The WWTP (Wastewater Treatment Plant) is the place where the water reuse treatments are carried out. These are processes that consist of collecting the water from a town or an industrial factory and applying certain treatments to be able to return the flow to a receiving channel such as rivers , reservoirs or the sea .
The process of reusing water from a sewage treatment plant is divided into five main steps, broken down into the pretreatment, primary treatment , secondary and finally line sludge and other waste. The designs of these purification systems are key to guarantee the proper functioning and efficiency in each of the phases of the process. Moreover, on numerous occasions, the vision of the designers has been translated into inappropriate designs and, consequently, numerous debugging processes have been classified as obsolete, when the error lay in the design.
To carry out a good design of a WWTP, it is necessary to guarantee the correct processing of the raw material, the wastewater . Therefore, one of the key processes to obtain a good processing in a WWTP is roughing, which consists of reducing the amount of solid elements that can reduce the effectiveness of water treatment. Likewise, it is important to take into account the synergies between the different processes and pay more attention to biological and physical-chemical processes .
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Another problem that is often found as a result of poor design is the size of the processing channel and the manual reserve screen . In both cases, it must be guaranteed that the wastewater can be processed by the WWTP, and this is only possible with the appropriate dimensions.
On the other hand, we find the grit trapsin which the sands accumulate that damage the deposits and come to inhibit the rest of the processes. It should be said that, on different occasions, the operators are the only ones who know in depth the damage caused by the sands in the anaerobic stabilization of sludge, which forces the cleaning times of the digesters to be shortened.
Finally, the last process to take into account is the dehydration of sludge since, if it is not cleaned correctly through a dehydration process , the sludge from the plant will end up back in the receiving channel.
For all these reasons, it is essential to know in depth the considerations set out for the design of a WWTP and thus guarantee its correct operation.
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