Small short-cut nitrification and denitrification device for treating livestock and poultry breeding wastewater and method

Abstract

The invention discloses a small short-cut nitrification and denitrification device for treating livestock and poultry breeding wastewater and a method. The method comprises the following steps: (1) the livestock and poultry breeding wastewater is pretreated during domestication, so that CODcr is lower than 2000 mg / L, and carbon to nitrogen ratio is not higher than 6.8; (2) domestication comprisesthree stages in sequence, in the first stage, dissolved oxygen is controlled at 2 mg / L during aeration, and aeration is performed for 8 hours and operates for 30 days; in the second stage, dissolved oxygen is adjusted at 1 mg / L, aeration is performed for 6 hours, mud is discharged once after operation for 30 days, and operation continues for another 30 days; (3) domestication and official operation are conducted at room temperature, during formal operation, aeration time can be automatically controlled according to change characteristics of dissolved oxygen, that is, when the dissolved oxygenjump point is monitored, aeration is stopped, and the aerobic nitrification procedure is terminated; and hypoxic agitation time can be automatically controlled according to pH change characteristics.With the operation method, biological treatment efficiency of nitrogen in the livestock and poultry breeding wastewater can be effectively improved, rapid start of short-cut nitrification of the livestock and poultry breeding wastewater at normal temperature is realized, and energy consumption caused by aeration and heating in other short-cut nitrification and denitrification processes is reduced.

Description

technical field [0001] The invention belongs to the technical field of livestock and poultry breeding wastewater treatment, and relates to a short-range nitrification and denitrification small-scale device and method for treating livestock and poultry breeding wastewater. Background technique [0002] At present, almost all the nitrogen transfer pathways in the sewage treatment system of engineering application are full nitrification and denitrification, and the short-cut nitrification and denitrification process reduces the oxidation step of nitrite to nitrate compared with the whole nitrification and denitrification process, so that Nitrite is accumulated and directly denitrified, which can greatly reduce energy consumption such as aeration and additional carbon sources. However, due to the harsh conditions of the short-cut nitrification and denitrification reaction, the engineering application is not mature. Scholars in my country have also started research on this new p...

AI Technical Summary

Problems solved by technology

[0003] At present, it is generally believed that at a temperature of about 30 °C, nitrosative bacteria (AOB) are more likely to become the dominant species, thereby realizing the accumulation of nitrite, but it is unrealistic to heat a large amount of livestock and poultry wastewater in practical applications

In addition, low energy consumption is the biggest advantage of the short-cut nitrification and denitrification process compared to the existing traditional full-range nitrification and denitrification process. However, as the demand for dissolved oxygen decreases, the aeration method still adopts the conventional deep aeration with the aeration head placed at the bottom of the water. , did not maximize the advantage of low energy consumption

Images