Method for implementing shortcut nitrification in complete nitrification biological denitrification system at normal temperature

Abstract

The method for realizing short distance nitration at the normal temperature by using an entire journey nitration biological denitrification system belongs to the field of the wastewater enhancing biological denitrification treating technique. At present, the realization of nearly all short distance nitration is carried out in the medium-high temperature state; the short distance nitration is difficult to start in the medium-low temperature and the starting period is long, which greatly limits the actual application of the nitration denitrifacation. In the method, the sludge age is controlled to be 50-60 days; the whole process is divided into four stages; each stage uses an aeration mode with constant air supply; the DO level is controlled to be 0.5-0.8 mg / L; the initial stage of the experiment uses timing control aeration time; and finally, the aeration is finished at an ammonia valley point of a pH curve. The invention provides a method for regulating and controlling the competitiveadvantage of nitration flora AOB and NOB in a sewage treating system at the normal temperature. In addition, the invention is started by the common entire journey nitration sludge which maintains theshort distance nitration, thus being more in line with the practical running of the sludge treating factory and has very strong directive significance in the short distance denitrification application of the practical project.

Description

A method for realizing short-range nitrification in a whole-process nitrification biological denitrification system at room temperature technical field The invention relates to a method for realizing short-range nitrification in a whole-process nitrification biological denitrification system at normal temperature, which is used for treating urban sewage at normal temperature and starting and maintaining short-range nitrification in an ordinary full-process nitrification biological denitrification system. Background technique In recent years, in order to control the eutrophication of water bodies, the sewage nitrogen and phosphorus discharge standards have become increasingly stringent. The new national sewage discharge standard stipulates that the first-level discharge standard (A standard) of ammonia nitrogen concentration shall not exceed 5mg / L, which puts forward higher requirements for effluent ammonia nitrogen. Therefore, the research and development of economical, ef...

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Problems solved by technology

Although some researchers started short-cut nitrification at a lower temperature, the inoculated sludge was partially nitrosated sludge (NO2--N / NOx--N≈50%), which weakened the adverse effects of low temperature during the start-up period.

At present, there are few reports on the successful initiation of short-cut nitrification in a system inoculated with full-process nitrification sludge in the treatment of urban sewage at room temperature.

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