A mixture of hydrogen and oxygen called water is the key and irreplaceable element for life. We find it in all living creatures and it enables the activity of all vital processes in the organism. Besides, with water we satisfy our physiological needs, we keep everything clean and hygienic and we also use it for different technical purposes. Each of us spends around 150 liters of water per day, which means that there is a lot of »wastewater«. All of this water has to be cleaned before another use, release into the soil or in the open watercourses. The cleaning provides a man with an accelerated and controlled cleaning process using biological wastewater treatment plant.
In the first part of my diploma there are presented all the procedures and types of small wastewater treatment plants, which are used for wastewater treatment up to 2000 PE (population equivalent). Briefly is also described the current law, which prescribes how it is or will be necessary to regulate wastewater treatment.
In the second part of the diploma I tried to systematically examine the market in the Republic of Slovenia. I have also reviewed the price brackets of small wastewater treatment plants from 5-100 PE and tried to find the most economical solutions for a given situation.