Sequencing batch active sludge process for eliminating ammonia nitrogen from sewage

Abstract

The sequencing batch active sludge process for eliminating ammonia nitrogen from sewage includes the following steps: 1. settling sewage to eliminate solid impurity, making sewage enter to reaction pond with active sludge, and throwing nitrobacteria culture promoter comprising molasses 100 weight portions, metal salt 0.2-2.5 weight portions and adsorbent 1-8 weight portions, with the metal salt including component A of FeSO4 or FeCl2, and component B of MgSO4 and / or CaCl2, in the molar ratio of 10 to (0.5-5), the adsorbent being zeolite powder, diatomite, powdered active carbon, fly ash or their mixture, the sludge load being 0.05-0.3 kgBOD5 / kg.MLVSS, and the nitrobacteria culture promoter throwing amount being 5-20 mg / l; 2. aerobic nitrification reaction at dissolved oxygen concentration of 2-8 mg / l for 3-6 hr; 3. anaerobic nitrification reaction for 2-4 hr; and 4.letting sewage standing to settle sludge and exhausting supernatant.

Description

technical field [0001] The invention relates to a method for removing ammonia nitrogen from sewage by adopting a sequencing batch activated sludge method. Background technique [0002] Ammonia nitrogen is the most harmful pollution factor in water bodies. It will lead to eutrophication of rivers and lakes and weaken the self-purification ability of water bodies. Ammonia nitrogen in polluted water usually refers to nitrogen existing in the form of ammonia. Compared with other organic pollutants, it is much more difficult to remove ammonia nitrogen in polluted water. In the prior art, the removal methods of ammonia nitrogen in polluted water mainly include physical, chemical and biological methods. Physical or chemical methods include air stripping method, break point chlorination method, ion exchange adsorption method, flocculation precipitation method, electrodialysis method, catalytic wet oxidation method, liquid membrane method, etc. These methods are generally used for ...

AI Technical Summary

Problems solved by technology

The introduction of nitrifying bacteria from the outside can indeed ensure the smooth progress of the nitrification process in a relatively short period of time, but the operation and management are very inconvenient and the cost is relatively high, and the applicability of this method is not wide, such as for discharge It is not very suitable for large amount of industrial sewage treatment