are left behind in the heating chamber.
To purify water using a waste water evaporator, we would need to follow these steps:
Pre-treat the water: Before we can use a waste water evaporator to purify the water, we may need to pre-treat it to remove any large particles or debris that could clog the evaporator.
Heat the water: The waste water evaporator will heat the water to its boiling point, which is typically around 100°C (212°F).
Collect the steam: As the water boils, steam will be produced. This steam is then collected and cooled, causing it to condense back into a liquid form.
Separate the purified water: The purified water is collected in a separate container, while the impurities and contaminants are left behind in the heating chamber.
Post-treat the water: in some cases we may need to post-treat the purified water to remove any remaining impurities or contaminants. This can be done using a variety of methods, such as filtration or chemical treatment.
It is important to note that waste water evaporators are typically used to purify large volumes of wastewater, such as in industrial or municipal settings. They may not be practical for purifying small amounts of water for household use.
Evaporator Types for Wastewater Treatment
There are several types of waste water evaporators, including falling film evaporators, rising film evaporators, and forced circulation evaporators. Each type operates slightly differently, but they all work by heating the water and collecting the steam that is produced.
Each type of waste water evaporator is used to purify water through the process of distillation. These evaporators include:
MVR evaporators, also known as mechanical vapor recompression evaporators, use a mechanical compressor to compress the steam produced by the evaporator. The compressed steam is then used to heat the waste water, increasing the efficiency of the evaporator. The purified water is collected as the steam condenses back into a liquid form.
MVR evaporators are typically more energy efficient than other types of waste water evaporators, as the steam produced by the evaporator is used to drive the compressor, rather than being wasted. They are often used in industrial and municipal settings to purify large volumes of water.
Falling Film Evaporators
In a falling film evaporator, the waste water is passed over a series of tubes or plates. As the water flows down the tubes or plates, it is heated and vaporized, producing steam that is collected and condensed back into a liquid form.
Rising Film Evaporators
A rising film evaporator operates similarly to a falling film evaporator, but the waste water is heated as it flows upwards through a series of tubes or plates. As the water is heated, it vaporizes and produces steam, which is then collected and condensed back into a liquid form.
Forced Circulation Evaporators
In a forced circulation evaporator, the waste water is heated in a series of tubes or plates. As the water is heated, it vaporizes and produces steam. A pump is used to circulate the water through the heating chamber, ensuring that all of the water is exposed to the heat and vaporized. The steam is then collected and condensed back into a liquid form.
Thermal vapor recompression (TVR) evaporators: In a TVR evaporator, the steam produced by the evaporator is used to generate power, which is then used to drive a compressor. The compressed steam is then used to heat the waste water, increasing the efficiency of the evaporator. The purified water is then collected as the steam condenses back into a liquid form.
Multiple Effect Evaporators
A multiple effect evaporator is a type of waste water evaporator that uses a series of evaporator units in series. Each unit operates at a lower temperature than the one before it, allowing the steam produced in the first unit to be used to heat the water in the second unit, and so on. This process increases the efficiency of the evaporator and allows it to purify large volumes of water. Multi effect evaporators are commonly used for high flow rate project requirements.
Heat Pump Evaporators
Heat pump evaporators use a heat pump to heat the waste water, rather than using direct heat. A heat pump is a device that uses electricity to transfer heat from one location to another. In a heat pump evaporator, the heat pump is used to transfer heat from the surrounding air or water to the waste water, vaporizing it and producing steam. The steam is then collected and condensed back into a liquid form, producing purified water.
Heat pump evaporators are generally more energy efficient than other types of waste water evaporators, as they use electricity rather than fossil fuels to heat the water. They are also more environmentally friendly, as they do not produce greenhouse gas emissions.
Vacuum Evaporators Treatment Applications
Evaporators are widely used in the following areas as per the application and treatment requirements:
Industries like Chemical, Pharmaceutical, Textile, Dyeing, Breweries, Automobiles, Milk, Food industries etc, generate high amounts of waste water.
WWTP and Desalination from RO Plants
Reject from Reverse Osmosis (RO) have a significant amount of brine that can be evaporated and concentrated by two effects evaporators.
Chemical / Pharmaceutical Industry
Double Effect Evaporators are often used to achieve the desired water quality for the production line or for treating the waste water from the production processes.
Milk / Sugar / Food Industry
Milk, sugar, fruit juice and tomato paste can be all concentrated by Double Evaporation systems
In any application, the most important factor to account for the waste water evaporator design is the feed effluent characteristic, which plays a major role in deciding the configuration of the equipment. To choose the most suitable design a lab test can assess the quality of the feed by testing for the liquid components and an evaporation test can be done to assess the concentration capacity of the evaporation technology.
After testing the water and waste water in a rotary evaporator an assessment report can be released and the waste water evaporator can be designed. In some cases, the distillate needs to have certain parameters that need to be respected, so testing is a must have procedure for avoiding mistakes in the treatment process.
Moreover, testing is useful to assess the wastewater evaporator cost, which mainly depends on the technology used for evaporation and the flowrate capacity.
Waste Water Evaporators Design Factors
For water and waste water treatment the most suitable design needs to account for the following principles:
Since many years YASA ET helps companies all around the world to find the best solution to their water and waste water problems by manufacturing and designing evaporators based on the project requirements and maximum treatment efficiency.
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