Control method of short-path nitrification-anammox integrated denitrification process

Abstract

The control methods of the short-cut nitrification-anammox integrated SBR denitrification process are respectively the dissolved oxygen-ammonia nitrogen control method and the pH-ammonia nitrogen control method; among them: the dissolved oxygen-ammonia nitrogen control method is to use the dissolved oxygen online electrode and the ammonia nitrogen online electrode , the aeration rate is controlled by the dissolved oxygen online electrode, and then the NO2-N concentration level in the SBR is controlled, and the short-range nitrification and anammox reaction are carried out simultaneously in the same SBR, and the ammonia nitrogen retention concentration in the SBR is controlled by the ammonia nitrogen online electrode; The pH-ammonia nitrogen control method is to use the pH online electrode and the ammonia nitrogen online electrode to control the stop of the aeration system through the decrease of pH in the nitrification stage ΔpH1, and to control the opening of the aeration system through the increase of pH in the anammox stage ΔpH2 to realize ammonia nitrogen. The short-range nitrification and anaerobic ammonium oxidation reactions in the same SBR are carried out alternately, and the ammonia nitrogen retention concentration in the SBR is controlled by the ammonia nitrogen online electrode.

Description

technical field [0001] The invention belongs to the field of novel biological denitrification, and in particular relates to two control methods of dissolved oxygen-ammonia nitrogen and pH-ammonia nitrogen in a short-range nitrification-anammox integrated SBR (sequencing batch reactor) denitrification process. Background technique [0002] With the development of society and the improvement of residents' living standards, the main problem facing my country's water environment has changed from the traditional oxygen-consuming pollution to eutrophication. Since ammonia nitrogen is a substance that consumes oxygen and causes eutrophication of water bodies, Therefore, ammonia nitrogen plays an important role in the transformation of the causes of water pollution in my country. Based on this, my country's "Twelfth Five-Year Plan" clearly added the emission reduction indicators of ammonia nitrogen binding water pollutants, so how to reduce ammonia nitrogen emissions is an important ...

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Problems solved by technology

However, the current sewage treatment facilities maintain a fixed hydraulic retention time (HRT) in the actual operation process. In this way, when the ammonia nitrogen load in the influent fluctuates, the ammonia nitrogen concentration in the effluent water will also be affected, and a certain residual ammonia nitrogen cannot be guaranteed. Therefore, it is possible NO will appear 2 - -N accumulation

Especially when the treatment object is industrial wastewater with high ammonia nitrogen concentration, the ammonia nitrogen load will fluctuate violently, which will bring serious impact load, and make the normal operation of the system face the danger of collapse.

[0008] In addition to municipal sludge water (sludge digestion supernatant, digested sludge mechanical dehydration filtrate), the sources of high-concentration ammonia nitrogen wastewater mainly include production wastewater from industrial industries such as fertilizer production, pharmaceuticals, petrochemicals, and coking. The water quality fluctuates violently , so there is no perfect control method to ensure the flexible application of short-cut nitrification-anammox combination process to the above-mentioned industries. Therefore, it is necessary to propose a new control mode that can adapt to the objective conditions of severe fluctuations in water quality

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