Control method for partial nitrification-anaerobic ammonia oxidation integrated denitrification process

Abstract

The invention discloses a control method for a partial nitrification-anaerobic ammonia oxidation integrated SBR (Sequencing Batch Reactor) denitrification process. The method consists of a dissolved oxygen-ammonia nitrogen control method and a pH-ammonia nitrogen control method respectively, wherein the dissolved oxygen-ammonia nitrogen control method comprises the steps that a dissolved oxygen on-line electrode and an ammonia nitrogen on-line electrode are utilized, the aeration rate is controlled through the dissolved oxygen on-line electrode, furthermore the concentration level of NO2-N in an SBR is controlled so as to synchronously carry out the partial nitrification and the anaerobic ammonia oxidation reaction in one same SBR, and the ammonia nitrogen residual concentration in the SBR is controlled through the ammonia nitrogen on-line electrode; and the pH-ammonia nitrogen control method comprises the steps that a pH on-line electrode and the ammonia nitrogen on-line electrode are utilized, an aeration system is controlled to stop through the decreasing amplitude delta pH1 of the pH at the nitration period, the aeration system is controlled to start through the increasing amplitude delta pH2 of the pH in the anaerobic ammonia oxidation period, the partial nitrification and the anaerobic ammonia oxidation reaction are carried out in one same SBR alternatively, and the ammonia nitrogen residual concentration in the SBR is controlled through the ammonia nitrogen on-line 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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