Method for adjusting biological nitrogen and phosphorus removal by using concentration gradient

Abstract

The invention provides a method for adjusting biological nitrogen and phosphorus removal by using a concentration gradient. The method comprises the following steps: (1) detecting concentrations of parameters at different positions in an anaerobic tank, an anoxic tank and an aerobic tank along a water flow direction; (2) comparing the detected concentration with a corresponding theoretical concentration gradient trend, and adjusting parameters which do not accord with the corresponding theoretical concentration gradient trend; and (3) after the operation is adjusted, repeatedly detecting the key parameters which do not accord with the corresponding theoretical concentration gradient trend. According to the method for adjusting biological nitrogen and phosphorus removal by using the concentration gradient, numerical values obtained according to certain parameters detected at different positions in an anaerobic tank, an anoxic tank and an aerobic tank in a biological nitrogen and phosphorus removal process are combined with an actual operation effect; therefore, biological nitrogen and phosphorus removal is guided and accurately adjusted to ensure that the total nitrogen, total phosphorus and ammonia nitrogen of effluent stably reach the standard, and meanwhile, the dosage of a carbon source, the dosage of a chemical phosphorus removal agent and the air volume of a fan are adjusted to achieve the effects of saving energy and reducing consumption.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for adjusting biological denitrification and dephosphorization by using a concentration gradient. Background technique [0002] The biochemical system is mainly used in sewage treatment to remove COD and biological nitrogen and phosphorus removal. Biological denitrification is mainly to change ammonia nitrogen into nitrate nitrogen or special short-range nitrification reaction into nitrite nitrogen in the aerobic tank through nitrification reaction, and then use the internal reflux pump to remove the nitrate nitrogen or nitrite nitrogen in the aerobic tank Return to the anoxic tank to generate nitrogen through denitrification reaction to achieve the removal of total nitrogen. The biological phosphorus removal is mainly the process of biological phosphorus release by using easily biochemical COD in the anaerobic tank, and then the biological phosphorus absorpt...

AI Technical Summary

Problems solved by technology

However, at present, when sewage plants detect DO in anoxic pools or aerobic pools, they generally only detect at a fixed position; at the same time, when detecting parameter concentrations, they generally only detect water in anaerobic pools, anoxic pools, and aerobic pools. The concentration of some parameters can be detected at the terminal, so the obtained data cannot comprehensively and accurately reflect the specific operation status of each process section, so that it is impossible to accurately adjust the biological nitrogen and phosphorus removal and realize energy saving and consumption reduction

In the prior art, the mode of sampling at a single position of a process section and controlling a single parameter is used. At the same time, only one parameter of nitrate nitrogen concentration is used to control the reflux ratio and biological denitrification. This control mode has great risks, because The total nitrogen concentration in the effluent of the anoxic pool may be due to insufficient carbon sources in the anoxic pool, so that the denitrification only stays at the stage of nitrite nitrogen instead of the stage of nitrogen, so that even if the concentration of nitrate nitrogen at the outlet of the anoxic pond is very low, it is sub- The nitrate nitrogen concentration is still high, making the total nitrogen concentration higher than the total nitrogen effluent discharge standard, resulting in the risk of effluent total nitrogen exceeding the standard

At present, there is no method to adjust the biological nitrogen and phosphorus removal by detecting the concentration of multiple parameters at different positions in the anaerobic pond, anoxic pond and aerobic pond; and the sewage plant also urgently needs a more effective and perfect method to adjust Biological nitrogen and phosphorus removal