| Summary: | The author argues that the current standards of the quality of discharged waste waters are the drivers of new technologies of their treatment. Now traditional biological treatment is considered a universal method. However, compliance with the most recent standards requires that efficient removal of phosphorus in the course of biological processes must rise from 20 - 40 % to 98 - 99 %, efficiency of treatment of ammonium must go up to 98 - 99 %, while the share of nitrate and nitrite compounds formed in the course of biological treatment must be limited.
Given the fact that the contemporary method of treatment of waste water must meet the ecological requirements and be economical, improved technologies of biological treatment are most acceptable ones.
For practical purposes, the most solicited technologies are those that are based on the alternation of aerobic and anaerobic conditions of treatment of waste waters and/or active sludge. The most widely spread aerobic - anaerobic technology of treatment employs the method of biological nitrification - de-nitrification, which is the only method of removing all nitrogen compounds (ammonium, nitrite, nitrate) in accordance with the regulations that are effective in our country.
Any accompanying microflora boosts the overall biomass, and the laminar structure of the biological film assures the simultaneity of both aerobic and anaerobic processes, and, therefore, it intensifies the process of treatment.
Application of chemical treatment is an essential constituent of the waste water treatment technology, as it assures in-depth removal of phosphorus.
|
|---|
