**3. Conclusions**

POPs and their by-products, being present in small amounts, have proven to be a challenge for a wide range of water treatment technologies. Conventional treatments such as adsorption in all its variants and membrane technologies have a moderate cost, they are carried out in an acceptable period, but their removal efficiency depends on the pollutant characteristics. On the other hand, advanced oxidation processes have very good removal percentages, their process time is short, but there are methods with a very high cost, and they are not friendly to the environment due to the large amount of energy they consume. However, biological treatments take a little more time compared to other processes, but they have very good removal efficiency, are environmentally friendly, and save energy. It is important to consider that each study carried out works with different treatment conditions, such as pH and temperature, toxic compounds concentrations, organic matter load, and its composition, which influences the success of the tests. While studies are still being conducted to find the best way to remove POPs from water, everything indicates that biological treatments are so far the best option.

*Methods for Persistent Organic Pollutants Removal in Wastewater: A Review DOI: http://dx.doi.org/10.5772/intechopen.99973*
