Sewage treatment method and equipment for removing total nitrogen without external carbon source

Abstract

The invention discloses a sewage treatment method and equipment for removing total nitrogen without an external carbon source, wherein the method comprises the following steps: 1) dividing sewage fedby a water inlet pipe into four parts, respectively feeding into an anoxic tank and three aerobic tanks, feeding 70% of the sewage into the anoxic tank, and uniformly feeding the rest 30% of the sewage into the aerobic tanks; 2) after treatment in the anoxic tank, enabling the sewage to enter the aerobic tanks to be mixed and reacted with inflow water, enabling nitrifying bacteria to ammoniate ammonia nitrogen and organic nitrogen in the sewage into ammonia nitrogen, converting the ammonia nitrogen into nitrate through nitrification of nitrifying bacteria, and enabling a mixed solution in theaerobic tanks to flow back to the anoxic tank through a reflux device; 3) after the sewage is treated by the aerobic tanks, enabling the sewage to enter a sludge sedimentation tank, completing solid-liquid separation of the mixed solution of the mixed reaction, and enabling the liquid to flow back to the anoxic tank through a back flowing device; and 4) carrying out mixing reaction on 70% of inflow water in the anoxic tank and liquid flowing back by the sludge sedimentation tank, and converting nitrate flowing back and brought from the aerobic tanks into nitrogen for overflowing through the action of denitrifying bacteria under an anoxic condition.

Description

technical field [0001] The invention belongs to the invention and relates to a sewage treatment method and equipment, in particular to a sewage treatment equipment and method for removing total nitrogen without an external carbon source, so that the quality of the effluent meets Class IV of the Environmental Quality Standard for Surface Water (GB3838-2002) (TN≤10) standard. Background technique [0002] In nature, nitrogen exists in two forms, inorganic nitrogen and organic nitrogen. Including inorganic nitrogen such as nitrate and nitrite and organic nitrogen such as protein and amino acid. The definition of total nitrogen in water is the sum of the content of inorganic nitrogen and organic nitrogen in water. [0003] The denitrification technology of sewage can generally be divided into physical chemical denitrification and biological denitrification. Among them, the method commonly used by sewage treatment plants in high-speed service areas to remove total nitrogen is ...

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Problems solved by technology

[0005] In order to solve the problems of high cost of sewage treatment equipment, insufficient carbon source in the treatment process, unstable denitrification effect and high cost of adding external carbon source, the present invention discloses a sewage treatment equipment and Method, the technical scheme that the present invention adopts is:

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